Java Inflater inflate()用法及代碼示例

Inflater類的inflate()函數用於解壓縮輸入數據，並使用未壓縮的數據填充給定的緩衝區。該函數返回未壓縮數據的字節數。

函數簽名：

public int inflate(byte[] b)
public int inflate(byte[] b, int offset, int length)

用法:

i.inflate(byte[])
i.inflate(byte[], int, int )

參數：這些重載函數接受的各種參數是：

byte[] b：這是要膨脹的輸入數組
int offset：這是要從給定數組中讀取值的起始偏移量
int length：這是從起始偏移量開始壓縮的最大長度。

返回類型：該函數返回一個整數值，該值是未壓縮數據的大小。異常：如果壓縮數據格式無效，該函數將引發DataFormatException

範例1：使用inflate(byte [] b)函數

// Java program to describe the use 
// of inflate function 
  
import java.util.zip.*; 
import java.io.UnsupportedEncodingException; 
  
class GFG { 
    public static void main(String args[]) 
        throws UnsupportedEncodingException, 
               DataFormatException 
    { 
  
        // compress the data 
  
        // deflater 
        Deflater d = new Deflater(); 
  
        // get the text 
        String pattern = "GeeksforGeeks", text = ""; 
  
        // generate the text 
        for (int i = 0; i < 4; i++) 
            text += pattern; 
  
        // set the input for deflator 
        d.setInput(text.getBytes("UTF-8")); 
  
        // finish 
        d.finish(); 
  
        // output bytes 
        byte output[] = new byte[1024]; 
  
        // compress the data 
        int size = d.deflate(output); 
  
        // end 
        d.end(); 
  
        // end of compression 
  
        // use Inflater to get back the original data 
  
        // Inflater 
        Inflater i = new Inflater(); 
  
        // set the input for inflator 
        i.setInput(output); 
  
        // output bytes 
        byte inflater_output[] = new byte[1024]; 
  
        // uncompress the data 
        int org_size = i.inflate(inflater_output); 
  
        // output of inflater and deflater 
        System.out.println("Compressed output of deflater:"
                           + new String(output)); 
        System.out.println("Compressed output of Inflater:"
                           + new String(inflater_output, "UTF-8")); 
  
        // end 
        i.end(); 
    } 
}

輸出：

範例2：使用inflate(byte [] b，int offset，int length)函數

// Java program to describe the use 
// of inflate function 
  
import java.util.zip.*; 
import java.io.UnsupportedEncodingException; 
  
class GFG { 
    public static void main(String args[]) 
        throws UnsupportedEncodingException, 
               DataFormatException 
    { 
  
        // compress the data 
  
        // deflater 
        Deflater d = new Deflater(); 
  
        // get the text 
        String pattern = "GeeksforGeeks", text = ""; 
  
        // generate the text 
        for (int i = 0; i < 4; i++) 
            text += pattern; 
  
        // set the input for deflator 
        d.setInput(text.getBytes("UTF-8")); 
  
        // finish 
        d.finish(); 
  
        // output bytes 
        byte output[] = new byte[1024]; 
  
        // compress the data 
        int size = d.deflate(output); 
  
        // end 
        d.end(); 
  
        // end of compression 
  
        // use Inflater to get back the original data 
  
        // Inflater 
        Inflater i = new Inflater(); 
  
        // set the input for inflator 
        i.setInput(output); 
  
        // output bytes 
        byte inflater_output[] = new byte[1024]; 
  
        // uncompress the data 
        int org_size = i.inflate(inflater_output, 0, 15); 
  
        // output of inflater and deflater 
        System.out.println("Compressed output of deflater:"
                           + new String(output)); 
        System.out.println("Compressed output of Inflater:"
                           + new String(inflater_output, "UTF-8")); 
  
        // end 
        i.end(); 
    } 
}

輸出：

參考： https://docs.oracle.com/javase/7/docs/api/java/util/zip/Inflater.html#inflate(byte[])

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注：本文由純淨天空篩選整理自andrew1234大神的英文原創作品 Inflater inflate() function in Java with examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。