httpclient

添加架包支持：

    <dependency>
  		<groupId>org.apache.httpcomponents</groupId>
  		<artifactId>httpclient</artifactId>
  		<version>4.5.2</version>
  </dependency>

　　

第一步是獲取http客戶端的實列，編寫代碼

 

package com.java.httpclient;

import java.io.IOException;

import org.apache.http.HttpEntity;
import org.apache.http.ParseException;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

public class Helloword {
	public static void main(String[] args) {
		CloseableHttpClient  httpclient=HttpClients.createDefault(); //建立瀏覽器實列
		HttpGet httpget=new HttpGet("http://www.java1234.com"); //建立get實列
		CloseableHttpResponse response=null;
		try {
			//執行get請求
			response=httpclient.execute(httpget);
		} catch (ClientProtocolException e) { //http協議異常
			e.printStackTrace();
		} catch (IOException e) { //io異常
			e.printStackTrace();
		}
		
		//返回實體
	     HttpEntity entity=response.getEntity();
	     try {
			System.out.println("輸出實體："+EntityUtils.toString(entity,"utf-8"));
		} catch (ParseException e) { //解析異常
			e.printStackTrace();
			
		} catch (IOException e) {  //io 異常

			e.printStackTrace();
		}
		try {
			response.close();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	}
}