zip文件解压或压缩

<span style="font-size:18px;">/**
 * lsz
 */
public final class ZipUtil {

	/**
	 * 解压zip文件
	 * @param unZipfile
	 * @param destFile
	 */
	public static void unZip(String unZipfile, String destFile) {
        FileOutputStream fileOut;
        File file;
        InputStream inputStream;
        byte[]   buf = new byte[1024*4];
        try {
            //生成一个zip的文件
        	ZipFile   zipFile = new ZipFile(unZipfile, "GBK");
            //遍历zipFile中所有的实体，并把他们解压出来
            for (@SuppressWarnings("unchecked")
            Enumeration<ZipEntry> entries = zipFile.getEntries(); entries
                    .hasMoreElements();) {
                ZipEntry entry =  entries.nextElement();
                //生成他们解压后的一个文件
                file = new File(destFile+File.separator+entry.getName());

                if (entry.isDirectory()) {
                    file.mkdirs();
                } else {
                    // 如果指定文件的目录不存在,则创建之.
                    File parent = file.getParentFile();
                    if (!parent.exists()) {
                        parent.mkdirs();
                    }
                    //获取出该压缩实体的输入流
                    inputStream = zipFile.getInputStream(entry);

                    fileOut = new FileOutputStream(file);
                    int length = 0;
                    //将实体写到本地文件中去
                    while ((length = inputStream.read(buf)) > 0) {
                        fileOut.write(buf, 0, length);
                    }
                    fileOut.close();
                    inputStream.close();
                }
            }
            zipFile.close();
            //解压完后将原压缩文件删除
            File zipfile = new File(unZipfile);
			if(zipfile.exists()){
				zipfile.delete();
			}
        } catch (IOException ioe) {
            ioe.printStackTrace();
        }
    }

	/**
	 * 一个文件夹压缩
	 * 压缩文件夹
	 * @param filepath
	 * @param savepath
	 * @throws Exception
	 */
	  public static void toZip(String filepath,String savepath) throws Exception{
		  File file = new File(filepath);
		  if(file.exists()){
			  //判断导出路径是否为空，如果为空，则将压缩包生成到当前路径下
			  if(StringUtils.isBlank(savepath)){
				  savepath = filepath+".zip";
			  }else{
				  savepath = savepath+".zip";
			  }
			  ZipOutputStream outPut = new ZipOutputStream(new FileOutputStream(new File(savepath)));
		      outPut.setEncoding("GBK");//设置编码
		      createZip(outPut,file.listFiles(),null);
		      outPut.flush();
		      outPut.close();
		  }else{
			  //not found
			  throw new RuntimeException("Err ：not found file exception："+filepath);
		  }
	  }

	  private static void createZip(org.apache.tools.zip.ZipOutputStream outPut,File[] listFiles,String fuPath) throws Exception {
	        for(File f : listFiles){
	            String name = fuPath==null?f.getName():fuPath+"/"+f.getName();;
	            if(f.isDirectory()){
	                outPut.putNextEntry(new ZipEntry(name+"/"));
	                createZip(outPut,f.listFiles(),name);
	            }else{
	                outPut.putNextEntry(new ZipEntry(name));
	                InputStream is = new FileInputStream(f);
	                byte[] bys = new byte[1024];
	                int len = 0;
	                while((len = is.read(bys))!=-1)
	                    outPut.write(bys, 0, len);
	                is.close();
	                outPut.flush();
	            }
	        }
	    } 

	  /*
	   * 复制文件 只能使复制文件，不能复制文件夹
	   */
	  public static void fileChannelCopy(File fromfile, File tofile) {
	        FileInputStream fi = null;
	        FileOutputStream fo = null;
	        FileChannel in = null;
	        FileChannel out = null;
	        try {
	            fi = new FileInputStream(fromfile);
	            fo = new FileOutputStream(tofile);
	            in = fi.getChannel();//得到对应的文件通道
	            out = fo.getChannel();//得到对应的文件通道
	            in.transferTo(0, in.size(), out);//连接两个通道，并且从in通道读取，然后写入out通道
	        } catch (IOException e) {
	            e.printStackTrace();
	        } finally {
	            try {
	                fi.close();
	                in.close();
	                fo.close();
	                out.close();
	            } catch (IOException e) {
	                e.printStackTrace();
	            }
	        }
	    }
}</span>