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  • Spring+Spring MVC+MyBatis整合

    一、准备工作

        1.1导入所需jar包                                                    

        

      

      1.2数据库

      

      

    CREATE TABLE `t_customer` (
      `id` int(32) NOT NULL AUTO_INCREMENT,
      `username` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
      `jobs` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
      `phone` varchar(16) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
      PRIMARY KEY (`id`) USING BTREE
    ) ENGINE=InnoDB AUTO_INCREMENT=19 DEFAULT CHARSET=utf8;

     二、编写配置文件

      2.1编写db.propertise文件 

    #dataSource
    #Thu Mar 07 16:27:40 CST 2019
    jdbc.driver=com.mysql.jdbc.Driver
    jdbc.url=jdbc:mysql://localhost:3306/sm
    jdbc.username=root
    jdbc.password=123456
    jdbc.maxTotal=30
    jdbc.maxIdle=10
    jdbc.initialSize=5

      2.2在src目录下创建beans.xml(applicationContext.xml) 

    <?xml  version="1.0"  encoding="UTF-8"?> 
    <beans  xmlns="http://www.springframework.org/schema/beans" 
            xmlns:aop="http://www.springframework.org/schema/aop"
            xmlns:tx="http://www.springframework.org/schema/tx"
            xmlns:context="http://www.springframework.org/schema/context"         
            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-4.3.xsd
                http://www.springframework.org/schema/context 
                 http://www.springframework.org/schema/context/spring-context-4.3.xsd
                 http://www.springframework.org/schema/tx
                 http://www.springframework.org/schema/tx/spring-tx-4.3.xsd
                 http://www.springframework.org/schema/aop
                 http://www.springframework.org/schema/aop/spring-aop-4.3.xsd" > 
        <!-- 读取 db.properties-->
        <context:property-placeholder location = "classpath:db.properties"/>
        <!-- 配置数据源 -->
        <bean id = "dataSource" class = "org.apache.commons.dbcp2.BasicDataSource">
            <!-- 数据库驱动 -->
            <property name = "driverClassName" value = "${jdbc.driver}" />
            <!-- 数据库url -->
            <property name = "url" value = "${jdbc.url}" />
            <!-- 数据库用户名 -->
            <property name = "username" value = "${jdbc.username}" />
            <!-- 数据库密码 -->
            <property name = "password" value = "${jdbc.password}" />
            <!-- 数据库最大连接数 -->
            <property name="maxTotal" value = "${jdbc.maxTotal}"/>
            <!-- 数据库最大空闲数 -->
            <property name="maxIdle" value = "${jdbc.maxIdle}"/>
            <!-- 初始化连接数 -->
            <property name="initialSize" value = "${jdbc.initialSize}"/>
        </bean>    
        <!-- 配置事务管理,并指定数据源 -->
        <bean id = "transactionManager" 
                class = "org.springframework.jdbc.datasource.DataSourceTransactionManager">
            <property name = "dataSource" ref = "dataSource" />
        </bean>
        <!-- 开启事务注解 -->
        <tx:annotation-driven transaction-manager = "transactionManager" />
        <!-- 扫描 此处会扫描com.ssm.service及com.ssm.service.Impl-->
        <context:component-scan base-package="com.ssm.service"/>
        <!-- 配置MyBatis工厂 -->
        <bean id = "sqlSessionFactory" class = "org.mybatis.spring.SqlSessionFactoryBean">
            <!-- 注入数据源 -->
            <property name="dataSource" ref = "dataSource"/>
            <!-- 指定核心配置文件 -->
            <property name="configLocation" value = "classpath:mybatis-config.xml"/>
        </bean>
        <!-- 基于MapperScannerConfigurer,会自动扫描指定包下的接口文件和映射文件 -->
        <bean class = "org.mybatis.spring.mapper.MapperScannerConfigurer">
            <property name = "basePackage" value = "com.ssm.dao"/>
        </bean>
    </beans>

        2.3在src目录下创建mybatis-congfig.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>
        <!-- 采用扫描包定义别名 -->
        <typeAliases>
            <package name="com.ssm.po"/>
        </typeAliases>
        
        <!-- 配置映射文件 -->
        <mappers>
            
        </mappers>
    </configuration>

        2.4在src目录下创建springmvc-config.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:mvc="http://www.springframework.org/schema/mvc"
            xmlns:tx="http://www.springframework.org/schema/tx"
             xsi:schemaLocation="  
                http://www.springframework.org/schema/beans 
                http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
                http://www.springframework.org/schema/mvc 
                http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd  
                http://www.springframework.org/schema/context 
                http://www.springframework.org/schema/context/spring-context-4.3.xsd"> 
           <!-- 开启扫描 -->
           <context:component-scan base-package = "com.ssm.controller"/>
        <!--加载注解驱动--> <mvc:annotation-driven/>    <!--配置视图解析器 设置前缀后缀--> <bean id = "viewResolver" class = "org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value = "/WEB-INF/jsp/"></property> <property name="suffix" value = ".jsp"></property> </bean> </beans>

        

      2.5web.xml

    <?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns="http://xmlns.jcp.org/xml/ns/javaee" 
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" 
    id="WebApp_ID" version="3.1">
      <display-name>SSM</display-name>
      <welcome-file-list>
        <welcome-file>index.html</welcome-file>
        <welcome-file>index.htm</welcome-file>
        <welcome-file>index.jsp</welcome-file>
        <welcome-file>default.html</welcome-file>
        <welcome-file>default.htm</welcome-file>
        <welcome-file>default.jsp</welcome-file>
      </welcome-file-list>
      <!-- 配置Spring文件的监听器 -->
      <context-param>
          <param-name>contextConfigLocation</param-name>
          <param-value>classpath:beans.xml</param-value>
      </context-param>
      <listener>
          <listener-class>
              org.springframework.web.context.ContextLoaderListener
          </listener-class>
      </listener>
      <!-- 配置编码过滤器 -->
      <filter>
          <filter-name>encoding</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>
      </filter>
      <filter-mapping>
          <filter-name>encoding</filter-name>
          <url-pattern>*.action</url-pattern>
      </filter-mapping>
      <!-- 配置Spring MVC前端控制器 -->
      <servlet>
          <servlet-name>springmvc</servlet-name>
          <servlet-class>
              org.springframework.web.servlet.DispatcherServlet
          </servlet-class>
          <init-param>
              <param-name>contextConfigLocation</param-name>
              <param-value>classpath:springmvc-config.xml</param-value>
          </init-param>
          <!-- 服务器启动立即加载SpringMVC配置文件 -->
          <load-on-startup>1</load-on-startup>
      </servlet>
      <servlet-mapping>
          <servlet-name>springmvc</servlet-name>
          <!-- 拦截所有请求 -->
          <url-pattern>/</url-pattern>
      </servlet-mapping>
       
    </web-app>

    三、测试整合

      3.1在src目录下创建com.ssm.po包,并创建Customer类

    Customer.java

    package com.ssm.po;
    
    public class Customer {
        private Integer id;
        private String username;
        private String jobs;
        private String phone;
        public Integer getId() {
            return id;
        }
        public void setId(Integer id) {
            this.id = id;
        }
        public String getUsername() {
            return username;
        }
        public void setUsername(String username) {
            this.username = username;
        }
        public String getJobs() {
            return jobs;
        }
        public void setJobs(String jobs) {
            this.jobs = jobs;
        }
        public String getPhone() {
            return phone;
        }
        public void setPhone(String phone) {
            this.phone = phone;
        }
        @Override
        public String toString() {
            return "Customer [id=" + id + ", username=" + username + ", jobs=" + jobs + ", phone=" + phone + "]";
        }
    }

      3.2在src目录下创建com.ssm.dao包,并创建接口文件CustomerDao.java和映射文件CustomerDao.xml

      CustomerDao.java

    package com.ssm.dao;
    
    import com.ssm.po.Customer;
    
    public interface CustomerDao {
        public Customer findCustomerById(Integer id);
    }

      CustomerDao.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.ssm.dao.CustomerDao" >
        <!-- 根据ID查询客户信息 -->
        <select id = "findCustomerById" parameterType = "Integer" resultType = "com.ssm.po.Customer">
            select * from t_customer where id = #{id}
        </select>
        
    </mapper>

      注:接口文件和映射文件的名称要保持一致,映射文件namespace名称要符合规范。

        接口方法名和映射文件语句id,返回值类型、参数类型要保持一致。

        两个文件要在同一包中。

     

      3.3在src目录下创建com.ssm.service包,并创建接口文件CustomerService.java 

    package com.ssm.service;
    
    import org.springframework.stereotype.Service;
    
    import com.ssm.po.Customer;
    @Service
    public interface CustomerService {
        public Customer findCustomerById(Integer id);
    }

      3.4在src目录下创建com.ssm.service.Impl包,并在其中创建CustoemrService接口的实现类CustomerServiceImpl.java

      CustomerService.java

    package com.ssm.service.Impl;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    import org.springframework.transaction.annotation.Transactional;
    
    import com.ssm.dao.CustomerDao;
    import com.ssm.po.Customer;
    import com.ssm.service.CustomerService;
    
    @Service   //标记当前类,通过扫描注册
    @Transactional
    public class CustomerServiceImpl implements CustomerService{
        @Autowired //按类型自动装配
        private CustomerDao customerDao;
        
        @Override
        public Customer findCustomerById(Integer id) {
            return this.customerDao.findCustomerById(id);
        }
    
    }

        3.5在src目录下创建com.ssm.controller包,并创建CustomerController类

      CustomerController.java

    package com.ssm.controller;
    
    
    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.ssm.po.Customer;
    import com.ssm.service.CustomerService;
    
    @Controller //标注为控制类,自动扫描
    public class CustomerController {
        @Autowired //按类型自动装配
        private CustomerService customerService;
        
        @RequestMapping("/findCustomerById")
        public String findCustomerById(Integer id, Model model) {
            Customer customer = customerService.findCustomerById(id);
            model.addAttribute("customer", customer);
            return "customer";//返回WEB-INF/jsp/customer.jsp
        }
    }

       3.6在WEB-INF目录下创建文件夹jsp,并在其中创建customer.jsp

    <%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!DOCTYPE html>
    <html>
    <head>
    <meta charset="UTF-8">
    <title>Insert title here</title>
    </head>
    <body>
        <table border="1">
            <tr>
                <td>id</td>
                <td>姓名</td>
                <td>职业</td>
                <td>电话</td>
            </tr>
            <tr>
                <td>${customer.id}</td>
                <td>${customer.username}</td>
                <td>${customer.jobs}</td>
                <td>${customer.phone}</td>
            </tr>
        </table>
    </body>
    </html>

    启动服务器,添加项目。

    地址栏输入:http://localhost:8080/SSM/findCustomerById?id=1

    项目结构:

    常见错误:

    1、配置文件中书写错误,例如classpath拼写错误、文件名拼写错误(beans.xml写错了benas.xml)。

    2、com.ssm.service.Impl写成了com.ssm.serviceImpl,

       在beans.xml中配置的:

        <context:component-scan base-package="com.ssm.service"/>(会扫描com.ssm.service及com.ssm.service.*)

     不会扫描com.ssm.serviceImpl.

    3、com.ssm.dao中映射文件和接口文件不匹配。

    4、注解导入错误:注意导入的注解多是org.springframework中的注解。

    5、视图解析器前后缀配置错误,找不到路径。

    7、RequestMapping("xxx")中设置路径与地址栏输入路径不一致。

    8. 文件中未设置自动扫描,找不到指定类。

       

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  • 原文地址:https://www.cnblogs.com/huang-changfan/p/10497589.html
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