1.pom.xml

       
      
       4.0.0
        
      
       com.jin.jpa
        
      
       jpamaven
        
      
       0.0.1-SNAPSHOT
        
      
       jar
        
      
       jpamaven
        
      
       http://maven.apache.org
        
          
       
        UTF-8
           
       
        4.1.7.Final
       	  
        
          
             
        
         junit
              
        
         junit
              
        
         3.8.1
              
        
         test
            
           
       			
        
         org.hibernate
        			
        
         hibernate-entitymanager
        			
        
         ${project.hibernate.version}
        		
       				
       		
       			
        
         org.hibernate
        			
        
         hibernate-c3p0
        			
        
         ${project.hibernate.version}
        		
       				
       			
        
         log4j
        			
        
         log4j
        			
        
         1.2.17
        		
       		
       		 
       			
        
         mysql
        			
        
         mysql-connector-java
        			
        
         5.1.21
        		
       		  
      
     

2.在src/main/resources目录下包含两个文件

  2.1 src/main/resources/META-INF/persistence.xml

  

       
      
       4.0.0
        
      
       com.jin.jpa
        
      
       jpamaven
        
      
       0.0.1-SNAPSHOT
        
      
       jar
        
      
       jpamaven
        
      
       http://maven.apache.org
        
          
       
        UTF-8
           
       
        4.1.7.Final
             
        
          
             
        
         junit
              
        
         junit
              
        
         3.8.1
              
        
         test
            
           
                   
        
         org.hibernate
                    
        
         hibernate-entitymanager
                    
        
         ${project.hibernate.version}
                
                       
               
                   
        
         org.hibernate
                    
        
         hibernate-c3p0
                    
        
         ${project.hibernate.version}
                
                       
                   
        
         log4j
                    
        
         log4j
                    
        
         1.2.17
                
               
                
                   
        
         mysql
                    
        
         mysql-connector-java
                    
        
         5.1.21
                
                 
      
     

2.2 src/main/resources/log4j.xml

3.写一个bean来测试这个环境

 src/main/java/com/jin/beans/Person.java

1 package com.jin.beans; 2  3 import javax.persistence.Entity; 4 import javax.persistence.GeneratedValue; 5 import javax.persistence.Id; 6  7 @Entity 8 public class Person { 9 10     @Id @GeneratedValue11     private Integer id;12     private String name;13     public Integer getId() {14         return id;15     }16     public void setId(Integer id) {17         this.id = id;18     }19     public String getName() {20         return name;21     }22     public void setName(String name) {23         this.name = name;24     }25     public Person(String name) {26         super();27         this.name = name;28     }29     public Person() {30         super();31         // TODO Auto-generated constructor stub32     }33     @Override34     public String toString() {35         return "Person [id=" + id + ", name=" + name + "]";36     }37     38 }

4.测试

src/test/java/com/jin/jpa/PersonTest.java

1 public class PersonTest { 2  3     @Test 4     public void save() { 5         EntityManagerFactory factory = Persistence.createEntityManagerFactory("persistence-unit_demo"); 6         EntityManager manager = factory.createEntityManager(); 7         manager.getTransaction().begin(); 8         manager.persist(new Person("小天天")); 9         manager.getTransaction().commit();10         manager.close();11         factory.close();12     }13     14 }

代码结构图：