类文件

这节课的地址不能用了,所以post请求返回的的不是200而是403

package cn.itcast.crawler.test;

import com.sun.org.glassfish.gmbal.NameValue;
import org.apache.hc.client5.http.classic.methods.HttpPost;
import org.apache.hc.client5.http.entity.UrlEncodedFormEntity;
import org.apache.hc.client5.http.impl.classic.CloseableHttpClient;
import org.apache.hc.client5.http.impl.classic.CloseableHttpResponse;
import org.apache.hc.client5.http.impl.classic.HttpClients;
import org.apache.hc.core5.http.NameValuePair;
import org.apache.hc.core5.http.io.entity.EntityUtils;
import org.apache.hc.core5.http.message.BasicNameValuePair;

import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;

public class HttpPostParamTest {

    public static void main(String[] args)throws Exception {
        //创建HttpClient对象
        CloseableHttpClient httpClient = HttpClients.createDefault();
        //创建HttpGet对象,url访问地址
        HttpPost httpPost = new HttpPost("http://yun.itheima.com/search");

        //声明list集合,封装表单中的参数
        List<NameValuePair> params=new ArrayList<NameValuePair>();
        //设置请求地址是: https://yun.itheima.com/search?keys=Java

        params.add(new BasicNameValuePair("keys","Java"));
        //创建表单的Entity对象,第一个是封装好的表单数据,第二个是字符编码
        UrlEncodedFormEntity formEntity=new UrlEncodedFormEntity(params, Charset.forName("utf8"));
        //设置表单的Entity对象到post
        httpPost.setEntity(formEntity);
        CloseableHttpResponse response = null;
        try {
        //使用HttpClient发起请求,获取response
            response = httpClient.execute(httpPost);
            //解析响应
            if(response.getCode()==200){
                String content = EntityUtils.toString(response.getEntity(), "utf8");
                System.out.println(content.length());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            //关闭response
            try {
                response.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
            try {
                httpClient.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        //解析响应

    }
}