第一次做介面測試，網上找了很久，找不到想要的，只能自己摸索寫了測試程式碼T.T
ApiRequestUtil.java

package com.util.api;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import
 
 java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import net.sf.json.JSONObject;

public class ApiRequestUtil {

    public static void main(String[] args){
        Map<String,Object> mapParam = new HashMap<String,Object>();
        JSONObject str = sendGet("https://請求地址"
 
, mapParam);
        System.out.println(str);
    }

    /**
     * 向指定url傳送POST請求
     * 
     */
    public static JSONObject sendPost(String url,Map<String, Object> paramMap){
        JSONObject jsonObj = null;
        if(url != "https:/Your URL!"){
        //獲取token，這裡是OAuth 2.0認證    
            paramMap.put("access_token"
 
, getToken());
        }
        try {
            URL realUrl = new URL(url);
            URLConnection conn = realUrl.openConnection();
            //指定客戶端能夠接收的內容型別    
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");//設定連線的狀態
            //User-Agent的內容包含發出請求的使用者資訊
            conn.setRequestProperty("user-agent","Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            conn.setRequestProperty("Charset", "UTF-8");
            conn.setDoOutput(true);
            conn.setDoInput(true);

            PrintWriter out = new PrintWriter(conn.getOutputStream());
            String param = mapToParam(paramMap);
            out.print(param);
            out.flush();
            BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String line;
            String str = "";
            while ((line = in.readLine()) != null) {
                str += line;
            }
            jsonObj = JSONObject.fromObject(str);
        } catch (MalformedURLException e) {
            System.err.println("URL協議、格式或者路徑錯誤！" + e);
            e.printStackTrace();
        } catch (IOException e) {
            System.err.println("URL連線失敗！" + e);
            e.printStackTrace();
        } catch (Exception e) {
            System.err.println("傳送  POST 請求出現異常！" + e);
            e.printStackTrace();
        }
        return jsonObj;
    }


    /**
     * 向指定url傳送GET請求
     * 
     */
    public static JSONObject sendGet(String url,Map<String,Object> paramMap){
        JSONObject jsonObj = null;
        paramMap.put("access_token", getToken());
        try {
            String requestUrl = url + "?" + mapToParam(paramMap);
            URL realUrl = new URL(requestUrl);

            URLConnection conn = realUrl.openConnection();
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent","Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            conn.setRequestProperty("Charset", "UTF-8");
            conn.connect();
            System.out.println("介面連線成功");

            BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String str = "";
            String line;
            while ((line = in.readLine()) != null) {
                str += line;
            }
            jsonObj = JSONObject.fromObject(str);
        } catch (MalformedURLException e) {
            System.err.println("URL協議、格式或者路徑錯誤！" + e);
            e.printStackTrace();
        } catch (IOException e) {
            System.err.println("URL連線失敗！" + e);
            e.printStackTrace();
        } catch (Exception e) {
            System.err.println("傳送  GET 請求出現異常！" + e);
            e.printStackTrace();
        }
        return jsonObj;
    }

    /**
     * 將Map形式的引數轉為url引數
     * @Title mapToParam
     */
    public static String mapToParam(Map<String,Object> paramMap){
        //取出Map裡的資料拼接請求引數
        String param = "";
        if (paramMap != null && paramMap.size() > 0) {
            Iterator<String> ite = paramMap.keySet().iterator();
            while (ite.hasNext()) {
                String key = ite.next();// key
                Object value = paramMap.get(key);
                param += key + "=" + value + "&";
            }
            param = param.substring(0, param.length() - 1);
        }
        return param;
    }

    /**
     * 獲取access_token許可權認證令牌（token）
     */
    public static String getToken(){
        Map<String,Object> mapParam = new HashMap<String,Object>();//請求引數
        mapParam.put("grant_type", "password");
        mapParam.put("引數名","引數值");//這裡的引數按照要求傳就好
        mapParam.put("redirect_uri","http://www.baidu.com/");
        mapParam.put("username","");
        mapParam.put("password","");
        String pathUrl = "獲取token的URL";
        Map<String,Object> result = sendPost(pathUrl, mapParam);
        System.out.println(result.toString());
        return (String) result.get("access_token");
    }
}

頁面可以自己寫，我是直接在系統選單管理里加的連結：tool/interfaceTest.do
效果圖如下：