用java实现zip压缩

[转自] http://szhnet.iteye.com/blog/199059

本来是写到spaces live上的，可是代码的显示效果确实不怎么好看。在javaeye上试了试代码显示的顺眼多了。

今天写了个用java压缩的功能，可以实现对文件和目录的压缩。

由于java.util.zip.ZipOutputStream有中文乱码问题，所以采用org.apache.tools.zip.ZipOutputStream。
以下是代码：

    package net.szh.zip;  
      
    import java.io.BufferedInputStream;  
    import java.io.File;  
    import java.io.FileInputStream;  
    import java.io.FileOutputStream;  
    import java.util.zip.CRC32;  
    import java.util.zip.CheckedOutputStream;  
      
    import org.apache.tools.zip.ZipEntry;  
    import org.apache.tools.zip.ZipOutputStream;  
      
    public class ZipCompressor {  
        static final int BUFFER = 8192;  
      
        private File zipFile;  
      
        public ZipCompressor(String pathName) {  
            zipFile = new File(pathName);  
        }  
      
        public void compress(String srcPathName) {  
            File file = new File(srcPathName);  
            if (!file.exists())  
                throw new RuntimeException(srcPathName + "不存在！");  
            try {  
                FileOutputStream fileOutputStream = new FileOutputStream(zipFile);  
                CheckedOutputStream cos = new CheckedOutputStream(fileOutputStream,  
                        new CRC32());  
                ZipOutputStream out = new ZipOutputStream(cos);  
                String basedir = "";  
                compress(file, out, basedir);  
                out.close();  
            } catch (Exception e) {  
                throw new RuntimeException(e);  
            }  
        }  
      
        private void compress(File file, ZipOutputStream out, String basedir) {  
            /* 判断是目录还是文件 */  
            if (file.isDirectory()) {  
                System.out.println("压缩：" + basedir + file.getName());  
                this.compressDirectory(file, out, basedir);  
            } else {  
                System.out.println("压缩：" + basedir + file.getName());  
                this.compressFile(file, out, basedir);  
            }  
        }  
      
        /** 压缩一个目录 */  
        private void compressDirectory(File dir, ZipOutputStream out, String basedir) {  
            if (!dir.exists())  
                return;  
      
            File[] files = dir.listFiles();  
            for (int i = 0; i < files.length; i++) {  
                /* 递归 */  
                compress(files[i], out, basedir + dir.getName() + "/");  
            }  
        }  
      
        /** 压缩一个文件 */  
        private void compressFile(File file, ZipOutputStream out, String basedir) {  
            if (!file.exists()) {  
                return;  
            }  
            try {  
                BufferedInputStream bis = new BufferedInputStream(  
                        new FileInputStream(file));  
                ZipEntry entry = new ZipEntry(basedir + file.getName());  
                out.putNextEntry(entry);  
                int count;  
                byte data[] = new byte[BUFFER];  
                while ((count = bis.read(data, 0, BUFFER)) != -1) {  
                    out.write(data, 0, count);  
                }  
                bis.close();  
            } catch (Exception e) {  
                throw new RuntimeException(e);  
            }  
        }  
    }  

后来发现原来可以用ant中的org.apache.tools.ant.taskdefs.Zip来实现，更加简单。

    package net.szh.zip;  
      
    import java.io.File;  
      
    import org.apache.tools.ant.Project;  
    import org.apache.tools.ant.taskdefs.Zip;  
    import org.apache.tools.ant.types.FileSet;  
      
    public class ZipCompressorByAnt {  
      
        private File zipFile;  
      
        public ZipCompressorByAnt(String pathName) {  
            zipFile = new File(pathName);  
        }  
          
        public void compress(String srcPathName) {  
            File srcdir = new File(srcPathName);  
            if (!srcdir.exists())  
                throw new RuntimeException(srcPathName + "不存在！");  
              
            Project prj = new Project();  
            Zip zip = new Zip();  
            zip.setProject(prj);  
            zip.setDestFile(zipFile);  
            FileSet fileSet = new FileSet();  
            fileSet.setProject(prj);  
            fileSet.setDir(srcdir);  
            //fileSet.setIncludes("**/*.java"); 包括哪些文件或文件夹 eg:zip.setIncludes("*.java");  
            //fileSet.setExcludes(...); 排除哪些文件或文件夹  
            zip.addFileset(fileSet);  
              
            zip.execute();  
        }  
    }  

测试一下

package net.szh.zip;  
  
public class TestZip {  
    public static void main(String[] args) {  
        ZipCompressor zc = new  ZipCompressor("E:\\szhzip.zip");  
        zc.compress("E:\\test");  
          
        ZipCompressorByAnt zca = new ZipCompressorByAnt("E:\\szhzipant.zip");  
        zca.compress("E:\\test");  
    }  
}