Java comprime varios archivos en paquetes zip y descomprime paquetes zip y comprime varios archivos en secuencias de archivos zip y descomprime secuencias binarias zip (los archivos temporales no se generan en el medio, se comprimen directamente en secuencias binarias zip y se verifica la descompresión)
Este blog proporcionará dos métodos,
- Genere varios archivos para comprimirlos por adelantado y luego lea varias capas o capas de carpetas para atravesar el paquete zip comprimido.
- Use directamente el nombre del archivo original y el flujo binario, comprima y devuelva el flujo binario del paquete zip, sin generar archivos redundantes en el medio;
es obvio que el método 2 es mejor; - Descomprimir archivo zip o verificación de flujo de archivo zip;
1. Representación
Comprima los dos archivos en un paquete zip y analice el archivo del paquete zip y la secuencia binaria zip respectivamente, imprima el archivo y la representación detallada del contenido del archivo de la siguiente manera:
2. Código fuente
import java.io.*;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;
public class FileUtil {
public static void main(String[] args) throws Exception {
long timeStamp = System.currentTimeMillis();
String uuid = UUID.randomUUID().toString();
// 生成本地文件，然后压缩，压缩完成清除本地文件及冗余文件夹
zipTest1(uuid, timeStamp);
// 不生成中间文件，直接使用文件名称+文件流进行压缩 更优
zipTest2(uuid, timeStamp);
}
private static void zipTest2(String uuid, long timeStamp) throws IOException {
String zipFileName = String.format("%s_%s.zip", uuid, timeStamp);
String imgFileName = String.format("%s_%s_%s.json", "img", uuid, timeStamp);
String referInfoFile = String.format("%s_%s_%s.json", "ref", uuid, timeStamp);
String[] fileNames = new String[]{
imgFileName, referInfoFile};
List<byte[]> bytesList = new ArrayList<>();
byte[] file0 = imgFileName.toString().getBytes();
byte[] file1 = referInfoFile.toString().getBytes();
bytesList.add(file0);
bytesList.add(file1);
// zip压缩流
byte[] rodZip = packageZipToBytes(fileNames, bytesList);
readAndParseZip(zipFileName, rodZip);
}
private static void zipTest1(String uuid, long timeStamp) throws Exception {
String path = System.getProperty("user.dir") + File.separator + uuid + "_" + timeStamp + File.separator;
String resPath = System.getProperty("user.dir") + File.separator + "out" + File.separator + uuid + "_" + timeStamp;
deleteDirectory(path);
delOrCreateDir(path);
delOrCreateDir(resPath);
String imgFileName = String.format("%s%s_%s_%s.json", path, "img", uuid, timeStamp);
String referInfoFile = String.format("%s%s_%s_%s.json", path, "ref", uuid, timeStamp);
try (FileWriter fileWriter = new FileWriter(referInfoFile)) {
fileWriter.write(referInfoFile.toString());
}
try (FileWriter fileWriter = new FileWriter(imgFileName)) {
fileWriter.write(imgFileName.toString());
}
System.out.println("zip start ---------------" + System.currentTimeMillis());
FileUtil test3 = new FileUtil();
String packagePath = path; //选中的文件夹
test3.packageZip(packagePath, resPath + ".zip");
System.out.println("zip finish ---------------" + System.currentTimeMillis());
// 删除冗余文件，文件夹
deleteDirectory(path);
deleteDirectory(resPath);
deleteDirectory(resPath);
}
/**
* 压缩多个文件为zip包文件流
*
* @param fileNames 文件名称
* @param byteLists 文件流
* @return
*/
public static byte[] packageZipToBytes(String[] fileNames, List<byte[]> byteLists) throws IOException {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
ZipOutputStream zipOutputStream = null;
try {
zipOutputStream = new ZipOutputStream(bos);
for (int i = 0; i < fileNames.length; i++) {
String fileName = fileNames[i];
fileName = fileName.substring(fileName.lastIndexOf(File.separator) + 1);
byte[] content = byteLists.get(i);
// 依次对每个文件都压缩
try {
zipOutputStream.putNextEntry(new ZipEntry(fileName));
zipOutputStream.write(content);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
zipOutputStream.close();
bos.close();
} catch (FileNotFoundException e) {
throw new RuntimeException(e);
} catch (IOException e) {
throw new RuntimeException(e);
}
byte[] zipOutBytes = bos.toByteArray();
/* OutputStream fos = new FileOutputStream("D:\\study\\ark-common-model\\out\\aaaaaaaa_1689583754986.zip");
fos.write(zipOutBytes, 0, zipOutBytes.length);
fos.close();*/
return zipOutBytes;
}
private static void readAndParseZip(String zipFilePath, byte[] rodZip) {
ByteArrayInputStream fis = null;
FileInputStream fileInputStream = null;
ZipInputStream zis = null;
try {
if (rodZip != null) {
fis = new ByteArrayInputStream(rodZip);
zis = new ZipInputStream(fis);
} else {
fileInputStream = new FileInputStream(zipFilePath);
zis = new ZipInputStream(fileInputStream);
}
ZipEntry zipEntry = zis.getNextEntry();
while (zipEntry != null) {
// 如果该项是一个文件
if (!zipEntry.isDirectory()) {
String fileName = zipEntry.getName();
ByteArrayOutputStream bos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len;
while ((len = zis.read(buffer)) > 0) {
bos.write(buffer, 0, len);
}
// 将解压出的文件流输出到控制台
String content = bos.toString();
System.out.println("fileName: " + fileName + ",content: " + content);
}
zis.closeEntry();
zipEntry = zis.getNextEntry();
}
zis.close();
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
public static void delOrCreateDir(String imgPath) {
File file = new File(imgPath);
if (!file.getParentFile().exists()) {
//上级目录不存在，创建上级目录
file.getParentFile().mkdirs();
} else {
// FileUtils.deleteFolder(imgPath);
}
file.mkdirs();
}
/**
* 根据路径删除指定的目录或文件，无论存在与否
*
* @param sPath 要删除的目录或文件
* @return 删除成功返回 true，否则返回 false。
*/
public static boolean deleteFolder(String sPath) {
boolean flag = false;
File file = new File(sPath);
// 判断目录或文件是否存在
if (!file.exists()) {
// 不存在返回 false
return flag;
} else {
// 判断是否为文件
if (file.isFile()) {
// 为文件时调用删除文件方法
return deleteFile(sPath);
} else {
// 为目录时调用删除目录方法
return deleteDirectory(sPath);
}
}
}
/**
* 删除单个文件
*
* @param sPath 被删除文件的文件名
* @return 单个文件删除成功返回true，否则返回false
*/
public static boolean deleteFile(String sPath) {
boolean flag = false;
File file = new File(sPath);
// 路径为文件且不为空则进行删除
if (file.isFile() && file.exists()) {
file.delete();
flag = true;
}
return flag;
}
/**
* 删除目录（文件夹）以及目录下的文件
*
* @param sPath 被删除目录的文件路径
* @return 目录删除成功返回true，否则返回false
*/
public static boolean deleteDirectory(String sPath) {
boolean flag = false;
//如果sPath不以文件分隔符结尾，自动添加文件分隔符
if (!sPath.endsWith(File.separator)) {
sPath = sPath + File.separator;
}
File dirFile = new File(sPath);
//如果dir对应的文件不存在，或者不是一个目录，则退出
if (!dirFile.exists() || !dirFile.isDirectory()) {
return false;
}
flag = true;
//删除文件夹下的所有文件(包括子目录)
File[] files = dirFile.listFiles();
for (int i = 0; i < files.length; i++) {
//删除子文件
if (files[i].isFile()) {
flag = deleteFile(files[i].getAbsolutePath());
if (!flag) {
break;
}
} //删除子目录
else {
flag = deleteDirectory(files[i].getAbsolutePath());
if (!flag) {
break;
}
}
}
if (!flag) {
return false;
}
//删除当前目录
if (dirFile.delete()) {
// dirFile.getParentFile().delete();
return true;
} else {
// dirFile.getParentFile().delete();
return false;
}
}
public void packageZip(String filesPath, String resPath) throws Exception {
// 要被压缩的文件夹
File file = new File(filesPath); //需要压缩的文件夹
File zipFile = new File(resPath);
ZipOutputStream zipOut = new ZipOutputStream(new FileOutputStream(zipFile));
isDirectory(file, zipOut, "", true); //判断是否为文件夹
zipOut.close();
}
public void isDirectory(File file, ZipOutputStream zipOutputStream, String filePath, boolean flag) throws
IOException {
//判断是否为问加减
if (file.isDirectory()) {
File[] files = file.listFiles(); //获取该文件夹下所有文件(包含文件夹)
filePath = flag == true ? file.getName() : filePath + File.separator + file.getName(); //首次为选中的文件夹，即根目录，之后递归实现拼接目录
for (int i = 0; i < files.length; ++i) {
//判断子文件是否为文件夹
if (files[i].isDirectory()) {
System.out.println("-----" + files[i].getName());
//进入递归,flag置false 即当前文件夹下仍包含文件夹
isDirectory(files[i], zipOutputStream, filePath, false);
} else {
System.out.println("fileName: " + files[i].getName());
//不为文件夹则进行压缩
InputStream input = new FileInputStream(files[i]);
zipOutputStream.putNextEntry(new ZipEntry(files[i].getName()));
int temp = 0;
while ((temp = input.read()) != -1) {
zipOutputStream.write(temp);
}
input.close();
}
}
} else {
//将子文件夹下的文件进行压缩
InputStream input = new FileInputStream(file);
zipOutputStream.putNextEntry(new ZipEntry(file.getPath()));
int temp = 0;
while ((temp = input.read()) != -1) {
zipOutputStream.write(temp);
}
input.close();
}
}
}