添加完依赖后需要更新一下项目

打上下图所标记的√

错误就解除了

添加Spring，SpringMVC，MyBatis的配置文件

applicationContext-mvc.xml

<?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:tx="http://www.springframework.org/schema/tx"
  xmlns:aop="http://www.springframework.org/schema/aop"
  xmlns:mvc="http://www.springframework.org/schema/mvc"
  xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
    http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
    http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">
<!-- 配置自动扫描的包，自动加入WebIoc容器中 -->
<context:component-scan base-package="com.imooc.handler"></context:component-scan>
<!-- 配置视图解析器，   -->
<bean  class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix"  value="/WEB-INF/jsp/"></property>
    <property name="suffix"  value=".jsp"></property>
</bean>
<!-- 处理静态资源文件，303校验等等（标配，必须写） -->
<mvc:default-servlet-handler/>
<mvc:annotation-driven></mvc:annotation-driven>
</beans>

applicationContext.xml

<?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:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop"
  xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
    http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
  <!-- 配置自动扫描的包，使其自动注入到IOC容器 -->
  <context:component-scan base-package="com.imooc.service"></context:component-scan>
  <!-- 导入资源文件 -->
  <context:property-placeholder location="classpath:db.properties" />
  <!-- 配置数据源 -->
  <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    <property name="user" value="${jdbc.user}"></property>
    <property name="password" value="${jdbc.password}"></property>
    <property name="driverClass" value="${jdbc.driverClass}"></property>
    <property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>
    <property name="initialPoolSize" value="${jdbc.initPoolSize}"></property>
    <property name="maxPoolSize" value="${jdbc.maxPoolSize}"></property>
  </bean>
  <!-- 配置MyBatis的SqlSession -->
  <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <!-- 配置MyBatis的配置的文件 -->
    <property name="configLocation" value="classpath:mybatis.xml"></property>
  </bean>
  <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
      <!-- 自动扫描 com.imooc.dao下的interface,并加入IOC容器-->
    <property name="basePackage" value="com.imooc.dao" />
    <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
  </bean>
  <!-- 开启事务 -->
  <bean id="transactionManager"
    class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="dataSource" />
  </bean>
  <!-- 可通过注解控制事务 -->
  <tx:annotation-driven transaction-manager="transactionManager" />
</beans>

db.properties

jdbc.user=root
jdbc.password=root
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.jdbcUrl=jdbc:mysql://localhost:3306/text
jdbc.initPoolSize=5
jdbc.maxPoolSize=10
#...

mybatis.xml

<?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>
  <!-- 
  =====>设置别名: 将com.imooc.entity.User设置为User 
  如果不设置别名<select id="selectDemo" resultType="com.imooc.entity.User"> ***</select>
  设置别名            <select id="selectDemo" resultType="User">***</select>
   -->
  <typeAliases>
    <package name="com.imooc.entity"></package>
  </typeAliases>
  <mappers>
    <mapper resource="com/imooc/mapper/UserMapper.xml" />
  </mappers>
</configuration>

修改web.xml文件（就是加一个字符过滤器，SpringMVC的servlet,Spring的Listener）

<?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>SSMMaven</display-name>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  <!-- 设置字符过滤器，防止乱码 -->
  <filter>
    <filter-name>characterEncodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
    <init-param>
      <param-name>forceEncoding</param-name>
      <param-value>true</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>characterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  <!-- SpringMVC -->
  <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>/</url-pattern>
  </servlet-mapping>
  <!-- Spring -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
  </context-param>
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
</web-app>

创建包和类

dao层

package com.imooc.dao;
public interface UserMapper {
  //根据username查询password
  String selectPassword(String username);
}

实体类

package com.imooc.entity;
public class User {
  private Integer id;
  private String username;
  private String password;
  public User() {
    super();
  }
  public User(String username, String password) {
    super();
    this.username = username;
    this.password = password;
  }
  /*
   * (non-Javadoc)
   * 
   * @see java.lang.Object#toString()
   */
  @Override
  public String toString() {
    return "User [id=" + id + ", username=" + username + ", password=" + password + "]";
  }
  /**
   * @return the id
   */
  public Integer getId() {
    return id;
  }
  /**
   * @param id
   *            the id to set
   */
  public void setId(Integer id) {
    this.id = id;
  }
  /**
   * @return the username
   */
  public String getUsername() {
    return username;
  }
  /**
   * @param username
   *            the username to set
   */
  public void setUsername(String username) {
    this.username = username;
  }
  /**
   * @return the password
   */
  public String getPassword() {
    return password;
  }
  /**
   * @param password
   *            the password to set
   */
  public void setPassword(String password) {
    this.password = password;
  }
}

控制层Controller

package com.imooc.handler;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import com.imooc.entity.User;
import com.imooc.service.UserService;
@Controller
public class LoginHandler {
  @Autowired
  private UserService userService;
  @RequestMapping("/login.action")
  public String login(User user){
    String password=userService.login(user.getUsername());
    if(!user.getPassword().equals(password)){
      return "error";
    }else{
      return "success";
    }
  }
  /**
   * @return the userService
   */
  public UserService getUserService() {
    return userService;
  }
  /**
   * @param userService the userService to set
   */
  public void setUserService(UserService userService) {
    this.userService = userService;
  }
}

dao层的XML

<?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.imooc.dao.UserMapper">
  <select id="selectPassword"  resultType="String">
    select password from user where username = #{username}
  </select>
</mapper>

service层

package com.imooc.service;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.imooc.dao.UserMapper;
@Service
public class UserService {
  @Autowired
  private UserMapper userDao;
  public String login(String username){
    return userDao.selectPassword(username);
  }
  public UserService() {
    super();
  }
  /**
   * @return the userDao
   */
  public UserMapper getUserDao() {
    return userDao;
  }
  /**
   * @param userDao the userDao to set
   */
  public void setUserDao(UserMapper userDao) {
    this.userDao = userDao;
  }
}

添加JSP页面

index.jsp

<%@ 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>
<form action="login.action" method="post">
username<input type="text"  name="username"><br/>
password<input type="password"  name="password"><br/>
<input type="submit" value="Submit">
</form>
</body>
</html>

success.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
success.jsp
</body>
</html>

error.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
error.jsp
</body>
</html>

SSM框架整合：SpringMVC + Spring + MyBatis+Maven(二)

添加完依赖后需要更新一下项目

添加Spring，SpringMVC，MyBatis的配置文件

修改web.xml文件（就是加一个字符过滤器，SpringMVC的servlet,Spring的Listener）

创建包和类

添加JSP页面

大功告成

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