HttpClient之帶參數的post請求

 具體代碼：

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.創建HttpClient對象
          CloseableHttpClient httpClient= HttpClients.createDefault();
          //2.創建HttpPost對象，設置URL地址
        HttpPost httpPost=new HttpPost("http://yun.itheima.com/search");;

        //聲明list集合，用來分裝表單中的參數
        //要求：設置請求的地址是：http://yun.itheima.com/search?keys=java
        List<NameValuePair> params=new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("keys","java"));
        // 創建表單的Entity對象,第一個參數是封裝好的表單數據，第二個參數就是編碼方式
        UrlEncodedFormEntity formEntity=new UrlEncodedFormEntity(params,"utf8");
        //設置表單的Entity對象到Post請求中
        httpPost.setEntity(formEntity);
       

        //使用httpClient發起響應獲取repsonse
        CloseableHttpResponse response=null;
        try {
            response=httpClient.execute(httpPost);
            //4.解析響應，獲取數據
            //判斷狀態碼是否是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();
            }
        }

    }
}
執行結果：

 

 在帶參數的post請求中，參數並不會出現在地址欄中，

與不帶參數的post請求相比較，帶參數的post代碼的核心內容就是上面代碼中添加了背景顏色的代碼