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压缩文件：一般用于前后端文件的传输，减少网络传输的带宽。
一、完整源码，亲测有效
import java.io.*;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.zip.*;
/**
* 压缩文件工具类
*
* @author Admin
*/
public class ZipUtil {
/**
* 缓冲器大小
*/
private static final int BUFFER = 512;
/**
* 压缩得到的文件的后缀名
*/
private static final String SUFFIX = ".zip";
/**
* 得到源文件路径的所有文件
*
* @param dirFile 压缩源文件路径
*/
public static List<File> getAllFile(File dirFile) {
List<File> fileList = new ArrayList<>();
File[] files = dirFile.listFiles();
for (File file : files) {//文件
if (file.isFile()) {
fileList.add(file);
System.out.println("add file:" + file.getName());
} else {//目录
if (file.listFiles().length != 0) {//非空目录
fileList.addAll(getAllFile(file));//把递归文件加到fileList中
} else {//空目录
fileList.add(file);
System.out.println("add empty dir:" + file.getName());
}
}
}
return fileList;
}
/**
* 获取相对路径
*
* @param dirPath 源文件路径
* @param file 准备压缩的单个文件
*/
public static String getRelativePath(String dirPath, File file) {
File dirFile = new File(dirPath);
String relativePath = file.getName();
while (true) {
file = file.getParentFile();
if (file == null) break;
if (file.equals(dirFile)) {
break;
} else {
relativePath = file.getName() + "/" + relativePath;
}
}
return relativePath;
}
/**
* @param destPath 解压目标路径
* @param fileName 解压文件的相对路径
*/
public static File createFile(String destPath, String fileName) {
String[] dirs = fileName.split("/");//将文件名的各级目录分解
File file = new File(destPath);
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
try {
System.out.println("mkdirs: " + file.getCanonicalPath());
} catch (IOException e) {
e.printStackTrace();
}
}
file = new File(file, dirs[dirs.length - 1]);//创建文件
return file;
} else {
if (!file.exists()) {//若目标路径的目录不存在，则创建
file.mkdirs();
try {
System.out.println("mkdirs: " + file.getCanonicalPath());
} catch (IOException e) {
e.printStackTrace();
}
}
file = new File(file, dirs[0]);//创建文件
return file;
}
}
/**
* 压缩文件
*
* @param dirPath 需要压缩的源文件路径
* @param outputPath 输出压缩文件的目标路径
* @param zipFileName 生成的压缩文件名
* @return 压缩后的文件路径包含文件名（例如： E:/test/test.zip）
*/
public static String compress(String dirPath, String outputPath, String zipFileName) {
File dir = new File(outputPath);
if (!dir.exists()) {
dir.mkdirs();
}
//添加文件的后缀名
zipFileName = outputPath + zipFileName + SUFFIX;
File dirFile = new File(dirPath);
List<File> fileList = getAllFile(dirFile);
byte[] buffer = new byte[BUFFER];
ZipEntry zipEntry = null;
//每次读取出来的长度
int readLength = 0;
try {
// 对输出文件做CRC32校验
CheckedOutputStream cos = new CheckedOutputStream(new FileOutputStream(zipFileName), new CRC32());
ZipOutputStream zos = new ZipOutputStream(cos);
for (File file : fileList) {
//若是文件，则压缩文件
if (file.isFile()) {
zipEntry = new ZipEntry(getRelativePath(dirPath, file));
zipEntry.setSize(file.length());
zipEntry.setTime(file.lastModified());
zos.putNextEntry(zipEntry);
InputStream is = new BufferedInputStream(new FileInputStream(file));
while ((readLength = is.read(buffer, 0, BUFFER)) != -1) {
zos.write(buffer, 0, readLength);
}
is.close();
System.out.println("file compress:" + file.getCanonicalPath());
} else {
//若是空目录，则写入zip条目中
zipEntry = new ZipEntry(getRelativePath(dirPath, file));
zos.putNextEntry(zipEntry);
System.out.println("dir compress: " + file.getCanonicalPath() + "/");
}
}
//最后得关闭流，不然压缩最后一个文件会出错
zos.close();
return zipFileName;
} catch (FileNotFoundException e) {
e.printStackTrace();
return "";
} catch (IOException e) {
e.printStackTrace();
return "";
}
}
/**
* 解压
*/
public static void decompress(String zipFileName, String destPath) {
try {
zipFileName = zipFileName + SUFFIX;
ZipInputStream zis = new ZipInputStream(new FileInputStream(zipFileName));
ZipEntry zipEntry = null;
//缓冲器
byte[] buffer = new byte[BUFFER];
//每次读出来的长度
int readLength = 0;
while ((zipEntry = zis.getNextEntry()) != null) {
//若是目录
if (zipEntry.isDirectory()) {
File file = new File(destPath + "/" + zipEntry.getName());
if (!file.exists()) {
file.mkdirs();
System.out.println("mkdirs:" + file.getCanonicalPath());
continue;
}
}
//若是文件
File file = createFile(destPath, zipEntry.getName());
System.out.println("file created: " + file.getCanonicalPath());
OutputStream os = new FileOutputStream(file);
while ((readLength = zis.read(buffer, 0, BUFFER)) != -1) {
os.write(buffer, 0, readLength);
}
os.close();
System.out.println("file uncompressed: " + file.getCanonicalPath());
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
String dirPath = "E:\\BaiduNetdiskDownload\\test2323\\";
String outputPath = "E:\\BaiduNetdiskDownload\\";
String zipFileName = new SimpleDateFormat("yyyyMMddHHmss").format(new Date());
compress(dirPath, outputPath, zipFileName);
}
}
🙏至此，非常感谢阅读🙏
