前面我们用maven 搭建 springmvc+spring,今天我们再来添加一个持久化框架mybatis(前面也建过mybatis的helloworld),做一个查user信息的小项目
一 用maven来构建
1 构建方法参考 (换上项目对象模型配置文件就可以了pom.xml)
http://blog.youkuaiyun.com/onewby/article/details/78582477
2 p上项目架构,构建后补补一下包
3 数据库部分
//建数据库
create database springmvc;
//建表
CREATE TABLE `user` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`username` varchar(10) DEFAULT NULL,
`password` varchar(10) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;
//插入数据
INSERT INTO `springmvc`.`user`
(`id`,
`username`,
`password`)
VALUES
(1,'wby','123456')
4 web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<!--spring ioc 容器随web一起启动-->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>
<listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>
<!--
springmvc的默认配置文件是放在WEB-INF下的,叫action-servlet.xml
想改在resources下,那么就得修改web.xml下的分发器的servlet,具体如下:
-->
<servlet>
<servlet-name>action</servlet-name>
<servlet-class>
org.springframework.web.servlet.DispatcherServlet
</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>action</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
5 applicationContext.xml配置文件
<?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:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
<!--spring 管理业务逻辑组件-->
<context:component-scan base-package="com.wby">
<!--除去控制器,交由Springmvc配置文件-->
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller" />
</context:component-scan>
<!--数据源 采用c3p0-->
<context:property-placeholder location="classpath:dbconfig.properties" />
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>
<property name="driverClass" value="${jdbc.driverClass}"></property>
<property name="user" value="${jdbc.user}"></property>
<property name="password" value="${jdbc.password}"></property>
</bean>
<!--事物管理-->
<bean id="dataSourceTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!-- 开启基于注解的事务 -->
<tx:annotation-driven transaction-manager="dataSourceTransactionManager"/>
<!--整合mybatis-->
<!--为了service 层能够调用 dao层下接口,现有如下配置-->
<!--@Autowired-->
<!--private UserMapper userMapper;-->
<!--public List<User> getUser(){-->
<!--return userMapper.getUser();-->
<!--}-->
<!---->
<!--创建sqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"></property>
<!-- 指定mybatis-config.xml全局配置文件的位置 -->
<property name="configLocation" value="classpath:mybatis-config.xml"></property>
<!-- 指定mapper文件的位置-->
<property name="mapperLocations" value="classpath:mapper/*.xml"></property>
</bean>
<!--扫描所有的mapper,让他们可以注入进来-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.wby.dao" />
</bean>
</beans>
6 springmvc.xml配置文件
<?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-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!--控制网站跳转逻辑-->
<!--只扫描控制器-->
<context:component-scan base-package="com.wby" use-default-filters="false">
<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller" />
</context:component-scan>
<!--处理动态资源等-->
<mvc:annotation-driven/>
<!--处理静态资源-->
<mvc:default-servlet-handler/>
<!--视图解析器-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
<property name="prefix" value="/WEB-INF/pages/"/>
<property name="suffix" value=".jsp"/>
</bean>
</beans>
7 mybatis-config.xml 配置文件
<?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>
<settings>
<!--开启驼峰命名-->
<setting name="mapUnderscoreToCamelCase" value="true"/>
<setting name="jdbcTypeForNull" value="NULL"/>
<setting name="lazyLoadingEnabled" value="true"/>
</settings>
<!--<databaseIdProvider type="DB_VENDOR">-->
<!--<property name="MySQL" value="mysql"/>-->
<!--<property name="Oracle" value="oracle"/>-->
<!--<property name="SQL Server" value="sqlserver"/>-->
<!--</databaseIdProvider>-->
</configuration>
8 entity(domain,ben)层 先建一user.java实体
package com.wby.entity;
/**
* Created by Administrator on 2017/11/25.
*/
public class User {
private int id;
private String username;
private String password;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
9 dao层
package com.wby.dao;
import java.util.List;
import com.wby.entity.User;
/**
* Created by Administrator on 2017/11/25.
*/
public interface UserMapper {
public List<User> getUser();
}
10 **dao层下接口的映射文件 ***mapper.xml(相当于daoimpl) UserMapper.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.wby.dao.UserMapper">
<!--public List<User> getUser();-->
<select id="getUser" resultType="com.wby.entity.User">
select * from user
</select>
</mapper>
11 service 层
package com.wby.service;
import com.wby.dao.UserMapper;
import com.wby.entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
/**
* Created by Administrator on 2017/11/25.
*/
@Service
public class UserService {
@Autowired
private UserMapper userMapper;
public List<User> getUser(){
return userMapper.getUser();
}
}
12 controller层
package com.wby.controller;
import com.wby.entity.User;
import com.wby.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import java.util.List;
import java.util.Map;
/**
* Created by Administrator on 2017/11/25.
*/
@Controller
public class UserController {
@Autowired
UserService userService;
@RequestMapping("/index.html")
public String emps( Map<String,Object> map){
List<User> users = userService.getUser();
map.put("users", users);
return "main";
}
}
dbconfig.properties
jdbc.jdbcUrl=jdbc:mysql://localhost:3306/springmvc
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.user=root
jdbc.password=root
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.wby</groupId>
<artifactId>ssm</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.3.12.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>4.3.12.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-aspects -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>4.3.12.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.3.12.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>4.3.12.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>4.3.12.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/jstl/jstl -->
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.2</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.3.1</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.41</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.mchange/c3p0 -->
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5.2</version>
</dependency>
<!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.0</version>
<scope>provided</scope>
</dependency>
</dependencies>
</project>
二 建议
2.1.0采用tomcat 9.0莫名的问题,换为tomcat8.0莫名地解决
2.1.1百度了一下 maven ssm 404 ,查到说路径问题,前前后后看了百余变发现路径没问题啊
2.1.2WEB-INF 里面的.jsp不能直接访问,只能通过controller来控制访问,我认了,可我有一个index.jsp 就在webapp下也不给我访问…连localhost:8080也不给
emmm…如果出现此类问题先检查是否出现2.1.1,2.1.2,这样类似的情况么。。。若实在没有就换tomcat8 试试。
三 运行结果