spring+springmvc+mybatis+mysql实现登录功能（下）

之前的项目已经实现spring与mybatis的整合，接下来需要实现springmvc的整合工作。首先得在web.xml中配置springmvc的前端控制器DispatcherServlet，它是springmvc的核心，为springmvc提供集中访问点，springmvc对页面的分派与调度功能主要靠它完成。在我们之前配置的web.xml中加入以下springmvc的配置：

<!-- Spring MVC 核心控制器 DispatcherServlet (为springmvc提供集中访问点，springmvc对页面的分派与调度

功能主要靠它完成。)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>

2.需要在config文件夹中添加spring-mvc.xml文件。代码为：

<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.yy.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.yy.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>

3.。当springmvc配置完成后，就需要编写业务，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.yy.service;import  org.springframework.ui.Model;/** * Created by yy on 2017/9/6. 业务层 */public interface UserService {    public  boolean login(String username,String password);}

4.。对service接口进行实现。

package com.yy.service;import com.yy.dao.IUserDao;import com.yy.model.User;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import org.springframework.context.annotation.Scope;import org.springframework.ui.Model;/** * Created by yy on 2017/9/6. *///@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;      }}

5.。写控制层代码，控制层的代码用于处理页面提交的业务 

package com.yy.controller;import com.yy.model.User;import com.yy.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;/** * Created by yy on 2017/9/6. *///@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 "fail";        }    }}

6.。登录首页jsp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>

7.。登录成功jsp

<%--  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">返回</a></body></html>

8.。登录失败jsp

<%--  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">返回</a></body></html>