SSH里怎查询两个表得数据显示在jsp里呢？
就是，有两个表，主表是Role ,从表是User ,是一对多的关系。怎查询主表，带出从表的数据。
实体类：Role
public class Role {
private Integer roleid;
private String rolename;
private Set<User> users;
private User user;
实体类：User
public class User {
private Integer id;
private String username;
private String sex;
private Role role;
Role.hbm.xml:
<?xml version='1.0' encoding='UTF-8'?>
<!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.test.bean.Role" table="T_Role">
  <id name="roleid" type="java.lang.Integer" column="roleid">
   <generator class="increment"></generator>
  </id>

  <property name="rolename" type="string" column="rolename" not-null="false" length="50" lazy="false"></property>
 <set name="users" inverse="true" lazy="false">
<key column="rid"
foreign-key="fk_user_rid_role_id"
not-null="true"/>
<one-to-many class="com.test.bean.User" />
</set>
</class>
  </hibernate-mapping>
User.hbm.xml:
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- 
    Mapping file autogenerated by MyEclipse Persistence Tools
-->
<hibernate-mapping>
    <class name="com.test.bean.User" table="t_user" >
        <id name="id" type="java.lang.Integer">
            <column name="id" />
            <generator class="native" />
        </id>
        <property name="username" type="java.lang.String">
            <column name="username" length="50" />
        </property>
        <property name="sex" type="java.lang.String">
            <column name="sex" length="50" />
        </property>
        <!-- 
        <many-to-one name="role" foreign-key="fk_user_rid_role_id" lazy="false">
<column name="rid" not-null="false"/>
</many-to-one>
 -->
<many-to-one name="role" class="com.test.bean.Role" column="rid"  lazy="false"></many-to-one>
    </class>