Maven3 用Maven创建第一个web项目(2)servlet演示

2022-11-18 10:44:19

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.france.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.france.demo;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

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.france.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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