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