package com.chen.stu.io;
import java.io.*;
import java.util.ArrayList;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;
/**
* Zip压缩/解压缩工具类
* 实现对目标路径及其子路径下的所有文件及空目录的压缩
* 参考网上若干种实现，并修改其bug
*
*/
public class ZipUtil {
/** 缓冲器大小 */
private static final int BUFFER = 512;
/**
* 取的给定源目录下的所有文件及空的子目录
* 递归实现
*
* @param srcFile
*
* @return
*/
private static List<File> getAllFiles(File srcFile) {
List<File> fileList = new ArrayList<File>();
File[] tmp = srcFile.listFiles();
for (int i = 0; i < tmp.length; i++) {
if (tmp[i].isFile()) {
fileList.add(tmp[i]);
System.out.println("add file: "+tmp[i].getName());
}
if (tmp[i].isDirectory()) {
if (tmp[i].listFiles().length!=0){//若不是空目录，则递归添加其下的目录和文件
fileList.addAll(getAllFiles(tmp[i]));
}
else{//若是空目录，则添加这个目录到fileList
fileList.add(tmp[i]);
System.out.println("add empty dir: "+tmp[i].getName());
}
}
} // end for
return fileList;
}
/**
* 取相对路径
* 依据文件名和压缩源路径得到文件在压缩源路径下的相对路径
*
* @param dirPath 压缩源路径
* @param file
*
* @return 相对路径
*/
private static String getRelativePath(String dirPath, File file) {
File dir = new File(dirPath);
String relativePath = file.getName();
while (true) {
file = file.getParentFile();
if (file == null) {
break;
}
if (file.equals(dir)) {
break;
} else {
relativePath = file.getName() + "/" + relativePath;
}
} // end while
return relativePath;
}
/**
* 创建文件
* 根据压缩包内文件名和解压缩目的路径，创建解压缩目标文件，
* 生成中间目录
* @param dstPath 解压缩目的路径
* @param fileName 压缩包内文件名
*
* @return 解压缩目标文件
*
* @throws IOException
*/
private static File createFile(String dstPath, String fileName) throws IOException {
String[] dirs = fileName.split("/");//将文件名的各级目录分解
File file = new File(dstPath);
if (dirs.length > 1) {//文件有上级目录
for (int i = 0; i < dirs.length - 1; i++) {
file = new File(file, dirs[i]);//依次创建文件对象知道文件的上一级目录
}
if (!file.exists()) {
file.mkdirs();//文件对应目录若不存在，则创建
System.out.println("mkdirs: " + file.getCanonicalPath());
}
file = new File(file, dirs[dirs.length - 1]);//创建文件
return file;
} else {
if (!file.exists()) {
file.mkdirs();//若目标路径的目录不存在，则创建
System.out.println("mkdirs: " + file.getCanonicalPath());
}
file = new File(file, dirs[0]);//创建文件
return file;
}
}
/**
* 解压缩方法
*
*
* @param zipFileName 压缩文件名
* @param dstPath 解压目标路径
*
* @return
*/
public static boolean unzip(String zipFileName, String dstPath) {
System.out.println("zip uncompressing...");
try {
@SuppressWarnings("resource")
ZipInputStream zipInputStream = new ZipInputStream(new FileInputStream(zipFileName));
ZipEntry zipEntry = null;
byte[] buffer = new byte[BUFFER];//缓冲器
int readLength = 0;//每次读出来的长度
while ((zipEntry = zipInputStream.getNextEntry()) != null) {
if (zipEntry.isDirectory()) {//若是zip条目目录，则需创建这个目录
File dir = new File(dstPath + "/" + zipEntry.getName());
if (!dir.exists()) {
dir.mkdirs();
System.out.println("mkdirs: " + dir.getCanonicalPath());
continue;//跳出
}
}
File file = createFile(dstPath, zipEntry.getName());//若是文件，则需创建该文件
System.out.println("file created: " + file.getCanonicalPath());
OutputStream outputStream = new FileOutputStream(file);
while ((readLength = zipInputStream.read(buffer, 0, BUFFER)) != -1) {
outputStream.write(buffer, 0, readLength);
}
outputStream.close();
System.out.println("file uncompressed: " + file.getCanonicalPath());
} // end while
} catch (FileNotFoundException e) {
System.out.println(e.getMessage());
e.printStackTrace();
System.out.println("unzip fail!");
return false;
} catch (IOException e) {
System.out.println(e.getMessage());
e.printStackTrace();
System.out.println("unzip fail!");
return false;
}
System.out.println("unzip success!");
return true;
}
/**
* 压缩方法
* （可以压缩空的子目录）
* @param srcPath 压缩源路径
* @param zipFileName 目标压缩文件
*
* @return
*/
public static boolean zip(String srcPath, String zipFileName) {
System.out.println("zip compressing...");
File srcFile = new File(srcPath);
List<File> fileList = getAllFiles(srcFile);//所有要压缩的文件
byte[] buffer = new byte[BUFFER];//缓冲器
ZipEntry zipEntry = null;
int readLength = 0;//每次读出来的长度
try {
ZipOutputStream zipOutputStream = new ZipOutputStream(new FileOutputStream(zipFileName));
for (File file : fileList) {
if (file.isFile()){//若是文件，则压缩这个文件
zipEntry = new ZipEntry(getRelativePath(srcPath, file));
zipEntry.setSize(file.length());
zipEntry.setTime(file.lastModified());
zipOutputStream.putNextEntry(zipEntry);
InputStream inputStream = new BufferedInputStream(new FileInputStream(file));
while ((readLength = inputStream.read(buffer, 0, BUFFER)) != -1) {
zipOutputStream.write(buffer, 0, readLength);
}
inputStream.close();
System.out.println("file compressed: " + file.getCanonicalPath());
}else {//若是目录（即空目录）则将这个目录写入zip条目
zipEntry = new ZipEntry(getRelativePath(srcPath, file)+"/");
zipOutputStream.putNextEntry(zipEntry);
System.out.println("dir compressed: " + file.getCanonicalPath()+"/");
}
} // end for
zipOutputStream.close();
} catch (FileNotFoundException e) {
System.out.println(e.getMessage());
e.printStackTrace();
System.out.println("zip fail!");
return false;
} catch (IOException e) {
System.out.println(e.getMessage());
e.printStackTrace();
System.out.println("zip fail!");
return false;
}
System.out.println("zip success!");
return true;
}
public static void main(String[] args) {
zip("C:\\Users\\jj\\Desktop\\区政府原型_安全巡查20181008", "D:\\TE.zip");
}
}
//~ Formatted by Jindent --- http://www.jindent.com
java实现压缩、解压
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转载自blog.csdn.net/qq_33460264/article/details/84245142
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