4.多对多双向关联(用户对角色) 测试

package com.bjpowernode.hibernate;import java.util.HashSet;import java.util.Iterator;import java.util.Set;import org.hibernate.Session;import junit.framework.TestCase;public class Many2ManyTest extends TestCase {public void testSave1() {Session session = null;try {session = HibernateUtils.getSession();session.beginTransaction();User u1 = new User();u1.setName("张三");session.save(u1);User u2 = new User();u2.setName("李四");session.save(u2);User u3 = new User();u3.setName("王五");session.save(u3);Role role = new Role();role.setName("动力节点");Set<User> users = new HashSet<User>();users.add(u1);users.add(u2);users.add(u3);role.setUsers(users);session.save(role);session.getTransaction().commit();} catch (Exception e) {e.printStackTrace();session.getTransaction().rollback();} finally {HibernateUtils.closeSession(session);}}public void testLoad2() {Session session = null;try {session = HibernateUtils.getSession();session.beginTransaction();Role role = (Role) session.load(Role.class, 1);System.out.println(role.getName());for (Iterator iter = role.getUsers().iterator(); iter.hasNext();) {User user = (User) iter.next();System.out.println(user.getName());}session.getTransaction().commit();} catch (Exception e) {e.printStackTrace();session.getTransaction().rollback();} finally {HibernateUtils.closeSession(session);}}}