Java 如何授予Tomcat 9对其他文件的访问权限

Tomcat 9是沙盒

我想读取日志文件的数据。

文件位于/opt/zigbee2mqtt/data/“

我已经读过这篇文章并试过了。

我编辑了文件，并重新加载了

systemctl守护进程

，以及

systemctl重新启动tomcat9

然后，我编写了java类，其中应该读取日志文件中的数据。但我有个例外

java.io.FileNotFoundException: /opt/zigbee2mqtt/data/configuration.yaml (Permission denied)
        at java.base/java.io.FileOutputStream.open0(Native Method)
        at java.base/java.io.FileOutputStream.open(FileOutputStream.java:298)
        at java.base/java.io.FileOutputStream.<init>(FileOutputStream.java:237)
        at java.base/java.io.FileOutputStream.<init>(FileOutputStream.java:187)
        at com.fasterxml.jackson.dataformat.yaml.YAMLFactory.createGenerator(YAMLFactory.java:437)
        at com.fasterxml.jackson.databind.ObjectMapper.createGenerator(ObjectMapper.java:1156)
        at com.fasterxml.jackson.databind.ObjectMapper.writeValue(ObjectMapper.java:3570)
        at zigbee.main.doupdateconfiguration(main.java:81)
        at Servlet.configuration.doPost(configuration.java:72)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:660)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.catalina.filters.ExpiresFilter.doFilter(ExpiresFilter.java:1226)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:200)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
        at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:668)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
        at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
        at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
        at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:834)
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1415)
        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.base/java.lang.Thread.run(Thread.java:834)

Tomcat 9可以读取文件，Zigbee也可以更新文件，那么最好的解决方案是什么

更新：

root@raspberrypi:/opt/zigbee2mqtt/data# ll
total 24K
-rw-rw-r--  1 pi webservice  360 May 13 22:03 state.json
drwxrw-r-x  6 pi webservice 4.0K May 12 09:17 log
drwxr-xr-x  3 pi pi         4.0K May 10 18:31 .
-rw-rw-r--  1 pi webservice 4.0K May 10 18:31 database.db
-rw-rw-r--  1 pi webservice  330 May 10 17:23 configuration.yaml
drwxr--r-- 12 pi pi         4.0K May 10 11:16 ..
root@raspberrypi:/opt/zigbee2mqtt/data# id tomcat
uid=1001(tomcat) gid=1001(tomcat) groups=1001(tomcat),1002(webservice)

附加内容：

/etc/systemd/system/tomcat9.service.d/override.conf

[Service]
ReadWritePaths=/usr/local/jakarta-tomcat/webapps/smartzig/_x_logs/
ReadWritePaths=/opt/zigbee2mqtt/data/
ReadWritePaths=/opt/zigbee2mqtt/
ReadWritePaths=/opt/

---

将tomcat添加到一个组中，并授予该组对该文件所需的访问权限，例如，您可以创建一个名为

webserver

的组。然后重新启动tomcat并重试

---

步骤

$ sudo groupadd webserver

，通过添加权限来更新目录（包含文件）的组所有权

$ sudo chgrp webserver /opt/zigbee2mqtt/data/
$ sudo chgrp webserver /opt/zigbee2mqtt/ 

---

yaml文件的权限是“-rw-rw-r--”，从左到右读取

• 文件所有者可以读取和写入（不执行）
• 文件所有者的组可以读取和写入（不执行）
• 其他人都可以读取该文件

因此，如果可以写入文件，则这取决于运行tomcat进程的用户。但是每个人都应该能够阅读该文件。如果无法读取文件，则可能以读/写模式而不是读模式打开文件

---

您可以

chmod666

将权限更改为“-rw rw-rw-”

的文件评论不用于扩展讨论；这段对话已经结束。

$ sudo usermod -a -G webserver tomcat9

$ sudo chgrp webserver configuration.yaml

$ sudo chmod g=rw configuration.yaml

$ sudo systemctl restart tomcat9

$ sudo chgrp webserver /opt/zigbee2mqtt/data/
$ sudo chgrp webserver /opt/zigbee2mqtt/ 

$ sudo chmod g=rwx /opt/zigbee2mqtt/data/
$ sudo chmod g=rwx /opt/zigbee2mqtt/