package org.nhooo.example.zip;
import java.io.*;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipEntry;
import java.util.zip.CheckedInputStream;
import java.util.zip.Adler32;
public class UnzipWithChecksum {
public static void main(String[] args) throws Exception {
String zipName = "data-1.zip";
try (FileInputStream fis = new FileInputStream(zipName);
//创建输入流，该输入流还保持以下项的校验和
//以后可以用来验证数据的数据
//诚信
CheckedInputStream checksum =
new CheckedInputStream(fis, new Adler32());
ZipInputStream zis =
new ZipInputStream(new BufferedInputStream(checksum))) {
ZipEntry entry;
//从ZipInputStream读取每个条目，直到没有更多条目为止
//找到，由getNextEntry()的空返回值指示
//方法。
while ((entry = zis.getNextEntry()) != null) {
System.out.println("Unzipping: " + entry.getName());
int size;
byte[] buffer = new byte[1048];
try (FileOutputStream fos =
new FileOutputStream(entry.getName());
BufferedOutputStream bos =
new BufferedOutputStream(fos, buffer.length)) {
while ((size = zis.read(buffer, 0, buffer.length)) != -1) {
bos.write(buffer, 0, size);
}
bos.flush();
}
}
//打印校验和值
long value = checksum.getChecksum().getValue();
System.out.println("Checksum = " + value);
}
}
}
