Struts Action

.Struts2的Action可以不需实现任何接口或继承任何类，就是一个包含了execute()方法的POJO,下面是一个简单的Action的实现

 

Java代码

1. package com;   
2.   
3. import com.opensymphony.xwork2.ActionContext;   
4. public class LogonAction {   
5.     private String userName;   
6.     private String userPwd;   
7.     public String getUserName() {   
8.         return userName;   
9.     }   
10.     public void setUserName(String userName) {   
11.         this.userName = userName;   
12.     }   
13.     public String getUserPwd() {   
14.         return userPwd;   
15.     }   
16.     public void setUserPwd(String userPwd) {   
17.         this.userPwd = userPwd;   
18.     }   
19.     public String execute(){   
20.            
21.         if(userName.equals("callan") && userPwd.equals("fjf")){   
22.                
23.             // ActionContext的getSession()返回的不是一个HttpSession,是一个Map   
24.             // 但struts2的拦截器会负责该session与httpsession的转换   
25.             ActionContext.getContext().getSession().put("userName", "callan");   
26.             return "succee";   
27.         } else {   
28.             return "error";   
29.         }   
30.     }   
31. }  

package com;

import com.opensymphony.xwork2.ActionContext;
public class LogonAction {
	private String userName;
	private String userPwd;
	public String getUserName() {
		return userName;
	}
	public void setUserName(String userName) {
		this.userName = userName;
	}
	public String getUserPwd() {
		return userPwd;
	}
	public void setUserPwd(String userPwd) {
		this.userPwd = userPwd;
	}
	public String execute(){
		
		if(userName.equals("callan") && userPwd.equals("fjf")){
			
			// ActionContext的getSession()返回的不是一个HttpSession,是一个Map
			// 但struts2的拦截器会负责该session与httpsession的转换
			ActionContext.getContext().getSession().put("userName", "callan");
			return "succee";
		} else {
			return "error";
		}
	}
}

 

 

配置文件

 

Xml代码

1. <package name="logon" extends="struts-default">  
2.         <action name="logon" class="com.LogonAction">  

1.             <result name="succee">/logon/welcome.jsp</result>  
2.             <result name="error">/logon/error.jsp</result>  
3.         </action>  
4.  </package>  

<package name="logon" extends="struts-default">
        <action name="logon" class="com.LogonAction">
            <result name="succee">/logon/welcome.jsp</result>
            <result name="error">/logon/error.jsp</result>
        </action>
 </package>

 

 

当请求时,Struts运行时根据struts.xml里的Action映射,实例化com.LogonAction类,

默认情况下会调用其execute方法。不过我们可以通过配置改变他的方法,配置如下:

 

Xml代码

1. <action name="logon" method="userLogon" class="com.LogonAction">  
2.             <result name="succee">/logon/welcome.jsp</result>  
3.             <result name="error">/logon/error.jsp</result>  
4.  </action>  

<action name="logon" method="userLogon" class="com.LogonAction">
            <result name="succee">/logon/welcome.jsp</result>
            <result name="error">/logon/error.jsp</result>
 </action>

 

 

Method配置调用的方法名为userLogon,这时当请求logon.action时会调用userLogon()方法，不会在去调用默认的execute()方法

 

 

 

2. 虽然Action可以不实现任何接口或继承任何类,但大多数情况下都会继承com.opensymphony.xwork2.ActionSupport类，并重载execute()方法．(比如说我们需要request和response对象时)

 

Java代码

1. public class LogonAction2 extends ActionSupport{   
2.     private String userName;   
3.     private String userPwd;   
4.     public String getUserName() {   

1.         return userName;   
2.     }   
3.     public void setUserName(String userName) {   
4.         this.userName = userName;   
5.     }   
6.     public String getUserPwd() {   
7.         return userPwd;   
8.     }   
9.     public void setUserPwd(String userPwd) {   
10.         this.userPwd = userPwd;   
11.     }   
12.     public String execute(){   
13.         // 得到request对象   
14.         HttpServletRequest request = ServletActionContext.getRequest();   
15.         HttpServletResponse response = ServletActionContext.getResponse();   
16.         return SUCCESS;   
17.     }   
18. }  

public class LogonAction2 extends ActionSupport{
	private String userName;
	private String userPwd;
	public String getUserName() {
		return userName;
	}
	public void setUserName(String userName) {
		this.userName = userName;
	}
	public String getUserPwd() {
		return userPwd;
	}
	public void setUserPwd(String userPwd) {
		this.userPwd = userPwd;
	}
	public String execute(){
		// 得到request对象
		HttpServletRequest request = ServletActionContext.getRequest();
		HttpServletResponse response = ServletActionContext.getResponse();
		return SUCCESS;
	}
}

 

 

SUCCESS是在ActionSupport定义的,同时还定义了ERROR,INPUT,LOGIN,NONE,在配置result的name时,他们的值分别为success,error,input,login,none 3.继承ActionSupport类能得到request,response等对象,通过ioc方式也能得到request,response(实现ServletRequestAware, ServletResponseAware接口)

 

Java代码

1. public class LogonAction implements SessionAware, ServletRequestAware, ServletResponseAware {   
2.     private String userName;   
3.     private String userPwd;    
4.     private Map session;   
5.     private HttpServletRequest request;    
6.     private HttpServletResponse response;   
7.     public String execute(){   
8.         // session是一个map   
9.         // struts2的拦截器会负责该session与httpsession的转换   
10. // 在页面上取值和在session中取一样.session.getAttribute(userName)   
11.         session.put("userName", "callan");   
12.            
13.         return "succee";   
14.            
15.     }   
16.     public void setSession(Map session) {   
17.         this.session = session;   
18.     }   
19.     public void setServletRequest(HttpServletRequest request) {   
20.         this.request = request;   
21.     }   
22.     public void setServletResponse(HttpServletResponse response) {   
23.         this.response = response;   
24.     }   
25.     public String getUserName() {   
26.         return userName;   
27.     }   
28.     public void setUserName(String userName) {   
29.         this.userName = userName;   
30.     }   
31.     public String getUserPwd() {   
32.         return userPwd;   
33.     }   
34.     public void setUserPwd(String userPwd) {   
35.         this.userPwd = userPwd;   
36.     }   
37. }