最近在模擬post json資料到服務端，然後返回json資訊，當然也要實現模擬服務端的程式碼，服務單可以用controller實現，但是發現一個問題，就是返回來的是個頁面，頁面中才包含返回的json資料，怎麼取出去來了，網上部落格一般寫的都是客戶端的post,後來猛然想到以前和老師學安卓的時候的有段程式碼就是把返回的json資料放在頁面上，才發現可以用getWriter()把頁面中的json資料單獨打在頁面中

程式碼實現如下：

模擬的服務端：

	@RequestMapping(value = "/loginTest", method = RequestMethod.POST)
	public void test(HttpServletRequest request,HttpServletResponse response) throws Exception {
		//JSONObject json=JSONObject.fromObject(data);
		 // 讀取請求內容
        BufferedReader br = new BufferedReader(new InputStreamReader(request.getInputStream()));
        String line = null;
        StringBuilder sb = new StringBuilder();
        while((line = br.readLine())!=null){
            sb.append(line);
        }

        // 將資料解碼
        String reqBody = sb.toString();
		JSONObject json=JSONObject.fromObject(reqBody);
    	String data = "{'isAdmin':'true', 'usename':wsf}";
        
    	PrintWriter writer = response.getWriter();
    	writer.write(data);    //這裡是你要返回的字串
    	writer.flush();
    	writer.close(); 	
    	}
 

/**
 * @file TestPost.java
 * @date 2016年9月10日
 * @version 3.4.1
 *
 * Copyright (c) 2013 Sihua Tech, Inc. All Rights Reserved.
 */
package cn.com.dongyaTest.controller;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;

import org.apache.commons.io.IOUtils;
import org.apache.http.HttpEntity;
import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicHeader;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;
import net.sf.json.JSONObject;


/**
 * 
 *
 * @author chengjian.he
 * @version  3.4, 2016年9月10日 下午3:03:50 
 * @since   Yeexun 3.4
 */
public class TestPost {

	public static int postBody(String urlPath, String data) throws Exception {
		try{  
		            // Configure and open a connection to the site you will send the request  
		            URL url = new URL(urlPath);  
		            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();  
		            // 設定doOutput屬性為true表示將使用此urlConnection寫入資料  
		            urlConnection.setDoOutput(true);  
		            // 定義待寫入資料的內容型別，我們設定為application/x-www-form-urlencoded型別  
		            urlConnection.setRequestProperty("content-type", "application/x-www-form-urlencoded");  
		            // 得到請求的輸出流物件  
		            OutputStreamWriter out = new OutputStreamWriter(urlConnection.getOutputStream());  
		            // 把資料寫入請求的Body  
		            out.write(data);  
		            out.flush();  
		            out.close(); 
		              
		            // 從伺服器讀取響應  
		            InputStream inputStream = urlConnection.getInputStream();  
		            String encoding = urlConnection.getContentEncoding();  
		            String body = IOUtils.toString(inputStream, encoding);  
		            if(urlConnection.getResponseCode()==200){
		            return 200;
		            }else{
		            throw new Exception(body);
		            }
		        }catch(IOException e){
		        throw e;
		        }
		}
	
	  
	  public static JSONObject doPost(String url,JSONObject json){
	    DefaultHttpClient client = new DefaultHttpClient();
	    HttpPost post = new HttpPost(url);
	    JSONObject response = null;
	    try {
	      StringEntity s = new StringEntity(json.toString());
	      s.setContentEncoding("UTF-8");
	      s.setContentType("application/json");//傳送json資料需要設定contentType
	      post.setEntity(s);
	      HttpResponse res = client.execute(post);
	      if(res.getStatusLine().getStatusCode() == HttpStatus.SC_OK){
	        HttpEntity entity = res.getEntity();
	        String result = EntityUtils.toString(res.getEntity());// 返回json格式：
	        response = JSONObject.fromObject(result);
	      }
	    } catch (Exception e) {
	      throw new RuntimeException(e);
	    }
	    return response;
	  }


		public static void main(String[] args) {
		try {
		//	String data = "{'username':'shihuan', 'password':123456}";
		//TestPost.postBody("http://localhost:8009/wechatyeexun/loginTest.do", data);
			 String url = "http://localhost:8009/wechatyeexun/loginTest.do";
			    JSONObject params = new JSONObject();
			    params.put("username", "wsf");
			    params.put("password", "123");
			    String ret = doPost(url, params).toString();
			    System.out.println(ret);
			   /* final String APPLICATION_JSON = "application/json";
			    
			    final String CONTENT_TYPE_TEXT_JSON = "text/json";
			    DefaultHttpClient httpClient = new DefaultHttpClient();
		        HttpPost httpPost = new HttpPost(url);
		        httpPost.addHeader(HTTP.CONTENT_TYPE, APPLICATION_JSON);
		        
		        StringEntity se = new StringEntity(params.toString());
		        se.setContentType(APPLICATION_JSON);
		        se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, APPLICATION_JSON));
		        httpPost.setEntity(se);
		        httpClient.execute(httpPost);*/
		} catch (Exception e) {
		e.printStackTrace();
		}
		}
		
		
}