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>

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

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