Maven3路程（三）用Maven创建第一个web项目(2)servlet演示

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Maven3路程（三）用Maven创建第一个web项目(2)servlet演示

上一章用Maven新建了web项目成功后，本文演示在此基础上应用servlet。

1.首先修改pom.xml文件，添加servlet依赖

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.lei.demo</groupId><artifactId>maven-web-demo</artifactId><packaging>war</packaging><version>0.0.1-SNAPSHOT</version><name>maven-web-demo Maven Webapp</name><url>http://maven.apache.org</url><dependencies><!-- JUnit配置 --><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>3.8.1</version><scope>test</scope></dependency><!-- 添加Servlet -->  <dependency>    <groupId>javax.servlet</groupId>    <artifactId>servlet-api</artifactId>    <version>2.5</version>    <scope>provided</scope>    </dependency></dependencies><build><finalName>maven-web-demo</finalName></build>
</project>

修改完保存后，项目会从Maven仓库中自动添加servlet-api-2.5.jar包的引用，如果仓库中没有，会自动下载。

引用后见图。

2.新建一个Servlet

在src/main/java下创建一个Servlet，ServletDemo

package com.sulei.demo;import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;/*** Servlet implementation class ServletDemo*/
public class ServletDemo extends HttpServlet {private static final long serialVersionUID = 1L;public ServletDemo() {super();}protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {doPost(request, response);}protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {request.setCharacterEncoding("UTF-8");  response.setContentType("text/html;charset=utf-8");String action = request.getParameter("action");  if("login_input".equals(action)) {  request.getRequestDispatcher("login.jsp").forward(request , response);  } else if("login".equals(action)) {  String name = request.getParameter("name");  String password = request.getParameter("password");  System.out.println("name->" + name + ",password->" + password);}}}

3.修改Web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:javaee="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"><javaee:display-name>Archetype Created Web Application</javaee:display-name><servlet><javaee:description></javaee:description><javaee:display-name>ServletDemo</javaee:display-name><servlet-name>ServletDemo</servlet-name><servlet-class>com.sulei.demo.ServletDemo</servlet-class></servlet><servlet-mapping><servlet-name>ServletDemo</servlet-name><url-pattern>/demo</url-pattern></servlet-mapping>
</web-app>

4.创建index.jsp

<%@ 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>Insert title here</title>
</head>
<body><p>用Maven创建web项目，测试Servlet</p><a href="demo?action=login_input">登录(demo?action=login_input)</a>
</body>
</html>

5.创建login.jsp

<%@ 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>Insert title here</title>
</head>
<body><form action="demo?action=login" method="post">  Name:<input type="text" name="name" />  Password:<input type="password" name="password" />  <input type="submit" value="登录" />  </form>  
</body>
</html>