Java Inflater inflate()用法及代码示例

Inflater类的inflate()函数用于解压缩输入数据，并使用未压缩的数据填充给定的缓冲区。该函数返回未压缩数据的字节数。

函数签名：

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

用法:

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

参数：这些重载函数接受的各种参数是：

byte[] b：这是要膨胀的输入数组
int offset：这是要从给定数组中读取值的起始偏移量
int length：这是从起始偏移量开始压缩的最大长度。

返回类型：该函数返回一个整数值，该值是未压缩数据的大小。异常：如果压缩数据格式无效，该函数将引发DataFormatException

范例1：使用inflate(byte [] b)函数

// 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(); 
    } 
}

输出：

范例2：使用inflate(byte [] b，int offset，int length)函数

// 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(); 
    } 
}

输出：

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

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注：本文由纯净天空筛选整理自andrew1234大神的英文原创作品 Inflater inflate() function in Java with examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。