我有一个问题,即使用servlet删除和重命名目录中的多个文件。运行下面的代码时,有时某些文件正在删除其他一些文件。以下是我使用的servlet代码。
public class SendRedirect extends HttpServlet {
RootSipResourceApp app =new RootSipResourceApp();
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html; charset=UTF-8"); if (strSaveFile != null)
app.updateRootFile(strDirectorypath, strappID, appNames);
RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/index.jsp");
dispatcher.forward(request, response);
}
}
RootSipResource.java文件
public void updateRootFile(String directorypath, String appID, String[] appName) throws IOException {
FileInputStream fins=null;
try {
File[] listOfFiles = fileLists(directorypath);
for (int i = 0; i < listOfFiles.length; i++) {
synchronized(listOfFiles) {
if (listOfFiles[i].isFile()) {
rootFiles = listOfFiles[i].getName();
if (rootFiles.endsWith(".properties") || rootFiles.endsWith(".PROPERTIES")) {
fins = new FileInputStream(directorypath + rootFiles);
properties.load(new InputStreamReader(fins, Charset.forName("UTF-8")));
String getAppName = properties.getProperty("root.label." + appID);
String propertyStr = "root.label." + appID;
String toUtf =new String(appName[i].getBytes("iso-8859-1"), "UTF-8") ;
saveFile(fins, getAppName, directorypath + rootFiles, propertyStr,toUtf);
}
}
}
}
} catch (Exception e) {
System.out.println("Exception Inside updateRootFile():: " + e);
}
}
public void saveFile(FileInputStream fIns, String oldAppName, String filePath, String propertyStr, String appName)
throws IOException {
FileInputStream finStream =null;
try {
String oldChar = propertyStr + "=" + oldAppName;
String newChar = propertyStr + "=" + appName;
String strLine;
File rootFile = new File(filePath);
File copyFile = new File("D:\\root\\root_created.properties");
finStream = new FileInputStream(rootFile);
BufferedReader br = new BufferedReader(new InputStreamReader(finStream, "UTF-8"));
OutputStreamWriter outStream = new OutputStreamWriter(new FileOutputStream(copyFile), "UTF-8");
while ((strLine = br.readLine()) != null) {
strLine = strLine.replace(oldChar, newChar);
outStream.write(strLine);
outStream.write("\r\n");
}
outStream.flush();
outStream.close();
br.close();
fIns.close();
finStream.close();
rootFile.delete();
copyFile.renameTo(rootFile);
} catch (IOException e) {
System.out.println(" Excpetion in save file--*******************---" + e);
}
}
我在updateRootFile()方法中使用了synchorinized关键字。但仍然无法正常工作..
答案 0 :(得分:0)
在同时发出许多请求的环境中运行时,此代码是否运行错误,或者在单个线程中运行此方法时甚至不起作用?试图调试它?
在任何情况下,你的'synchronized'构造在这里都是无关紧要的,因为你的'listOfFiles'是一个在方法内而不是字段内局部定义的变量。如果不是servlet的特定部分,而是不正确地使用同步机制。