Java servlet Practice Test

Steps:

0. First create Web project, project name: Test_servlet

1, write Servlet,testservlet.java file content:

Package Com.ouyang.servlet;import Java.io.ioexception;import Java.sql.connection;import Java.sql.DriverManager; Import Java.sql.preparedstatement;import Java.sql.resultset;import Java.sql.sqlexception;import Java.util.arraylist;import Java.util.list;import Javax.servlet.requestdispatcher;import Javax.servlet.servletexception;import Javax.servlet.http.httpservlet;import Javax.servlet.http.httpservletrequest;import javax.servlet.http.HttpServletResponse; @SuppressWarnings ("Serial") public class Testservlet extends HttpServlet {@Overrideprotected void doget (HttpServletRequest req, httpservletresponse RESP) throws Servletexception, IOException {req.setcharacterencoding ("utf-8"); String url = "jdbc:mysql://localhost:3306/test01"; String user = "root"; String password = "xxx"; Connection Connection = null; PreparedStatement preparedstatement = null; ResultSet ResultSet = null; String sql = "SELECT ID, Name, age from Individual_information"; list<list<string>> record = new Arraylist<> (); try {class.forname ("com.mysql.jdbc.Driver"); connection = drivermanager.getconnection (URL, user, password); PreparedStatement = connection.preparestatement (sql); resultSet = Preparedstatement.executequery (); list<string> tmp = new arraylist<> (), while (Resultset.next ()) {Tmp.add (resultset.getstring ("id")); Tmp.add (resultset.getstring ("name")), Tmp.add (resultset.getstring ("Age")); Record.add (New arraylist<string> (TMP)); Tmp.clear ();}} catch (ClassNotFoundException e) {e.printstacktrace ();} catch (SQLException e) {e.printstacktrace ();} Req.setattribute ("Individual_information", record); RequestDispatcher RequestDispatcher = Req.getrequestdispatcher ("get_info.jsp"); Requestdispatcher.forward (req, resp );} @Overrideprotected void DoPost (HttpServletRequest req, HttpServletResponse resp) throws Servletexception, IOException { This.doget (req, resp);}}

　　

2. Add the servlet to Web. XML and add the contents of the file

<?xml version= "1.0" encoding= "UTF-8"? ><web-app xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance" xmlns= "Http://java.sun.com/xml/ns/javaee" xsi:schemalocation= "Http://java.sun.com/xml/ns/javaee/http Java.sun.com/xml/ns/javaee/web-app_3_0.xsd "id=" webapp_id "version=" 3.0 ">  <display-name>test_web </display-name>  <welcome-file-list>    <welcome-file>index.jsp</welcome-file>  </welcome-file-list>    <servlet>  <servlet-name>testServlet</servlet-name>  <servlet-class>com.ouyang.servlet.TestServlet</servlet-class>  </servlet>  < servlet-mapping>  <servlet-name>testServlet</servlet-name>  <url-pattern>/ testservlet</url-pattern>  </servlet-mapping>    </web-app>

　　

3, write jump page get_info.jsp

<% @page import= "java.util.List"%><%@ page language= "java" contenttype= "text/html; Charset=utf-8 "    pageencoding=" Utf-8 "%><! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" "Http://www.w3.org/TR/html4/loose.dtd" >
　　
Test
Visit: Http://localhost/test_servlet/testServlet
Java servlet Practice Test