【发布时间】：2018-08-19 18:16:35
【问题描述】：
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。但是当它在 Netbeans 中通过 main 方法运行时，它可以使用相同的代码正确地从文件中读取和写入。
我试图在 SO 上查找答案，但我还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();
}
}
它在以下行的构造函数中崩溃
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)
【问题讨论】：
标签： java permissions