SpringMVC +Hibernate JPA+Spring-data-jpa

╰+攻爆jí腚メ 2022-08-03 00:54 222阅读 0赞

公司用SpringMVC +Hibernate JPA+Spring-data-jpa 开发。之前没有用过Spring-data-jpa 就想简单用下。

applicationContext.xml配置如下：

<?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:jdbc="http://www.springframework.org/schema/jdbc" xmlns:jee="http://www.springframework.org/schema/jee"
    	xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jpa="http://www.springframework.org/schema/data/jpa"
    	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:util="http://www.springframework.org/schema/util"
    	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/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.0.xsd
    		http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd
    		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
    		http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
    		http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
    		http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.0.xsd"
    	default-lazy-init="true">
    
    	<description>Spring公共配置 </description>
    	
    	<aop:config proxy-target-class="true" />
    
    	
    
    	<context:component-scan base-package="com.csair">
    		<context:exclude-filter type="annotation"
    			expression="org.springframework.stereotype.Controller" />
    		<context:exclude-filter type="annotation"
    			expression="org.springframework.web.bind.annotation.ControllerAdvice" />
    	</context:component-scan>
    
    	
    	<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
    		destroy-method="close">
    		
    		<property name="driverClassName" value="${jdbc.driver}" />
    		<property name="url" value="${jdbc.url}" />
    		<property name="username" value="${jdbc.username}" />
    		<property name="password" value="${jdbc.password}" />
    
    		
    		<property name="maxActive" value="${dbcp.maxActive}" />
    		<property name="maxIdle" value="${dbcp.maxIdle}" />
    		<property name="defaultAutoCommit" value="false" />
    		
    		<property name="timeBetweenEvictionRunsMillis" value="3600000" />
    		<property name="minEvictableIdleTimeMillis" value="3600000" />
    	</bean>
    
    
    
    	
    	<bean id="entityManagerFactory"
    		class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    		<property name="dataSource" ref="dataSource" />
    		<property name="jpaVendorAdapter" ref="hibernateJpaVendorAdapter" />
    		<property name="packagesToScan" value="com.csair.entity" />
    		<property name="jpaProperties">
    			<props>
    				<prop key="hibernate.ejb.naming_strategy">org.hibernate.cfg.ImprovedNamingStrategy</prop>
    				<prop key="hibernate.show_sql">true</prop>
    				<prop key="hibernate.hbm2ddl.auto">update</prop>
    			</props>
    		</property>
    	</bean>
    
    	
    	<bean id="hibernateJpaVendorAdapter"
    		class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
    		<property name="databasePlatform" value="org.hibernate.dialect.MySQLDialect" />
    	</bean>
    
    	
    	<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
    		<property name="entityManagerFactory" ref="entityManagerFactory" />
    	</bean>
    
    	
    	
    	
    	
    	
    	<jpa:repositories base-package="com.csair.repository"
    		entity-manager-factory-ref="entityManagerFactory"
    		transaction-manager-ref="transactionManager">
    	</jpa:repositories>
    
    	
    	<tx:annotation-driven transaction-manager="transactionManager"
    		proxy-target-class="true" />
    	
    	<bean id="validator"
    		class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean" />
    
    	
    	<beans profile="production">
    		<context:property-placeholder
    			ignore-unresolvable="true" location="classpath*:/db.properties" />
    	</beans>
    	
    	<beans profile="development">
    		<context:property-placeholder
    			ignore-resource-not-found="true"
    			location="classpath*:/db.properties,
              			  classpath*:/db_dev.properties" />
    	</beans>
    	
    	<beans profile="test">
    		<context:property-placeholder
    			ignore-resource-not-found="true" location="classpath*:/db_test.properties" />
    
    	</beans>
    </beans>

spring-servlet.xml 配置如下

web.xml 如下

<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" metadata-complete="true" version="3.0">
      <display-name>Archetype Created Web Application</display-name>
      <context-param>
        <param-name>log4jConfigLocation</param-name>
        <param-value>classpath*:/log4j.xml</param-value>
      </context-param>
      <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath*:/applicationContext*.xml</param-value>
      </context-param>
      
      
      <context-param>
    	<param-name>spring.profiles.default</param-name>
    	<param-value>development</param-value>
      </context-param>
      
      <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
      </listener>
      
      
    	<filter>
    		<filter-name>characterEncodingFilter</filter-name>
    		<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    		<init-param>
    			<param-name>encoding</param-name>
    			<param-value>UTF-8</param-value>
    		</init-param>
    		<init-param>
    			<param-name>forceEncoding</param-name>
    			<param-value>true</param-value>
    		</init-param>
    	</filter>
    	
      
      <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
        	<param-name>contextConfigLocation</param-name>
        	<param-value>classpath*:/spring-servlet.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
      </servlet>
      <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
      </servlet-mapping>
      
      <welcome-file-list>
        <welcome-file>/index.jsp</welcome-file>
      </welcome-file-list>
    </web-app>

实体User

package com.csair.entity;
    
    import javax.persistence.Column;
    import javax.persistence.Entity;
    import javax.persistence.GeneratedValue;
    import javax.persistence.Id;
    import javax.persistence.Table;
    
    import org.hibernate.annotations.GenericGenerator;
    @Entity
    @Table(name="i_user")
    public class User {
    	/**
    	 * 
    	 */
    	private static final long serialVersionUID = 1L;
    	private Integer id;
    	private String username;
    	private String password;
    	
    	@Id
    	@GeneratedValue(generator="system-uuid")
    	@GenericGenerator(name="system-uuid",strategy="uuid")
    	public Integer getId() {
    		return id;
    	}
    	public void setId(Integer id) {
    		this.id = id;
    	}
    	
    	@Column(name="username")
    	public String getUsername() {
    		return username;
    	}
    	public void setUsername(String username) {
    		this.username = username;
    	}
    	
    	@Column(name="password")
    	public String getPassword() {
    		return password;
    	}
    	public void setPassword(String password) {
    		this.password = password;
    	}
    }

UserRepository 类如下：

package com.csair.repository;
    
    import org.springframework.data.jpa.repository.JpaRepository;
    
    import com.csair.entity.User;
    
    public interface UserRepository extends JpaRepository<User, Integer>{
    	
    }

UserService 接口

package com.csair.service;
    
    import com.csair.entity.User;
    
    public interface UserService {
        public User getUser(int id);
    }

接口实现类

package com.csair.service.Impl;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    
    import com.csair.entity.User;
    import com.csair.repository.UserRepository;
    import com.csair.service.UserService;
    @Service
    public class UserServiceImpl implements UserService {
        @Autowired
    	UserRepository repository;
    	public UserRepository getRepository() {
    		return repository;
    	}
    	@Override
    	public User getUser(int id) {
    		// TODO Auto-generated method stub
    		return repository.findOne(id);
    	}
    
    }

Controller 类如下：

package com.csair.controller;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.servlet.ModelAndView;
    
    import com.csair.entity.User;
    import com.csair.service.UserService;
    
    @Controller
    @RequestMapping(value="/user")
    public class UserController {
       @Autowired
       private UserService userSerivce;
       @RequestMapping(value="/welcome")
       public ModelAndView getUser(ModelAndView modelView)
       {
    	   User user = userSerivce.getUser(1);
    	    return new ModelAndView("welcome","user",user);
       }
    }

</pre><pre>

关于jsp 页面就不贴了 
    以上基本就是 SpringMVC +Hibernate JPA+Spring-data-jpa 开发环境集成。
    但是 问题来了：
    java.lang.ClassNotFoundException: org.springframework.data.mapping.IdentifierAccessor
    这个错网上很难找到答案，多数是说程序或者配置有问题。这个我自己也纠结了很久。不过最终还是解决了。
    这个问题主要是
    spring-data-commons.jar
    spring-data-jpa.jar 版本依赖问题。
    一般很难发现这个问题，因为版本就算依赖有问题也编译时代码不会报错，只有在发布的时候会报错。
     我遇到这个问题是因为我知道要以上两个包就去spring官网去下载 ，下载的时候没有考虑到版本依赖问题，后来程序跑不起来，总以为是自己配置有问题。然后各种改配置仍然不行。最后想了很久用了maven来下载包，依赖问题解决了。 这里建议如果在依赖不明的情况下，用maven下载包。这样就不会出现因为包依赖问题导致程序跑不起来，浪费自己的时间。

最后给一下实例地址

http://download.csdn.net/detail/lj1314ailj/8943455