标签: java-io

例如,我想压缩存储在/Users/me/Desktop/image.jpg中的文件

我做了这个方法:

public static Boolean generateZipFile(ArrayList<String> sourcesFilenames, String destinationDir, String zipFilename){
  // Create a buffer for reading the files 
  byte[] buf = new byte[1024]; 

  try {
   // VER SI HAY QUE CREAR EL ROOT PATH
         boolean result = (new File(destinationDir)).mkdirs();

         String zipFullFilename = destinationDir + "/" + zipFilename ;

         System.out.println(result);

   // Create the ZIP file  
   ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipFullFilename)); 
   // Compress the files 
   for (String filename: sourcesFilenames) { 
    FileInputStream in = new FileInputStream(filename); 
    // Add ZIP entry to …

什么原因导致Tomcat出现这种错误？

SEVERE: Exception loading sessions from persistent storage
java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException:
   bean.ProjectAreaBean
 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1333)
 at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
 at java.util.ArrayList.readObject(ArrayList.java:593)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(
    DelegatingMethodAccessorImpl.java:25)

我有两个Java.io.File对象file1和file2.我想将内容从file1复制到file2.有没有标准的方法来做到这一点,我不必创建一个读取file1和写入file2的方法

使用Java在文件中间写入字节的最佳方法是什么？

我需要在我的应用程序中使用全局权限在myapp/files/subdir下创建文件.我这样做是因为我使用外部应用程序来打开一些文件

 FileOutputStream fos = openFileOutput(FILENAME, Context.MODE_WORLD_READABLE);

仅在files文件夹下创建文件.运用

    File dir=new File(Constants.TASK_DIRECTORY);
    dir.mkdirs();
    File file=new File(dir, FILENAME);         
    file.createNewFile(); FileOutputStream fos=new FileOutputStream(file);

在子目录下创建文件但具有私有权限.我需要找到一种方法来组合这两者,以便在子目录中创建一个世界可读的文件

我一直在尝试很多事情,但没有人帮助我,这是我未解决的最长时间问题

这可能是一个愚蠢的,但我想知道背景操作的差异.

1. InputStream is = new FileInputStream(filepath);
2. FileInputStream is = new FileInputStream(filepath);

上面两行代码之间的区别是什么,以及它们使用的场景.

有没有办法InputStream包装UTF-8列表String？我想做点什么:

InputStream in = new XyzInputStream( List<String> lines )

我正在使用Java 7 File API.我编写了一个在Ubuntu上完美地创建目录的类,但是当我在Windows上运行相同的代码时,它会抛出错误:

Exception in thread "main" java.lang.UnsupportedOperationException: 'posix:permissions' not supported as initial attribute
    at sun.nio.fs.WindowsSecurityDescriptor.fromAttribute(Unknown Source)
    at sun.nio.fs.WindowsFileSystemProvider.createDirectory(Unknown Source)
    at java.nio.file.Files.createDirectory(Unknown Source)
    at java.nio.file.Files.createAndCheckIsDirectory(Unknown Source)
    at java.nio.file.Files.createDirectories(Unknown Source)
    at com.cloudspoke.folder_permission.Folder.createFolder(Folder.java:27)
    at com.cloudspoke.folder_permission.Main.main(Main.java:139)

我的文件夹类代码是

package com.cloudspoke.folder_permission;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.attribute.FileAttribute;
import java.nio.file.attribute.PosixFilePermission;
import java.nio.file.attribute.UserPrincipal;
import java.util.Set;

public class Folder{
    // attributes required for creating a Folder
    private UserPrincipal owner;
    private Path folder_name;
    private FileAttribute<Set<PosixFilePermission>> attr;


    public Folder(UserPrincipal owner,Path folder_name,FileAttribute<Set<PosixFilePermission>> attr){
        this.owner=owner;
        this.folder_name=folder_name;
        this.attr=attr;
    }
    //invoking …

我有一个目录:

File dir = new File(MY_PATH);

我想列出名称为整数字符串的所有文件,例如"10","20".
我知道我应该使用:

dir.list(FilenameFilter filter);

如何定义我的FilenameFilter？

PS我的意思是文件名可以是任何整数字符串,例如"10"或"2000000"或"3452345".只要文件名是整数字符串,就没有数字限制.

尝试在Java中java.nio.file.DirectoryNotEmptyException递归删除从Delete目录中删除的递归删除方法中的偶然问题

代码(归功于@TrevorRobinson):

static void removeRecursive(Path path) throws IOException {
    Files.walkFileTree(path, new SimpleFileVisitor<Path>() {

        final Logger logger = LoggerFactory.getLogger(this.getClass());
        @Override
        public FileVisitResult visitFile(Path file,
                BasicFileAttributes attrs) throws IOException {
            logger.warn("Deleting " + file.getFileName());
            Files.delete(file);
            logger.warn("DELETED " + file.getFileName());
            return FileVisitResult.CONTINUE;
        }

        @Override
        public FileVisitResult visitFileFailed(Path file, IOException exc) {
            // try to delete the file anyway, even if its attributes could
            // not be read, since delete-only access is theoretically possible
            // I NEVER SEE …