Hibernate中的關系映射，最常見的關系映射之一就是多對多關系映射例如用戶與角色的關系，一個用戶對應多個角色，一個角色對應多個用戶。如圖：  Hibernate中如何來映射這兩個的關系呢？ 下面就為大家講解一下： 1、創建實體類User和實體類Role User.java ~~~ package com.bjpowernode.hibernate; import java.util.Set; public class User { private int id; private String name; private Set roles; 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 Set getRoles() { return roles; } public void setRoles(Set roles) { this.roles = roles; } } ~~~ Role.java ~~~ package com.bjpowernode.hibernate; public class Role { private int id; private String name; 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; } ~~~ 2、創建映射文件User.hbm.xml和Role.hbm.xml User.hbm.xml ~~~ <?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping> <class name="com.bjpowernode.hibernate.User" table="t_user"> <id name="id"> <generator class="native"/> </id> <property name="name"/> <set name="roles" table="t_user_role"> <key column="user_id"/> <many-to-many class="com.bjpowernode.hibernate.Role" column="role_id" /> </set> </class> </hibernate-mapping> ~~~ Role.hbm.xml ~~~ <?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping> <class name="com.bjpowernode.hibernate.Role" table="t_role"> <id name="id"> <generator class="native"/> </id> <property name="name"/> </class> </hibernate-mapping> ~~~ 3、效果圖