如何在java中跳过过滤器链中的过滤器 [英] How to skip a filter in the filter chain in java

问题描述

我的应用程序中有2个过滤器。基于某些条件，我想选择是否执行第二个过滤器。有没有办法做到这一点？

I have 2 filters in my application. Based on some condition, I want to choose whether to execute the second filter or not. Is there a way to do this?

我做了一些谷歌搜索没有成功。我希望请求继续而不执行第二个过滤器。这可能吗？

I did some googling with no success. I want the request to continue without executing the second filter. Is that possible?

任何帮助都将不胜感激。

Any help will be appreciated.

推荐答案

您可以在请求中设置属性并在第二个过滤器中进行检查。

You can set an Attribute in your request and check it in your second filter.

public class FirstFilter implements Filter {
    //...

    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        servletRequest.setAttribute("executeSecondFilter", true);
        //...
        if(someReason)
            servletRequest.setAttribute("executeSecondFilter", false);
        filterChain.doFilter(servletRequest, servletResponse);
    }
}

public class SecondFilter implements Filter {
    //..

    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        if (servletRequest.getAttribute("executeSecondFilter") == null || !((Boolean) servletRequest.getAttribute("executeSecondFilter"))) {
            filterChain.doFilter(servletRequest, servletResponse);
        }
        //...
    }
}

---

您可以像这样简化上面的代码：

---

You can simplify the code above like this :

public class FirstFilter implements Filter {
    //...

    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        //...
        if(someReason)
            servletRequest.setAttribute("executeSecondFilter", false);
        filterChain.doFilter(servletRequest, servletResponse);
    }
}

public class SecondFilter implements Filter {
    //..

    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        if (servletRequest.getAttribute("executeSecondFilter") != null) {
            filterChain.doFilter(servletRequest, servletResponse);
        }
        //...
    }
}

这样您只需检查属性executeSecondFilter

This way you just check the presence of the attribute "executeSecondFilter"

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