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 params=new ArrayList();

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