[英]Java: Using filter (user logged/user not logged)
I need to write a code, that will be redirecting to different *.jsp sites depending on whether user is logged on or not logged on. 我需要编写一个代码,该代码将根据用户是否登录而重定向到不同的* .jsp站点。 I found a hint, that I can use filter to do it and I need to use doFilter or/along with init methods. 我发现了一个提示,我可以使用过滤器来执行此操作,并且需要在init方法中使用doFilter或/以及其他方法。 Any ideas? 有任何想法吗?
public void doFilter(ServletRequest req, ServletResponse res,
FilterChain chain) throws IOException, ServletException {
}
public void init(FilterConfig config) throws ServletException {
}
This is a very basic sample...but let's suppose that the login proces set in session an attribute called "user" in the doFilter method you can do something like this 这是一个非常基本的示例...但是让我们假设登录过程在会话中设置了doFilter方法中名为“ user”的属性,您可以执行以下操作
if( request.getSession().getAttribute("user") == null )
{
//User not logged...redirect
}
else
{
//Normal filter execution
}
init()
method will be called on Filter's initialization and doFilter()
will be called when a request is made and Filter
is mapped to filter those request init()
方法将在Filter的初始化时调用,并且doFilter()
将在发出请求时被调用,并且Filter
被映射为过滤这些请求
Related: 有关:
For an example, see Filters Tutorial , particularly the section titled Authentication with Filters. 有关示例,请参阅“ 过滤器教程” ,特别是标题为“使用过滤器进行身份验证”的部分。 (There's a typo that actually makes this say "Authentication with Filers" but that is the section I am referring to...obviously it is supposed to say filters :) (实际上有一个错字,就是说“通过文件管理器验证”,但这是我要指的部分...显然应该说过滤器:)
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