IO学习

读取目录下的文件

package io;

import java.io.File;

public class FileTest {

    public void getFiles(String path) {
        File fileDir = new File(path);
        if (!fileDir.exists()) {
            return;
        }
        findFile(fileDir);

    }

    public void findFile(File fileDir) {
        File[] files = fileDir.listFiles();
        if (files == null) {
            return;
        }
        for (int i = 0; i < files.length; i++) {
            File file = files[i];
            if (file.isFile()&&file.getName().endsWith(".txt")) {
                System.out.println(file.getName());
            } else {
                findFile(file);
            }
        }
    }
    
    public static void main(String args[]){
        FileTest ft = new FileTest();
        ft.getFiles("E:/study");
    }
}

解压缩文件

package io;

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.util.Enumeration;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;

public class ZipFileTest {

    public void extractZip(String inPath, String outPath) {
        InputStream is = null;
        OutputStream os = null;
        try {
            ZipFile inFile = new ZipFile(inPath);
            Enumeration fileHeaders = inFile.entries();
            for (; fileHeaders.hasMoreElements();) {
                ZipEntry zip = (ZipEntry) fileHeaders.nextElement();
                String filename = zip.getName();
                String outFilePath = outPath + System.getProperty("file.separator") + filename;
                File file = new File(outFilePath);
                if (zip.isDirectory()) {
                    file.mkdirs();
                    continue;
                }
                File parentFile = file.getParentFile();
                if (!parentFile.exists()) {
                    parentFile.mkdirs();
                }
                is = inFile.getInputStream(zip);
                os = new FileOutputStream(outFilePath);
                int len = -1;
                byte[] buff = new byte[4096];
                while ((len = is.read(buff)) != -1) {
                    os.write(buff, 0, len);
                }
            }
        } catch (IOException ex) {
            Logger.getLogger(ZipFileTest.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            try {
                if (os != null) {
                    os.flush();
                    os.close();
                    os = null;
                }
                if (is != null) {
                    is.close();
                    is = null;
                }
            } catch (IOException ex) {
                Logger.getLogger(ZipFileTest.class.getName()).log(Level.SEVERE, null, ex);
            }
        }
    }

    public void compressZip(String inPath, String outPath) {
        ZipOutputStream zipOutput = null;
        try {
            zipOutput = new ZipOutputStream(new FileOutputStream(outPath));
            File file = new File(inPath);
            if (!file.exists()) {
                return;
            }
            if (file.isDirectory()) {
                findFile(file, zipOutput, "");
            } else {
                zipOutput.putNextEntry(new ZipEntry(file.getName()));
                if (file.isFile()) {
                    InputStream is = new FileInputStream(file);
                    int len = -1;
                    byte[] buff = new byte[4069];
                    while ((len = is.read(buff)) != -1) {
                        zipOutput.write(buff, 0, len);
                    }
                }
            }
        } catch (IOException ex) {
            Logger.getLogger(ZipFileTest.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            try {
                zipOutput.close();
            } catch (IOException ex) {
                Logger.getLogger(ZipFileTest.class.getName()).log(Level.SEVERE, null, ex);
            }
        }

    }

    public void findFile(File fileDir, ZipOutputStream zipOutput, String parentPath) {
        File[] files = fileDir.listFiles();
        if (files == null) {
            return;
        }

        for (int i = 0; i < files.length; i++) {
            File file = files[i];
            if (file.isFile()) {
                InputStream is = null;
                try {
                    zipOutput.putNextEntry(new ZipEntry(parentPath + File.separator + file.getName()));
                    is = new FileInputStream(file);
                    int len = -1;
                    byte[] buff = new byte[4069];
                    while ((len = is.read(buff)) != -1) {
                        zipOutput.write(buff, 0, len);
                    }
                } catch (IOException ex) {
                    Logger.getLogger(ZipFileTest.class.getName()).log(Level.SEVERE, null, ex);
                } finally {
                    try {
                        is.close();
                    } catch (IOException ex) {
                        Logger.getLogger(ZipFileTest.class.getName()).log(Level.SEVERE, null, ex);
                    }
                }
            } else {
                try {
                    if (parentPath.isEmpty()) {
                        parentPath = fileDir.getName();
                    } else {
                        parentPath += File.separator + file.getName();
                    }
                    zipOutput.putNextEntry(new ZipEntry(parentPath + "/"));
                    findFile(file, zipOutput, parentPath);
                    if( parentPath.lastIndexOf(File.separator)>0)
                    parentPath = parentPath.substring(0, parentPath.lastIndexOf(File.separator));
                } catch (IOException ex) {
                    Logger.getLogger(ZipFileTest.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
    }

    public static void main(String args[]) {
        ZipFileTest zip = new ZipFileTest();
        zip.compressZip("E:/study/j2se/io/root", "E:/study/j2se/io/extract/new.zip");
        zip.extractZip("E:/study/j2se/io/extract/new.zip", "E:/study/j2se/io/extract/New folder");
    }
}

感觉自己写的好复杂，这里需要注意的是 zipOutput.putNextEntry(new ZipEntry(parentPath + "/"));我在这里没有用File.separator,因为用这个，虽然能压缩成功，但是你解压的时候会把文件夹作为文件去处理，会导致错误，开始弄了半天没明白。

读取共享文件夹

package io;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.logging.Level;
import java.util.logging.Logger;
import jcifs.smb.SmbFile;
import jcifs.smb.SmbFileInputStream;

public class ReaderShareFile {

    public void read() {
        {
            BufferedReader reader = null;
            try {
                SmbFile smbFile = new SmbFile("smb://username:[email protected]/Users/Administrator/Desktop/jack/test.txt");
                if (smbFile.exists()) {
                    InputStream input = new SmbFileInputStream(smbFile);
                    reader = new BufferedReader(new InputStreamReader(input));
                    String str;
                    while ((str = reader.readLine()) != null) {
                        System.out.println(str);
                    }
                }
            } catch (IOException ex) {
                Logger.getLogger(ReaderShareFile.class.getName()).log(Level.SEVERE, null, ex);
            } finally {
                try {
                    reader.close();
                } catch (IOException ex) {
                    Logger.getLogger(ReaderShareFile.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
    }

    public static void main(String args[]) {
        ReaderShareFile test = new ReaderShareFile();
        test.read();
    }
}

要下载jcifs包