java.io.File中renameTo()。。。

gdj980150 2004-11-24 09:09:03

我使用这个方法怎么不能修改文件名呀？？？

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gdj980150 2004-12-01

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我自己解决了，怎么结帖？？？？

gdj980150 2004-11-24

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谁能给翻译一下，谢谢

williamy 2004-11-24

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renameTo
public boolean renameTo(File dest)Renames the file denoted by this abstract pathname.
Whether or not this method can move a file from one filesystem to another is platform-dependent. The return value should always be checked to make sure that the rename operation was successful.

Parameters:
dest - The new abstract pathname for the named file
Returns:
true if and only if the renaming succeeded; false otherwise
Throws:
SecurityException - If a security manager exists and its SecurityManager.checkWrite(java.lang.String) method denies write access to either the old or new pathnames
NullPointerException - If parameter dest is null

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~williamy

android 串口驱动源代码 package android.serialport; import java.io.File; import java.io.FileDescriptor; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import android.util.Log; public class SerialPort { private static final String TAG = "SerialPort"; /* * Do not remove or rename the field mFd: it is used by native method close(); */ private FileDescriptor mFd; private FileInputStream mFileInputStream; private FileOutputStream mFileOutputStream; public SerialPort(File device, int baudrate) throws SecurityException, IOException { /* Check access permission */ if (!device.canRead() || !device.canWrite()) { try { /* Missing read/write permission, trying to chmod the file */ Process su; su = Runtime.getRuntime().exec("/system/bin/su"); /*String cmd = "chmod 777 " + device.getAbsolutePath() + "\n" + "exit\n";*/ String cmd = "chmod 777 /dev/s3c_serial0" + "\n" + "exit\n"; su.getOutputStream().write(cmd.getBytes()); if ((su.waitFor() != 0) || !device.canRead() || !device.canWrite()) { throw new SecurityException(); } } catch (Exception e) { e.printStackTrace(); throw new SecurityException(); } } mFd = open(device.getAbsolutePath(), baudrate); if (mFd == null) { Log.e(TAG, "native open returns null"); throw new IOException(); } mFileInputStream = new FileInputStream(mFd); mFileOutputStream = new FileOutputStream(mFd); } // Getters and setters public InputStream getInputStream() { return mFileInputStream; } public OutputStream getOutputStream() { return mFileOutputStream; } // JNI private native static FileDescriptor open(String path, int baudrate); public native void close(); static { System.loadLibrary("serial_port"); } }

问题背景： 1、解压zip文件获取子文件 2、用java.io.File.renameTo对子文件进行改名 3、目录下目标文件名已存在情况下，Windows改名失败，Linux改名成功并覆盖原文件 VER：Microsoft Windows [版本 10.0.18362.1016] cat /proc/version：Linux version 4.4.184-1.el7.elrepo.x86_64 原因：java.io.File.renameTo最终调用了系统本地方法 private na

File类的一个对象，代表一个文件或一个文件目录File类声明在java.io包下File类中涉及到关于文件或文件目录的创建、删除、重命名、修改时间、文件大小的方，并未涉及到写入或读取文件内容的操作。如果需要读取或写入文件内容，必须使用IO流来完成。后续File类的对象常会作为参数传递到流的构造器中，指明读取或写入的"终点"。相对路径：在main方法里的相对路径是相对于当前工程javasenior...

Error: java.io.IOException: Cannot rename original file to C:\Program Files\Apache Software Foundation\Tomcat 6.0\conf\tomcat-users.xml.old Action：对于 windows 7系统，找到%TOMCAT_HOME&\conf，把 conf ...

java.io.IOException: failed to rename

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