HttpClient中带参数的get请求

Posted 2020-12-10 juddy

直接代码：

package cn.itcast.crawler.test;
import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

import java.io.IOException;
import java.net.URISyntaxException;

public class HttpGetParamTest {
    public static void main(String[] args) throws Exception {
        //1.创建HttpClient对象
          CloseableHttpClient httpClient= HttpClients.createDefault();
          //要求：设置请求的地址是：http://yun.itheima.com/search?keys=java
        //创建URLBuilder
        URIBuilder uriBuilder=new URIBuilder("http://yun.itheima.com/search");
        //设置参数
        uriBuilder.setParameter("keys","java");
          //2.创建HttpGet对象，设置URL地址
        HttpGet httpGet=new HttpGet(uriBuilder.build());
        System.out.println("发送请求的信息："+httpGet);
        //使用httpClient发起响应获取repsonse
        CloseableHttpResponse response=null;
        try {
            response=httpClient.execute(httpGet);
            //4.解析响应，获取数据
            //判断状态码是否是200
            if(response.getStatusLine().getStatusCode()==200){
                HttpEntity httpEntity=response.getEntity();
                String content=EntityUtils.toString(httpEntity,"utf8");
                System.out.println(content.length());
            }
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                response.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                httpClient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }
}
执行结果：

 

 有上面的结果可以知道，发送的是一个get请求，并且是参数的；

//创建URLBuilder
        URIBuilder uriBuilder=new URIBuilder("http://yun.itheima.com/search");
        //设置参数
        uriBuilder.setParameter("keys","java");
上面两行代码是带参数的主要代码，这是带一个参数，当我们需要带两个或两个以上的参数时，代码如下：

uriBuilder.setParameter("keys","java").setParameter("","");
在后面直接添加就可以了