在上一篇博客裏介紹瞭如何使用Maven構建一個Web項目，這裏寫一個簡單的Servlet，測試一下。
1.在pom.xml裏面添加Servlet的依賴。
<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.carson.demo</groupId>
<artifactId>test01</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>test01 Maven Webapp</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.9</version>
<scope>test</scope>
</dependency>
<!-- 添加Servlet -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>3.0-alpha-1</version>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<finalName>test01</finalName>
</build>
</project>2.在src/main/java下，新建一個Servlet。
package com.carson.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class UserServlet
*/
@WebServlet("/userServlet")
public class UserServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* Default constructor.
*/
public UserServlet() {
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request,response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=utf-8");
String username = request.getParameter("username");
String password = request.getParameter("password");
System.out.println("name->" + username + ",password->" + password);
if("admin".equals(username) && "123456".equals(password)) {
request.getRequestDispatcher("index.jsp").forward(request , response);
} else{
response.sendRedirect("login.jsp");
}
}
}<strong>
</strong><?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>
<!-- 使用annotation不需要再配置 -->
<!-- <servlet>
<servlet-name>UserServlet</servlet-name>
<servlet-class>com.carson.servlet.UserServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>UserServlet</servlet-name>
<url-pattern>/userServlet</url-pattern>
</servlet-mapping> -->
<welcome-file-list>
<welcome-file>login.jsp</welcome-file>
</welcome-file-list>
</web-app>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>登錄界面</title>
</head>
<body>
<form action="userServlet" method="post">
<table>
<tr>
<td>用戶名：</td>
<td><input type="text" name="username" /> </td>
</tr>
<tr>
<td>密碼：</td>
<td><input type="text" name="password" /> </td>
</tr>
<tr>
<td colspan="2">
<input type="submit" value="登錄" />
<input type="reset" value="重置" /></td>
</tr>
</table>
</form>
</body>
</html> <%@ 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>Hello Maven</title>
</head>
<body>
<p>大家好，歡迎進入Maven Web應用！</p>
</body>
</html>
項目結構如下所示：
最後說一句，使用Servlet的annotation引入@WebServlet("/userServlet")報javax.servlet.annotation.WebServlet找不到包。
解決方法：右擊項目名--buildpath--add library--Server runtime改爲tomcat7.0。