4.多对多单向关联(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();Role r1 = new Role();r1.setName("数据录入人员");session.save(r1);Role r2 = new Role();r2.setName("商务主管");session.save(r2);Role r3 = new Role();r3.setName("商务经理");session.save(r3);Role r4 = new Role();r4.setName("项目会计");session.save(r4);User u1 = new User();u1.setName("张三");Set u1Roles = new HashSet();u1Roles.add(r1);u1Roles.add(r2);u1.setRoles(u1Roles);session.save(u1);User u2 = new User();u2.setName("李四");Set u2Roles = new HashSet();u2Roles.add(r1);u2Roles.add(r2);u2Roles.add(r3);u2.setRoles(u2Roles);session.save(u2);User u3 = new User();u3.setName("王五");Set u3Roles = new HashSet();u3Roles.add(r3);u3Roles.add(r4);u3.setRoles(u3Roles);session.save(u3);session.getTransaction().commit();}catch(Exception e) {e.printStackTrace();session.getTransaction().rollback();}finally {HibernateUtils.closeSession(session);}}public void testLoad1() {Session session = null;try {session = HibernateUtils.getSession();session.beginTransaction();User user = (User)session.load(User.class, 2);System.out.println(user.getName());for (Iterator iter=user.getRoles().iterator(); iter.hasNext();) {Role role = (Role)iter.next();System.out.println(role.getName());}session.getTransaction().commit();}catch(Exception e) {e.printStackTrace();session.getTransaction().rollback();}finally {HibernateUtils.closeSession(session);}}}