标签：new catch web.xml pac ini location doc 数据库 frame
spring+SpringMVC+MyBatis框架（SSM）是比较热门的中小型企业级项目开发的框架，对于新手来说也是比较容易学习入门的。虽说容易，但在框架搭建过程中仍然遇到了许多问题，因此用实例记录下来吧。
Spring框架包及其依赖包
MyBatis框架包及其依赖包
MyBatis-EhCache架包
C3P0架包
MySQL数据库驱动包
项目架包如下：
项目结构如下：
<?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> <setting name="cacheEnabled" value="true"/> </settings> </configuration>
因为MyBatis交给Spring管理，因此Mapper在Spring中配置，这里的配置只打开二级缓存
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="driverClass" value="com.mysql.jdbc.Driver" /> <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/db_pwc" /> <property name="user" value="pwc" /> <property name="password" value="123456" /> <property name="maxPoolSize" value="20" /> <property name="minPoolSize" value="1" /> <property name="initialPoolSize" value="3" /> <property name="maxIdleTime" value="15" /> </bean> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="configLocation" value="classpath:sqlMapConfig.xml" /> <property name="dataSource" ref="dataSource" /> </bean> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="cn.pwc.dao.mapper" /> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" /> </bean> </beans>
1.该配置自动扫描单例化采用代理方式的Mapper，单例化的Mapper的bean名为Mapper接口第一个字母为小写的名。
2.千万要注意sqlSessionFactory的bean中的configLocation属性，其value值务必记得加上classpath:前缀，不然无法加载MyBatis配置文件
UserService.Java
package cn.pwc.service; import java.util.List; import cn.pwc.pojo.User; public interface UserService { public void add(User user) throws Exception; public void delete(User user) throws Exception; public User getUserById(int id) throws Exception; public List<User> listUserByAge(int age) throws Exception; }
UserServiceBean.java
package cn.pwc.service.impl; import java.util.List; import javax.annotation.Resource; import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Transactional; import cn.pwc.dao.mapper.UserMapper; import cn.pwc.pojo.User; import cn.pwc.service.UserService; @Service @Transactional public class UserServiceBean implements UserService{ @Resource(name="userMapper") private UserMapper mapper; @Override public void add(User user) throws Exception { mapper.insert(user); } @Override public void delete(User user) throws Exception { mapper.deleteById(user.getId()); } @Override public User getUserById(int id) throws Exception { User user=null; user=mapper.findById(id); if(user==null){ throw new Exception("User is not existed!"); } return user; } @Override public List<User> listUserByAge(int age) throws Exception { List<User> list=null; list=mapper.findByAge(age); if(list==null){ throw new Exception("List is empty!"); } return list; } }
本实例采用自动扫描加载的方式，因此该业务bean需注解@Service
本实例交由Spring管理事务，因此该业务bean需注解@Transactional
<context:component-scan base-package="cn.pwc.service" />
<bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource" /> </bean> <tx:annotation-driven transaction-manager="txManager" />
采用mvc:annotation-driven标签自动装载视图控制器处理器解析器等
<context:component-scan base-package="cn.pwc.controller"/> <mvc:annotation-driven /> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/" /> <property name="suffix" value=".jsp" /> </bean>
采用mvc:annotation-driven标签自动装载视图控制器处理器解析器等
package cn.pwc.controller; import javax.annotation.Resource; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.servlet.ModelAndView; import cn.pwc.pojo.User; import cn.pwc.service.UserService; @Controller public class HelloController { @Resource(name="userServiceBean") private UserService service; @RequestMapping("/hello") public ModelAndView sayHello(){ User user=null; User user2=null; User user3=null; try { user = service.getUserById(1); user2=service.getUserById(1); user3=service.getUserById(1); System.out.println("OK!"); } catch (Exception e) { e.printStackTrace(); } ModelAndView view=new ModelAndView("hello"); view.addObject("user", user); return view; } }
该Controller类需注解@Controller
视图控制方法需注解@RequestMapping，作为url请求处理方法
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:applicationContext-*.xml</param-value> </context-param> <servlet> <servlet-name>springMVC</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> </servlet> <servlet-mapping> <servlet-name>springMVC</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
务必注意servlet-mapping中url-pattern属性值不能为/*
加载的配置文件路径必须有classpath:前缀
标签：new catch web.xml pac ini location doc 数据库 frame
原文地址：http://www.cnblogs.com/PMlog/p/6577197.html
