js|压缩

zip方法 zipPath参数为保存zip的文件路径  srcPath参数为需要压缩的目录   在linux window上面测试无问题！主要是编码问题比较麻烦~要是有其他异常 请留言 或者 有什么更好的方法 欢迎给更多的意见

//zip zhe folder
void zip(String zipPath, String srcPath,javax.servlet.jsp.JspWriter out) throws Exception {
    FileOutputStream output = null;
    ZipOutputStream zipOutput = null;
    try{
        output = new FileOutputStream(zipPath);
        zipOutput = new ZipOutputStream(output);
        zipEntry(zipOutput,srcPath,srcPath,zipPath);
    }catch(Exception e){
        out.print("file zip error");
    }finally{
        if(zipOutput!=null)zipOutput.close();
    }
    out.print("zip ok"+zipPath);
}
//add the zip entry
void zipEntry(ZipOutputStream zipOs, String initPath,String filePath,String zipPath) throws Exception {
    String entryName = filePath;
    File f = new File(filePath);
    if (f.isDirectory()){// ??
        String[] files = f.list();
        for(int i = 0; i < files.length; i++)
            zipEntry(zipOs, initPath, filePath + File.separator + files[i],zipPath);
        return;
    }
    String chPh = initPath.substring(initPath.lastIndexOf("/") + 1);// ?????
    int idx=initPath.lastIndexOf(chPh);
    if (idx != -1) {
        entryName = filePath.substring(idx);
    }
    ZipEntry entry;
    entry = new ZipEntry(entryName);
    File ff = new File(filePath);
    if(ff.getAbsolutePath().equals(zipPath))return;
    entry.setSize(ff.length());
    entry.setTime(ff.lastModified());
    //the CRC efficacy 
    entry.setCrc(0);
    CRC32 crc = new CRC32();
    crc.reset();
    zipOs.putNextEntry(entry);
    int len = 0;
    byte[] buffer = new byte[2048];
    int bufferLen = 2048;
    FileInputStream input =null;
    try{
        input = new FileInputStream(filePath);
        while ((len = input.read(buffer, 0, bufferLen)) != -1) {
                zipOs.write(buffer, 0, len);
                crc.update(buffer, 0, len);
        }
    }catch(Exception e){
    }finally{
        if(input!=null)input.close();
    }
    entry.setCrc(crc.getValue());
}