0
点赞
收藏
分享

微信扫一扫

用Spring MVC实现用户登录的完整实例

佃成成成成 2023-06-09 阅读 58
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



举报

相关推荐

基于spring boot实现用户登录

javaspring boot

Spring Security 实现用户名密码登录

SpringSpring Security

vue实现用户登录功能

vue.js前端

Java案例实现用户登录

java开发语言后端

Java实现用户注册与登录

UserList用户名Java后端开发我的新年Flag

java Web实现用户登录功能

java前端servlet

vue实现用户动态权限登录

vue.jsjavascriptecmascript

Spring boot框架 JWT实现用户账户密码登录验证

websocketpythonflask

Java开发：实现用户注册登录的功能

ajax数据库验证码Java编程语言

django实现用户的注册、登录、注销功能

djangopython后端
0 条评论