转载:Spring MVC +MyBatis +MySQL 登录查询Demo

忙活了大半天,饭也没顾得上吃,哎许久不动手,一动手就出事,下面请看今天的重头戏,额吃个饭回来再发了!


1.整体结构


wKiom1PaQ5WhafnZAANzSUEfMS8143.jpg


2.准备工作

数据库:

--Mysql 5.6


创建数据库 wolf

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CREATE  DATABASE  wolf;

创建用户表 user

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create  table  user (
id  int   AUTO_INCREMENT   primary  key ,
name  varchar (25)  not  null ,
pwd  varchar (20)  not  null ,
create_time  date
)

向表中插入测试数据

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insert  into  user ( name ,pwd,create_time)  values ( "wangxin" , "123" , "2014-02-14" );
insert  into  user ( name ,pwd,create_time)  values ( "Tom" , "123456" , "2014-02-14" );
insert  into  user ( name ,pwd,create_time)  values ( "Jack" , "123" , "2014-02-14" );
insert  into  user ( name ,pwd,create_time)  values ( "Bob" , "123" , "2014-02-14" );

 


所需Jar包

我们先文字,后图吧j_0059.gif,细心的你,看完所有内容会发现,这里的东西在哪里也有哦,别想多了,肯定在这里,你猜猜猜..j_0028.gif


jar:

1.驱动:mysql-connector-java-5.1.7-bin.jar

2.jstl 的

jstl.jar

standard.jar

 3.spring 的

 spring-aop-4.0.0.M2.jar

 spring-beans-4.0.0.M2.jar

 spring-context-4.0.0.M2.jar

 spring-core-4.0.0.M2.jar 

                (若出现问题,可以替换 spring-core-4.0.0.RELEASE.jar)

 spring-expression-4.0.0.M2.jar

 spring-jdbc-4.0.0.M2.jar

 spring-test-4.0.0.M2.jar

 spring-tx-4.0.0.M2.jar

 4.mybatis 的 

 mybatis-3.1.1.jar

 log4j-1.2.16.jar

 mybatis-spring-1.2.1.jar

 5.以及spring-depend 

 aopalliance-1.0.jar

 cglib-nodep-2.1_3.jar

 commons-logging-1.1.1.jar

 6.web 相关的

 spring-web-4.0.0.RELEASE.jar

 spring-webmvc-4.0.0.RELEASE.jar

 


下面是jar包在项目中的结构图

wKiom1PaTuPz-pKsAAHgWEaJc2U528.jpg


3.项目代码及简析

Bean类 

User.java

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package  com.springmvc_mybatis.bean;
 
import  java.io.Serializable;
import  java.util.Date;
import  org.springframework.format.annotation.DateTimeFormat;
 
public  class  User  implements  Serializable {
     
     private  static  final  long  serialVersionUID = 1L;
     private  Integer id;
     private  String name;
     private  String password;
 
     @DateTimeFormat (pattern =  "yyyy-MM-dd" )
     private  Date time;
 
     public  User() {
         super ();
     }
 
     public  User(String name, String password) {
         super ();
         this .name = name;
         this .password = password;
     }
 
     public  User(Integer id, String name, String password, Date time) {
         super ();
         this .id = id;
         this .name = name;
         this .password = password;
         this .time = time;
     }
 
     public  Integer getId() {
         return  id;
     }
 
     public  void  setId(Integer id) {
         this .id = id;
     }
 
     public  String getName() {
         return  name;
     }
 
     public  void  setName(String name) {
         this .name = name;
     }
 
     public  String getPassword() {
         return  password;
     }
 
     public  void  setPassword(String password) {
         this .password = password;
     }
 
     public  Date getTime() {
         return  time;
     }
 
     public  void  setTime(Date time) {
         this .time = time;
     }
 
     @Override
     public  String toString() {
         return  "User [id="  + id +  ", name="  + name +  ", password="  + password
                 ", time="  + time +  "]" ;
     }
}

接口(如果你用了mappers 那么接口以及配置文件最后都带有Mapper,且名字一致)
UserMapper.java

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package  com.springmvc_mybatis.mapper;
 
import  java.util.List;
import  org.apache.ibatis.annotations.Param;
import  com.springmvc_mybatis.bean.User;
 
//userMapper只能传入一个参数,多个的话需要注解
public  interface  UserMapper {
     // value 必须与Bean 属性一致!
     User login( @Param (value =  "name" ) String name,
             @Param (value =  "password" ) String password);
 
     List<User> getAllUsers();
}

UserMapper.xml

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<? xml  version = "1.0"  encoding = "UTF-8"  ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
< mapper  namespace = "com.springmvc_mybatis.mapper.UserMapper" >
     < resultMap  type = "User"  id = "userResult" >
         < result  column = "id"  property = "id"  />
         < result  column = "name"  property = "name"  />
         < result  column = "pwd"  property = "password"  />
         < result  column = "create_time"  property = "time"  />
     </ resultMap >
     < select  id = "login"  resultMap = "userResult" >
         select * from
         user
         where
         name=#{name}
         and pwd=#{password}
     </ select >
 
     < select  id = "getAllUsers"  resultMap = "userResult" >
         select *
         from user
     </ select >
</ mapper >
<!-- error ,,,,resultMap wrong to resultType... -->

下面该干嘛了?╮(╯▽╰)╭好吧,我们先来配置下在木有服务器的环境下,看看Mybatis是否能正确运行。

所以我们先来配置哪个呢?

哦是她,


spring 配置

beans_wolf.xml 哈哈,wolf 哦,够那个啥吧。。。j_0058.gif

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<? xml  version = "1.0"  encoding = "UTF-8" ?>
< beans  xmlns = "http://www.springframework.org/schema/beans" 
     xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
     xmlns:p = "http://www.springframework.org/schema/p" 
     xmlns:context = "http://www.springframework.org/schema/context"
     xmlns:tx = "http://www.springframework.org/schema/tx"
     xsi:schemaLocation="
         http://www.springframework.org/schema/beans
         http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
         http://www.springframework.org/schema/context
         http://www.springframework.org/schema/context/spring-context-3.2.xsd
         http://www.springframework.org/schema/tx
         http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">
     <!-- 1. 数据源 : DriverManagerDataSource -->
     < bean  id = "datasource"  class = "org.springframework.jdbc.datasource.DriverManagerDataSource" >
         < property  name = "driverClassName"  value = "com.mysql.jdbc.Driver" />
         < property  name = "url"  value = "jdbc:mysql://localhost:3307/wolf" />
         < property  name = "username"  value = "root" />
         < property  name = "password"  value = "root" />
     </ bean >
     
     <!-- 
         2. mybatis的SqlSession的工厂: SqlSessionFactoryBean 
             dataSource / typeAliasesPackage
     -->
     < bean  id = "sqlSessionFactory"  class = "org.mybatis.spring.SqlSessionFactoryBean" >
         < property  name = "dataSource"  ref = "datasource" />
         < property  name = "typeAliasesPackage"  value = "com.springmvc_mybatis.bean" />
         < property  name = "configLocation"  value = "classpath:mybatis-config.xml"  />
     </ bean >
 
     <!-- 
         3. mybatis自动扫描加载Sql映射文件 : MapperScannerConfigurer 
             sqlSessionFactory / basePackage
     -->
     < bean   class = "org.mybatis.spring.mapper.MapperScannerConfigurer" >
         < property  name = "basePackage"  value = "com.springmvc_mybatis.mapper" />
         < property  name = "sqlSessionFactory"  ref = "sqlSessionFactory" />
     </ bean >
     
     <!-- 4. 事务管理 : DataSourceTransactionManager -->
     < bean  id = "manager"  class = "org.springframework.jdbc.datasource.DataSourceTransactionManager" >
         < property  name = "dataSource"  ref = "datasource" />
     </ bean >
 
     <!-- 5. 使用声明式事务 -->
     < tx:annotation-driven  transaction-manager = "manager"  />
</ beans >

Spring 基本配置都在上面咯,数据库如果想读入配置文件的话,自己新建属性文件配置下下了

 


哦,差点过了,现在我们就可以来测试下咯,后面的mvc配置主要是为web服务的哈,不急!!

TestSimpleMyBatis.java

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package  com.springmvc_mybatis.test;
 
import  java.util.List;
 
import  org.junit.Test;
import  org.junit.runner.RunWith;
import  org.springframework.beans.factory.annotation.Autowired;
import  org.springframework.test.context.ContextConfiguration;
import  org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 
import  com.springmvc_mybatis.bean.User;
import  com.springmvc_mybatis.mapper.UserMapper;
 
@RunWith (SpringJUnit4ClassRunner. class )
@ContextConfiguration ( "/beans_wolf.xml" )
public  class  TestSimpleMyBatis {
 
     @Autowired
     private  UserMapper userMapper;
 
     @Test
     public  void  findAll() {
         List<User> users = userMapper.getAllUsers();
         System.out.println(users);
     }
 
     @Test
     public  void  login() {
         // User user = new User(null, "wx", "123456", new Date());
         // User user = new User(null, "wangxin", "123456", new Date());
         // User loginExit = userMapper.login(user);
         // User loginExit = userMapper.login("wx", "123456");
         User loginExit = userMapper.login( "wangxin" "123456" );
         if  (loginExit ==  null ) {
             System.out.println( "用户不存在" );
         else  {
             System.out.println(loginExit);
             System.out.println( "登录成功!" );
         }
     }
}

如果你成功了,恭喜你可以继续咯!如果出现问题那么尝试在配置一个哈,

mybatis-config.xml,特意把她放到下下个咯,就看你细心嘛j_0003.gif

Let`s go...


applicationContext-mvc.xml

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<? xml  version = "1.0"  encoding = "UTF-8" ?>
< beans  xmlns = "http://www.springframework.org/schema/beans"
     xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"  xmlns:context = "http://www.springframework.org/schema/context"
     xmlns:mvc = "http://www.springframework.org/schema/mvc"
     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">
 
     <!-- Scans the classpath of this application for @Components to deploy as 
         beans -->
     < context:component-scan  base-package = "com.springmvc_mybatis.controller"  />
 
     <!-- Configures the @Controller programming model -->
     < mvc:annotation-driven  />
 
     <!-- Resolves view names to protected .jsp resources within the /WEB-INF/views 
         directory -->
     < bean  id = "viewResolver"
         class = "org.springframework.web.servlet.view.InternalResourceViewResolver" >
         < property  name = "prefix"  value = "/WEB-INF/test/"  />
         < property  name = "suffix"  value = ".jsp"  />
     </ bean >
</ beans >

mybatis-config.xml

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<? xml  version = "1.0"  encoding = "UTF-8"  ?>
<!DOCTYPE configuration
   PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
   "http://mybatis.org/dtd/mybatis-3-config.dtd">
 
< configuration >
     <!-- Spring整合myBatis后,这个配置文件基本可以不要了 -->
     <!-- 设置外部配置文件 -->
     <!-- 设置类别名 -->
     < typeAliases >
     < typeAlias  type = "com.springmvc_mybatis.bean.User"  alias = "User"  />
</ typeAliases >
     <!-- 设置数据库连接环境 -->
     <!-- 映射文件 -->
     < mappers >
         < mapper  resource = "com/springmvc_mybatis/mapper/userMapper.xml"  />
     </ mappers >
</ configuration >

到此配置工作基本完成了,为了页面数据提交和查找,再弄个Handler吧,这个也可以叫做Controller吧,反正都是流程数据处理的哈

UserController.java

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package  com.springmvc_mybatis.controller;
 
import  java.util.List;
 
import  javax.servlet.http.HttpServletRequest;
 
import  org.springframework.beans.factory.annotation.Autowired;
import  org.springframework.stereotype.Controller;
import  org.springframework.ui.Model;
import  org.springframework.web.bind.annotation.RequestMapping;
 
import  com.springmvc_mybatis.bean.User;
import  com.springmvc_mybatis.mapper.UserMapper;
 
@Controller
@RequestMapping ( "/user" )
public  class  UserController {
 
     @Autowired
     private  UserMapper usermapper;
 
     @RequestMapping ( "/login" )
     public  String login(HttpServletRequest request, Model model) {
         String name = request.getParameter( "username" );
         String password = request.getParameter( "password" );
         System.out.println( "login" );
         User user_login = usermapper.login(name, password);
         System.out.println(user_login);
         if  (user_login ==  null ) {
             System.out.println( "Error login!" );
             return  "fail" ;
         else  {
             model.addAttribute( "user" , user_login);
             return  "success" ;
         }
     }
 
     @RequestMapping ( "/list" )
     public  String getAllUsers(Model model) {
         List<User> users = usermapper.getAllUsers();
         model.addAttribute( "users" , users);
         System.out.println(users);
         return  "list" ;
 
     }
}

下面我们该弄什么咯???

前端显示了,当然是。

先给出结构图吧,挺简单的!

wKiom1PaVlnQrzeXAAFOE8M200Y716.jpg

你,你,看到了神马j_0016.gif,jre8,Tomcat 8 ,j_0004.gif

神啊,你未来来的吧,我还在5,啊,6啊,7都少用,你都,,,,,j_0081.gif

 


WEB

index.jsp

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<jsp:forward page= "/WEB-INF/test/login.jsp" ></jsp:forward>

j_0009.gif这么长啊,我的神。。。

 

login.jsp

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<%@ page language= "java"  contentType= "text/html; charset=UTF-8"
     pageEncoding= "UTF-8" %>
<!DOCTYPE html PUBLIC  "-//W3C//DTD HTML 4.01 Transitional//EN"  "http://www.w3.org/TR/html4/loose.dtd" >
<html>
<head>
<meta http-equiv= "Content-Type"  content= "text/html; charset=UTF-8" >
<title>login</title>
</head>
<body>
     <form action= "user/login.action"  method= "post" >
         <table align= "left" >
            <tr>
                 <td>用户名:</td>
                 <td><input id= "userName"  type= "text"  name= "username" ></td>
            </tr>
                <tr>
                <td>密码:</td>
                <td><input id= "password"  type= "password"  name= "password" ></td>
           </tr>
            <tr>
                <td><button type= "submit"  name= "Submit" >登录</button></td>
               </tr>
            </table>
     </form>
</body>
</html>

success.jsp 登录成功

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<%@ page language= "java"  contentType= "text/html; charset=UTF-8"
     pageEncoding= "UTF-8" %>
<!DOCTYPE html PUBLIC  "-//W3C//DTD HTML 4.01 Transitional//EN"  "http://www.w3.org/TR/html4/loose.dtd" >
<html>
<head>
<meta http-equiv= "Content-Type"  content= "text/html; charset=UTF-8" >
<title>Success</title>
</head>
<body>
     Welcome
     <font color= "red" >${requestScope.user.name} </font>!
     <br>
     <br>
     <a href= "list.action" >用户信息列表</a>
</body>
</html>

fail.jsp

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<%@ page language= "java"  contentType= "text/html; charset=UTF-8"
     pageEncoding= "UTF-8" %>
<!DOCTYPE html PUBLIC  "-//W3C//DTD HTML 4.01 Transitional//EN"  "http://www.w3.org/TR/html4/loose.dtd" >
<html>
<head>
<meta http-equiv= "Content-Type"  content= "text/html; charset=UTF-8" >
<title>Insert title here</title>
</head>
<body>
     <h3>
         <font color= "red" >fail login!</font>
     </h3>
     <h2>
         <a href= "${pageContext.request.contextPath}" > return  the Login
             Page!</a>
     </h2>
</body>
</html>

list.jsp

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<%@ page language= "java"  contentType= "text/html; charset=UTF-8"
     pageEncoding= "UTF-8" %>
<%@ taglib prefix= "c"  uri= "http://java.sun.com/jsp/jstl/core" %>
<%@taglib prefix= "fmt"  uri= "http://java.sun.com/jsp/jstl/fmt" %>
<%@taglib prefix= "spring"  uri= "http://www.springframework.org/tags" %>
<!DOCTYPE html PUBLIC  "-//W3C//DTD HTML 4.01 Transitional//EN"  "http://www.w3.org/TR/html4/loose.dtd" >
<html>
<head>
<meta http-equiv= "Content-Type"  content= "text/html; charset=UTF-8" >
<title>Insert title here</title>
</head>
<body>
     <c: if  test= "${empty requestScope.users }" >
         <font color= "red" >没有员工信息!</font>
     </c: if >
     <c: if  test= "${!(empty requestScope.users)}" >
         <table border= "1"  cellpadding= "10"  cellspacing= "0" >
             <tr>
                 <th>Num</th>
                 <th>Id</th>
                 <th>Name</th>
                 <th>Create_Time</th>
                 <th>Password</th>
                 <th colspan= "2" >OP</th>
             </tr>
             <c:forEach items= "${requestScope.users }"  var = "user"  varStatus= "s" >
                 <tr>
                     <td>${s.count}</td>
                     <td>${user.id}</td>
                     <td>${user.name }</td>
                     <td><fmt:formatDate value= "${user.time}"  pattern= "yyyy-MM-dd"  />
                     </td>
                     <td>${user.password}</td>
                     <td><a onclick= "return false"
                         href= "${pageContext.request.contextPath}/user/save.action?id=${user.id}" ><font
                             color= "blue" >edit</font></a></td>
                     <td><a onclick= "return false"
                         href= "${pageContext.request.contextPath}/user/delete/${user.id}.action" ><font
                             color= "blue" > delete </font></a></td>
                 </tr>
             </c:forEach>
         </table>
     </c: if >
     
     <br>
     <a href= "${pageContext.request.contextPath}" >goto login</a>
</body>
</html>

页面终于完蛋了,,但是能运行吗????????

好像少了个吧

 


web.xml

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<? xml  version = "1.0"  encoding = "UTF-8" ?>
< web-app  xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
     xmlns = "http://java.sun.com/xml/ns/javaee"
     xsi:schemaLocation = "http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
     id = "WebApp_ID"  version = "2.5" >
     < display-name >Demo_SpringMVC_MyBatis</ display-name >
     < context-param >
         < param-name >contextConfigLocation</ param-name >
         < param-value >classpath:beans_wolf.xml</ param-value >
     </ context-param >
     < listener >
         < listener-class >org.springframework.web.context.ContextLoaderListener</ listener-class >
     </ listener >
     < servlet >
         < servlet-name >springDispatcherServlet</ servlet-name >
         < servlet-class >org.springframework.web.servlet.DispatcherServlet</ servlet-class >
         < init-param >
             < param-name >contextConfigLocation</ param-name >
             < param-value >classpath:applicationContext-mvc.xml</ param-value >
         </ init-param >
         < load-on-startup >1</ load-on-startup >
     </ servlet >
     < servlet-mapping >
         < servlet-name >springDispatcherServlet</ servlet-name >
         < url-pattern >*.action</ url-pattern >
     </ servlet-mapping >
</ web-app >

至此完工了,终于!i_f30.gifi_f28.gif


4.其他

下面简单说下项目中的xml文件哦

XML文件

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1.Spring基本的ApplicationContext.xml 本例中用的是 beans_wolf.xml(名字一定要注意,尽量用前面的)
    配置了:
     <!-- 1. 数据源 : DriverManagerDataSource -->
     <!-- 2. mybatis的SqlSession的工厂: SqlSessionFactoryBean 
         dataSource / typeAliasesPackage -->
     <!-- 3. mybatis自动扫描加载Sql映射文件 : MapperScannerConfigurer 
         sqlSessionFactory / basePackage  /configLocation-->
     <!-- 4. 事务管理 : DataSourceTransactionManager -->
     <!-- 5. 使用声明式事务 -->
   其中配置了数据库的具体信息,所以不在另外用属性文件了!
   
   2.Spring MVC 的applicationContext-mvc.xml
     配置了:自动扫描包,注解驱动,视图解析器
   
   3.mybatis-config.xml 这个具体配置根据你的实际来弄!
   
   4.web.xml
     配置了:
     <!-- needed for ContextLoaderListener -->
     < context-param >
     < param-name >contextConfigLocation</ param-name >
     < param-value >classpath:beans_wolf.xml</ param-value >
     </ context-param >
     <!-- Bootstraps the root web application context before servlet initialization -->
     < listener >
     < listener-class >
         org.springframework.web.context.ContextLoaderListener
     </ listener-class >
     </ listener >
 
    <!-- DispatcherServlet-->
     < servlet >
         < servlet-name >springDispatcherServlet</ servlet-name >
         < servlet-class >
             org.springframework.web.servlet.DispatcherServlet
         </ servlet-class >
         < init-param >
             <!-- 配置 SpringMVC 配置文件的位置 -->
             < param-name >contextConfigLocation</ param-name >
             < param-value >classpath:applicationContext-mvc.xml</ param-value >
         </ init-param >
         < load-on-startup >1</ load-on-startup >
     </ servlet >
 
   < servlet-mapping >
     < servlet-name >springDispatcherServlet</ servlet-name >
     <!-- 配置什么样的请求交由 SpringMVC 处理 -->
     < url-pattern >*.action</ url-pattern >
</ servlet-mapping >

遇到的一个很不咋地的问题

HTTP Status 500 - Request processing failed; nested exception is java.lang.IllegalArgumentException: 

Mapped Statements collection does not contain value for com.springmvc_mybatis.mapper.UserMapper.login

 

!!!少了这个<property name="configLocation" value="classpath:mybatis-config.xml" />

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< bean  id = "sqlSessionFactory"  class = "org.mybatis.spring.SqlSessionFactoryBean" >
< property  name = "dataSource"  ref = "datasource" />
< property  name = "typeAliasesPackage"  value = "com.springmvc_mybatis.bean" />
< property  name = "configLocation"  value = "classpath:mybatis-config.xml"  />
</ bean >

网友的一些问题及解决方法。。。

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Mapped Statements collection does not contain value for后面是什么类什么方法之类的: 
错误原因有几种: 
1、mapper.xml中没有加入namespace !!!!
2、mapper.xml中的方法和接口mapper的方法不对应 !!!
3、mapper.xml没有加入到mybatis-config.xml中(即总的配置文件),例外:配置了mapper文件的包路径的除外 !!!
4、mapper.xml文件名和所写的mapper名称不相同。 !!
5.java文件和xml文件的名称不一致 !
6.可能是你的controller 或者说是handler 有问题!!

另外:jsp 文件的位置要特别注意! index,一般在WebContent下!!!

那个xml文件出现问题一般是你的dtd约束,taglib等没弄好,自己细细品味下嘛,不知道度娘娘,实在不行在一起讨论哦!


5.完整Demo项目下载地址

 

w_dian.gifDemo_SpringMVC_MyBatis 完整登录及list查询,无错误,几经验证!共同学习!

   SpringMVC MyBatis 相关jar包下载

如果无法下载,请留言索取,因为上传可能出现问题!

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转载自educast.iteye.com/blog/2183743