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亿速云网站的支持！
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