Filter 问题，我要通过 Filter 做一个1分钟内限制请求次数的程序

[dfjjhb]

我要通过 Filter 做一个1分钟内限制请求次数的程序。基本思想是这样，先记录一个开始时间，

当请求过来时先判断时间是否已经过了你要求的时间，计数器清零，然后在++，如果没有过那么

就直接判断是否已过了你要求的数目上限。下边是已经完成的程序，高手补充下，谢谢。
public class SessionSingleFilter implements Filter {

private static final Logger LOG = Logger.getLogger(SessionSingleFilter.class);

public void init(FilterConfig filterConfig) throws ServletException {
}

public void doFilter(ServletRequest servletRequest, ServletResponse

servletResponse, FilterChain filterChain)
throws IOException, ServletException {
filterChain.doFilter(servletRequest, servletResponse);
System.out.println("Filter66");

Calendar c =Calendar.getInstance();
Date date = c.getTime();
HttpServletRequest httpServletRequest=(HttpServletRequest)servletRequest;
HttpServletResponse httpServletResponse=(HttpServletResponse)servletResponse;
HttpSession httpsession=httpServletRequest.getSession();
Object jspzi= httpsession.getAttribute("a");
System.out.println(jspzi);


}

public void destroy() {
}
}

[abc130314]

    public void init(FilterConfig filterConfig) throws ServletException {
    }

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpSession session = ((HttpServletRequest) request).getSession();
        State state = (State) session.getAttribute("State");
        long currentTime = System.currentTimeMillis();
        if (state == null) {
            state = new State();
            state.endTime = currentTime + 间隔时间;
            session.setAttribute("State", state);
        }
        if (currentTime <= state.endTime) {
            state.time++;
        } else {
            state.endTime += 间隔时间;
            state.time = 1;
        }
        if (state.time <= 允许登录次数) {
            chain.doFilter(request, response);
        }
    }

    public void destroy() {
    }
    private static final long 间隔时间 = 1000 * 60;
    private static final int 允许登录次数 = 10;

    private class State {

        private long endTime;
        private int time;
    }

如果你不想用内部类，就用一个long[2];

[richard_2010]

mark下

[abc130314]

我QQ号19656842

[dfjjhb]

[Quote=引用 1 楼 abc130314 的回复:]
Java code
public void init(FilterConfig filterConfig) throws ServletException {
}

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
HttpSession session = ((HttpServletRequest) request).getSession();
State state = (State) session.getAttribute("State");
long currentTime = Syst…
[/Quote]
好的，呵呵，我先试试看，谢谢1楼的哥们

[dfjjhb]

[Quote=引用 1 楼 abc130314 的回复:]
Java code
public void init(FilterConfig filterConfig) throws ServletException {
}

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
HttpSession session = ((HttpServletRequest) request).getSession();
State state = (State) session.getAttribute("State");
long currentTime = Syst…
[/Quote]
System.currentTimeMillis() 这个时间是什么时间，单位是毫秒？怎么算出来的，我不懂这个时间的计算公式是怎么来得，给我解释一下吧。 state.endTime = currentTime + 间隔时间；间隔时间 是自己定义的变量吧？

[abc130314]

System.currentTimeMillis()——API上有。当前时间与协调世界时 1970 年 1 月 1 日午夜之间的时间差（以毫秒为单位测量）
private static final long 间隔时间 = 1000 * 60; —— 自己定义

[dfjjhb]

我现在想记录一下 filter的请求次数，如何实现保存filter请求次数功能呢？

[abc130314]

state 加一个属性 int totalTime

state.totalTime++;

if (currentTime <= state.endTime) {
……

[dfjjhb]

state 加一个属性 int totalTime

state.totalTime++;

if (currentTime <= state.endTime) {
……

state 类里面吗？ 记录 请求 次数 需要 记录 doFilter()？

[abc130314]

请求一次，就会过滤一次。次数一样的。

[dfjjhb]

你的意思是直接加个 记录总时间变量就可以 记录 过去的请求次数了？
你msn是多少？或者qq号也行，请教请教，呵呵