uploadify出现http 302错误解决方案

 当上传图片时出现 HTTP ERROR 302　错误,　这是服务端需要登录验证，而客户端uploadify 并没有把　cookie　中的 sessionId 发送给服务器 ，如果有拦截或过滤的话，请求就会被重置，这样就会出现302错误了。

 

网上有一种解决方法就是在请求后面加上 sessionId （http://fanshuyao.iteye.com/admin/blogs/1751684），但好像也不怎么行。现在通过实现HttpSessionListener的sessionCreated和sessionDestroyed 能很好解决问题。

 

步骤如下：

1、建立自己的SessionContext

/**
 * session管理，解决uploadify session丢失问题
 * @author lqy
 * @date 2013-1-29
 */
public class MySessionContext {
private static MySessionContext instance;
private HashMap<String, HttpSession> mymap;

private MySessionContext() {
mymap = new HashMap<String, HttpSession>();
}

public static MySessionContext getInstance() {
if (instance == null) {
instance = new MySessionContext();
}
return instance;
}

public synchronized void addSession(HttpSession session) {
if (session != null) {
mymap.put(session.getId(), session);
}
}

public synchronized void delSession(HttpSession session) {
if (session != null) {
mymap.remove(session.getId());
}
}

public synchronized HttpSession getSession(String session_id) {
if (session_id == null)
return null;
return (HttpSession) mymap.get(session_id);
}

}

/**
 * session管理，解决uploadify session丢失问题
 * @author lqy
 * @date 2013-1-29
 */
public class MySessionContext {
	private static MySessionContext instance;
	private HashMap<String, HttpSession> mymap;

	private MySessionContext() {
		mymap = new HashMap<String, HttpSession>();
	}

	public static MySessionContext getInstance() {
		if (instance == null) {
			instance = new MySessionContext();
		}
		return instance;
	}

	public synchronized void addSession(HttpSession session) {
		if (session != null) {
			mymap.put(session.getId(), session);
		}
	}

	public synchronized void delSession(HttpSession session) {
		if (session != null) {
			mymap.remove(session.getId());
		}
	}

	public synchronized HttpSession getSession(String session_id) {
		if (session_id == null)
			return null;
		return (HttpSession) mymap.get(session_id);
	}

}

2、新增一个Session监听类

/**
 * Session监听器
 * @author lqy
 * @date 2013-1-29
 */
public class SessionListener implements HttpSessionListener {

public static Map<String,HttpSession> userMap = new HashMap<String,HttpSession>();

private MySessionContext myc = MySessionContext.getInstance();

public void sessionCreated(HttpSessionEvent httpSessionEvent) {
myc.addSession(httpSessionEvent.getSession());
}

public void sessionDestroyed(HttpSessionEvent httpSessionEvent) {
HttpSession session = httpSessionEvent.getSession();
myc.delSession(session);
}

}

/**
 * Session监听器
 * @author lqy
 * @date 2013-1-29
 */
public class SessionListener implements HttpSessionListener {

	public static Map<String,HttpSession> userMap = new HashMap<String,HttpSession>();
	
	private MySessionContext myc = MySessionContext.getInstance();

	public void sessionCreated(HttpSessionEvent httpSessionEvent) {
		myc.addSession(httpSessionEvent.getSession());
	}

	public void sessionDestroyed(HttpSessionEvent httpSessionEvent) {
		HttpSession session = httpSessionEvent.getSession();
		myc.delSession(session);
	}

}