java HttpClient 的get使用的Demo_java get调用demo-优快云博客

终于撸完了所有的期末设计,看到贴吧里有很多人求httpclient的用法,所以就来一发获取指定贴吧用户回复帖子和主题的小Demo

使用 HttpClient 需要以下 6 个步骤：
1. 创建 HttpClient 的实例
2. 创建某种连接方法的实例，在这里是GetMethod。在 GetMethod 的构造函数中传入待连接的地址
3. 调用第一步中创建好的实例的 execute 方法来执行第二步中创建好的 method 实例
4. 读 response
5. 释放连接。无论执行方法是否成功，都必须释放连接
6. 对得到后的内容进行处理

import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
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 ClientProtocolException, IOException{
		CloseableHttpClient httpclient = HttpClients.createDefault();
		 String url="http://tieba.baidu.com/f/search/ures?ie=utf-8&kw=&qw=&rn=10&un="+"D8吧务组"+"&sm=1&pn="+"1";//贴吧user搜索   
		HttpGet httpget = new HttpGet(url);
		System.out.println(httpget);
		HttpResponse response = httpclient.execute(httpget);
		HttpEntity entity = response.getEntity();
        String html = EntityUtils.toString(entity);
     //匹配
		 String reg = "<span class=\"p_title\">(.*?)</span>";
			String content = "<div class=\"p_content\">(.*?)</div>";
			String tieba = "贴吧：(.*?)作者";
			String date = "<font class=\"p_green p_date\">(.*?)</font>";
			Pattern r = Pattern.compile(reg, Pattern.DOTALL);
			Matcher mr = r.matcher(html);
			Pattern c = Pattern.compile(content, Pattern.DOTALL);
			Matcher mc = c.matcher(html);
			Pattern t = Pattern.compile(tieba, Pattern.DOTALL);
			Matcher mt = t.matcher(html);
			Pattern d = Pattern.compile(date, Pattern.DOTALL);
			Matcher md = d.matcher(html);
		
		
			while (mr.find()) {	
				System.out.println(mr.group(1));
				while (mc.find()) {
					if (mc.group(1).equals("")) {
						System.out.println("表情");
					} else {
						System.out.println(mc.group(1));
					}
					while (mt.find()) {
						System.out.println(mt.group(1));
						while (md.find()) {
							System.out.println(md.group(1));
							break;
						}
						break;
					}
					break;
				}
			}
	}
}

输出结果:

GET http://tieba.baidu.com/f/search/ures?ie=utf-8&kw=&qw=&rn=10&un=D8吧务组&sm=1&pn=1 HTTP/1.1
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demo中使用的jar是4.4.1版本,尽量选择4.3以上版本,否则语法可能出现很大出入.