本文介绍如何使用SpringMVC框架实现用户注册和登录功能，包括项目搭建、页面设计、控制器编写及日志配置等关键步骤。
使用SpringMVC实现用户注册和登录的小例子
1.新建Dynamic Web Project，名称RequestMappingTest
2.导入jar包
3.添加相关文件
4.文件代码
loginForm.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>登录页面</title>
</head>
<body>
<h3>登录页面</h3>
<br>
<form action="login" method="post">
<table>
<tr>
<td><label>登录名：</label></td>
<td><input type="text" id="loginname" name="loginname"></td>
</tr>
<tr>
<td><label>密码：</label></td>
<td><input type="password" id="password" name="password"></td>
</tr>
<tr>
<td><input id="submit" type="submit" value="登录"></td>
</tr>
</table>
</form>
</body>
</html>
registerForm.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>注册页面</title>
</head>
<body>
<h3>注册页面</h3>
<br>
<form action="register" method="post">
<table>
<tr>
<td><label>登录名：</label></td>
<td><input type="text" id="loginname" name="loginname"></td>
</tr>
<tr>
<td><label>密码：</label></td>
<td><input type="password" id="password" name="password"></td>
</tr>
<tr>
<td><label>真实姓名：</label></td>
<td><input type="text" id="username" name="username"></td>
</tr>
<tr>
<td><input id="submit" type="submit" value="注册"></td>
</tr>
</table>
</form>
</body>
</html>
welcom.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>登陆成功页面</title>
</head>
<body>
<h3>欢迎${requestScope.user.username }登录</h3>
<br>
</body>
</html>
springmvc-config.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:mvc="www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.2.xsd">
<context:component-scan base-package="org.fkit.controller"/>
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/WEB-INF/context/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
</beans>
web.xml
<?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"
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
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>RequestMappingTest</display-name>
<context-param>
<param-name>log4jConfiguration</param-name>
<param-value>classpath:log4j2.xml</param-value>
</context-param>
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/springmvc-config.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<!-- servlet映射声明 -->
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<filter>
<filter-name>characterEncodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>characterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>
UserController.java
package org.fkit.controller;
import java.util.ArrayList;
import java.util.List;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.fkit.domain.User;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
@Controller
@RequestMapping(value="user")
public class UserController {
//静态List<User>集合，此处代替数据库用来保存注册的用户信息
private static List<User> userList;
//UserController类的构造器，初始化List<User>集合
public UserController(){
super();
userList = new ArrayList<User>();
}
//静态日之类loggerMaggent
private static final Logger logger = LogManager.getLogger(UserController.class.getName());
@RequestMapping(value="/register",method=RequestMethod.GET)
public String registerForm(){
logger.info("register GET 方法被调用……");
return "registerForm";
}
@RequestMapping(value="/register",method=RequestMethod.POST)
public String register(@RequestParam("loginname")String loginname,
@RequestParam("password")String password,
@RequestParam("username")String username){
logger.info("register POST 方法被调用……");
//创建user对象
User user = new User();
user.setLoginname(loginname);
user.setPassword(password);
user.setUsername(username);
//模拟数据库存储User信息
userList.add(user);
return "loginForm";
}
//登录
@RequestMapping("/login")
public String login(@RequestParam("loginname")String loginname,
@RequestParam("password")String password,Model model){
logger.info("登录名："+loginname+" 密码："+password);
//到集合中查找用户是否存在，此处用来模拟数据库验证
for(User user:userList){
if(user.getLoginname().equals(loginname) && user.getPassword().equals(password)){
model.addAttribute("user", user);
return "welcome";
}
}
return "loginForm";
}
}
User.java
package org.fkit.domain;
public class User {
private String loginname;
private String password;
private String username;
public String getLoginname() {
return loginname;
}
public void setLoginname(String loginname) {
this.loginname = loginname;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
}
log4j2.xml
<?xml version="1.0" encoding="UTF-8"?>
<configuration status="debug">
<Properties>
<Property name="LOG_HOME">${sys:catalina.base}/var/logs</Property>
<Property name="APP_LOG_HOME">${LOG_HOME}/requestMappingTest</Property>
</Properties>
<Appenders>
<Console name="Console" target="SYSTEM_OUT">
<!-- 控制台只输出level及以上级别的信息(onMatch),其他的直接拒绝(onMismatch) -->
<!-- <ThresholdFilter level="debug" onMatch="ACCEPT" onMismatch="DENY"
/> -->
<!-- 输出日志的格式 -->
<PatternLayout
pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} %-5level %class{36} %L %M - %msg%xEx%n" />
</Console>
<RollingFile name="requestMappingTest_appender"
immediateFlush="true" fileName="${APP_LOG_HOME}/requestMappingTest.log"
filePattern="${APP_LOG_HOME}/requestMappingTest.log.%d{yyyy-MM-dd}.gz">
<!-- %d{yyyy-MM-dd HH:mm:ss, SSS} : 日志生产时间 %p : 日志输出格式 %c : logger的名称
%m : 日志内容，即 logger.info("message") %n : 换行符 %C : Java类名 %L : 日志输出所在行数 %M
: 日志输出所在方法名 hostName : 本地机器名 hostAddress : 本地ip地址 -->
<PatternLayout>
<pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} %-5level %class{36} %L %M --
%msg%xEx%n</pattern>
</PatternLayout>
<Policies>
<TimeBasedTriggeringPolicy interval="1"
modulate="true" />
</Policies>
<!-- 最多备份30天以内的日志，此处为策略限制，Delete中可以按自己需要用正则表达式编写 -->
<!-- DefaultRolloverStrategy字段中加入max=“30”经测试是配合SizeBasedTriggeringPolicy限制%i的存在数量，并没有发现是网上流传的是最多保存多少个文件的限制，也或许是我写的有问题 -->
<DefaultRolloverStrategy>
<Delete basePath="${APP_LOG_HOME}" maxDepth="1">
<IfFileName glob="requestMappingTest.log.*.gz" />
<IfLastModified age="1d" />
</Delete>
</DefaultRolloverStrategy>
</RollingFile>
</Appenders>
<Loggers>
<logger name="org.spring" level="debug" additivity="false">
<AppenderRef ref="Console" />
<AppenderRef ref="requestMappingTest_appender" />
</logger>
<logger name="org.springframework" level="debug" additivity="false">
<AppenderRef ref="Console" />
<AppenderRef ref="requestMappingTest_appender" />
</logger>
<!-- <logger name="org.apache.zookeeper" level="info" additivity="false">
<AppenderRef ref="Console" />
<AppenderRef ref="requestMappingTest_appender" />
</logger>
<logger name="com.alibaba.dubbo" level="info" additivity="false">
<AppenderRef ref="Console" />
<AppenderRef ref="requestMappingTest_appender" />
</logger> -->
<logger name="org.fkit" level="info" additivity="false">
<AppenderRef ref="Console" />
<appender-ref ref="requestMappingTest_appender" />
</logger>
<root level="debug" includeLocation="true">
<appender-ref ref="Console" />
<appender-ref ref="requestMappingTest_appender" />
</root>
</Loggers>
</configuration>
5.界面
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