Java EE HTTP 狀態 500 - 權限被拒絕
[英]Java EE HTTP Status 500 - Permission Denied
問題描述
在瀏覽器中運行我的本地項目時，我收到 Java EE HTTP Status 500 - Permission Denied。 但是在 Netbeans 中通過 main 方法運行它時，它可以使用相同的代碼從文件中正確讀取和寫入。
我試圖在 SO 上查找答案，但我還沒有找到足夠具體的解決方案。
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();
}
}
它在以下行的構造函數中崩潰
FileWriter fw = new FileWriter(FILENAME, true);
完整的堆棧跟蹤
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)
1 個解決方案
解決方案1
1 已采納 2018-08-19 18:26:17
如果您在 java ee 應用程序服務器上運行某些程序，則當前工作目錄通常是該服務器的/bin文件夾。
使用相對文件位置搜索相對於當前工作目錄的文件。
顯示當前工作目錄的一種方法是System.out.println( new File(".").getCanonicalPath());
選項：
- 使用絕對文件位置
- 將文件放入當前工作目錄
- 從類路徑/戰爭加載文件
HTTP 狀態 500 - 權限被拒絕
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