项目要求：实现post请求，且请求格式是json格式。

maven依赖包

     
          
      
       org.apache.httpcomponents
          
      
       httpclient
          
      
       4.5.3
       
      
     
          
      
       commons-httpclient
          
      
       commons-httpclient
          
      
       3.1
        
     

java代码实现：

HttpClient httpClient = new HttpClient();httpClient.getParams().setContentCharset("UTF-8");PostMethod method = new PostMethod(url);String str = "{\r\n" +     			"	\"beginDate\":\"2017-11-01\",\r\n" +     			"	\"endDate\":\"2017-11-01\"\r\n" +     			"}";RequestEntity entity = new StringRequestEntity(str,"application/json","UTF-8");method.setRequestEntity(entity);httpClient.executeMethod(method);InputStream in = method.getResponseBodyAsStream();//下面将stream转换为StringStringBuffer sb = new StringBuffer();InputStreamReader isr = new InputStreamReader(in, "UTF-8");char[] b = new char[4096];for(int n; (n = isr.read(b)) != -1;) {    		sb.append(new String(b, 0, n));    	} String returnStr = sb.toString(); System.out.println(returnStr);