Checksum getChecksum()

描述 (Description)

java.util.zip.CheckedOutputStream.getChecksum()方法返回此输出流的校验和。

声明 (Declaration)

以下是java.util.zip.CheckedOutputStream.getChecksum()方法的声明。

public Checksum getChecksum()

先决条件

在D:》 test 》目录中创建一个文件Hello.txt，其中包含以下内容。

This is an example.

例子 (Example)

以下示例显示了java.util.zip.CheckedOutputStream.getChecksum（）方法的用法。

package cn.xnip;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.Adler32;
import java.util.zip.CheckedOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
public class CheckedOutputStreamDemo {
   private static String SOURCE_FILE = "D:\\test\\Hello.txt";
   private static String TARGET_FILE = "D:\\test\\Hello.zip";
   public static void main(String[] args) {
      byte[] buffer = new byte[1024];
      try {
         FileOutputStream fout = new FileOutputStream(TARGET_FILE);
         CheckedOutputStream checksum = new CheckedOutputStream(fout, new Adler32());
         ZipOutputStream zout = new ZipOutputStream(checksum);
         FileInputStream fin = new FileInputStream(SOURCE_FILE);
         zout.putNextEntry(new ZipEntry(SOURCE_FILE));
         int length;
         while((length = fin.read(buffer)) > 0) {
            zout.write(buffer, 0, length);
         }
         zout.closeEntry();
         fin.close();
         zout.close();
         System.out.println("Zip file generated!");
         System.out.println("Adler32 Checksum is : " + checksum.getChecksum().getValue());
      } catch(IOException ioe) {
         System.out.println("IOException : " + ioe);
      }
   }
}

让我们编译并运行上面的程序，这将产生以下结果 -

Zip file generated!
Adler32 Checksum is : 2416648244