設置請求頭信息User-Agent來模擬瀏覽器。

先來看User-Agent：

當我們向服務器發送請求時，瀏覽器會將一些頭信息附加上，然後發給服務器。

如上圖所示頭信息（請求頭信息 Request Headers）

我們的代碼：

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、創建實例
		HttpGet httpGet=new HttpGet("http://www.tuicool.com"); //2、創建實例
		
		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、執行
		HttpEntity httpEntity=closeableHttpResponse.getEntity(); //4、獲取實體
		System.out.println(EntityUtils.toString(httpEntity, "utf-8")); //5、獲取網頁內容，並且指定編碼
		
		closeableHttpResponse.close();
		closeableHttpClient.close();
	}

}

httpGet.setHeader(String key,String value);

參數是鍵值對的形式

設置請求頭信息User-Agent