HttpClient4模拟表单提交[通俗易懂]

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();


}





}

}

运行结果 

test端

请求url地址http://localhost:80/testjs/servlet/FormServlet
Login form get: HTTP/1.1 200 OK
王五, 欢迎访问

tomcat服务器端

你输入的姓名是:王五
你输入的密码是:12345