微信支付Java後臺

1.微信配置資訊 global.properties

2.方法wxpay用於生成預支付訂單資訊

        方法notifyWeiXinPay用於微信支付成功後的回撥, 注意: 在手機端使用微信支付成功後，微信伺服器會根據提供的回撥地址進行回撥, parameterMap.put("notify_url", wxnotify); (見下面程式碼) 

        在區域網是無法進行回撥的，必須將你的服務端放在公網上進行測試， 回撥函式會被多次呼叫，如果第一次成功後，你可以將業務資料狀態標誌為已處理, 對於相同訂單的其它回撥就不需要再次處理了;

package com.main.controller;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.math.BigDecimal;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.jdom.JDOMException;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import com.main.model.WeiXinPrePay;
import com.main.util.ConfigManager;
import com.main.util.DateUtil;
import com.main.util.GeneralConstant;
import com.main.util.PayCommonUtil;
import com.main.util.Result;
import com.main.util.StringUtil;

@Controller
@RequestMapping("/pay")
public class PayController {
	
	
    String randomString = PayCommonUtil.getRandomString(32);
    //支付成功後的回撥函式
    public static String wxnotify = "http://com.zhuohuicalss/pay/notifyWeiXinPay";
	
	public PayController() {
		System.out.println("MainController建構函式");
	}
	
	
	/**
     * @param totalAmount    支付金額
     * @param description    描述
     * @param request
     * @return
     */
    @RequestMapping(value = "/wxpay", produces = MediaType.APPLICATION_JSON_VALUE)
    @ResponseBody    
    public Result wxpay(HttpServletRequest request) {
    	Result result = new Result();
        Long userId = new Long(1);//baseController.getUserId();
       
        BigDecimal totalAmount = new BigDecimal(request.getParameter("totalPrice"));
        String trade_no = "";
        String description="";
		try {
			trade_no = new String(request.getParameter("orderNum").getBytes("ISO-8859-1"),"UTF-8");
			description = request.getParameter("description");
		} catch (UnsupportedEncodingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
        String openId = "";
        
        Map<String, String> map = weixinPrePay(trade_no,totalAmount,description,openId,request);  
        SortedMap<String, Object> finalpackage = new TreeMap<String, Object>();
        //應用ID
        finalpackage.put("appid", ConfigManager.getInstance().getConfigItem("WXAppID")/*PayCommonUtil.APPID*/);
        //商戶號
        finalpackage.put("partnerid", ConfigManager.getInstance().getConfigItem("MCH_ID"));
        Long time = (System.currentTimeMillis() / 1000);
        //時間戳
        finalpackage.put("timestamp", time.toString());
        //隨機字串
        finalpackage.put("noncestr", map.get("nonce_str"));
        //預支付交易會話ID
        finalpackage.put("prepayid", map.get("prepay_id"));
        //擴充套件欄位
        finalpackage.put("package", "Sign=WXPay");
        
        WeiXinPrePay prePay = new WeiXinPrePay();
        prePay.setAppId(ConfigManager.getInstance().getConfigItem("WXAppID"));
        prePay.setMchId(ConfigManager.getInstance().getConfigItem("MCH_ID"));
        prePay.setTimeStamp(time.toString());
        prePay.setNonceStr(map.get("nonce_str"));
        prePay.setPrepayId(map.get("prepay_id"));
        prePay.setSignType("MD5");
        prePay.setPaySign(sign);
        result.setData(prePay);
        result.setStateCode(GeneralConstant.SUCCESS);
        result.setDesc("微信支付載入成功");
        
        return result;
    } 

	
	/**
     * 統一下單 
     * 應用場景：商戶系統先呼叫該介面在微信支付服務後臺生成預支付交易單，返回正確的預支付交易回話標識後再在APP裡面調起支付。
     * @param trade_no
     * @param totalAmount
     * @param description
     * @param openid
     * @param sym
     * @param request
     * @return
     */
    @SuppressWarnings("unchecked")
    public Map<String, String> weixinPrePay(String trade_no,BigDecimal totalAmount,  
            String description, String openid, HttpServletRequest request) { 
        SortedMap<String, Object> parameterMap = new TreeMap<String, Object>();  
        parameterMap.put("appid", ConfigManager.getInstance().getConfigItem("WXAppID"));  //應用appid 
        parameterMap.put("mch_id", ConfigManager.getInstance().getConfigItem("MCH_ID")/*PayCommonUtil.MCH_ID*/);  //商戶號
        //parameterMap.put("device_info", "WEB");
        parameterMap.put("nonce_str", randomString);  
        parameterMap.put("body", description);
        parameterMap.put("out_trade_no", trade_no);
        parameterMap.put("fee_type", "CNY");  
        System.out.println("jiner");  
        BigDecimal total = totalAmount.multiply(new BigDecimal(100));  //介面中引數支付金額單位為【分】，引數值不能帶小數，所以乘以100
        java.text.DecimalFormat df=new java.text.DecimalFormat("0");  
        parameterMap.put("total_fee", df.format(total));  
        System.out.println("jiner2");  
        parameterMap.put("spbill_create_ip", PayCommonUtil.getRemoteHost(request));  
        parameterMap.put("notify_url", wxnotify);
        parameterMap.put("trade_type", "APP");//"JSAPI"
        //trade_type為JSAPI是 openid為必填項
        //parameterMap.put("openid", openid);
        System.out.println("");  
        String sign = PayCommonUtil.createSign("UTF-8", parameterMap); 
        System.out.println("jiner2");  
        parameterMap.put("sign", sign);  
        String requestXML = PayCommonUtil.getRequestXml(parameterMap);  
        System.out.println(requestXML);  
        String result = PayCommonUtil.httpsRequest(  
                "https://api.mch.weixin.qq.com/pay/unifiedorder", "POST",  
                requestXML);  
        System.out.println(result);  
        Map<String, String> map = null;  
        try {  
            map = PayCommonUtil.doXMLParse(result);  
        } catch (JDOMException e) {  
            // TODO Auto-generated catch block  
            e.printStackTrace();  
        } catch (IOException e) {  
            // TODO Auto-generated catch block  
            e.printStackTrace();  
        }  
        return map;        
    }
    
    

    /**
     * 此函式會被執行多次，如果支付狀態已經修改為已支付，則下次再調的時候判斷是否已經支付，如果已經支付了，則什麼也執行
     * @param request
     * @param response
     * @return
     * @throws IOException
     * @throws JDOMException
     */
    @RequestMapping(value = "notifyWeiXinPay", produces = MediaType.APPLICATION_JSON_VALUE)
   // @RequestDescription("支付回撥地址")
    @ResponseBody
    public String notifyWeiXinPay(HttpServletRequest request, HttpServletResponse response) throws IOException, JDOMException {
        System.out.println("微信支付回撥");
        InputStream inStream = request.getInputStream();
        ByteArrayOutputStream outSteam = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int len = 0;
        while ((len = inStream.read(buffer)) != -1) {
            outSteam.write(buffer, 0, len);
        }
        String resultxml = new String(outSteam.toByteArray(), "utf-8");
        Map<String, String> params = PayCommonUtil.doXMLParse(resultxml);
        outSteam.close();
        inStream.close();
        
        
        Map<String,String> return_data = new HashMap<String,String>();  
        if (!PayCommonUtil.isTenpaySign(params)) {
            // 支付失敗
        	return_data.put("return_code", "FAIL");  
            return_data.put("return_msg", "return_code不正確");
        	return StringUtil.GetMapToXML(return_data);
        } else {
            System.out.println("===============付款成功==============");
            // ------------------------------
            // 處理業務開始
            // ------------------------------
            // 此處處理訂單狀態，結合自己的訂單資料完成訂單狀態的更新
            // ------------------------------

            String total_fee = params.get("total_fee");
            double v = Double.valueOf(total_fee) / 100;
            String out_trade_no = String.valueOf(Long.parseLong(params.get("out_trade_no").split("O")[0]));
			Date accountTime = DateUtil.stringtoDate(params.get("time_end"), "yyyyMMddHHmmss");
			String ordertime = DateUtil.dateToString(new Date(), "yyyy-MM-dd HH:mm:ss");
			String totalAmount = String.valueOf(v);
			String appId = params.get("appid");
			String tradeNo = params.get("transaction_id");
		
			return_data.put("return_code", "SUCCESS");  
            return_data.put("return_msg", "OK");  
			return StringUtil.GetMapToXML(return_data);
        }
    }

}
 

3.用到的一些工具類

import java.io.InputStream;
import java.util.*;

/**
 * 讀取配置檔案的類 單例類
 * @author Administrator
 *
 */
public class ConfigManager {
	// 屬性檔案命名
	private Properties m_props = null;
	private static  Map<String,String> configMap;
	private static  ConfigManager m_instance = null;
	private static   Properties props = null; 
	private ConfigManager() {
		m_props = new Properties();
		configMap = new HashMap<String,String>();
		try {
			props = System.getProperties(); //獲取系統屬性
			m_props.load(getInputStream());
			getSysConfigMsg();
			
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	public synchronized static ConfigManager getInstance() {
		if(m_instance == null){
			m_instance = new ConfigManager();
		}
		return m_instance;
	}

	public InputStream getInputStream() {
		InputStream is = null;
		try {
			is = getClass().getClassLoader().getResourceAsStream("global.properties");
		} catch (Exception e) {
			e.printStackTrace();
		}
		return is;
	}
    
	public Map<String,String> getSysConfigMsg(){
		Set<Object> keyset = m_props.keySet();
		Iterator<Object> it = keyset.iterator();
		while(it.hasNext()){
			String nextkey = it.next().toString();
			configMap.put(nextkey,getConfigItem(nextkey));
		}
		return configMap;
	}
	
	public String getConfigItem(String name) {
		String val = m_props.getProperty(name).trim();
		if("fileSavePath".equals(name)){
			if(props.getProperty("os.name").startsWith("Windows")){
				val  =  val.split("#")[0].toString().trim();
			}else{
				val  =  val.split("#")[1].toString().trim();
			}
		}
		
		return val;
		
	}
	public Map<String,String> getConfigMap(){
		return configMap;
	}

}
 

import java.text.DateFormat;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.regex.Pattern;


public class DateUtil {

	// 格式：年－月－日 小時：分鐘：秒
    public static final String FORMAT_ONE = "yyyy-MM-dd HH:mm:ss";

    // 格式：年－月－日 小時：分鐘
    public static final String FORMAT_TWO = "yyyy-MM-dd HH:mm";

    // 格式：年月日 小時分鐘秒
    public static final String FORMAT_THREE = "yyyyMMdd-HHmmss";
    
    // 格式：年月日
    public static final String FORMAT_FOUR = "yyyyMMdd";
    
    // 格式：年－月－日
    public static final String LONG_DATE_FORMAT = "yyyy-MM-dd";

    // 格式：月－日
    public static final String SHORT_DATE_FORMAT = "MM-dd";

    // 格式：小時：分鐘：秒
    public static final String LONG_TIME_FORMAT = "HH:mm:ss";

    //格式：年-月
    public static final String MONTG_DATE_FORMAT = "yyyy-MM";

    // 年的加減
    public static final int SUB_YEAR = Calendar.YEAR;

    // 月加減
    public static final int SUB_MONTH = Calendar.MONTH;

    // 天的加減
    public static final int SUB_DAY = Calendar.DATE;

    // 小時的加減
    public static final int SUB_HOUR = Calendar.HOUR;

    // 分鐘的加減
    public static final int SUB_MINUTE = Calendar.MINUTE;

    // 秒的加減
    public static final int SUB_SECOND = Calendar.SECOND;

    static final String dayNames[] = { "星期日", "星期一", "星期二", "星期三", "星期四",
            "星期五", "星期六" };

    public DateUtil() {
    }

    /**
     * 把符合日期格式的字串轉換為日期型別
     */
    public static Date stringtoDate(String dateStr, String format) {
        Date d = null;
        SimpleDateFormat formater = new SimpleDateFormat(format);
        try {
            formater.setLenient(false);
            d = formater.parse(dateStr);
        } catch (Exception e) {
            // log.error(e);
            d = null;
        }
        return d;
    }
    
    /**
     * 把符合日期格式的字串轉換為日期型別
     */
    public static Date stringtoDate(String dateStr, String format,
            ParsePosition pos) {
        Date d = null;
        SimpleDateFormat formater = new SimpleDateFormat(format);
        try {
            formater.setLenient(false);
            d = formater.parse(dateStr, pos);
        } catch (Exception e) {
            d = null;
        }
        return d;
    }

    /**
     * 把日期轉換為字串
     */
    public static String dateToString(Date date, String format) {
        String result = "";
        SimpleDateFormat formater = new SimpleDateFormat(format);
        try {
            result = formater.format(date);
        } catch (Exception e) {
            // log.error(e);
        }
        return result;
    }

    /**
     * 獲取當前時間的指定格式
     */
    public static String getCurrDate(String format) {
        return dateToString(new Date(), format);
    }

    /**
     * 
     * @Title:        dateSub
     * @Date          2014-1-9 上午10:44:02
     * @Description:  得到指定日期前(後)的日期
     * @param:        @param dateKind  例：Calendar.DAY_OF_MONTH
     * @param:        @param dateStr  指定日期
     * @param:        @param amount   增加(減去)的時間量
     * @param:        @return   
     * @return:       String   
     * @throws
     * @author        mtf
     */
    public static String dateSub(int dateKind, String dateStr, int amount) {
        Date date = stringtoDate(dateStr, MONTG_DATE_FORMAT);
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(dateKind, amount);
        return dateToString(calendar.getTime(), FORMAT_ONE);
    }

    /**
     * 昨日日期
     * @return
     */
    public static String yearthDate(String dateStr){
    	Date date = stringtoDate(dateStr, LONG_DATE_FORMAT);//取時間 
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date); 
        calendar.add(calendar.DATE,-1);//把日期往後增加一天.整數往後推,負數往前移動 
        //date=calendar.getTime();   //這個時間就是日期往後推一天的結果 
        return dateToString(calendar.getTime(), LONG_DATE_FORMAT);
    }
    
    /**
     * 兩個日期相減
     * @return 相減得到的秒數
     */
    public static long timeSub(String firstTime, String secTime) {
        long first = stringtoDate(firstTime, FORMAT_ONE).getTime();
        long second = stringtoDate(secTime, FORMAT_ONE).getTime();
        return (second - first) / 1000;
    }
    /**
     * 兩個日期相減
     * 引數地DATE
     * second 兩個日期相差的秒
     * @return 相減得到的秒數 
     * 後面時間減去前面時間  再減去 相差秒數    如果大於0 返回 FASLE
     */
    public static boolean timeSub(Date firstTime, Date secTime,long  secs) {
        long first = firstTime.getTime();
        long second = secTime.getTime();
        // 判斷兩個時間 是否間隔那麼長 secs。
        return (second - first - secs) > 0 ? false:true;
    }
    /**
     * 兩個日期相減
     * 引數地DATE
     * @return 相減得到的秒數 
     * 後面時間減去前面時間  如果大於0 返回 false
     */
    public static boolean timeSub(Date firstTime, Date secTime) {
        long first = firstTime.getTime();
        long second = secTime.getTime();
        return (second - first)>0?false:true;
    }
    /**
     * 獲得某月的天數
     */
    public static int getDaysOfMonth(String year, String month) {
        int days = 0;
        if (month.equals("1") || month.equals("3") || month.equals("5")
                || month.equals("7") || month.equals("8") || month.equals("10")
                || month.equals("12")) {
            days = 31;
        } else if (month.equals("4") || month.equals("6") || month.equals("9")
                || month.equals("11")) {
            days = 30;
        } else {
            if ((Integer.parseInt(year) % 4 == 0 && Integer.parseInt(year) % 100 != 0)
                    || Integer.parseInt(year) % 400 == 0) {
                days = 29;
            } else {
                days = 28;
            }
        }

        return days;
    }

    /**
     * 獲取某年某月的天數
     */
    public static int getDaysOfMonth(int year, int month) {
        Calendar calendar = Calendar.getInstance();
        calendar.set(year, month - 1, 1);
        return calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
    }

    /**
     * 獲得當前日期
     */
    public static int getToday() {
        Calendar calendar = Calendar.getInstance();
        return calendar.get(Calendar.DATE);
    }

    /**
     * 獲得當前月份
     */
    public static int getToMonth() {
        Calendar calendar = Calendar.getInstance();
        return calendar.get(Calendar.MONTH) + 1;
    }

    /**
     * 獲得當前年份
     */
    public static int getToYear() {
        Calendar calendar = Calendar.getInstance();
        return calendar.get(Calendar.YEAR);
    }

    /**
     * 返回日期的天
     */
    public static int getDay(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        return calendar.get(Calendar.DATE);
    }
    
    /**
     * 返回日期的年
     */
    public static int getYear(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        return calendar.get(Calendar.YEAR);
    }

    /**
     * 返回日期的月份，1-12
     */
    public static int getMonth(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        return calendar.get(Calendar.MONTH) + 1;
    }

    /**
     * 計算兩個日期相差的天數，如果date2 > date1 返回正數，否則返回負數
     */
    public static long dayDiff(Date date1, Date date2) {
        return (date2.getTime() - date1.getTime()) / 86400000;
    }

    /**
     * 比較兩個日期的年差
     */
    public static int yearDiff(String before, String after) {
        Date beforeDay = stringtoDate(before, LONG_DATE_FORMAT);
        Date afterDay = stringtoDate(after, LONG_DATE_FORMAT);
        return getYear(afterDay) - getYear(beforeDay);
    }

    /**
     * 比較指定日期與當前日期的差
     */
    public static int yearDiffCurr(String after) {
        Date beforeDay = new Date();
        Date afterDay = stringtoDate(after, LONG_DATE_FORMAT);
        return getYear(beforeDay) - getYear(afterDay);
    }

    /**
     * 獲取每月的第一週
     */
    public static int getFirstWeekdayOfMonth(int year, int month) {
        Calendar c = Calendar.getInstance();
        c.setFirstDayOfWeek(Calendar.SATURDAY); // 星期天為第一天
        c.set(year, month - 1, 1);
        return c.get(Calendar.DAY_OF_WEEK);
    }
    
    /**
     * 獲取每月的最後一週
     */
    public static int getLastWeekdayOfMonth(int year, int month) {
        Calendar c = Calendar.getInstance();
        c.setFirstDayOfWeek(Calendar.SATURDAY); // 星期天為第一天
        c.set(year, month - 1, getDaysOfMonth(year, month));
        return c.get(Calendar.DAY_OF_WEEK);
    }

    /**
     * 獲得當前日期字串，格式"yyyy-MM-dd HH:mm:ss"
     * 
     * @return
     */
    public static String getNow() {
        Calendar today = Calendar.getInstance();
        return dateToString(today.getTime(), FORMAT_ONE);
    }

   

    /**
     * 判斷日期是否有效,包括閏年的情況
     * 
     * @param date
     *          YYYY-mm-dd
     * @return
     */
    public static boolean isDate(String date) {
        StringBuffer reg = new StringBuffer(
                "^((\\d{2}(([02468][048])|([13579][26]))-?((((0?");
        reg.append("[13578])|(1[02]))-?((0?[1-9])|([1-2][0-9])|(3[01])))");
        reg.append("|(((0?[469])|(11))-?((0?[1-9])|([1-2][0-9])|(30)))|");
        reg.append("(0?2-?((0?[1-9])|([1-2][0-9])))))|(\\d{2}(([02468][12");
        reg.append("35679])|([13579][01345789]))-?((((0?[13578])|(1[02]))");
        reg.append("-?((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))");
        reg.append("-?((0?[1-9])|([1-2][0-9])|(30)))|(0?2-?((0?[");
        reg.append("1-9])|(1[0-9])|(2[0-8]))))))");
        Pattern p = Pattern.compile(reg.toString());
        return p.matcher(date).matches();
    }
    
    
    /*****
     * 時間 增加、減少 n個小時以後時間
     * @param date
     *          YYYY-mm-dd HH:mm:ss
     * @param num>0  小時         
     * @param type  增加和減少標誌  
     * **/
    public static Date adjustDateByHour(Date d ,Integer num, int  type) {
    	Calendar Cal= Calendar.getInstance();
   	 	DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");  
	    Cal.setTime(d);  
    	if(type==0){
    	    Cal.add(Calendar.MINUTE,-num);
    	   // System.out.println("date:"+df.format(Cal.getTime()));
    		
    	}else
    	{
    		Cal.add(Calendar.MINUTE,num);
    	    //System.out.println("date:"+df.format(Cal.getTime()));
    	}
    	return Cal.getTime();
    }
    /*****
     * 時間 增加、減少 n個分鐘以後時間
     * @param date
     *          YYYY-mm-dd HH:mm:ss
     * @param num>0  分鐘       
     * @param type  增加和減少標誌  
     * **/
    public static Date adjustDateByMinutes(Date d ,Integer num, int  type) {
    	Calendar Cal= Calendar.getInstance();
   	 	DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");  
	    Cal.setTime(d);  
    	if(type==0){
    	    Cal.add(Calendar.MINUTE,-num);
    	  //  System.out.println("date:"+df.format(Cal.getTime()));
    		
    	}else
    	{
    		Cal.add(Calendar.MINUTE,num);
    	 //   System.out.println("date:"+df.format(Cal.getTime()));
    	}
    	return Cal.getTime();
    }
    
    public static void main(String[] args){
//    	String dateStr = DateUtil.yearthDate("2017-05-30");
//    	System.out.println(dateStr);
//    	long min = DateUtil.timeSub("2017-04-12 00:00:00", "2017-04-13 00:00:00")/60;
//    	System.out.println(min);
    	String settlementDate = DateUtil.dateToString(new Date(), "yyyy-MM-dd");
    	long day = DateUtil.dayDiff(DateUtil.stringtoDate("2017-06-22", "yyyy-MM-dd"),DateUtil.stringtoDate(settlementDate, "yyyy-MM-dd"));
    	if(day >= 0){
    		System.out.println(day);
    	}
    	
    	String goodsArriveTime = "2017-04-02 17:00-18:00";
    	int space_index = goodsArriveTime.indexOf(" ");
    	String arrive_date = goodsArriveTime.substring(0, space_index);
		String arrive_time = goodsArriveTime.substring(space_index+1, goodsArriveTime.length());
		
		System.out.println(arrive_date);
		System.out.println(arrive_time);
		String arrive_start_time = arrive_time.substring(0, 2);
		String arrive_end_time = arrive_time.substring(6,8);
    	
		System.out.println(arrive_start_time);
		System.out.println(arrive_end_time);
		
		String Time = DateUtil.getCurrDate("HH");
		System.out.println(Time);
		
		String Time2 = DateUtil.getCurrDate("mm");
		System.out.println(Time2);
    }
    
}
 

import java.security.MessageDigest;

public class MD5Util {
	private static String byteArrayToHexString(byte b[]) {
        StringBuffer resultSb = new StringBuffer();
        for (int i = 0; i < b.length; i++)
            resultSb.append(byteToHexString(b[i]));

        return resultSb.toString();
    }

    private static String byteToHexString(byte b) {
        int n = b;
        if (n < 0)
            n += 256;
        int d1 = n / 16;
        int d2 = n % 16;
        return hexDigits[d1] + hexDigits[d2];
    }

    public static String MD5Encode(String origin, String charsetname) {
        String resultString = null;
        try {
            resultString = new String(origin);
            MessageDigest md = MessageDigest.getInstance("MD5");
            if (charsetname == null || "".equals(charsetname))
                resultString = byteArrayToHexString(md.digest(resultString
                        .getBytes()));
            else
                resultString = byteArrayToHexString(md.digest(resultString
                        .getBytes(charsetname)));
        } catch (Exception exception) {
        }
        return resultString;
    }

    private static final String hexDigits[] = { "0", "1", "2", "3", "4", "5",
            "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };

}

import org.apache.http.Consts;
import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.ssl.SSLContexts;
import org.apache.http.util.EntityUtils;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;

import javax.net.ssl.SSLContext;
import javax.servlet.http.HttpServletRequest;
import java.io.*;
import java.net.ConnectException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.security.KeyStore;
import java.util.*;

public class PayCommonUtil {
	 //微信引數配置  
    public static String API_KEY = ConfigManager.getInstance().getConfigItem("API_KEY");
     
    //隨機字串生成  
    public static String getRandomString(int length) { //length表示生成字串的長度      
         String base = "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";         
         Random random = new Random();         
         StringBuffer sb = new StringBuffer();         
         for (int i = 0; i < length; i++) {         
             int number = random.nextInt(base.length());         
             sb.append(base.charAt(number));         
         }         
         return sb.toString();         
    }    
    
    //請求xml組裝  
    public static String getRequestXml(SortedMap<String,Object> parameters){  
          StringBuffer sb = new StringBuffer();  
          sb.append("<xml>");  
          Set es = parameters.entrySet();  
          Iterator it = es.iterator();  
          while(it.hasNext()) {  
              Map.Entry entry = (Map.Entry)it.next();  
              String key = (String)entry.getKey();  
              String value = (String)entry.getValue();  
              if ("attach".equalsIgnoreCase(key)||"body".equalsIgnoreCase(key)||"sign".equalsIgnoreCase(key)) {  
                  sb.append("<"+key+">"+"<![CDATA["+value+"]]></"+key+">");  
              }else {  
                  sb.append("<"+key+">"+value+"</"+key+">");  
              }  
          }  
          sb.append("</xml>");  
          return sb.toString();  
    } 
    
    //生成簽名  
    public static String createSign(String characterEncoding,SortedMap<String,Object> parameters){  
          StringBuffer sb = new StringBuffer();  
          Set es = parameters.entrySet();  
          Iterator it = es.iterator();  
          while(it.hasNext()) {  
              Map.Entry entry = (Map.Entry)it.next();  
              String k = (String)entry.getKey();  
              Object v = entry.getValue();  
              if(null != v && !"".equals(v)  
                      && !"sign".equals(k) && !"key".equals(k)) {  
                  sb.append(k + "=" + v + "&");  
              }  
          }  
          sb.append("key=" + API_KEY);  
          System.out.println(sb.toString());
          String sign = MD5Util.MD5Encode(sb.toString(), characterEncoding).toUpperCase();  
          return sign;  
    }
    
    /**
     * 驗證回撥簽名
     * @return
     */
    public static boolean isTenpaySign(Map<String, String> map) {
    	String characterEncoding="utf-8";
       String charset = "utf-8";
       String signFromAPIResponse = map.get("sign");
       if (signFromAPIResponse == null || signFromAPIResponse.equals("")) {
    	   System.out.println("API返回的資料簽名資料不存在，有可能被第三方篡改!!!"); 
    	   return false;
       }
       System.out.println("伺服器回包裡面的簽名是:" + signFromAPIResponse);
     //過濾空 設定 TreeMap
       SortedMap<String,String> packageParams = new TreeMap();
       
       for (String parameter : map.keySet()) {
    	   String parameterValue = map.get(parameter);
    	   String v = "";
    	   if (null != parameterValue) {
    		   v = parameterValue.trim();
    	   }
    	   packageParams.put(parameter, v);
       }
       
       StringBuffer sb = new StringBuffer();
       Set es = packageParams.entrySet();
       Iterator it = es.iterator();
       
       while(it.hasNext()) {
    	   Map.Entry entry = (Map.Entry)it.next();
    	   String k = (String)entry.getKey();
    	   String v = (String)entry.getValue();
    	   if(!"sign".equals(k) && null != v && !"".equals(v)) {
    		   sb.append(k + "=" + v + "&");
    	   }
       }
       sb.append("key=" + API_KEY);
       
     //將API返回的資料根據用簽名演算法進行計算新的簽名，用來跟API返回的簽名進行比較
     //算出簽名
       String resultSign = "";
       String tobesign = sb.toString();
       
       if (null == charset || "".equals(charset)) {
    	   resultSign = MD5Util.MD5Encode(tobesign, characterEncoding).toUpperCase();
       }else{
    	   try{
    		   resultSign = MD5Util.MD5Encode(tobesign, characterEncoding).toUpperCase();
    	   }catch (Exception e) {
    		   resultSign = MD5Util.MD5Encode(tobesign, characterEncoding).toUpperCase();
    	   }
       }
       
       String tenpaySign = ((String)packageParams.get("sign")).toUpperCase();
       return tenpaySign.equals(resultSign);
    }

    //請求方法  
    public static String httpsRequest(String requestUrl, String requestMethod, String outputStr) {  
          try {  
               
              URL url = new URL(requestUrl);  
              HttpURLConnection conn = (HttpURLConnection) url.openConnection();  
              
              conn.setDoOutput(true);  
              conn.setDoInput(true);  
              conn.setUseCaches(false);  
              // 設定請求方式（GET/POST）  
              conn.setRequestMethod(requestMethod);  
              conn.setRequestProperty("content-type", "application/x-www-form-urlencoded");  
              // 當outputStr不為null時向輸出流寫資料  
              if (null != outputStr) {  
                  OutputStream outputStream = conn.getOutputStream();  
                  // 注意編碼格式  
                  outputStream.write(outputStr.getBytes("UTF-8"));  
                  outputStream.close();  
              }  
              // 從輸入流讀取返回內容  
              InputStream inputStream = conn.getInputStream();  
              InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");  
              BufferedReader bufferedReader = new BufferedReader(inputStreamReader);  
              String str = null;  
              StringBuffer buffer = new StringBuffer();  
              while ((str = bufferedReader.readLine()) != null) {  
                  buffer.append(str);  
              }  
              // 釋放資源  
              bufferedReader.close();  
              inputStreamReader.close();  
              inputStream.close();  
              inputStream = null;  
              conn.disconnect();  
              return buffer.toString();  
          } catch (ConnectException ce) {  
              System.out.println("連線超時：{}"+ ce);  
          } catch (Exception e) {  
              System.out.println("https請求異常：{}"+ e);  
          }  
          return null;  
    }  
      
    //退款的請求方法  
    public static String httpsRequest2(String requestUrl, String requestMethod, String outputStr) throws Exception {  
          KeyStore keyStore  = KeyStore.getInstance("PKCS12");  
          StringBuilder res = new StringBuilder("");  
          FileInputStream instream = new FileInputStream(new File("/home/apiclient_cert.p12"));  
          try {  
              keyStore.load(instream, "".toCharArray());  
          } finally {  
              instream.close();  
          }  

          // Trust own CA and all self-signed certs  
          SSLContext sslcontext = SSLContexts.custom()
                  .loadKeyMaterial(keyStore, "1313329201".toCharArray())  
                  .build();  
          // Allow TLSv1 protocol only  
          SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(
                  sslcontext,  
                  new String[] { "TLSv1" },  
                  null,  
                  SSLConnectionSocketFactory.BROWSER_COMPATIBLE_HOSTNAME_VERIFIER);
          CloseableHttpClient httpclient = HttpClients.custom()
                  .setSSLSocketFactory(sslsf)  
                  .build();  
          try {  

              HttpPost httpost = new HttpPost("https://api.mch.weixin.qq.com/secapi/pay/refund");
              httpost.addHeader("Connection", "keep-alive");  
              httpost.addHeader("Accept", "*/*");  
              httpost.addHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");  
              httpost.addHeader("Host", "api.mch.weixin.qq.com");  
              httpost.addHeader("X-Requested-With", "XMLHttpRequest");  
              httpost.addHeader("Cache-Control", "max-age=0");  
              httpost.addHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0) ");  
               StringEntity entity2 = new StringEntity(outputStr , Consts.UTF_8);
               httpost.setEntity(entity2);  
              System.out.println("executing request" + httpost.getRequestLine());  

              CloseableHttpResponse response = httpclient.execute(httpost);
               
              try {  
                  HttpEntity entity = response.getEntity();
                    
                  System.out.println("----------------------------------------");  
                  System.out.println(response.getStatusLine());  
                  if (entity != null) {  
                      System.out.println("Response content length: " + entity.getContentLength());  
                      BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(entity.getContent()));  
                      String text = "";
                      res.append(text);  
                      while ((text = bufferedReader.readLine()) != null) {  
                          res.append(text);  
                          System.out.println(text);  
                      }  
                       
                  }  
                  EntityUtils.consume(entity);
              } finally {  
                  response.close();  
              }  
          } finally {  
              httpclient.close();  
          }  
          return  res.toString(); 
   }
    
  //xml解析  
    public static Map doXMLParse(String strxml) throws JDOMException, IOException {
          strxml = strxml.replaceFirst("encoding=\".*\"", "encoding=\"UTF-8\"");  

          if(null == strxml || "".equals(strxml)) {  
              return null;  
          }  
            
          Map m = new HashMap();  
            
          InputStream in = new ByteArrayInputStream(strxml.getBytes("UTF-8"));  
          SAXBuilder builder = new SAXBuilder();
          Document doc = builder.build(in);
          Element root = doc.getRootElement();
          List list = root.getChildren();  
          Iterator it = list.iterator();  
          while(it.hasNext()) {  
              Element e = (Element) it.next();
              String k = e.getName();  
              String v = "";  
              List children = e.getChildren();  
              if(children.isEmpty()) {  
                  v = e.getTextNormalize();  
              } else {  
                  v = getChildrenText(children);  
              }  
                
              m.put(k, v);  
          }  
            
          //關閉流  
          in.close();  
            
          return m;  
    }  
    
    public static String getChildrenText(List children) {  
        StringBuffer sb = new StringBuffer();  
        if(!children.isEmpty()) {  
            Iterator it = children.iterator();  
            while(it.hasNext()) {  
                Element e = (Element) it.next();
                String name = e.getName();  
                String value = e.getTextNormalize();  
                List list = e.getChildren();  
                sb.append("<" + name + ">");  
                if(!list.isEmpty()) {  
                    sb.append(getChildrenText(list));  
                }  
                sb.append(value);  
                sb.append("</" + name + ">");  
            }  
        }  
          
        return sb.toString();  
  }
    
    
   public static String getRemoteHost(HttpServletRequest request){
        String ip = request.getHeader("x-forwarded-for");
        if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)){
            ip = request.getHeader("Proxy-Client-IP");
        }
        if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)){
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)){
            ip = request.getRemoteAddr();
        }
        return ip.equals("0:0:0:0:0:0:0:1")?"127.0.0.1":ip;
    }
}

package com.lemonjr.api.utils;

import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class StringUtil {
	
	/**
	 * 數值型別前面補零（共13位）
	 * @param num
	 * @return
	 */
	public static String supplementZeroGenerateThirteen(int num){
		String str = String.format("%013d", num); 
		
		return str;
	}
	
	/**
	 * 數值型別前面補零（共16位）
	 * @param num
	 * @return
	 */
	public static String supplementZeroGenerateSixteen(int num){
		String str = String.format("%016d", num); 
		
		return str;
	}
	/**
	 * 數值型別前面補零（共3位）
	 * @param num
	 * @return
	 */
	public static String supplementZeroGenerateThree(int num){
		String str = String.format("%03d", num); 
		
		return str;
	}
	
	/**
	 * 判斷字串是不是double型
	 * @param str
	 * @return
	 */
	public static boolean isNumeric(String str){ 
		 Pattern pattern = Pattern.compile("[0-9]+[.]{0,1}[0-9]*[dD]{0,1}"); 
		 Matcher isNum = pattern.matcher(str);
	     if( !isNum.matches() ){
		    return false; 
		 } 
		   return true; 
	}
	
	 public static String trim(String str, boolean nullFlag){
  	   String tempStr = null;

         if (str != null)
         {
             tempStr = str.trim();
         }

         if (nullFlag)
         {
             if ("".equals(tempStr) || "null".equals(tempStr))
             {
                 tempStr = null;
             }
         }
         else
         {
             if (tempStr == null)
             {
                 tempStr = "";
             }
         }

         return tempStr;
    }
	 public static String replace(String strSource, String strFrom, String strTo) {
			if(strSource==null){
				return null;
			}
			int i = 0;
			if ((i = strSource.indexOf(strFrom, i)) >= 0) {
				char[] cSrc = strSource.toCharArray();
				char[] cTo = strTo.toCharArray();
				int len = strFrom.length();
				StringBuffer buf = new StringBuffer(cSrc.length);
				buf.append(cSrc, 0, i).append(cTo);
				i += len;
				int j = i;
				while ((i = strSource.indexOf(strFrom, i)) > 0) {
					buf.append(cSrc, j, i - j).append(cTo);
					i += len;
					j = i;
				}
				buf.append(cSrc, j, cSrc.length - j);
				return buf.toString();
			}
			return strSource;
		}

	
	 public static String deal(String str) {
			str = replace(str, "\\", "\\\\");
			str = replace(str, "'", "\\'");
			str = replace(str, "\r", "\\r");
			str = replace(str, "\n", "\\n");
			str = replace(str, "\"", "\\\"");
			return str;
		}
	 
	 public static String GetMapToXML(Map<String,String> param){  
         StringBuffer sb = new StringBuffer();  
         sb.append("<xml>");  
         for (Map.Entry<String,String> entry : param.entrySet()) {   
                sb.append("<"+ entry.getKey() +">");  
                sb.append(entry.getValue());  
                sb.append("</"+ entry.getKey() +">");  
        }    
         sb.append("</xml>");  
         return sb.toString();  
     }  
	 
	public static void main(String[] args){
		//String a = StringUtil.supplementZeroGenerateThirteen(1000);
		double a = 32.;
		System.out.println(StringUtil.isNumeric("32."));
		System.out.println(a);
	}

}

4.用到的jar包

<!--微信 -->
        <dependency>
            <groupId>com.github.liyiorg</groupId>
            <artifactId>weixin-popular</artifactId>
            <version>2.8.5</version>
        </dependency>
<!--httpclient-->
        <dependency>
            <groupId>commons-httpclient</groupId>
            <artifactId>commons-httpclient</artifactId>
            <version>3.1</version>
        </dependency>
        <dependency>
            <groupId>org.jdom</groupId>
            <artifactId>jdom2</artifactId>
            <version>2.0.6</version>
        </dependency>