HttpURLConnection GET和POST請求調用遠程接口

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");	            
			//設置連接遠程服務器的超時時間
            connection.setConnectTimeout(30000);
            //設置讀取遠程返回的數據時間
            connection.setReadTimeout(30000);
            //設置請求參數的數據格式
			connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            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("錯誤狀態碼："+responseCode);
		    	result.put("code", responseCode);
	            result.put("message", "異常");
		    }
            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();
            //設置請求方式
			connection.setRequestMethod("POST");
			//設置是否向遠程服務寫入數據
			connection.setDoOutput(true);
			//設置是否從遠程服務讀取數據
            connection.setDoInput(true);
			//設置是否使用緩存，post請求不能使用緩存
	        connection.setUseCaches(false);            
	        //設置連接主機服務器超時時間
            connection.setConnectTimeout(30000);
            //設置讀取主機服務器返回數據超時時間
            connection.setReadTimeout(30000);
	        //設置本次連接是否自動重定向
	        connection.setInstanceFollowRedirects(true);   
			connection.setRequestProperty("User-Agent", "Mozilla/5.0");            
			//設置接收數據的格式
            connection.setRequestProperty("Accept", "application/json"); 
            //設置請求參數的數據格式
            connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            //設置與服務器保持連接
            connection.addRequestProperty("Connection","Keep-Alive");
            connection.setRequestProperty("Accept-Language", "zh-CN,zh;0.9");
            //連接
			connection.connect();
			
			//獲取響應
			DataOutputStream out = new DataOutputStream(connection.getOutputStream());

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

            //響應碼
			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", "異常");
		    }
		    //關閉流
            out.flush();
            out.close();
            //斷開連接
            connection.disconnect();
            return result;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}
}