(Java) File工具类

 

package com.newpay.common;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

import com.rpcservice.common.CheckUtil;
import com.rpcservice.common.Log;
import org.apache.commons.compress.archivers.zip.ZipArchiveEntry;


public class FileUtil {
    private static SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMdd");

    public static void main(String[] args) {
        String oldPath = "F:\\git\\project\\newpay_java\\newPay\\src\\Main.java";
        String newPath = "F:\\Main.java";
        fileCopy(oldPath, newPath);
    }


    /**
     * 从网络Url中下载文件
     * @param urlStr
     * @param fileName
     * @param savePath
     * @throws IOException
     */
    public static void  downLoadFromUrl(String urlStr,String fileName,String savePath) throws IOException{
        URL url = new URL(urlStr);
        HttpURLConnection conn = (HttpURLConnection)url.openConnection();
        //设置超时间为3秒
        conn.setConnectTimeout(3*1000);
        //防止屏蔽程序抓取而返回403错误
        conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");

        //得到输入流
        InputStream inputStream = conn.getInputStream();
        //获取自己数组
        byte[] getData = readInputStream(inputStream);

        //文件保存位置
        File saveDir = new File(savePath);
        if(!saveDir.exists()){
            saveDir.mkdir();
        }
        File file = new File(saveDir+File.separator+fileName);
        FileOutputStream fos = new FileOutputStream(file);
        fos.write(getData);
        if(fos!=null){
            fos.close();
        }
        if(inputStream!=null){
            inputStream.close();
        }
        System.out.println("info:"+url+" download success");
    }

    /**
     * 从输入流中获取字节数组
     * @param inputStream
     * @return
     * @throws IOException
     */
    public static  byte[] readInputStream(InputStream inputStream) throws IOException {
        byte[] buffer = new byte[1024];
        int len = 0;
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        while((len = inputStream.read(buffer)) != -1) {
            bos.write(buffer, 0, len);
        }
        bos.close();
        return bos.toByteArray();
    }


    public static boolean fileCopy(String oldPath, String newPath) {
        InputStream in = null;
        FileOutputStream  os = null;
        try {
            in = new FileInputStream(oldPath);
            os = new FileOutputStream(newPath);
            int len;
            byte[] buf = new byte[1024];
            while((len=in.read(buf))!= -1) {//包含该行内容的字符串，不包含任何行终止符，如果已到达流末尾，则返回 null
                os.write(buf, 0, len);
            }
        } catch (Exception e) {

        } finally {
            if (null != os) {
                try {
                    os.close();
                } catch (IOException e) {
                    e.printStackTrace();
                    return false;
                }
            }
            if (null != in) {
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                    return false;
                }
            }
        }
        return true;
    }

    /**
     * 写入文件
     *
     * @param str  写入内容
     * @param type 写入的文件在[log,image]文件夹下
     * @param path 写入文件的文件名，带后缀
     * @return
     */
    public static boolean writeFile(String str, String type, String path) {
        PrintStream ps = null;
        try {
            File file = new File(CheckUtil.getSafePath(type, path));
            ps = new PrintStream(new FileOutputStream(file));
            if (null != ps) {
                ps.print(str);
            }
            return true;
        } catch (FileNotFoundException e) {
            return false;
        } finally {
            if (null != ps) {
                ps.close();
            }
        }
    }
    /**
     * @param fileName
     * @param position
     * @param contents
     * @return
     * @throws Exception
     */
    public static boolean insertFile(String fileName, int position, String contents, String type) throws Exception {
        if(null == contents || 0 >= contents.length()){
            return false;
        }
        contents = new String(contents.getBytes("UTF-8"),"utf-8");
        StringBuilder sb = new StringBuilder(type);
        sb.append("\\").append(dateFormat.format(new Date())).append("\\").append(fileName);
        //1、参数校验
        File file = new File(sb.toString());
        System.out.println(file);
        //判断文件是否存在
        if (!(file.exists() && file.isFile())) {
            System.out.println("文件不存在  ~ ");
            file.createNewFile();
        }
        //判断position是否合法
        if ((position < 0) || (position > file.length())) {
            System.out.println("position不合法 ~ ");
            return false;
        }

        //2、创建临时文件
        File tempFile = File.createTempFile("sss", ".temp", new File("d:/"));
        //File tempFile = new File("d:/wwwww.txt");
        //3、用文件输入流、文件输出流对文件进行操作
        FileOutputStream outputStream = new FileOutputStream(tempFile);
        FileInputStream inputStream = new FileInputStream(tempFile);
        //在退出JVM退出时自动删除
        tempFile.deleteOnExit();

        //4、创建RandomAccessFile流
        RandomAccessFile rw = new RandomAccessFile(file, "rw");
        //文件指定位置到 position
        rw.seek(position);

        int tmp;
        //5、将position位置后的内容写入临时文件
        while ((tmp = rw.read()) != -1) {
            outputStream.write(tmp);
        }
        //6、将追加内容 contents 写入 position 位置
        rw.seek(position);
        rw.write(contents.getBytes());

        //7、将临时文件写回文件，并将创建的流关闭
        while ((tmp = inputStream.read()) != -1) {
            rw.write(tmp);
        }
        rw.close();
        outputStream.close();
        inputStream.close();
        return true;
    }

    /**
     * 追加写入文件
     *
     * @param str 写入内容
     * @return
     */
    public static boolean writeAddFile(String str, String fileName, String type) {
        try {
            str = new String(str.getBytes("UTF-8"),"utf-8");
        } catch (UnsupportedEncodingException e) {
            return false;
        }
        StringBuilder sb = new StringBuilder(type).append("\\").append(dateFormat.format(new Date()));
        FileWriter ps = null;
        try {
            File file = new File(sb.toString());
            if (!file.exists()) {
                file.mkdirs();
            }
            sb.append("\\").append(fileName);
            file = new File(sb.toString());
            if (!file.exists()) {
                file.createNewFile();
            }
            ps = new FileWriter(sb.toString(), true);
            //ps = new PrintStream(new FileOutputStream(file));
            if (null != ps) {
                ps.write(str);
            }
            return true;
        } catch (FileNotFoundException e) {
            return false;
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (null != ps) {
                try {
                    ps.close();
                } catch (IOException e) {
                    e.printStackTrace();
                    return false;
                }
            }
        }
        return false;
    }

    /**
     * 将图片文件获取成String
     *
     * @param type 读取的图片在[log,image]文件夹下
     * @param path 读取的图片的文件名，带后缀
     * @return
     */
    public static String getImgfromFile(String type, String path) {
        InputStream in = null;
        byte[] data = null;
        try {
            in = new FileInputStream(CheckUtil.getSafePath(type, path));
            if (null != in) {
                data = new byte[in.available()];
                in.read(data);
            }
            in.close();
        } catch (Exception e) {
            Log.error(e.toString());
        }
        return Base64.encode(data);
    }

    /**
     * 读文件
     *
     * @param type 读取的文件在[log,image]文件夹下
     * @param path 读取的文件的文件名，带后缀
     */
    public static String getFile(String type, String path) {
        String result = null;
        File file = new File(CheckUtil.getSafePath(type, path));
        Long fileLength = file.length();
        byte[] fileContent = new byte[fileLength.intValue()];
        try {
            FileInputStream in = new FileInputStream(file);
            in.read(fileContent);
            in.close();
            result = new String(fileContent, "UTF-8");
        } catch (Exception e) {
            System.out.println(e + "\n[读取文本文件内容错误]");
        }
        return result;
    }

    public static File doZip(String sourceDir, String zipFilePath) throws IOException {
        File file = new File(sourceDir);
        File zipFile = new File(zipFilePath);
        if(!zipFile.exists()){
            zipFile.mkdirs();
        }
        ZipOutputStream zos = null;
        try {

            String basePath = null;
            //获取目录
            if (file.isDirectory()) {
                basePath = file.getPath();
            } else {
                basePath = file.getParent();
            }
            zipFile(file, basePath, zos);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } finally {
            if (zos != null) {
                zos.closeEntry();
                zos.close();
            }
        }
        return zipFile;
    }

    private static void zipFile(File file, String basePath, ZipOutputStream zos) throws IOException {
        File[] files = null;
        if (file.isDirectory()) {
            files = file.listFiles();

        }else{
            files = new File[1];
            files[0] = file;
        }
        InputStream is = null;
        String pathName;
        byte[] buf = new byte[1024];
        int length = 0;
        try{
            for (File f:files){
                if(f.isDirectory()){
                    pathName = f.getPath().substring(basePath.length()+1)+"/";
                    zos.putNextEntry(new ZipEntry(pathName));
                    zipFile(f,basePath,zos);
                }else{
                    pathName = f.getPath().substring(basePath.length()+1)+"/";
                    File zipFile = new File(pathName);
                    OutputStream os = new FileOutputStream(zipFile);
                    BufferedOutputStream bos = new BufferedOutputStream(os);
                    zos = new ZipOutputStream(bos);

                    is = new FileInputStream(f);
                    BufferedInputStream bis = new BufferedInputStream(is);
                    ZipEntry zipEntry = new ZipArchiveEntry(pathName);
                    zos.putNextEntry(zipEntry);
                    while ((length = bis.read(buf))>0){
                        zos.write(buf,0,length);
                    }
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if(is != null){
                is.close();
            }
        }
    }
    
    /**
     *  读取文件 返回二进制内容
     * @param filePath
     * @return
     */
    public static byte[] readFile(String filePath){
        byte[] fileContent = null;
        FileInputStream is = null;
        try {
            is = new FileInputStream(filePath);
            fileContent = new byte[is.available()];
            int len = 0;
            while((len = is.read(fileContent)) != -1) {
                ;
            }
        } catch (IOException e) {
            Log.error(e.getMessage());
        } finally {
            if (null != is) {
                try {
                    is.close();
                } catch (IOException e) {
                    Log.error(e.getMessage());
                }
            }
        }
        return fileContent;
    }


    /**
     * 删除单个文件
     *
     * @param fileName
     *            要删除的文件的文件名
     * @return 单个文件删除成功返回true，否则返回false
     */
    public static boolean deleteFile(String fileName) {
        File file = new File(fileName);
        // 如果文件路径所对应的文件存在，并且是一个文件，则直接删除
        if (file.exists() && file.isFile()) {
            if (file.delete()) {
                System.out.println("删除单个文件" + fileName + "成功！");
                return true;
            } else {
                System.out.println("删除单个文件" + fileName + "失败！");
                return false;
            }
        } else {
            System.out.println("删除单个文件失败：" + fileName + "不存在！");
            return false;
        }
    }

    /**
     * 删除目录及目录下的文件
     * @param dir
     *            要删除的目录的文件路径
     * @return 目录删除成功返回true，否则返回false
     */
    public static boolean deleteDirectory(String dir) {
        // 如果dir不以文件分隔符结尾，自动添加文件分隔符
        if (!dir.endsWith(File.separator)) {
            dir = dir + File.separator;
        }
        File dirFile = new File(dir);
        // 如果dir对应的文件不存在，或者不是一个目录，则退出
        if ((!dirFile.exists()) || (!dirFile.isDirectory())) {
            System.out.println("删除目录失败：" + dir + "不存在！");
            return false;
        }
        boolean flag = true;
        // 删除文件夹中的所有文件包括子目录
        File[] files = dirFile.listFiles();
        for (int i = 0; i < files.length; i++) {
            // 删除子文件
            if (files[i].isFile()) {
                flag = FileUtil.deleteFile(files[i].getAbsolutePath());
                if (!flag) {
                    break;
                }

            }
            // 删除子目录
            else if (files[i].isDirectory()) {
                flag = FileUtil.deleteDirectory(files[i]
                        .getAbsolutePath());
                if (!flag) {
                    break;
                }

            }
        }
        if (!flag) {
            System.out.println("删除目录失败！");
            return false;
        }
        // 删除当前目录
        if (dirFile.delete()) {
            System.out.println("删除目录" + dir + "成功！");
            return true;
        } else {
            return false;
        }
    }

}