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

<dependency>  
    <groupId>javax.el</groupId>  
    <artifactId>javax.el-api</artifactId>  
    <version>2.2.4</version>  
</dependency>  
<dependency>  
    <groupId>org.glassfish.web</groupId>  
    <artifactId>javax.el</artifactId>  
    <version>2.2.4</version>  
</dependency>

　　这样的话，我们的service模块也开发好了，只剩下我们的controller层了！

　　

　　

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原文地址：https://www.cnblogs.com/wh-share/p/ssh_maven_service.html