Servlet Tread tips

最新推荐文章于 2022-08-21 16:55:34 发布

最新推荐文章于 2022-08-21 16:55:34 发布 · 63 阅读

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#Servlet

本文探讨了当Servlet处理多个客户端请求时可能出现的线程安全问题，并提出了四种解决方法：使用同步关键字、局部变量赋值、同步代码块以及接受不进行同步所带来的后果。

If your servlets only read from the request, write to the response, and save information in local variables, you needn't worry about the interaction among these threads. Once any information is saved in nonlocal variables, however, you must be aware that each of these client threads has the ability to manipulate a servlet's nonlocal variables. (Java Servlet Programming, Jason Hunter)

we can deal with this problem in 4 methods:

1. in the declare, use " public synchronized void doGet(...,...)"

2.in the function, use " synchronized(this){ //do things about nonlocal variables} "

3.in the function, assign the value of nonlocal variable to a (temp) local variable, then after " synchronized(this){ //do things about nonlocal variables, and assign the value of nonlocal variable to a (temp) local variable} "

4. decide that we are willing to suffer the consequences of ignoring synchronization issues.