spring mvc 组合mybatis框架实例详解

说明

本项目采用 maven 结构，主要演示了 spring mvc + mybatis,controller 获取数据后以json 格式返回数据。

项目结构

包依赖与说明

pom文件：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.hbb0b0.maven01</groupId>
<artifactId>maven01</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>maven01 Maven Webapp</name>
<url>http://maven.apache.org</url>
<properties>
<!-- mybatis版本号 -->
<mybatis.version>3.2.6</mybatis.version>
<!-- log4j日志文件管理包版本 -->
<slf4j.version>1.7.7</slf4j.version>
<log4j.version>1.2.17</log4j.version>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>4.1.2.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.codehaus.jackson/jackson-mapper-asl -->
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.2</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.codehaus.jackson/jackson-core-asl -->
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-core-asl</artifactId>
<version>1.9.13</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.3</version>
</dependency>
<!-- mybatis/spring包 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.3.0</version>
</dependency>
<!-- 导入Mysql数据库链接jar包 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.30</version>
</dependency>
<!-- mybatis ORM框架 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.1</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>4.1.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.1.2.RELEASE</version>
</dependency>
</dependencies>
<build>
<finalName>maven01</finalName>
</build>
</project>

配置说明

web.xml

<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems,Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
<display-name>Archetype Created Web Application</display-name>
<!--configure the setting of springmvcDispatcherServlet and configure the mapping-->
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/springmvc-servlet.xml</param-value>
</init-param>
<!-- <load-on-startup>1</load-on-startup> -->
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>

springmvc-servlet.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"
xsi:schemaLocation="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-4.1.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd">
<!-- scan the package and the sub package -->
<context:component-scan base-package="com.maven01.*" />
<!-- don't handle the static resource -->
<mvc:default-servlet-handler />
<!-- if you use annotation you must configure following setting -->
<mvc:annotation-driven />
<!-- 对静态资源的处理 ，不需要dispatcher servelet -->
<mvc:resources mapping="/static/**" location="/static/" />
<!-- configure the InternalResourceViewResolver -->
<!-- if you use annotation you must configure following setting -->
<bean id="mappingJacksonHttpMessageConverter"
class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<value>application/json;charset=UTF-8</value>
</list>
</property>
</bean>
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver"
id="internalResourceViewResolver">
<!-- 前缀 -->
<property name="prefix" value="/WEB-INF/view/" />
<!-- 后缀 -->
<property name="suffix" value=".jsp" />
</bean>
<!-- mysql -->
<!-- 引入外部数据源配置信息 -->
<bean
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<value>classpath:jdbc.properties</value>
</property>
</bean>
<!-- 配置数据源 -->
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="${jdbc.driver}"></property>
<property name="url" value="${jdbc.url}"></property>
<property name="username" value="${jdbc.username}"></property>
<property name="password" value="${jdbc.password}"></property>
</bean>
<!-- spring和MyBatis完美整合，不需要mybatis的配置映射文件 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<!-- 自动扫描mapping.xml文件 -->
<property name="mapperLocations" value="classpath:com/maven01/mapper/*.xml"></property>
</bean>
<!-- DAO接口所在包名，Spring会自动查找其下的类 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.maven01.dao" />
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
</bean>
<!-- 配置事务管理器 -->
<bean id="txManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
</beans>

jdbc.properties
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/employees?useUnicode=true&characterEncoding=UTF-8
jdbc.username=root
jdbc.password=sqlsa

mybatis mapper 文件的配置

<?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.maven01.dao.IEmployeeDao">
<select id="getAll" resultType="com.maven01.pojo.Employee">
select
*
from
employees
limit 1,10
</select>
</mapper>

db结构

本项目采用了 mysql 的示例 employees 数据库,需要的朋友可以自行下载。

http://www3.ntu.edu.sg/home/ehchua/programming/sql/SampleDatabases.html

代码说明

model

package com.maven01.pojo;
public class Employee {
public int emp_no;
public String first_name;
public int getEmp_no() {
return emp_no;
}
public void setEmp_no(int emp_no) {
this.emp_no = emp_no;
}
public String getFirst_name() {
return first_name;
}
public void setFirst_name(String first_name) {
this.first_name = first_name;
}
}

dao

package com.maven01.dao;
import java.util.List;
import org.springframework.stereotype.Repository;
import com.maven01.pojo.Employee;
public interface IEmployeeDao {
public List<Employee> getAll();
}

service

package com.maven01.service;
import java.util.List;
import com.maven01.pojo.Employee;
public interface IEmployeeService {
public List<Employee> getAll();
}

serviceImpl

package com.maven01.service.impl;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.maven01.dao.IEmployeeDao;
import com.maven01.pojo.Employee;
import com.maven01.service.*;
import javax.annotation.Resource;
@Service
public class EmployeeServiceImpl implements IEmployeeService
{
@Autowired
private IEmployeeDao dao ;
public EmployeeServiceImpl()
{
}
public List<Employee> getAll() {
return dao.getAll();
}
}

controller

package com.maven01.controller;
import java.util.ArrayList;
import java.util.List;
import javax.annotation.Resource;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import com.maven01.dto.*;
import com.maven01.pojo.Employee;
import com.maven01.service.IEmployeeService;
@Controller
@RequestMapping("/mvc")
public class DemoController {
@Resource
private IEmployeeService employeeService;
@RequestMapping(method = RequestMethod.GET,value = "/getEmployeeList",produces = "application/json")
public @ResponseBody List<Employee> getEmployeeList() {
return employeeService.getAll();
}
}

运行结果

本项目代码已提交 git,下载地址 https://github.com/hbb0b0/springMyBatis.git

遇到的坑：

MapperScannerConfigurer 配置为仅仅包含dao层就可以了，千万不要配置问整个包扫描，不然会出现错误：No qualifying bean of type [com.maven01.service.IEmployeeService] is defined: expected single matching bean but found 2: employeeServiceImpl,IEmployeeService

<!-- DAO接口所在包名，Spring会自动查找其下的类 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.maven01.*" />
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
</bean>
org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [com.maven01.service.IEmployeeService] is defined: expected single matching bean but found 2: employeeServiceImpl,IEmployeeService
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1061)
<!-- DAO接口所在包名，Spring会自动查找其下的类 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.maven01.dao" />
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
</bean>

注意mybatis 包的匹配较低版本 mybatis-spring 与 mybatis 与 spring 结合会出现
java.lang.AbstractMethodError: org.mybatis.spring.transaction.SpringManagedTransaction.getTimeout()L

总结

以上所述是小编给大家介绍的spring mvc 组合mybatis框架实例详解，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对编程小技巧网站的支持！

spring mvc 组合mybatis框架实例详解

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