若是使用Java自带的压缩工具包来实现解压缩文件到指定文件夹的功能，因为jdk提供的zip只能按UTF-8格式处理，而Windows系统中文件名是以GBK方式编码的，所以如果是解压一个包含中文文件名的zip包，会报非法参数异常，所以要实现解压缩，就得对DeflaterOutputStream.java、InflaterInputStream.java、ZipConstants.java、ZipEntry.java、ZipInputStream.java以及ZipOutputStream.java这些相关的类进行修改，过程如下：
因为从 J2SE 1.4 开始，Java 编译器不再支持 import 进未命包名的类、接口，所以在创建的Java项目中，一定要新建一个自己定义的包，包命名的格式一般为学校域名的逆序+自己的网名，比如cn.edu.xidian.crytoll。
在包内新建DeflaterOutputStream类，代码如下：
DeflaterOutputStream.java:
代码如下:
package cn.edu.xdian.crytoll;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.zip.Deflater;
/**
* This class implements an output stream filter for compressing data in
* the "deflate" compression format. It is also used as the basis for other
* types of compression filters, such as GZIPOutputStream.
*
* @see Deflater
* @version 1.36, 03/13/06
* @author David Connelly
*/
public
class DeflaterOutputStream extends FilterOutputStream {
/**
* Compressor for this stream.
*/
protected Deflater def;
/**
* Output buffer for writing compressed data.
*/
protected byte[] buf;
/**
* Indicates that the stream has been closed.
*/
private boolean closed = false;
/**
* Creates a new output stream with the specified compressor and
* buffer size.
* @param out the output stream
* @param def the compressor ("deflater")
* @param size the output buffer size
* @exception IllegalArgumentException if size is