Java中的 Inflater inflate()函数及示例

Inflater 类的 inflate ()函数用于解压缩输入数据并用未压缩数据填充给定缓冲区。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)

句法：

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

参数：这些重载函数接受的各种参数有：

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

返回类型：该函数返回一个整数值，它是未压缩数据的大小。
异常：函数抛出DataFormatException，如果压缩数据格式无效

示例 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：

示例 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: Java/util/zip/Inflater.html#inflate(byte[])