java servlet练习测试
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内容图文
步骤:
0、首先创建web project,工程名:test_servlet
1、编写Servlet,TestServlet.java文件内容:
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 { @Override protected 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); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { this.doGet(req, resp); } }
2、将servlet添加到web.xml, 添加后的文件内容
<?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、编写跳转页面 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"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>get_info</title> </head> <body> <% @SuppressWarnings("unchecked") List<List<String>> record = (List<List<String>>)request.getAttribute("individual_information"); for(List<String> list : record){ out.println("<li>" + list.toString() + "</li>"); } %> </body> </html>
【测试】
访问:http://localhost/test_servlet/testServlet
原文:http://www.cnblogs.com/ouyxy/p/7216804.html
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