1. 数据库连接配置文件

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
       "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
        <!-- Database connection settings -->
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql://localhost:3306/test?useUnicode=true&amp;characterEncoding=utf8</property>
        <property name="connection.username">root</property>
        <property name="connection.password">admin</property>
        <!-- SQL dialect -->
        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
        <property name="current_session_context_class">thread</property>
        <property name="show_sql">true</property>
        <property name="hbm2ddl.auto">update</property>
        <mapping resource="pojo/Product.hbm.xml" />
        <mapping resource="pojo/Category.hbm.xml" />
        <mapping resource="pojo/User.hbm.xml" />
    </session-factory>
</hibernate-configuration>

1. 建表语句

CREATE TABLE product_ (
  id int(11) NOT NULL AUTO_INCREMENT,
  name varchar(30) ,
  price float ,
  PRIMARY KEY (id)
) DEFAULT CHARSET=UTF8;

1. java的pojo类

package pojo;

import java.util.Set;

public class Product {

    private int id;

    private String name;

    private float price;

    private Category category;

    private Set<User> users;

    public Set<User> getUsers() {
        return users;
    }

    public void setUsers(Set<User> users) {
        this.users = users;
    }

    public Category getCategory() {
        return category;
    }

    public void setCategory(Category category) {
        this.category = category;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public float getPrice() {
        return price;
    }

    public void setPrice(float price) {
        this.price = price;
    }
}

1. pojo类和对应表的配置文件

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="pojo">
    <class name="Product" table="product_">
        <id name="id" column="id">
            <generator class="native">
            </generator>
        </id>
        <property name="name" />
        <property name="price" />
        <many-to-one name="category" class="Category" column="cid" />

        <set name="users" table="user_product" lazy="false">
            <key column="pid" />
            <many-to-many column="uid" class="User" />
        </set>
    </class>
</hibernate-mapping>