[Struts2和WW] Struts2+Spring 当Action的Bean设置成Scope="session"时

bruceye

Struts2+Spring 当Action的Bean设置成Scope="session"时
如果Action有继承SessionAware,  ServletRequestAware, ServletResponseAware这三个接口
那么实现方法应该这样写

1. 
   
2. private final static ThreadLocal<Map> SESSION_THREADLOCAL = new ThreadLocal<Map>();
   
3. private final static ThreadLocal<HttpServletRequest> REQUEST_THREADLOCAL = new ThreadLocal<HttpServletRequest>();
   
4. private final static ThreadLocal<HttpServletResponse> RESPONSE_THREADLOCAL = new ThreadLocal<HttpServletResponse>();
   
5. public void setSession(Map session) {
   
6.   SESSION_THREADLOCAL.set(session);
   
7. }
   
8. public void setServletRequest(HttpServletRequest request) {
   
9.   REQUEST_THREADLOCAL.set(request);
   
10. }
    
11. public void setServletResponse(HttpServletResponse response) {
    
12.   RESPONSE_THREADLOCAL.set(response);
    
13. }
    
14. 
    
15. public Map getSession(){
    
16.   return SESSION_THREADLOCAL.get();
    
17. }
    
18. 
    
19. public HttpServletRequest getRequest(){
    
20.   return REQUEST_THREADLOCAL.get();
    
21. }
    
22. 
    
23. public HttpServletResponse getResponse(){
    
24.   return RESPONSE_THREADLOCAL.get();
    
25. }

复制代码

而不要写成

1. private Map session;
   
2. private HttpServletRequest request;
   
3. private HttpServletResponse response;
   
4. 
   
5. public void setSession(Map session) {
   
6.   this.session = session;
   
7. }
   
8. public void setServletRequest(HttpServletRequest request) {
   
9.   this.request = request;
   
10. }
    
11. public void setServletResponse(HttpServletResponse response) {
    
12.   this.response = response;
    
13. }
    
14. 
    
15. public Map getSession() {
    
16.   return session;
    
17. }
    
18. public HttpServletRequest getRequest() {
    
19.   return request;
    
20. }
    
21. public HttpServletResponse getResponse() {
    
22.   return response;
    
23. }

复制代码

为什么？
因为当同一个session高并发请求同一个Action的时候，成员变量会被各线程共用，将导致你非常沮丧。

同理，在Action中自己定义的成员变量也会有一样的情况发生。所以也要慎用。

不过这也是双刃剑。用得好的话，还是非常有利的。比如在编辑的时候可以省去很多hidden

[ 本帖最后由 bruceye 于 2010-4-7 16:51 编辑 ]

heyitang

謝謝 bruceye兄弟的分享!