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用Spring MVC实现用户登录的完整实例

佃成成成成 2023-06-09 阅读 53
springmvcimportstringbeanHarmonyOS后端开发


用Spring MVC实现用户登录的完整实例 本例子是再Eclipse中建立一个Tomcat工程,来讲解Spring MVC 的全过程,实例代码如下:
<一>编写日记文件放在myMVC/WEB-INF/src下

#指定日志输入文件的大小

log4j.appender.stdout.MaxFileSize=500KB

log4j.appender.stdout.MaxBackupIndex=50

log4j.appender.stdout.Append=true

log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

log4j.appender.stdout.layout.ConversionPattern=[%-5p]%d{yyyy-MM-ddHH:mm:ss}%c-%m%n

#定义log4j的显示方式

log4j.appender.A1=org.apache.log4j.RollingFileAppender

#指定日志输入文件的名称

log4j.appender.A1.File=org.log

#指定日志输入文件的大小

log4j.appender.A1.MaxFileSize=500KB

log4j.appender.A1.MaxBackupIndex=50

log4j.appender.A1.Append=true

log4j.appender.A1.layout=org.apache.log4j.PatternLayout

log4j.appender.A1.layout.ConversionPattern=%d{ISO8601}-[%P][%C{1}]-%m%n

#定义log4j的显示方式

log4j.appender.A1=org.apache.log4j.RollingFileAppender

#指定日志输入文件的名称

log4j.appender.A1.File=gc.log

#指定日志输入文件的大小

log4j.appender.gc.MaxFileSize=500KB

log4j.appender.gc.MaxBackupIndex=50

log4j.appender.gc.Append=true

log4j.appender.gc.layout=org.apache.log4j.PatternLayout

log4j.appender.gc.layout.ConversionPattern=%d{ISO8601}-[%P][%C{1}]-%m%n

<二>配置web.xml 

<?xml version="1.0" encoding="UTF-8"?> 
 

<web-app xmlns="http://java.sun.com/xml/ns/j2ee" 
 

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
 

version="2.4" 
 

xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
 

http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> 
 
<servlet> 
 

<servlet-name>dispatcherServlet</servlet-name> 
 

<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> 
 

<!-- 初始化参数 --> 
 

<init-param> 
 

<param-name>contextConfigLocation</param-name> 
 

<param-value>/WEB-INF/dispatcherServlet-servlet.xml</param-value> 
 

</init-param> 
 

</servlet> 
 

<servlet-mapping> 
 

<servlet-name>dispatcherServlet</servlet-name> 
 

<url-pattern>*.do</url-pattern> 
 

</servlet-mapping> 
 

<taglib> 
 

<taglib-uri>/spring</taglib-uri> 
 

<taglib-location>/WEB-INF/spring.tld</taglib-location> 
 

</taglib> 
 

<welcome-file-list> 
 

<welcome-file>index.jsp</welcome-file> 
 

</welcome-file-list> 
 

</web-app>




<三>编写登录页面myMVC/gc/jsp目录下login.jsp 

<%@taglib prefix="spring" uri="/spring"%> 
 

<%@ page contentType="text/html;charset=GBK"%> 
 

<html> 
 

<head><title><spring:message code="title"/></title></head> 
 

<body> 
 

<form action="/myMVC/login.do" name="User" method="post"> 
 

<spring:bind path="command.username"> 
 

<spring:message code="username"></spring:message> 
 

<input type="text" name="${status.expression }"value="${status.value }"/> 
 

<br> 
 

<font color="red"><b>${status.errorMessage }</b></font><br> 
 

</spring:bind> 
 

<spring:bind path="command.password"> 
 

<spring:message code="password"></spring:message> 
 

<input type="password" name="${status.expression }"value="${status.value }"/> 
 

<br> 
 

<font color="red"><b>${status.errorMessage }</b></font><br> 
 

</spring:bind> 
 

<spring:bind path="command.password2"> 
 

<spring:message code="password2"></spring:message> 
 

<input type="password" name="${status.expression }"value="${status.value }"/> 
 

<br> 
 

<font color="red"><b>${status.errorMessage }</b></font><br> 
 

</spring:bind> 
 

<input type="submit" value="<spring:messagecode='submit'/>"/> 
 

</form> 
 

</body> 
 

</html>




<四>编写显示成功的页面myMVC/gc/jsp目录下success.jsp 

<%@taglib prefix="spring" uri="/spring"%> 
 

<%@page contentType="text/html;charset=GBK"%> 
 

<html> 
 

<head><title><spring:message code="title"></spring:message></title></head> 
 

<body> 
 

<spring:bind path="command.username"> 
 

<h3><spring:message code="welcome"></spring:message>{status.value }<spring:message code="loginSuccess"/></h3><br> 
 

</spring:bind> 
 

</body> 
 

</html>




<五>编写存放用户登录信息的Bean,在com.gc.action包中建立Java文件User.java 

package com.gc.action; 
 

publicclass User { 
 

private String username=null; 
 

private String password=null; 
 

private String password2=null; 
 

public String getPassword() { 
 

returnpassword; 
 

} 
 

publicvoid setPassword(String password) { 
 

this.password = password; 
 

} 
 

public String getPassword2() { 
 

returnpassword2; 
 

} 
 

publicvoid setPassword2(String password2) { 
 

this.password2 = password2; 
 

} 
 

public String getUsername() { 
 

returnusername; 
 

} 
 

publicvoid setUsername(String username) { 
 

this.username = username; 
 

} 
 

}




<六>在com.gc.action包下编写用户验证类UserValidator.java 

package com.gc.action; 
 

import com.gc.action.User; 
 

import org.springframework.validation.Validator; 
 

import org.springframework.validation.Errors; 
 

publicclass UserValidator implements Validator { 
 

publicboolean supports(Class clazz){ 
 

return clazz.equals(User.class); 
 

} 
 

publicvoid validate(Object obj,Errors errors){ 
 

User user=(User)obj; 
 

if(!"tang".equals(user.getUsername())){ 
 

errors.rejectValue("username", "usernameerror", null, "用户名不正确"); 
 

} 
 

if(!"123456".equals(user.getPassword())){ 
 

errors.rejectValue("password", "passworderror", null, "密码不正确"); 
 

} 
 

if(!user.getPassword().equals(user.getPassword2())){ 
 

errors.rejectValue("password2", "password2error", null, "2次输入密码不一致"); 
 

} 
 

} 
 

}




<七>在com.gc.action包下编写用户登录逻辑Login.java 

package com.gc.action; 
 

import java.util.Map; 
 

import org.apache.log4j.Logger; 
 

import org.springframework.validation.BindException; 
 

import org.springframework.web.servlet.ModelAndView; 
 

import org.springframework.web.servlet.mvc.SimpleFormController; 
 

publicclass Login extends SimpleFormController{ 
 

private Logger logger=Logger.getLogger(this.getClass().getName()); 
 

public ModelAndView onSubmit(Object command,BindException errors)throws Exception{ 
 

User user=(User)command; 
 

Map modle=errors.getModel(); 
 

modle.put("user", user); 
 

returnnew ModelAndView(getSuccessView(),modle); 
 

} 
 

}




<八>myMVC/WEB-INF目录下编写配置文件dispatcherServlet-servlet.xml 

<?xml version="1.0" encoding="UTF-8"?> 
 

<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" 
 

"http:www.springframework.org/dtd/spring-bean.dtd"> 
 

<beans> 
 

<!-- 定义国际化消息 --> 
 

<bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource"> 
 

<property name="basename"> 
 

<value>messages</value> 
 

</property> 
 

</bean> 
 

<!-- 定义映射 --> 
 

<bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"> 
 

<property name="mapping"> 
 

<props> 
 

<prop key="login.do">login</prop> 
 

</props> 
 

</property> 
 

</bean> 
 

<!-- 定义视图及路径 --> 
 

<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> 
 

<property name="viewClass"> 
 

<value>org.springframework.web.servlet.view.InternalResourceView</value> 
 

</property> 
 

<!-- JSP都放在WEB-INF/jsp目录下 --> 
 

<property name="prefix"> 
 

<value>/WEB-INF/jsp</value> 
 

</property> 
 

<!-- JSP页面的后缀都四.JSP --> 
 

<property name="suffix"> 
 

<value>.jsp</value> 
 

</property> 
 

</bean> 
 

<!-- 定义控制器 --> 
 

<bean id="login" class="com.gc.action.Login"> 
 

<property name="commandClass"> 
 

<value>com.gc.action.User</value> 
 

</property> 
 

<!-- 指定验证类 --> 
 

<property name="validator"> 
 

<ref bean="userValidator"/> 
 

</property> 
 

<!-- 指定失败要返回的页面 --> 
 

<property name="formView"> 
 

<value>login</value> 
 

</property> 
 

<property name="successView"> 
 

<value>success</value> 
 

</property> 
 

</bean> 
 

<!-- 定义验证类 --> 
 

<bean id="userValidator" class="com.gc.action.UserValidator"></bean> 
 

</beans>




<九>myMVC/WEB-INF/src目录下编写资源文件messages.properties及messages_en_US.properties
messages.properties

title=SpringMVC实例

username=输入用户名:

password=输入密码:

password2=确认密码:

submit=提交

welcome=欢迎

loginSuccess=登录成功

usernameerror=用户名不正确

passworderror=密码不正确

doublepassword=2次密码不一致
native2ascii工具转码后 

title=SpringMVC/u5b9e/u4f8b 
 

username=/u8f93/u5165/u7528/u6237/u540d: 
 

password=/u8f93/u5165/u5bc6/u7801: 
 

password2=/u786e/u8ba4/u5bc6/u7801: 
 

submit=/u63d0/u4ea4 
 

welcome=/u6b22/u8fce 
 

loginSuccess=/u767b/u5f55/u6210/u529f 
 

usernameerror=/u7528/u6237/u540d/u4e0d/u6b63/u786e 
 

passworderror=/u5bc6/u7801/u4e0d/u6b63/u786e 
 

doublepassword=2/u6b21/u5bc6/u7801/u4e0d/u4e00/u81f4 
 
messages_en_US.properties 
 


title=SpringMVC 
 

username=username 
 

password=password 
 

password2=password2 
 

submit=submit 
 

welcome=welcome 
 

loginSuccess=loginSuccess 
 

usernameerror=usernameerror 
 

passworderror=passworderror 
 

doublepassword=doublepassworderror



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