设置请求头信息User-Agent

设置请求头信息User-Agent来模拟浏览器。

先来看User-Agent：

当我们向服务器发送请求时，浏览器会将一些头信息附加上，然后发给服务器。

如上图所示头信息（请求头信息 Request Headers）

 

我们的代码：

package com.zhi.httpClient2;

import org.apache.http.HttpEntity;
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 Demo {

	public static void main(String[] args) throws Exception {
		CloseableHttpClient closeableHttpClient=HttpClients.createDefault(); //1、创建实例
		HttpGet httpGet=new HttpGet("http://www.tuicool.com"); //2、创建请求
		
		httpGet.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.122 Safari/537.36 SE 2.X MetaSr 1.0");
		
		CloseableHttpResponse closeableHttpResponse=closeableHttpClient.execute(httpGet); //3、执行
		HttpEntity httpEntity=closeableHttpResponse.getEntity(); //4、获取实体
		System.out.println(EntityUtils.toString(httpEntity, "utf-8")); //5、获取网页内容，并且指定编码
		
		closeableHttpResponse.close();
		closeableHttpClient.close();
	}

}

　　

httpGet.setHeader(String key,String value);

参数是键值对的形式