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.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsdhttp://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><beanclass="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 --><beanclass="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"><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><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.propertiesjdbc.driver=com.mysql.jdbc.Driverjdbc.url=jdbc:mysql://localhost:3306/employees?useUnicode=true&characterEncoding=UTF-8jdbc.username=rootjdbc.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*fromemployeeslimit 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;@Servicepublic class EmployeeServiceImpl implements IEmployeeService{@Autowiredprivate 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 {@Resourceprivate 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><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,IEmployeeServiceat 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><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武林网网站的支持！