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Java EE HTTP 状态 500 - 权限被拒绝

转载 作者：行者123 更新时间：2023-11-30 06:02:50 25 4
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在浏览器中运行本地项目时，我收到 Java EE HTTP 状态 500 - 权限被拒绝。但是当通过 main 方法在 Netbeans 中运行时，它可以使用相同的代码正确地从文件中读取和写入。

我尝试在 SO 上查找答案，但没有找到足够具体的解决方案。

我的index.jsp:

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <form action="Servlet" method="post">
            <input type="text" name="userInput">
            <input type="submit" name="Servlet">           
        </form>        
    </body>
</html>

Servlet.java:

@WebServlet("/Servlet")
public class Servlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setAttribute("lol", "lol");
        req.getRequestDispatcher("index.jsp").forward(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        if (req.getParameter("userInput") != null) {
            System.out.println("gotcha");
            IO io = new IO(req.getParameter("userInput"));
            //req.setAttribute("input", io.readFile());
            //System.out.println(io.readFile());
        }
        req.getRequestDispatcher("tab.jsp").forward(req, resp);
    }

}

IO.java:

public class IO {

    final String FILENAME = "file.txt";

    public static void main(String[] args) throws IOException {
        FileWriter fw = new FileWriter("file.txt", true);
        PrintWriter pw = new PrintWriter(fw);
        pw.println("test");
        pw.flush();
    }

    public IO() throws FileNotFoundException {
    }

    public IO(String text) throws IOException {
        FileWriter fw = new FileWriter(FILENAME, true);
        PrintWriter pw = new PrintWriter(fw);
        pw.println(text + ",");
        pw.flush();
    }

    public String readFile() throws IOException {
        StringBuilder sb = new StringBuilder();
        FileReader fr = new FileReader(FILENAME);
        int data = fr.read();
        while (data != -1) {
            sb.append(fr.read());
            data = fr.read();
        }
        return sb.toString();
    }
}

它在构造函数中的以下行发生冲突

FileWriter fw = new FileWriter(FILENAME, true);

完整的堆栈跟踪

19-Aug-2018 20:10:29.265 SEVERE [http-nio-8084-exec-315] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [PresentationLayer.Servlet] in context with path [/web] threw exception
 java.io.FileNotFoundException: file.txt (Permission denied)
    at java.io.FileOutputStream.open0(Native Method)
    at java.io.FileOutputStream.open(FileOutputStream.java:270)
    at java.io.FileOutputStream.<init>(FileOutputStream.java:213)
    at java.io.FileOutputStream.<init>(FileOutputStream.java:133)
    at java.io.FileWriter.<init>(FileWriter.java:78)
    at BusinessLayer.IO.<init>(IO.java:24)
    at PresentationLayer.Servlet.doPost(Servlet.java:24)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:217)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:673)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:748)

最佳答案

如果您在 java ee 应用程序服务器上运行某些内容，则当前工作目录通常是该服务器的 /bin 文件夹。

使用相对文件位置搜索相对于当前工作目录的文件。

显示当前工作目录的一种方法是 System.out.println( new File(".").getCanonicalPath());

选项:

关于Java EE HTTP 状态 500 - 权限被拒绝，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/51920552/

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