HttpClient4模拟表单提交[通俗易懂]

全栈程序员-用户IM • 2022年7月22日上午6:16 • 未分类

大家好，又见面了，我是你们的朋友全栈君。

这里用httpclient4.3模拟一个表单普通文本提交的方法

建一个servlet接受表单数据，只传递2个参数，name和password

//servlet的访问地址是:http://localhost:80/testjs/servlet/FormServlet

public class FormServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

request.setCharacterEncoding(“utf-8”);
response.setCharacterEncoding(“utf-8”);

//获取传递来的参数
String name = request.getParameter(“name”);
String password = request.getParameter(“password”);

System.out.println(“你输入的姓名是:”+name);
System.out.println(“你输入的密码是:”+password);
//设置响应内容
response.getWriter().write(name+”, 欢迎访问”);
}

}

用到的jar包有:commons-codec-1.6.jar,commons-logging-1.1.3.jar,httpclient-4.3.1.jar,httpcore-4.3.jar,httpmime-4.3.1.jar

package com.test.httpClient.myTest;

import java.io.IOException;

import java.nio.charset.Charset;

import java.util.ArrayList;

import java.util.List;

import org.apache.http.Consts;

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 org.junit.Test;

public class TestHttpClient4 {

@Test

public void test1() throws IOException{

CloseableHttpClient httpClient = HttpClients.createDefault();

try{

//post请求的url地址

HttpPost httpPost = new HttpPost(“http://localhost:80/testjs/servlet/FormServlet”);

List <NameValuePair> nvps = new ArrayList <NameValuePair>();

//传递2个参数 name和password

nvps.add(new BasicNameValuePair(“name”,”王五”));

nvps.add(new BasicNameValuePair(“password”,”12345″));

//转码封装成请求实体

HttpEntity reqEntity = new UrlEncodedFormEntity(nvps,Consts.UTF_8);

httpPost.setEntity(reqEntity);

System.out.println(“请求url地址”+httpPost.getURI());

//提交表单请求 response是表单的响应

CloseableHttpResponse response = httpClient.execute(httpPost);

try {

HttpEntity respEntity = response.getEntity();

//响应状态

System.out.println(“Login form get: ” + response.getStatusLine());

//EntityUtils.consume(entity);

//获取响应内容

System.out.println(EntityUtils.toString(respEntity,Charset.forName(“utf-8”)));

//销毁

EntityUtils.consume(respEntity);

} finally {

response.close();

}

}finally{

httpClient.close();

}

}