java后台post请求调用接口

今天项目接口一直调不通，于是我修改了相关的代码

在网上找到了一个很好的例子:

	 public static String httpPost(String urlStr,Map params){
         URL connect;
         StringBuffer data = new StringBuffer();  
        try {  
            connect = new URL(urlStr);  
            HttpURLConnection connection = (HttpURLConnection)connect.openConnection();  
            connection.setRequestMethod("POST");  
            connection.setDoOutput(true); 
            connection.setDoInput(true);
            connection.setUseCaches(false);//post不能使用缓存
            connection.setInstanceFollowRedirects(true);
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            OutputStreamWriter paramout = new OutputStreamWriter(  
                    connection.getOutputStream(),"UTF-8"); 
            String paramsStr = "";   //拼接Post 请求的参数
           for(String param : params.keySet()){
               paramsStr += "&" + param + "=" + params.get(param);
           }  
           if(!paramsStr.isEmpty()){
               paramsStr = paramsStr.substring(1);
           }
            paramout.write(paramsStr);  
            paramout.flush();  
            BufferedReader reader = new BufferedReader(new InputStreamReader(  
                    connection.getInputStream(), "UTF-8"));  
            String line;              
            while ((line = reader.readLine()) != null) {          
                data.append(line);            
            }  
          
            paramout.close();  
            reader.close();  
        } catch (Exception e) {  
            // TODO Auto-generated catch block  
            e.printStackTrace();  
        }  
       return data.toString();
    }
	
	
	public static void main(String[] args) {
		 JSONObject json1=new JSONObject();
         json1.put("DTYPE",'0');
         json1.put("KEY", "jsddkj");
         json1.put("CODE","FacilityServer.getFacilityList");
         JSONObject json2=new JSONObject();
         json2.put("table", "navi_jiayouzhan");
         json2.put("x1","118.181837");
         json2.put("y1","33.557312");
         json2.put("x2","119.254133");
         json2.put("y2","34.631957");
         json1.put("DATA",json2);
         Map map=new HashMap<>();
         map.put("DATA", json1.toString());
         String url="";
        System.out.println(httpPost(url,map));
	}

下面的参数仅仅我是本地需要的参数，希望对你有所帮助

希望大家一起学习交流: