(主控方)
Person.java
Person {
      private String username;
      //对被控方的引用
      private Address address;
      public String getUsername() {
            return username;
      }
      public void setUsername(String username) {
            this.username = username;
      }
      public Address getAddress() {
            return address;
      }
      public void setAddress(Address address) {
            this.address= address;
      }
}
(被动方)
Address.java
Address{
      private String addressName;
      //对主控方的引用
      private Person person;
      public String getAddressName() {
            return addressName;
      }
      public void setAddressName(String addressName) {
            this.addressName= addressName;
      }
      public Person getPerson() {
            return person;
      }
      public void setPerson(Person person) {
            this.person= person;
      }
      public String toString() {
            return new ToStringBuilder(this).
            append("addressName", addressName).
            toString();
      }
      public boolean equals(Object o) {
            if ( !(o instanceof Address) {
                  return false;
            }
            Address rhs = (Address) o;
            return new EqualsBuilder()
            .appendSuper(super.equals(o))
            .append(this.addressName, rhs.getAddressName())
            .isEquals();
      }
      public int hashCode() {
            return new HashCodeBuilder(17, 37).
            append(addressName).
            toHashCode();
      }
}

<class name="Person" table="person">
<id name="id" type="long" column="id">
<generator class="native"/>
</id>
<property name="username" column="username" type="string"/>
<one-to-one
name="address"
class="Address"
cascade="all"
constrained="false"
/>
</class>
<class name="Address" table="Address" >
<id name="id" column="id">
<generator class="foreign">
<param name="property">person</param>
</generator>
</id>
<one-to-one name="person" class="Person" constrained="true"/>
<property name="addressName" column="addressName" type="string"/>