package com.ninepoint.babystar.server.action;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

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

import net.sf.json.JSONObject;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.log4j.Logger;

import com.ninepoint.babystar.server.bean.ResultBaseBean;
/**
 * 
 * @Description 圖片上傳介面（Servlet實現）支援引數和多張圖片的上傳
 * @author nier_ni
 * @date 2015-9-26 上午11:05:52 
 * @version
 */
public class UploadFileServlet extends HttpServlet {  
	/** @Fields serialVersionUID: */
  	
	private static final long serialVersionUID = -4903483985922185852L;
	private final Logger logger = Logger.getLogger(UploadFileServlet.class);
	 
	public void doGet(HttpServletRequest request, HttpServletResponse response)  
            throws ServletException, IOException {  
		String realPath = this.getServletContext().getRealPath("images");  //圖片儲存路徑
		ResultBaseBean result = new ResultBaseBean();
		result.setResult(0);
        boolean isMultipart = ServletFileUpload.isMultipartContent(request);  
        if(isMultipart){  
        	/**
        	 * 1、上傳是否有資料；
        	 * 2、圖片存放路徑；
        	 * 3、圖片是否儲存成功。 result 1、上傳成功，0、上傳失敗。
        	 */
            String msg = null;
            HashMap<String,String> params = uploadImg(realPath,request);
            responseOutWithJson(response,result);
        }  
    }  
    public void doPost(HttpServletRequest request, HttpServletResponse response)  
    throws ServletException, IOException {  
    	this.doGet(request,response);
    }
    /**
     * 
     * @Description 上傳圖片
     * @param realPath
     * @param request
     */
    public HashMap<String,String> uploadImg(String realPath, HttpServletRequest request){
    	HashMap<String,String> hashMap = new HashMap<String, String>();
    	int i = 0;
    	String fileName = null;
    	File dir = new File(realPath);
        DiskFileItemFactory factory = new DiskFileItemFactory();  
        ServletFileUpload upload = new ServletFileUpload(factory);  
        upload.setSizeMax(1024*1024*5*9);
        upload.setHeaderEncoding("utf-8");  
        try {  
            List<FileItem> items = upload.parseRequest(request);  
            for(FileItem item : items){  
                if(item.isFormField()){ //username="username"  
                    String name = item.getFieldName();  
                    String value = item.getString("utf-8");  
                    //System.out.println(name + " = " + value);  
                    hashMap.put(name, value);
                } else { //檔案  
                    String name = item.getName();
                    fileName = System.currentTimeMillis() + name.substring(name.lastIndexOf("."));
                   // item.write(new File(dir, System.currentTimeMillis() + name.substring(name.lastIndexOf("."))));
                    item.write(new File(dir, fileName));  
                    hashMap.put("imgs"+i,realPath.substring(realPath.lastIndexOf("\\")).substring(1) +"/"+ fileName);
                } 
            }  
            hashMap.put("num",i+"");
        } catch (Exception e) {  
            e.printStackTrace();  
            logger.error("圖片上傳失敗。",e);
        } 
        return hashMap;
    }
    /** 
     * 以JSON格式輸出 
     * @param response 
     */  
    protected void responseOutWithJson(HttpServletResponse response,  
            Object responseObject) {  
        //將實體物件轉換為JSON Object轉換  
        JSONObject responseJSONObject = JSONObject.fromObject(responseObject);  
        response.setCharacterEncoding("UTF-8");  
        response.setContentType("application/json; charset=utf-8");  
        PrintWriter out = null;  
        try {  
            out = response.getWriter();  
            out.append(responseJSONObject.toString());  
            logger.debug("返回是\n");  
            logger.debug(responseJSONObject.toString());  
        } catch (IOException e) {  
            e.printStackTrace();  
        } finally {  
            if (out != null) {  
                out.close();  
            }  
        }  
    }
}
 

結果基類

package com.ninepoint.babystar.server.bean;

import java.io.Serializable;

import net.sf.json.JSONObject;

/**
 * 請求返回結果基類。
 * 返回結果的公共資料可以放在此類
 * @author nier_ni
 *
 */
public class ResultBaseBean implements Serializable{

	private static final long serialVersionUID = 7755697531438413626L;
	
	/**
	 * 請求結果 1代表成功  0代表失敗
	 * 預設為成功
	 */
	protected int result = 1;
	/**
	 * 錯誤編碼 
	 * 只有當 result為0時才有 errorCode 和 errorMsg
	 */
	protected String errorCode = "";
	/**錯誤資訊*/
	protected String errorMsg = "";
	
	protected Object data = null;
	
	public Object getData() {
		return data;
	}

	public void setData(Object data) {
		this.data = data;
	}

	public int getResult() {
		return result;
	}
	
	public void setResult(int result) {
		this.result = result;
	}
	
	public String getErrorCode() {
		return errorCode;
	}

	public void setErrorCode(String errorCode) {
		this.errorCode = errorCode;
	}

	public String getErrorMsg() {
		return errorMsg;
	}
	
	public void setErrorMsg(String errorMsg) {
		this.errorMsg = errorMsg;
	}
	
	public JSONObject toJsonObject(){
		JSONObject jo = new JSONObject();
		jo.put("result", result);
		jo.put("errorCode", errorCode);
		jo.put("errorMsg", errorMsg);
		jo.put("data", data.toString());
		return jo;
	}
	
	@Override
	public String toString() {
		return this.toJsonObject().toString();
	}
}
 

web.xml配置

<servlet>  
<span style="white-space:pre">	</span><servlet-name>uploadFileServlet</servlet-name>  
<span style="white-space:pre">	</span><servlet-class>com.ninepoint.babystar.server.action.UploadFileServlet</servlet-class>  
</servlet>  
<servlet-mapping>  
	<servlet-name>uploadFileServlet</servlet-name>  
	<url-pattern>/uploadFileServlet</url-pattern>  
</servlet-mapping>