HttpClient之带参数的post请求

 具体代码：

package cn.itcast.crawler.test;

import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;

public class HttpPostParamTest {
    public static void main(String[] args) throws Exception {
        //1.创建HttpClient对象
          CloseableHttpClient httpClient= HttpClients.createDefault();
          //2.创建HttpPost对象，设置URL地址
        HttpPost httpPost=new HttpPost("http://yun.itheima.com/search");;

        //声明list集合，用来分装表单中的参数
        //要求：设置请求的地址是：http://yun.itheima.com/search?keys=java
        List<NameValuePair> params=new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("keys","java"));
        // 创建表单的Entity对象,第一个参数是封装好的表单数据，第二个参数就是编码方式
        UrlEncodedFormEntity formEntity=new UrlEncodedFormEntity(params,"utf8");
        //设置表单的Entity对象到Post请求中
        httpPost.setEntity(formEntity);
       

        //使用httpClient发起响应获取repsonse
        CloseableHttpResponse response=null;
        try {
            response=httpClient.execute(httpPost);
            //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：

 

 在带参数的post请求中，参数并不会出现在地址栏中，

与不带参数的post请求相比较，带参数的post代码的核心内容就是上面代码中添加了背景颜色的代码