在多表映射配置時，我們應該遵循以下不步驟：

確定兩張表之間的關系

在數據庫中實現兩張表之間的關系建立

在實體類中描述出兩個實體類之間的關系

在映射配置文件中建立兩個實體和兩張表之間的關系
我們就按照上面的步驟做，我這里有一張聯系人表和一張客戶表，一對多關系，實體類代碼如下：

/*** 客戶的實體類* @author dengg**/ public class Customer {private Long custId;private String custName;private String custSource;private String custIndustry;private String custLevel;private String custAddress;private String custPhone;public Long getCustId() {return custId;}public void setCustId(Long custId) {this.custId = custId;}public String getCustName() {return custName;}public void setCustName(String custName) {this.custName = custName;}public String getCustSource() {return custSource;}public void setCustSource(String custSource) {this.custSource = custSource;}public String getCustIndustry() {return custIndustry;}public void setCustIndustry(String custIndustry) {this.custIndustry = custIndustry;}public String getCustLevel() {return custLevel;}public void setCustLevel(String custLevel) {this.custLevel = custLevel;}public String getCustAddress() {return custAddress;}public void setCustAddress(String custAddress) {this.custAddress = custAddress;}public String getCustPhone() {return custPhone;}public void setCustPhone(String custPhone) {this.custPhone = custPhone;}@Overridepublic String toString() {return "Customer [custId=" + custId + ", custName=" + custName + ", custSource=" + custSource+ ", custIndustry=" + custIndustry + ", custLevel=" + custLevel + ", custAddress=" + custAddress+ ", custPhone=" + custPhone + "]";}public Customer(Long custId, String custName) {super();this.custId = custId;this.custName = custName;}public Customer() {}} /*** 聯系人的實體類* @author dengg**/ public class LinkMan implements Serializable {private Long lkmId;private String lkmName;private String lkmPhone;private String lkmMobile;private String lkmEmail;private String lkmPosition;private String lkmMemo;public Long getLkmId() {return lkmId;}public void setLkmId(Long lkmId) {this.lkmId = lkmId;}public String getLkmName() {return lkmName;}public void setLkmName(String lkmName) {this.lkmName = lkmName;}public String getLkmPhone() {return lkmPhone;}public void setLkmPhone(String lkmPhone) {this.lkmPhone = lkmPhone;}public String getLkmMobile() {return lkmMobile;}public void setLkmMobile(String lkmMobile) {this.lkmMobile = lkmMobile;}public String getLkmEmail() {return lkmEmail;}public void setLkmEmail(String lkmEmail) {this.lkmEmail = lkmEmail;}public String getLkmPosition() {return lkmPosition;}public void setLkmPosition(String lkmPosition) {this.lkmPosition = lkmPosition;}public String getLkmMemo() {return lkmMemo;}public void setLkmMemo(String lkmMemo) {this.lkmMemo = lkmMemo;}@Overridepublic String toString() {return "LinkMan [lkmId=" + lkmId + ", lkmName=" + lkmName + ", lkmPhone=" + lkmPhone + ", lkmMobile="+ lkmMobile + ", lkmEmail=" + lkmEmail + ", lkmPosition=" + lkmPosition + ", lkmMemo=" + lkmMemo + "]";}}

第二步在數據庫中實現兩張表之間的關系建立，因為我用了hibernate，會自動創建，就不弄了
第三步在實體類中描述出兩個實體類之間的關系：
首先我們在Customer類中配置LinkMan類的關系，一個客戶對應多個聯系人
我們在Customer加入如下代碼：

private Set<LinkMan> likmans = new HashSet<LinkMan>(0);public Set<LinkMan> getLikmans() {return likmans;}public void setLikmans(Set<LinkMan> likmans) {this.likmans = likmans;}

主表應該包含從表實體的集合引用，用set集合來建立關系，再配置set和get方法，就行了。
接著配置LinkMan，加入代碼如下：

private Customer customer;public Customer getCustomer() {return customer;}public void setCustomer(Customer customer) {this.customer = customer;}

第四步在映射配置文件中建立兩個實體和兩張表之間的關系：
我們先打開Customer.hbm.xml文件，里面加入配置如下：

<set name="likmans" table="cust_linkman"><key column="lkm_cust_id"></key><one-to-many class="LinkMan"/></set>

name：就是我們在Customer類中設置set集合的名字
table：指定從表的名字，也就是聯系人表名
key：指定外鍵字段名
one-to-many:指定從表實體名稱
然后打開LinkMan.hbm.xml文件，在里面加入如下代碼：

<many-to-one name="customer" class="Customer" column="lkm_cust_id"></many-to-one>

name:從表實體引用主表實體對象引用的名稱嗎，就是在LinkMan類中設置Customer對象的名稱
class：指定屬性所對應的實體類名稱，就是Customer路徑
column：指定外鍵的名稱

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