Http get/post 练习实例

package com.http.test;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;


public class SendHttp {
	//public static final String GET_URL = "Http://localhost:8888/HttpDemo/";
	public static final String GET_URL = "Http://www.baidu.com/";
	public static final String POST_URL = "Http://localhost:8888/HttpDemo/";
	
	//获取get请求的数据资源
	
	public static void getSourceFromHttpGetRequest() throws IOException{
			//拼接请求地址，包含数据
		String getURL = GET_URL+"?username="+URLEncoder.encode("this is http get request", "UTF-8");
		URL url = new URL(getURL);
		
		HttpURLConnection connection = (HttpURLConnection) url.openConnection();
		//建立连接
		connection.connect();
		
		//发送数据到服务器并使用Reader读取返回的数据
		
		BufferedReader reader =  new BufferedReader(new InputStreamReader(connection.getInputStream()));
		String lines;
		System.out.println("===================================================");
		System.out.println("请求的内容");
		System.out.println("===================================================");
		while((lines=reader.readLine())!=null){
			System.out.println(lines);
		}
		reader.close();
		//断开连接
		connection.disconnect();
		
		System.out.println("============================");
		System.out.println("请求结束");
		System.out.println("============================");
	}
	
	public static void getSourceFromHttpRequestPost() throws IOException{
		URL postURL = new URL(POST_URL);
		
		//打开连接
		
		HttpURLConnection connection = (HttpURLConnection) postURL.openConnection();
		connection.setDoOutput(true);
		connection.setDoInput(true);
		
		connection.setRequestMethod("POST");
		
		connection.setUseCaches(false);
		connection.setInstanceFollowRedirects(true);
		connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
		
		DataOutputStream out = new DataOutputStream(connection.getOutputStream());
		
		String content = "firstname="+URLEncoder.encode("POST请求", "UTF-8");
		
		out.writeBytes(content);
		out.flush();
		out.close();
		
		BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
		String lines ;
		while (( lines =reader.readLine()) !=null ){
			System.out.println(lines);
		}
		
		System.out.println("==========================");
		System.out.println("post end");
		System.out.println("==========================");
		reader.close();
	}
	
	public static void main(String[] args) throws IOException {
		//getSourceFromHttpGetRequest();
		getSourceFromHttpRequestPost();
	}
}