一个用java实现的压缩工具
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;
/**
* 压缩工具类
* @author liunn
*
*/
public class ZipUtil {
private String zipFileName; // 目的地ZIP文件
private String sourceFileName; // 源文件(待压缩的文件或文件夹)
public ZipUtil(String zipFileName, String sourceFileName) {
this.zipFileName = zipFileName;
this.sourceFileName = sourceFileName;
}
public void zip() throws Exception {
ZipOutputStream out = null;
BufferedOutputStream bos = null;
try {
// 创建ZIP输出
out = new ZipOutputStream(new FileOutputStream(zipFileName));
// 创建缓冲输出
bos = new BufferedOutputStream(out);
File sourceFile = new File(sourceFileName);
// 调用函数
compress(out, bos, sourceFile, sourceFile.getName());
} finally {
if (bos != null) {
bos.flush();
bos.close();
}
if (out != null) {
out.close();
}
}
}
public void compress(ZipOutputStream out, BufferedOutputStream bos, File sourceFile, String base) throws Exception {
// 如果路径为目录(文件夹)
if (sourceFile.isDirectory()) {
// 取出文件夹中的文件(或子文件夹)
File[] flist = sourceFile.listFiles();
if (flist.length == 0)// 如果文件夹为空,则只在目的地zip文件中写入一个目录进入点
{
out.putNextEntry(new ZipEntry(base + "/"));
} else// 如果文件夹不为空,则递归调用compress,文件夹中的每一个文件(或文件夹)进行压
{
for (int i = 0; i < flist.length; i++) {
compress(out, bos, flist[i], base + "/" + flist[i].getName());
}
}
} else// 如果不是目录(文件夹),即为文件,则先写入目录进入点,之后将文件写入zip文件
{
FileInputStream fos = null;
BufferedInputStream bis = null;
try {
out.putNextEntry(new ZipEntry(base));
fos = new FileInputStream(sourceFile);
bis = new BufferedInputStream(fos);
int tag;
// 将源文件写入到zip文件
while ((tag = bis.read()) != -1) {
bos.write(tag);
}
} finally {
if (bos != null) {
bos.flush();
}
if (bis != null) {
bis.close();
}
if (fos != null) {
fos.close();
}
}
}
}
public void dezip(String sourceFileName, String targetFileName,String oldEntryName){
File file = new File(sourceFileName);
try {
ZipFile zf = new ZipFile(file);
ZipEntry entry = zf.getEntry(oldEntryName);
File f = new File(targetFileName);
f.createNewFile();
InputStream is = zf.getInputStream(entry);
FileOutputStream fos = new FileOutputStream(f);
int count;
byte[] buf = new byte[8192];
while ((count = is.read(buf)) != -1) {
fos.write(buf, 0, count);
}
fos.close();
is.close();
zf.close();
}catch(Exception ex) {
ex.printStackTrace();
}
}
}