Stateful & Stateless EJB

无状态session

package com.kevin.ejb;

import javax.ejb.Remote;
import javax.ejb.Stateless;

// 其实是一个sigleton模式
@Stateless
@Remote
public class StatelessEjbBean implements StatelessEjb {

	// stateless bean中的成员变量必须要用static修饰(类级别的属性)
	public static int result = 0;
	
	public int compute(int i) {
		result = result + i;
		return result;
	}

	public int getResult() {
		System.out.println("server getResult: " + result);
		return result;
	}

}

有状态session

package com.kevin.ejb;

import javax.ejb.Stateful;

// 不同的会话请求时，会重新new一个bean
@Stateful
public class StatefulEjbBean implements StatefulEjb {

	private int state;
	
	public int compute(int i) {
		state = state + i;
		return state;
	}
}