如何正确处理JSP / Servlet应用程序中的异常？ [英] How to Properly Handle Exceptions in a JSP/Servlet App?

问题描述

如何正确处理servlet中遇到的错误？现在，我继承的应用程序（仅使用普通的JSP / Servlet）有一个名为 Controller 的超类，它扩展了 HttpServlet 以及所有其他servlet的扩展。在那个控制器类是一个try和catch块，如下所示：

How do you properly handle errors encountered in a servlet? Right now, the app that I inherited (uses only plain JSP/Servlet) has a superclass called Controller which extends HttpServlet and which all other servlets extend from. In that Controller class is a try and catch block like the following:

try {
    // execute doPost or doGet here
} catch (Exception e) {
    // show a generic error page
}

这是正确的做法吗？它似乎很笨重，似乎并不总是奏效。我只是一名实习生，所以我没有很多经验。任何建议？我正在努力让应用程序变得健壮..

Is this the proper way of doing it? It seems clunky and doesn't seem to always work. I'm only an intern so I don't have a lot of experience with this. Any advice? I'm trying to make the app for robust..

推荐答案

要做的标准是让你的Servlet doXxx（）方法（例如 doGet（）， doPost（），抛出 ServletException 并允许容器捕获并处理它。您可以使用< error-page> WEB-INF / web.xml 中显示的自定义错误页面c>标签：

The standard thing to do is have your Servlet's doXxx() method (eg. doGet(), doPost(), etc.) throw a ServletException and allow the container to catch and handle it. You can specify a custom error page to be shown in WEB-INF/web.xml using the <error-page> tag:

<error-page>
    <error-code>500</error-code>
    <location>/error.jsp</location>
</error-page>

如果您最终捕获异常您无法优雅地处理，只需将其包装在 ServletException 中，如下所示：

If you end up catching an Exception you can't elegantly handle, just wrap it in a ServletException like this:

try {
    // code that throws an Exception
} catch (Exception e) {
    throw new ServletException(e);
}

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