今天通过Java实现一下：文件的压缩和解压缩。
1. 压缩
准备文件：
准备代码：（压缩）
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream; public class CompressUtils { public static void main(String[] args) {
//需要压缩的文件路径
List<String> filePathList = new ArrayList<>();
filePathList.add("src\\demo\\knowledgepoints\\compress\\filezip\\1.docx");
filePathList.add("src\\demo\\knowledgepoints\\compress\\filezip\\1.pdf"); //压缩后的文件路径
String zipPath = "src/demo/knowledgepoints/compress/filezip/1.zip";
toZip(filePathList,zipPath);
} /**
* 压缩文件
* @param filePathList
* @param zipPath
* @throws RuntimeException
*/
public static void toZip(List<String> filePathList,String zipPath) throws RuntimeException {
List<File> adjustFiles = new ArrayList<>();
for (String filePath :filePathList){
adjustFiles.add(new File(filePath));
} ByteArrayOutputStream fos2 = new ByteArrayOutputStream();
CompressUtils.toZip(adjustFiles, fos2); BufferedOutputStream output = null;
BufferedInputStream bis = null;
FileOutputStream fos = null;
byte[] fileBytes = fos2.toByteArray();
try {
ByteArrayInputStream byteInputStream = new ByteArrayInputStream(fileBytes); bis = new BufferedInputStream(byteInputStream);
File file = new File(zipPath);
file.createNewFile(); fos = new FileOutputStream(file);
// 实例化OutputString 对象
output = new BufferedOutputStream(fos);
byte[] buffer = new byte[1024];
int length = bis.read(buffer);
while (length != -1) {
output.write(buffer, 0, length);
length = bis.read(buffer);
}
output.flush();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (bis != null) {
bis.close();
}
if (fos != null) {
fos.close();
}
if (output != null) {
output.close();
}
} catch (IOException e0) {
e0.printStackTrace();
}
}
} /**
* 压缩成ZIP
* @param srcFiles 需要压缩的文件列表
* @param out 压缩文件输出流
* @throws RuntimeException 压缩失败会抛出运行时异常
*/
public static void toZip(List<File> srcFiles, OutputStream out) throws RuntimeException {
long start = System.currentTimeMillis();
ZipOutputStream zos = null;
try {
zos = new ZipOutputStream(out);
for (File srcFile : srcFiles) {
byte[] buf = new byte[1024];
zos.putNextEntry(new ZipEntry(srcFile.getName()));
int len;
FileInputStream in = new FileInputStream(srcFile);
while ((len = in.read(buf)) != -1) {
zos.write(buf, 0, len);
}
zos.closeEntry();
in.close();
}
long end = System.currentTimeMillis();
System.out.println("压缩完成，耗时：" + (end - start) + " ms");
} catch (Exception e) {
throw new RuntimeException("zip error from ZipUtils", e);
} finally {
if (zos != null) {
try {
zos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
运行效果：
1. 解压缩
将刚刚压缩的文件放到新的路径下：
准备代码：（解压缩）
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream; public class CompressUtils { public static void main(String[] args) {
String zipPath = "src\\demo\\knowledgepoints\\compress\\file\\1.zip";
String filePath = "src\\demo\\knowledgepoints\\compress\\file";
zipToFile(zipPath,filePath);
} /**
* zip解压过程
* @param zipPath 压缩文件路径
* @param filePath 解压后文件夹路径
* @throws RuntimeException
*/
public static void zipToFile(String zipPath, String filePath) throws RuntimeException {
long startTime = System.currentTimeMillis(); BufferedInputStream Bin = null; //数据源缓存流
ZipInputStream Zin = null; //数据源
FileOutputStream out = null; //输出流
BufferedOutputStream Bout = null; //输出缓存流
try {
Zin = new ZipInputStream(new FileInputStream(zipPath));//输入源zip路径
Bin = new BufferedInputStream(Zin);
File Fout;
ZipEntry entry;
while ((entry = Zin.getNextEntry()) != null && !entry.isDirectory()) {
Fout = new File(filePath, entry.getName());
if (!Fout.exists()) {
new File(Fout.getParent()).mkdirs();
}
out = new FileOutputStream(Fout);
Bout = new BufferedOutputStream(out);
int bytes;
while ((bytes = Bin.read()) != -1) {
Bout.write(bytes);
}
System.out.println(Fout + "解压成功");
}
long endTime = System.currentTimeMillis();
System.out.println("耗费时间： " + (endTime - startTime) + " ms");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
try {
if (Bin != null) {
Bin.close();
}
if (Zin != null) {
Zin.close();
}
if (Bout != null) {
Bout.close();
}
if (out != null) {
out.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
运行结果：