处理文件的方法

参考地址
http://javaalmanac.com/egs/java.io/pkg.html#Files

// Copies all files under srcDir to dstDir.
// If dstDir does not exist, it will be created.
public void copyDirectory(File srcDir, File dstDir) throws IOException {
if (srcDir.isDirectory()) {
            if (!dstDir.exists()) {
                dstDir.mkdir();
            }
   
            String[] children = srcDir.list();
            for (int i=0; i<children.length; i++) {
                copyDirectory(new File(srcDir, children[i]),
                                     new File(dstDir, children[i]));
            }
        } else {
            // This method is implemented in e1071 Copying a File
            copyFile(srcDir, dstDir);
        }
    }
//==========================================================================
    // Copies src file to dst file.
    // If the dst file does not exist, it is created
    void copy(File src, File dst) throws IOException {
        InputStream in = new FileInputStream(src);
        OutputStream out = new FileOutputStream(dst);
   
        // Transfer bytes from in to out
        byte[] buf = new byte[1024];
        int len;
        while ((len = in.read(buf)) > 0) {
            out.write(buf, 0, len);
        }
        in.close();
        out.close();
    }
////================================================
    try {
        // Create temp file.
        File temp = File.createTempFile("pattern", ".suffix");
   
        // Delete temp file when program exits.
        temp.deleteOnExit();
   
        // Write to temp file
        BufferedWriter out = new BufferedWriter(new FileWriter(temp));
        out.write("aString");
        out.close();
    } catch (IOException e) {
    }