接着我们就必须来完成Bean实体自己了。这个实体所做的工作与session bean中的工做大致相同，但是它的继承的父类不是session bean了而是EntiyBean了。具体代码如下：
package net.chinacode.addressbook;
import javax.ejb.*;
import java.rmi.*;
public class AddressEntryBean extends Object implements EntityBean {
public static int instanceCount = 0;
private transient TraceHelper tracer;
public AddressEntryBean() {
int instanceNr = instanceCount++;
tracer = new TraceHelper("AddressEntryBean[" + instanceCount + ']');
tracer.trace("");
}
public String name;
public String address;
public String city;
public String getName() {
tracer.trace("getName", name);
return name;
}
public String getAddress() {
tracer.trace("getAddress", address);
return address;
}
public String getCity() {
tracer.trace("getCity", city);
return city;
}
public void setAddress(String newAddress) {
tracer.trace("setAddress", new String[] { newAddress });
address = newAddress;
}
public void setCity(String newCity) {
tracer.trace("setCity", new String[] { newCity });
city = newCity;
}
public void ejbActivate() {
tracer.trace("ejbActivate");
}
public void ejbStore() {
tracer.trace("ejbStore");
}
public void setEntityContext(EntityContext entityContext) {
tracer.trace("setEntityContext",
new String[] { String.valueOf(entityContext) });
}
public void unsetEntityContext() {
tracer.trace("unsetEntityContext");
}
public void ejbPassivate() {
tracer.trace("ejbPassivate");
}
public void ejbLoad() {
tracer.trace("ejbLoad");
}
public void ejbRemove() {
tracer.trace("ejbRemove");
}
public String ejbCreate(String initialName,
String initialAddress,
String initialCity)
throws CreateException, RemoteException {
tracer.trace("ejbCreate", new String[] { initialName,
initialAddress,
initialCity }, initialName);
name = initialName;
address = initialAddress;
city = initialCity;
return initialName;
}
public void ejbPostCreate(String initialName,
String initialAddress,
String initialCity)
throws CreateException, RemoteException {
tracer.trace("ejbPostCreate", new String[] { initialName,
initialAddress,
initialCity} );
}
}
我们将这段代码存入hdsite\src\java\net\chinacode\addressbook\AddressEntryBean.java文件中。这里使用了一个tracer的TraceHelper类，它只是用来向orion终端输入调试信息的。除去了tracer的代码，哪么剩余的代码已经变的很少了，而且好像没有任何操作的地方。这就是EJB帮助我们完成了所有的事。
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