java.util.zip.Inflater.setInput(byte[] b, int off, int len)方法範例

java.util.zip.Inflater.setInput(byte[] b, int off, int len)方法設定用於解壓縮的輸入資料。 每當呼叫needsInput()返回true時，表示需要更多輸入資料。

宣告

以下是java.util.zip.Inflater.setInput(byte[] b, int off, int len)方法的宣告。

public void setInput(byte[] b, int off, int len)

引數

• b - 字典資料位元組。
• off - 資料的起始偏移量。
• len - 資料的長度。

返回值

• N/A

異常

• N/A

範例

以下範例顯示了java.util.zip.Inflater.setInput(byte[] b, int off, int len)方法的用法。

package com.yiibai;

import java.io.UnsupportedEncodingException;
import java.util.zip.DataFormatException;
import java.util.zip.Deflater;
import java.util.zip.Inflater;

public class InflaterDemo {
   public static void main(String[] args) 
      throws DataFormatException, UnsupportedEncodingException {
      String message = "Welcome to Tw511.com;"
         +"Welcome to Tw511.com;"
         +"Welcome to Tw511.com;"
         +"Welcome to Tw511.com;"
         +"Welcome to Tw511.com;"
         +"Welcome to Tw511.com;"
         +"Welcome to Tw511.com;"
         +"Welcome to Tw511.com;"
         +"Welcome to Tw511.com;"
         +"Welcome to Tw511.com;";
      System.out.println("Original Message length : " + message.length());
      byte[] input = message.getBytes("UTF-8");

      // Compress the bytes
      byte[] output = new byte[1024];
      Deflater deflater = new Deflater();
      deflater.setInput(input);
      deflater.finish();
      int compressedDataLength = deflater.deflate(output,0,output.length);
      deflater.end();

      System.out.println("Compressed Message length : " + compressedDataLength);

      // Decompress the bytes
      Inflater inflater = new Inflater();
      inflater.setInput(output, 0, 10);
      byte[] result = new byte[1024];
      int resultLength = inflater.inflate(result, 0 , 10);

      if(inflater.needsInput()){
         inflater.setInput(output, 10, compressedDataLength - resultLength);    
         resultLength += 
            inflater.inflate(result, resultLength , result.length - resultLength);
      }

      inflater.end();

      // Decode the bytes into a String
      message = new String(result, 0, resultLength, "UTF-8");

      System.out.println("UnCompressed Message length : " + message.length());
   }
}

執行上面範例程式碼，得到以下結果 -

Original Message length : 300
Compressed Message length : 42
UnCompressed Message length : 300