专业的制作网站开发公司,优化大师会员兑换码,广州做营销网站公司,网络维护管理若是使用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#xff0c;因为jdk提供的zip只能按UTF-8格式处理#xff0c;而Windows系统中文件名是以GBK方式编码的#xff0c;所以如果是解压一个包含中文文件名的zip包#xff0c;会报非法参数异常#xff0c;所以要…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: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*/publicclass 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 0*/public DeflaterOutputStream(OutputStream out, Deflater def, int size) {super(out);if (out null || def null) {throw new NullPointerException();} else if (size 0) {throw new IllegalArgumentException(buffer size 0);}this.def def;buf new byte[size];}/*** Creates a new output stream with the specified compressor and* a default buffer size.* param out the output stream* param def the compressor (deflater)*/public DeflaterOutputStream(OutputStream out, Deflater def) {this(out, def, 512);}boolean usesDefaultDeflater false;/*** Creates a new output stream with a default compressor and buffer size.* param out the output stream*/public DeflaterOutputStream(OutputStream out) {this(out, new Deflater());usesDefaultDeflater true;}/*** Writes a byte to the compressed output stream. This method will* block until the byte can be written.* param b the byte to be written* exception IOException if an I/O error has occurred*/public void write(int b) throws IOException {byte[] buf new byte[1];buf[0] (byte)(b 0xff);write(buf, 0, 1);}/*** Writes an array of bytes to the compressed output stream. This* method will block until all the bytes are written.* param b the data to be written* param off the start offset of the data* param len the length of the data* exception IOException if an I/O error has occurred*/public void write(byte[] b, int off, int len) throws IOException {if (def.finished()) {throw new IOException(write beyond end of stream);}if ((off | len | (off len) | (b.length - (off len))) 0) {throw new IndexOutOfBoundsException();} else if (len 0) {return;}if (!def.finished()) {// Deflate no more than stride bytes at a time. This avoids// excess copying in deflateBytes (see Deflater.c)int stride buf.length;for (int i 0; i len; i stride) {def.setInput(b, off i, Math.min(stride, len - i));while (!def.needsInput()) {deflate();}}}}/*** Finishes writing compressed data to the output stream without closing* the underlying stream. Use this method when applying multiple filters* in succession to the same output stream.* exception IOException if an I/O error has occurred*/public void finish() throws IOException {if (!def.finished()) {def.finish();while (!def.finished()) {deflate();}}}/*** Writes remaining compressed data to the output stream and closes the* underlying stream.* exception IOException if an I/O error has occurred*/public void close() throws IOException {if (!closed) {finish();if (usesDefaultDeflater)def.end();out.close();closed true;}}/*** Writes next block of compressed data to the output stream.* throws IOException if an I/O error has occurred*/protected void deflate() throws IOException {int len def.deflate(buf, 0, buf.length);if (len 0) {out.write(buf, 0, len);}}}
