利用java的ZipOutputStream类解压/解压缩文件或文件夹中的文件
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;
import java.util.zip.GZIPInputStream;
import java.io.DataInputStream;
public class Zips {
/**
* zip压缩功能测试. 将d:\\temp\\zipout目录下的所有文件连同子目录压缩到d:\\temp\\out.zip.
*
* @param baseDir 所要压缩的目录名（包含绝对路径）
* @param objFileName 压缩后的文件名
* @throws Exception
*/
public void createZip(String baseDir, String objFileName) throws Exception {
File folderObject = new File(baseDir);
if (folderObject.exists()){
List fileList = getSubFiles(new File(baseDir));
//压缩文件名
ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(objFileName));
ZipEntry ze = null;
byte[] buf = new byte[1024];
int readLen = 0;
for (int i = 0; i < fileList.size(); i++) {
File f = (File) fileList.get(i);
System.out.println("Adding: " + f.getPath() + f.getName());
//创建一个ZipEntry，并设置Name和其它的一些属性
ze = new ZipEntry(getAbsFileName(baseDir, f));
ze.setSize(f.length());
ze.setTime(f.lastModified());
//将ZipEntry加到zos中，再写入实际的文件内容
zos.putNextEntry(ze);
InputStream is = new BufferedInputStream(new FileInputStream(f));
while ((readLen = is.read(buf, 0, 1024)) != -1) {
zos.write(buf, 0, readLen);
}
is.close();
System.out.println("done...");
}
zos.close();
}else{
throw new Exception("this folder isnot exist!");
}
}
/**
* zip压缩功能测试. 将指定文件压缩后存到一压缩文件中
*
* @param baseDir 所要压缩的文件名
* @param objFileName 压缩后的文件名
* @return 压缩后文件的大小
* @throws Exception
*/
public long createFileToZip(String zipFilename,String sourceFileName) throws Exception {
File sourceFile = new File(sourceFileName);
byte[] buf = new byte[1024];
//压缩文件名
File objFile = new File(zipFilename);
ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(objFile));
ZipEntry ze = null;
//创建一个ZipEntry，并设置Name和其它的一些属性
ze = new ZipEntry(sourceFile.getName());
ze.setSize(sourceFile.length());
ze.setTime(sourceFile.lastModified());
//将ZipEntry加到zos中，再写入实际的文件内容
zos.putNextEntry(ze);
InputStream is = new BufferedInputStream(new FileInputStream(sourceFile));
int readLen = -1;
while ((readLen = is.read(buf, 0, 1024)) != -1) {
zos.write(buf, 0, readLen);
}
is.close();
zos.close();
return objFile.length();
}
/**
* 测试解压缩功能. 将d:\\download\\test.zip连同子目录解压到d:\\temp\\zipout目录下.
*
* @throws Exception
*/
public void releaseZipToFile(String sourceZip, String outFileName)throws IOException{
ZipFile zfile=new ZipFile(sourceZip);
System.out.println(zfile.getName());
Enumeration zList=zfile.entries();
ZipEntry ze=null;
byte[] buf=new byte[1024];
while(zList.hasMoreElements()){
//从ZipFile中得到一个ZipEntry
ze=(ZipEntry)zList.nextElement();
if(ze.isDirectory()){
continue;
}
//以ZipEntry为参数得到一个InputStream，并写到OutputStream中
OutputStream os=new BufferedOutputStream(new FileOutputStream(getRealFileName(outFileName, ze.getName())));
InputStream is=new BufferedInputStream(zfile.getInputStream(ze));
int readLen=0;
while ((readLen=is.read(buf, 0, 1024))!=-1) {
os.write(buf, 0, readLen);
}
is.close();
os.close();
System.out.println("Extracted: "+ze.getName());
}
zfile.close();
}
/**
* 取得指定目录下的所有文件列表，包括子目录.
*
* @param baseDir
* File 指定的目录
* @return 包含java.io.File的List
*/
private List getSubFiles(File baseDir) {
List ret = new ArrayList();
//File base=new File(baseDir);
File[] tmp = baseDir.listFiles();
for (int i = 0; i < tmp.length; i++) {
if (tmp[i].isFile()) {
ret.add(tmp[i]);
}
if (tmp[i].isDirectory()) {
ret.addAll(getSubFiles(tmp[i]));
}
}
return ret;
}
/**
* 给定根目录，返回一个相对路径所对应的实际文件名.
*
* @param baseDir
* 指定根目录
* @param absFileName
* 相对路径名，来自于ZipEntry中的name
* @return java.io.File 实际的文件
*/
private File getRealFileName(String baseDir, String absFileName) {
String[] dirs = absFileName.split("/");
//System.out.println(dirs.length);
File ret = new File(baseDir);
//System.out.println(ret);
if (dirs.length > 1) {
for (int i = 0; i < dirs.length - 1; i++) {
ret = new File(ret, dirs[i]);
}
}
if (!ret.exists()) {
ret.mkdirs();
}
ret = new File(ret, dirs[dirs.length - 1]);
return ret;
}
/**
* 给定根目录，返回另一个文件名的相对路径，用于zip文件中的路径.
*
* @param baseDir
* java.lang.String 根目录
* @param realFileName
* java.io.File 实际的文件名
* @return 相对文件名
*/
private String getAbsFileName(String baseDir, File realFileName) {
File real = realFileName;
File base = new File(baseDir);
String ret = real.getName();
while (true) {
real = real.getParentFile();
if (real == null)
break;
if (real.equals(base))
break;
else {
ret = real.getName() + "/" + ret;
}
}
System.out.println("K " + ret);
return ret;
}
public static void main(String args[]){
Zips manager = new Zips();
try {
// manager.createFileToZip("d:\\temp\\out.zip","");
manager.releaseZipToFile("d:\\temp\\out.zip","d:\\test");
//manager.createZip("d:\\temp\\zipout","d:\\temp\\out.zip");
}
catch (Exception e) {
e.printStackTrace();
}
System.out.println("END");
}
}
