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 - leiOOlei - 博客园

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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>

OK，可以测试一下

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