如何在springmvc中使用spring与mybatis实现一个用户登录功能?相信很多没有经验的人对此束手无策,为此本文总结了问题出现的原因和解决方法,通过这篇文章希望你能解决这个问题。
web.xml
<!-- Spring MVC 核心控制器 DispatcherServlet 配置 --> <servlet> <servlet-name>dispatcher</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <!--用于标明spring-mvc.xml配置的位置,我是存放在config文件夹下--> <param-name>contextConfigLocation</param-name> <param-value>classpath*:config/spring-mvc.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>dispatcher</servlet-name> <!-- 拦截所有*.do 的请求,交给DispatcherServlet处理,性能最好 --> <url-pattern>*.do</url-pattern> </servlet-mapping> <!--用于设定默认首页--> <welcome-file-list> <welcome-file>login.jsp</welcome-file> </welcome-file-list>
配置完后,我们需要在对springmvc框架进行配置,配置文件名为spring-mvc.xml,也是存放在config文件夹下:
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd"> <!--扫描控制器,当配置了它后,Spring会自动的到com.mjl.controller 下扫描带有@controller @service @component等注解等类,将他们自动实例化--> <context:component-scan base-package="com.mjl.controller" /> <!--<mvc:annotation-driven /> 会自动注册DefaultAnnotationHandlerMapping与 AnnotationMethodHandlerAdapter 两个bean,它解决了一些@controllerz注解使用时的提前配置--> <mvc:annotation-driven /> <!--配置 页面控制器--> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/"/> <property name="suffix" value=".jsp" /> </bean></beans>
当springmvc配置完成后,就需要编写业务啦,也就是service包下的东西,首先编写一个接口类userservice,里面存放了我们抽象出来的登录方法login
package com.mjl.service;import org.springframework.ui.Model;public interface UserService { public boolean login(String username,String password);}
然后在创建一个userservice的实现类userserviceimpl用于实现我们所抽象出来的登录方法
package com.mjl.service;import com.mjl.dao.IUserDao;import com.mjl.model.User;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Service;import org.springframework.ui.Model;//@Service("UserService") 注解用于标示此类为业务层组件,在使用时会被注解的类会自动由 //spring进行注入,无需我们创建实例@Service("UserService")public class UserServiceImpl implements UserService { //自动注入iuserdao 用于访问数据库 @Autowired IUserDao Mapper; //登录方法的实现,从jsp页面获取username与password public boolean login(String username, String password) {// System.out.println("输入的账号:" + username + "输入的密码:" + password); //对输入账号进行查询,取出数据库中保存对信息 User user = Mapper.selectByName(username); if (user != null) {// System.out.println("查询出来的账号:" + user.getUsername() + "密码:" + user.getPassword());// System.out.println("---------"); if (user.getUsername().equals(username) && user.getPassword().equals(password)) return true; } return false; }}
编写完业务层代码后,我们就可以写控制层代码啦,控制层的代码用于处理页面提交的业务
package com.mjl.controller;import com.mjl.model.User;import com.mjl.service.UserService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import javax.servlet.http.HttpServletRequest;//@Controller注解用于标示本类为web层控制组件@Controller//@RequestMapping("/user")用于标定访问时对url位置@RequestMapping("/user")//在默认情况下springmvc的实例都是单例模式,所以使用scope域将其注解为每次都创建一个新的实例@Scope("prototype")public class UserController { //自动注入业务层的userService类 @Autowired UserService userService; //login业务的访问位置为/user/login @RequestMapping("/login") public String login(User user,HttpServletRequest request){ //调用login方法来验证是否是注册用户 boolean loginType = userService.login(user.getUsername(),user.getPassword()); if(loginType){ //如果验证通过,则将用户信息传到前台 request.setAttribute("user",user); //并跳转到success.jsp页面 return "success"; }else{ //若不对,则将错误信息显示到错误页面 request.setAttribute("message","用户名密码错误"); return "error"; } }}
控制层代码写完后,就可以进行前端页面代码编写了,登录代码
<%-- Created by IntelliJ IDEA. User: alvin Date: 15/9/7 Time: 下午10:05 To change this template use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" %><% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><html><head> <title></title></head><body><br><br><br><br><br><form name="form1" action="/user/login.do" method="post" > <table width="300" border="1" align="center"> <tr> <td colspan="2">登入窗口</td> </tr> <tr> <td>用户名:</td> <td><input type="text" name="username"> </td> </tr> <tr> <td>密码:</td> <td><input type="password" name="password"/> </td> </tr> <tr> <td colspan="2"> <input type="submit" name="submit" value="登录"/> </td> </tr> </table></form></body></html>
登入成功代码
<%-- Created by IntelliJ IDEA. User: alvin Date: 15/9/8 Time: 下午6:21 To change this template use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" %><% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><html><head> <title></title></head><body>登入成功!<br>您好!${user.username}<br><a href="/login.jsp" rel="external nofollow" >返回</a></body></html>
登入失败代码
<%-- Created by IntelliJ IDEA. User: alvin Date: 15/9/8 Time: 下午6:22 To change this template use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" %><% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><html><head> <title></title></head><body>登入失败!${message}<br><a href="<%=path%>/login.jsp" rel="external nofollow" >返回</a></body></html>
看完上述内容,你们掌握如何在springmvc中使用spring与mybatis实现一个用户登录功能的方法了吗?如果还想学到更多技能或想了解更多相关内容,欢迎关注编程网行业资讯频道,感谢各位的阅读!