jdk提供了Zip相关的类方便的实现压缩和解压缩。使用方法很简单。下边分别是压缩和解压缩的简单事例
1，压缩的
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import java.io.BufferedInputStream;
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import java.io.BufferedOutputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.util.zip.ZipEntry;
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import java.util.zip.ZipOutputStream;
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public class Zip ![]()
{
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static final int BUFFER = 2048;
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public static void main(String argv[]) ![]()
{
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try ![]()
{
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BufferedInputStream origin = null;
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FileOutputStream dest = new FileOutputStream("E:\\test\\myfiles.zip");
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ZipOutputStream out = new ZipOutputStream(new BufferedOutputStream(
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dest));
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byte data[] = new byte[BUFFER];
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File f = new File("e:\\test\\a\\");
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File files[] = f.listFiles();
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for (int i = 0; i < files.length; i++) ![]()
{
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FileInputStream fi = new FileInputStream(files[i]);
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origin = new BufferedInputStream(fi, BUFFER);
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ZipEntry entry = new ZipEntry(files[i].getName());
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out.putNextEntry(entry);
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int count;
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while ((count = origin.read(data, 0, BUFFER)) != -1) ![]()
{
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out.write(data, 0, count);
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}
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origin.close();
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}
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out.close();
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} catch (Exception e) ![]()
{
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e.printStackTrace();
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}
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}
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}
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2，解压缩的。
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import java.io.BufferedInputStream;
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import java.io.BufferedOutputStream;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.util.Enumeration;
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import java.util.zip.ZipEntry;
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import java.util.zip.ZipFile;
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public class UnZip ![]()
{
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static final int BUFFER = 2048;
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public static void main(String argv[]) ![]()
{
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try ![]()
{
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String fileName = "E:\\test\\myfiles.zip";
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String filePath = "E:\\test\\";
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ZipFile zipFile = new ZipFile(fileName);
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Enumeration emu = zipFile.entries();
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int i=0;
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while(emu.hasMoreElements())![]()
{
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ZipEntry entry = (ZipEntry)emu.nextElement();
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//会把目录作为一个file读出一次，所以只建立目录就可以，之下的文件还会被迭代到。
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if (entry.isDirectory())
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{
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new File(filePath + entry.getName()).mkdirs();
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continue;
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}
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BufferedInputStream bis = new BufferedInputStream(zipFile.getInputStream(entry));
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File file = new File(filePath + entry.getName());
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//加入这个的原因是zipfile读取文件是随机读取的，这就造成可能先读取一个文件
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//而这个文件所在的目录还没有出现过，所以要建出目录来。
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File parent = file.getParentFile();
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if(parent != null && (!parent.exists()))![]()
{
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parent.mkdirs();
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}
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FileOutputStream fos = new FileOutputStream(file);
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BufferedOutputStream bos = new BufferedOutputStream(fos,BUFFER);
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int count;
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byte data[] = new byte[BUFFER];
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while ((count = bis.read(data, 0, BUFFER)) != -1)
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{
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bos.write(data, 0, count);
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}
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bos.flush();
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bos.close();
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bis.close();
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}
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zipFile.close();
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} catch (Exception e) ![]()
{
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e.printStackTrace();
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}
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}
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}
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1，压缩的
import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.util.zip.ZipEntry;import java.util.zip.ZipOutputStream;
public class Zip 
{
static final int BUFFER = 2048;
public static void main(String argv[]) { try { BufferedInputStream origin = null; FileOutputStream dest = new FileOutputStream("E:\\test\\myfiles.zip"); ZipOutputStream out = new ZipOutputStream(new BufferedOutputStream( dest)); byte data[] = new byte[BUFFER]; File f = new File("e:\\test\\a\\"); File files[] = f.listFiles(); for (int i = 0; i < files.length; i++) { FileInputStream fi = new FileInputStream(files[i]); origin = new BufferedInputStream(fi, BUFFER); ZipEntry entry = new ZipEntry(files[i].getName()); out.putNextEntry(entry); int count; while ((count = origin.read(data, 0, BUFFER)) != -1) { out.write(data, 0, count);
} origin.close(); } out.close(); } catch (Exception e) { e.printStackTrace(); } }
}2，解压缩的。
import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileOutputStream;import java.util.Enumeration;import java.util.zip.ZipEntry;import java.util.zip.ZipFile;public class UnZip { static final int BUFFER = 2048; public static void main(String argv[]) { try { String fileName = "E:\\test\\myfiles.zip"; String filePath = "E:\\test\\"; ZipFile zipFile = new ZipFile(fileName); Enumeration emu = zipFile.entries(); int i=0; while(emu.hasMoreElements()){ ZipEntry entry = (ZipEntry)emu.nextElement(); //会把目录作为一个file读出一次，所以只建立目录就可以，之下的文件还会被迭代到。 if (entry.isDirectory()) { new File(filePath + entry.getName()).mkdirs(); continue; } BufferedInputStream bis = new BufferedInputStream(zipFile.getInputStream(entry)); File file = new File(filePath + entry.getName()); //加入这个的原因是zipfile读取文件是随机读取的，这就造成可能先读取一个文件 //而这个文件所在的目录还没有出现过，所以要建出目录来。 File parent = file.getParentFile(); if(parent != null && (!parent.exists())){ parent.mkdirs(); } FileOutputStream fos = new FileOutputStream(file); BufferedOutputStream bos = new BufferedOutputStream(fos,BUFFER); int count; byte data[] = new byte[BUFFER]; while ((count = bis.read(data, 0, BUFFER)) != -1) { bos.write(data, 0, count); } bos.flush(); bos.close(); bis.close(); } zipFile.close(); } catch (Exception e) { e.printStackTrace(); } }}dreamstone 2007-08-09 09:33 发表评论