1 區別

有狀態bean : 客戶端通過JNDI訪問有狀態bean, 服務端new該bean,并返回該代理對象

有狀態bean : 客戶端通過JNDI訪問有狀態bean, 服務端該bean是單例模式,并返回該代理對象

2 通過代碼看區別

服務端代碼

StatefulEjbI.java

package com.lesson.entity; /*** 有狀態的ejb接口* */ public interface StatefulEjbI {public void changeState(int state);public int getState(); }
StatefulEjbImpl.java

package com.lesson.entity;import javax.ejb.Remote; import javax.ejb.Stateful;/*** 有狀態的ejb實現* */ @Stateful @Remote public class StatefulEjbImpl implements StatefulEjbI{private int state;public void changeState(int state) {this.state += state ;}public int getState() {return state;}} StatelessEjbI.java

package com.lesson.entity; /*** 無狀態的ejb接口* */ public interface StatelessEjbI {public void changeState(int state);public int getState(); }
StatelessEjbImpl.java

package com.lesson.entity;import javax.ejb.Remote; import javax.ejb.Stateless;/*** 無狀態的ejb實現* */ @Stateless @Remote public class StatelessEjbImpl implements StatelessEjbI{private int state;public void changeState(int state) {this.state += state ;}public int getState() {return state;}}

客戶端代碼

StatefulClient.java

package com.lesson;import javax.naming.InitialContext; import javax.naming.NamingException;import com.lesson.entity.StatefulEjbI; import com.lesson.entity.StatefulEjbImpl;/*** 有狀態的客戶端* */ public class StatefulClient {public static void main(String[] args) throws NamingException {InitialContext context = new InitialContext();System.out.println("有狀態Stateful第一次會話");StatefulEjbI statefulEjbI = (StatefulEjbI)context.lookup("StatefulEjbImpl/remote");for(int i = 0 ; i < 10 ; i++){statefulEjbI.changeState(1);System.out.println("state1 = " + statefulEjbI.getState());}System.out.println("有狀態Stateful第二次會話");StatefulEjbI statefulEjbI2 = (StatefulEjbI)context.lookup("StatefulEjbImpl/remote");for(int i = 0 ; i < 10 ; i++){statefulEjbI2.changeState(1);System.out.println("state2 = " + statefulEjbI2.getState());}}}
StatelessClient.java

package com.lesson;import javax.naming.InitialContext; import javax.naming.NamingException;import com.lesson.entity.StatefulEjbI; import com.lesson.entity.StatelessEjbI; /*** 無狀態的客戶端* */ public class StatelessClient {public static void main(String[] args) throws NamingException {InitialContext context = new InitialContext();System.out.println("無狀態Stateful第一次會話");StatelessEjbI statelessEjbI = (StatelessEjbI)context.lookup("StatelessEjbImpl/remote");for(int i = 0 ; i < 10 ; i++){statelessEjbI.changeState(1);System.out.println("state1 = " + statelessEjbI.getState());}System.out.println("無狀態Stateful第二次會話");StatelessEjbI statelessEjbI2 = (StatelessEjbI)context.lookup("StatelessEjbImpl/remote");for(int i = 0 ; i < 10 ; i++){statelessEjbI2.changeState(1);System.out.println("state2 = " + statelessEjbI2.getState());}}} 3 輸出結果

有狀態客戶端輸出

無狀態的客戶端輸出

從輸出結果來看,有狀態是每次new一個對象,無狀態采用單例模式,每次都是同一個對象

4 代碼下載 : ?點擊下載

總結

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