【JAVA】压缩文件以及解压缩

下面是JAVA中将文件/文件夹压缩成zip以及解压缩的代码：

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;

public class FileZip {
    public static void zip(String src, String dest) throws IOException {
        //提供了一个数据项压缩成一个ZIP归档输出流
        ZipOutputStream out = null;
        try {
            File outFile = new File(dest);//源文件或者目录
            File fileOrDirectory = new File(src);//压缩文件路径
            out = new ZipOutputStream(new FileOutputStream(outFile));
            
            //如果此文件是一个文件，否则为false。
            if (fileOrDirectory.isFile()) {
                zipFileOrDirectory(out, fileOrDirectory, "");
            } else {
                //返回一个文件或空阵列。
                File[] entries = fileOrDirectory.listFiles();
                    for (int i = 0; i < entries.length; i++) {
                        // 递归压缩，更新curPaths
                        zipFileOrDirectory(out, entries[i], "");
                    }
            }
        } catch (IOException ex) {
            ex.printStackTrace();
        } finally {
            //关闭输出流
            if (out != null) {
                try {
                    out.close();
                } catch (IOException ex) {
                    ex.printStackTrace();
                }
            }
        }
    }
 
 private static void zipFileOrDirectory(ZipOutputStream out,
   File fileOrDirectory, String curPath) throws IOException {
     //从文件中读取字节的输入流
     FileInputStream in = null;
     try {
         //如果此文件是一个目录，否则返回false。
         if (!fileOrDirectory.isDirectory()) {
             // 压缩文件
             byte[] buffer = new byte[4096];
             int bytes_read;
             in = new FileInputStream(fileOrDirectory);
             //实例代表一个条目内的ZIP归档
             ZipEntry entry = new ZipEntry(curPath + fileOrDirectory.getName());
             //条目的信息写入底层流
             out.putNextEntry(entry);
             while ((bytes_read = in.read(buffer)) != -1) {
                 out.write(buffer, 0, bytes_read);
             }
             out.closeEntry();
         } else {
             // 压缩目录
             File[] entries = fileOrDirectory.listFiles();
             for (int i = 0; i < entries.length; i++) {
                 // 递归压缩，更新curPaths
                 zipFileOrDirectory(out, entries[i], curPath + fileOrDirectory.getName() + "/");
             }
         }
     } catch (IOException ex) {
         ex.printStackTrace();
         // throw ex;
     } finally {
         if (in != null) {
             try {
                 in.close();
             } catch (IOException ex) {
                 ex.printStackTrace();
             }
         }
     }
 }
 
 @SuppressWarnings("unchecked")
 public static void unzip(String zipFileName, String outputDirectory) throws IOException {
     ZipFile zipFile = null;
     try {
         zipFile = new ZipFile(zipFileName);
         Enumeration e = zipFile.entries();
         ZipEntry zipEntry = null;
         File dest = new File(outputDirectory);
         dest.mkdirs();
         while (e.hasMoreElements()) {
             zipEntry = (ZipEntry) e.nextElement();
             String entryName = zipEntry.getName();
             InputStream in = null;
             FileOutputStream out = null;
             try {
                 if (zipEntry.isDirectory()) {
                     String name = zipEntry.getName();
                     name = name.substring(0, name.length() - 1);
                     File f = new File(outputDirectory + File.separator + name);
                     f.mkdirs();
                 } else {
                     int index = entryName.lastIndexOf("\\");
                     if (index != -1) {
                         File df = new File(outputDirectory + File.separator
                                 + entryName.substring(0, index));
                         df.mkdirs();
                     }
                     index = entryName.lastIndexOf("/");
                     if (index != -1) {
                         File df = new File(outputDirectory + File.separator
                                 + entryName.substring(0, index));
                         df.mkdirs();
                     }
                     File f = new File(outputDirectory + File.separator
                             + zipEntry.getName());
                     // f.createNewFile();
                     in = zipFile.getInputStream(zipEntry);
                     out = new FileOutputStream(f);
                     int c;
                     byte[] by = new byte[1024];
                     while ((c = in.read(by)) != -1) {
                         out.write(by, 0, c);
                     }
                     out.flush();
                 }
             } catch (IOException ex) {
                 ex.printStackTrace();
                 throw new IOException("解压失败：" + ex.toString());
             } finally {
                 if (in != null) {
                     try {
                         in.close();
                     } catch (IOException ex) {
                     }
                 }
                 if (out != null) {
                     try {
                         out.close();
                     } catch (IOException ex) {
                     }
                 }
             }
         }
     } catch (IOException ex) {
         ex.printStackTrace();
         throw new IOException("解压失败：" + ex.toString());
     } finally {
         if (zipFile != null) {
             try {
                 zipFile.close();
             } catch (IOException ex) {
             }
         }
     }
 }
}

测试下来比MAC上面的压缩软件效果还要好一点，压得更小。代码非常清楚，两个函数，直接调用即可，下面是实例：

import java.io.IOException;

public class Test {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        FileZip zip = new FileZip();
        try {
            zip.zip("/Users/mac/Desktop/test", "/Users/mac/Desktop/test1.zip");
            zip.unzip("/Users/mac/Desktop/test1.zip", "/Users/mac/Desktop/testun");
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

会生成test1.zip压缩包和testun解压缩软件。十分方便！

（zz:http://blog.sina.com.cn/s/blog_600ff0750100x61j.html)(例子是自己的)