ssh_maven之service开发
我们已经完成了dao的开发，我们现在开始开发我们的service层，首先，我们的maven项目我们service要依赖我们的到层的依赖，我们可以在我们ssh_service的pom.xml中引入我们dao的一个依赖，下面是ssh_service/pom.xml
<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>
<parent>
<groupId>com.itheima</groupId>
<artifactId>ssh_parent</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<artifactId>ssh_service</artifactId>
<dependencies>
<dependency>
<groupId>com.itheima</groupId>
<artifactId>ssh_dao</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
</dependencies>
</project>
首先我们先看我们的目录结构
我们的CustomerService
package com.itheima.service; import java.util.List; import com.itheima.entity.Customer; public interface CustomerService { /** * 添加一个客户 */ public void saveCustomer(Customer customer); /** * 插叙所有的客户信息 */ public List<Customer> findAllCustomer(); }
我们的CustomerServiceImpl
package com.itheima.service.impl; import java.util.List; import com.itheima.dao.CustomerDao; import com.itheima.entity.Customer; import com.itheima.service.CustomerService; public class CustomerServiceImpl implements CustomerService { private CustomerDao customerDao; public void saveCustomer(Customer customer) { customerDao.saveCustomer(customer); } public List<Customer> findAllCustomer() { return customerDao.findAllCustomer(); } public void setCustomerDao(CustomerDao customerDao) { this.customerDao = customerDao; } }
我们的applicationContext-service.xml
注意：我们需要引入我们的applicationContext-dao.xml文件，因为我们的customerDao对象是在改文件中进行配置的
<?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:aop="http://www.springframework.org/schema/aop" 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.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"> <import resource="classpath:applicationContext-dao.xml"/> <bean id="customerService" class="com.itheima.service.impl.CustomerServiceImpl"> <property name="customerDao" ref="customerDao"></property> </bean> </beans>
我们可以写个测试类进行测试
package com.itheima.test; import java.util.List; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import com.itheima.entity.Customer; import com.itheima.service.CustomerService; public class CustomerServiceTest { @Test public void findAllCustomerTest(){ ApplicationContext ac = new ClassPathXmlApplicationContext("classpath:applicationContext-service.xml"); CustomerService customerService = (CustomerService) ac.getBean("customerService"); List<Customer> customers = customerService.findAllCustomer(); for (Customer customer : customers) { System.out.println(customer); } } @Test public void saveCustomerTest(){ ApplicationContext ac = new ClassPathXmlApplicationContext("classpath:applicationContext-service.xml"); CustomerService customerService = (CustomerService) ac.getBean("customerService"); Customer customer = new Customer(); customer.setCustName("黄忠"); customerService.saveCustomer(customer); } }
这里，我们测试的话，第一个方法findAllCustomer没有问题，但是第二个会出现问题
下面我们看看这个错误
javax.validation.ValidationException: HV000183: Unable to load 'javax.el.ExpressionFactory'. Check that you have the EL dependencies on the classpath, or use ParameterMessageInterpolator instead at org.hibernate.validator.internal.engine.ValidatorFactoryImpl.createValidator(ValidatorFactoryImpl.java:339) at org.hibernate.validator.internal.engine.ValidatorContextImpl.getValidator(ValidatorContextImpl.java:122) at org.hibernate.cfg.beanvalidation.BeanValidationEventListener.validate(BeanValidationEventListener.java:111) at org.hibernate.cfg.beanvalidation.BeanValidationEventListener.onPreInsert(BeanValidationEventListener.java:78) at org.hibernate.action.internal.EntityIdentityInsertAction.preInsert(EntityIdentityInsertAction.java:197) at org.hibernate.action.internal.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:75) at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:597) at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:232) at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:213) at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:256) at org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:317) at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:272) at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:178) at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:109) at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:192) at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:38) at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:177) at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:32) at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:73) at org.hibernate.internal.SessionImpl.fireSave(SessionImpl.java:679) at org.hibernate.internal.SessionImpl.save(SessionImpl.java:671) at org.hibernate.internal.SessionImpl.save(SessionImpl.java:666) at org.springframework.orm.hibernate5.HibernateTemplate$12.doInHibernate(HibernateTemplate.java:620) at org.springframework.orm.hibernate5.HibernateTemplate$12.doInHibernate(HibernateTemplate.java:616) at org.springframework.orm.hibernate5.HibernateTemplate.doExecute(HibernateTemplate.java:341) at org.springframework.orm.hibernate5.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:309) at org.springframework.orm.hibernate5.HibernateTemplate.save(HibernateTemplate.java:616) at com.itheima.dao.impl.CustomerDaoImpl.saveCustomer(CustomerDaoImpl.java:13) at com.itheima.service.impl.CustomerServiceImpl.saveCustomer(CustomerServiceImpl.java:14) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:302) at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99) at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:208) at com.sun.proxy.$Proxy29.saveCustomer(Unknown Source) at com.itheima.test.CustomerServiceTest.saveCustomerTest(CustomerServiceTest.java:29) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222) at org.junit.runners.ParentRunner.run(ParentRunner.java:300) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
异常解决：
在父工程的pom.xml中导入，就行了
