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我的 servlet 托管在免费试用 apache 服务器中，用于测试目的。因此，当我尝试将 jpeg 图像上传到该服务器中的图像文件夹时，它会出现此错误：

java.security.AccessControlException: access denied ("java.io.FilePermission" "/usr/local/shared/tomcat/dilis/temp/upload_e1bed5d1_54a9_45e0_b1ae_26732a1441fc_00000059.tmp" "write")
java.security.AccessControlContext.checkPermission(AccessControlContext.java:366)
java.security.AccessController.checkPermission(AccessController.java:555)
java.lang.SecurityManager.checkPermission(SecurityManager.java:549)
java.lang.SecurityManager.checkWrite(SecurityManager.java:979)
java.io.FileOutputStream.<init>(FileOutputStream.java:203)
java.io.FileOutputStream.<init>(FileOutputStream.java:165)
org.apache.commons.io.output.DeferredFileOutputStream.thresholdReached(DeferredFileOutputStream.java:178)
org.apache.commons.io.output.ThresholdingOutputStream.checkThreshold(ThresholdingOutputStream.java:224)
org.apache.commons.io.output.ThresholdingOutputStream.write(ThresholdingOutputStream.java:128)
org.apache.commons.fileupload.util.Streams.copy(Streams.java:108)
org.apache.commons.fileupload.util.Streams.copy(Streams.java:70)
org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:347)
org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:115)
sanin.lands.web.Mobile_slt.doPost(Mobile_slt.java:137)
javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
sun.reflect.GeneratedMethodAccessor32.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:601)
org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:244)
java.security.AccessController.doPrivileged(Native Method)
javax.security.auth.Subject.doAsPrivileged(Subject.java:536)
org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:276)
org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:162)

我应该如何将临时目录更改为我可以访问的位置或任何其他方式？

这是我的 servlet 代码：

if (!((FilenameUtils.getName(item.getName()) == "") ||
 (FilenameUtils.getName(item.getName()).isEmpty()))) {
    String rootPath = System.getProperty("catalina.home");
    File theDir = new File(rootPath + "\\webapps\\images\\" + max_id);
      // if the directory does not exist, create it
    if (!theDir.exists()) {
        boolean result = theDir.mkdir();
        if (result) {
            System.out.println("DIR created");
        }
    }
    String fieldname = item.getFieldName(); 
    InputStream filecontent = item.getInputStream();
    File f = new File(rootPath + "\\webapps\\images\\" + max_id + "\\" + item.getName());
    try {
        //  item.write(file);
        item.write(f);
    } catch (Exception ex) {
        Logger.getLogger(Mobile_slt.class.getName()).log(Level.SEVERE, null, ex);
    }
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