HttpURLConnection GET和POST请求调用远程接口

package com.test;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;
import org.json.JSONObject;


public class Test {
	
	public static void main(String[] args) {
		useGetMethod("http://127.0.0.1:8080/getData");
		usePostMethod("http://127.0.0.1:8080/getData");
	}
	
	
	public static Map<String,Object> useGetMethod(String get_url){
		try {
			Map<String,Object> result = new HashMap<String,Object>();
			URL url = new URL(get_url);
			HttpURLConnection connection = (HttpURLConnection) url.openConnection();
			connection.setRequestMethod("GET");	            
			//设置连接远程服务器的超时时间
            connection.setConnectTimeout(30000);
            //设置读取远程返回的数据时间
            connection.setReadTimeout(30000);
            connection.connect();
            
			int responseCode = connection.getResponseCode();
		    if (responseCode == HttpURLConnection.HTTP_OK) {
		    	StringBuffer str = new StringBuffer();
		    	InputStream in = connection.getInputStream();   
	            BufferedReader br = new BufferedReader(new InputStreamReader(in, "utf-8"));
	            try{
	        	    String line = "";  
	                while((line = br.readLine()) != null) {   
	                     str.append(line); 
	                }
	            } finally {
	        	    br.close();   
	                in.close();
	            }
	            JSONObject jsonObject = new JSONObject(str.toString());
	            result.put("code", jsonObject.get("code"));
	            result.put("message", jsonObject.get("message"));
		    }else{
		    	System.out.println("错误状态码："+responseCode);
		    	result.put("code", responseCode);
	            result.put("message", "异常");
		    }
            connection.disconnect();
            return result;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}
	
	
	public static Map<String,Object> usePostMethod(String post_url){
		try {
			Map<String,Object> result = new HashMap<String,Object>();
			URL url = new URL(post_url);
			HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            //设置请求方式
			connection.setRequestMethod("POST");
			//设置是否向远程服务写入数据
			connection.setDoOutput(true);
			//设置是否从远程服务读取数据
            connection.setDoInput(true);
			//设置是否使用缓存，post请求不能使用缓存
	        connection.setUseCaches(false);            
	        //设置连接主机服务器超时时间
            connection.setConnectTimeout(30000);
            //设置读取主机服务器返回数据超时时间
            connection.setReadTimeout(30000);
	        //设置本次连接是否自动重定向
	        connection.setInstanceFollowRedirects(true);   
			connection.setRequestProperty("User-Agent", "Mozilla/5.0");            
			//设置接收数据的格式
            connection.setRequestProperty("Accept", "application/json"); 
            //设置请求参数的数据格式
            connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            //设置与服务器保持连接
            connection.addRequestProperty("Connection","Keep-Alive");
            connection.setRequestProperty("Accept-Language", "zh-CN,zh;0.9");
            //连接
			connection.connect();
			
			//获取响应
			DataOutputStream out = new DataOutputStream(connection.getOutputStream());

			//post参数
			String content = "name="+URLEncoder.encode("小明", "utf-8")+"&password=123";
            out.writeBytes(content);
            //out.write(content);

            //响应码
			int responseCode = connection.getResponseCode();
			//200
		    if (responseCode == HttpURLConnection.HTTP_OK) {
		    	StringBuffer str = new StringBuffer();
		    	InputStream in = connection.getInputStream();   
	            BufferedReader br = new BufferedReader(new InputStreamReader(in, "utf-8"));
	            try{
	        	    String line = "";  
	                while((line = br.readLine()) != null) {   
	                     str.append(line); 
	                }
	            } finally {
	        	    br.close();   
	                in.close();
	            }
	            JSONObject jsonObject = new JSONObject(str.toString());
	            result.put("code", jsonObject.get("code"));
	            result.put("message", jsonObject.get("message"));
		    }else{
		    	result.put("code", responseCode);
	            result.put("message", "异常");
		    }
		    //关闭流
            out.flush();
            out.close();
            //断开连接
            connection.disconnect();
            return result;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}
}