写Action的三种方法

Action类似于servlet,在用户对浏览器输入url访问的时候充当控制器的角色。它在访问时产生,执行execute()之后就销毁了。

写Action是代理事务,它实现的三种方式是: (1)POJO类

                     (2)继承ActionSupport类

                     (3)实现Action接口

POJO类

public class ActionPrint {

    public String execute(){
System.out.println("ActionPrint execute!");
return "success";
}
}

继承ActionSupport类

import com.opensymphony.xwork2.ActionSupport;

public class ActionInputCheck extends ActionSupport{
private int a;
private double b;
private char c;
private String d;
public int getA() {
return a;
}
public void setA(int a) {
this.a = a;
}
public double getB() {
return b;
}
public void setB(double b) {
this.b = b;
}
public char getC() {
return c;
}
public void setC(char c) {
this.c = c;
}
public String getD() {
return d;
}
public void setD(String d) {
this.d = d;
}
public String execute(){ return SUCCESS;
}
public void validate(){
if(a<0)
this.addActionError("d不能小于0"); } }

实现Action接口

import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ModelDriven; import Beans.User; public class MDriven implements Action,ModelDriven<User>{ private User user=new User();
public User getUser() {
return user;
} public void setUser(User user) {
this.user = user;
} @Override
public User getModel() {
// TODO Auto-generated method stub return user;
} @Override
public String execute() throws Exception {
ActionContext context=ActionContext.getContext();
context.getSession().put("username", user.getUsername());
return SUCCESS;
} }

ModelDriven接口是让javabean的实现和Action分离,Action只用扮演好控制器的角色就好,javabean是在Model层的东东,这样比较符合MVC的设计模式。

写了Action之后相应加上struts.xml的配置

           </action>
<action name="InputCheck" class="StrutsFund.ActionInputCheck">
<result name="success">/output.jsp</result>
</action>
<action name="MDriven" class="StrutsFund.MDriven">
<result name="success">/login_success.jsp</result>
</action>
<action name="print" class="StrutsFund.ActionPrint">
<result name="success">/index.jsp</result>
</action>

访问的时候就在网址栏中输入:http://localhost:8080/项目名/ActionName

struts.properties配置文件

该文件定义了struts2框架的大量属性。只要将该文件放在web应用的classes下,struts2框架就会自动加载。

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