[java]文件操作

来源：互联网发布：top域名备案编辑：程序博客网时间：2024/04/30 11:23
/* * To change this template, choose Tools | Templates * and open the template in the editor. */import java.io.BufferedOutputStream;import java.io.ByteArrayOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.io.PrintStream;/** * * @author 海兰 */public class FileUtil {public static String[] getUtfLines(String path) throws IOException {byte[] filebyte=readFile(path);String filestr=new String(filebyte,"UTF-8");String[] rev=filestr.split("\n");return rev;}public static String[] getLines(String path) throws IOException {byte[] filebyte=readFile(path);String filestr=new String(filebyte,"GBK");String[] rev=filestr.split("\n");return rev;}/**     * 读文件     *     * @param path     *        文件名     * @return 文件内容     * @throws IOException     */    public static byte[] readFile(String path) throws IOException    {        return readFile(path, 0);    }    /**     * 读文件     *     * @param path     *        文件名     * @param offset     *        偏移位置     * @return 从偏移位置开始读取的文件内容     * @throws IOException     */    public static byte[] readFile(String path, long offset)            throws IOException    {        return readFile(path, offset, -1);    }/**     * 读文件     *     * @param path     *        文件名     * @param offset     *        偏移位置     * @param size     *        读取大小     * @return 从偏移位置开始读取size大小的文件内容     * @throws IOException     */    public static byte[] readFile(String path, long offset, int size)            throws IOException    {       InputStream is = null;        try        {            ByteArrayOutputStream baos = new ByteArrayOutputStream();            is = new FileInputStream(path);            is.skip(offset);            byte[] buff = new byte[4096];            int bufLength = -1;            while ((bufLength = is.read(buff)) >= 0)            {                if (size > 0 && bufLength > size - baos.size())                {                    baos.write(buff, 0, size - baos.size());                    break;                } else                {                    baos.write(buff, 0, bufLength);                }            }            return baos.toByteArray();        } finally        {            if (is != null)            {                is.close();            }        }    }    /**     * 写文件     *     * @param path     *        文件名     * @param content     *        文件内容     * @return 服务端保存文件的实际绝对路径     * @throws IOException     */    public static String writeFile(String path, String content)            throws IOException    {        byte[] matter=content.getBytes("GBK");    return writeFile(path, matter, false);    }    /**     * 写文件     *     * @param path     *        文件名     * @param content     *        文件内容     * @param append     *        追加方式     * @return 服务端保存文件的实际绝对路径     * @throws IOException     */    public static String writeFile(String path, String content,boolean append)throws IOException    {    byte[] matter=content.getBytes("GBK");    return writeFile(path, matter, append);    }    public static String writeToFile(String savePath, String content)    {    File f = new File(savePath);    if (f.exists())    f.delete();    try    {    PrintStream ps = new PrintStream(savePath);    String tmp[] = content.split("\n");    for (int i = 0; i < tmp.length; i++)    ps.println(tmp[i]);    }    catch (Exception e)    {    e.printStackTrace();    }        return "";    }    /**     * 写文件     *     * @param path     *        文件名     * @param content     *        文件内容     * @return 服务端保存文件的实际绝对路径     * @throws IOException     */    public static String writeFile(String path, byte[] content)            throws IOException    {        return writeFile(path, content, false);    }    /**     * 写文件     *     * @param path     *        文件名     * @param content     *        文件内容     * @param append     *        追加方式     * @return 服务端保存文件的实际绝对路径     * @throws IOException     */    public static String writeFile(String path, byte[] content,            boolean append) throws IOException    {        if (path == null || path.length() == 0)        {            path = File.createTempFile("writeServerFile", ".file")                    .getAbsolutePath();        } else        {            path = new File(path).getAbsolutePath();        }        OutputStream os = null;        try        {            os = new BufferedOutputStream(new FileOutputStream(path, append));            os.write(content);            os.flush();        } finally        {            if (os != null)            {                os.close();            }        }        return path;    }    /**   * 获得该路径下的所有文件名的列表   * @param Url   * @return   */public static String[] getFileUrl(String Url){   File path = new File(Url);   String[] list;   list=path.list();   return list;}}
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