java.util.zip.CheckedOutputStream.getChecksum()

描述

java.util.zip.CheckedOutputStream.getChecksum() 方法返回此輸出流的校驗和。

宣告

以下是java.util.zip.CheckedOutputStream.getChecksum() 的宣告。

public Checksum getChecksum()

先決條件

在目錄D:> test > 中建立檔案 Hello.txt，其內容如下。

This is an example.

示例

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

package com.tutorialspoint;

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);
      }
   }
}

讓我們編譯並執行上述程式，它會生成以下結果 −

Zip file generated!
Adler32 Checksum is : 2416648244