使用壓縮流需要注意的是
壓縮輸入流的available方法返回的永遠是1或者0

import java.util.zip.*;
import java.io.*;
public class ZipUtil {
public static void main(String[] args) throws IOException {
unzip("/home/lihuilin/桌面/src.zip", "/home/lihuilin/桌面/tar/");
zip("/home/lihuilin/桌面/tar/", "/home/lihuilin/桌面/target.zip");
}
public static void unzip(String source, String target) throws IOException {
File t = new File(target);
if (!t.exists()) {
t.mkdirs();
}
ZipInputStream in = new ZipInputStream(new BufferedInputStream(new FileInputStream(source)));
String filepath = target;
ZipEntry entry = null;
int b;
while ((entry = in.getNextEntry()) != null) {
if (entry.isDirectory()) {
new File(filepath + entry.getName()).mkdirs();
} else {
System.out.println(filepath + entry.getName());
BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(filepath + entry.getName()));
while ((b = in.read()) != -1) {
out.write(b);
}
in.closeEntry();
out.flush();
out.close();
}
}
in.close();
}
public static void zip(String source, String target) throws IOException {
ZipOutputStream out = new ZipOutputStream(new FileOutputStream(target));
for (File file : new File(source).listFiles()) {
zip(file, out, source);
}
out.close();
}
private static void zip(File file, ZipOutputStream out, String filepath) throws IOException {
if (file.isDirectory()) {
for (File f : file.listFiles()) {
zip(f, out, filepath);
}
} else {
ZipEntry entry = new ZipEntry(file.getPath().replaceAll(filepath, ""));
out.putNextEntry(entry);
FileInputStream fis = new FileInputStream(file.toString());
int i = 0;
while ((i = fis.read()) != -1) {
out.write(i);
}
fis.close();
out.flush();
out.closeEntry();
}
}
}

使用GZIP壓縮

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
public class GZIPUtil {
public static void main(String[] args) throws IOException {
compress("C:\\Users\\new\\Desktop\\原始檔.txt", "C:\\Users\\new\\Desktop\\目標檔案.txt");
decompress("C:\\Users\\new\\Desktop\\目標檔案.txt", "C:\\Users\\new\\Desktop\\解壓檔案.txt");
}
private static void decompress(String source, String target) throws IOException {
GZIPInputStream in = new GZIPInputStream(new BufferedInputStream(new FileInputStream(source)));
BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(target));
int b = 0;
while ((b = in.read()) != -1) {
out.write(b);
}
out.flush();
out.close();
in.close();
}
private static void compress(String source, String target) throws IOException {
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(source));
GZIPOutputStream out = new GZIPOutputStream(new BufferedOutputStream(new FileOutputStream(target)));
byte[] data = new byte[bis.available()];
bis.read(data);
out.write(data);
out.flush();
out.close();
bis.close();
}
}

Java使用Zip壓縮

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