Java Inflater setInput()用法及代码示例

Inflater类的setInput()函数用于设置输入数据以进行不压缩。当needsInput()返回true指示输入缓冲区为空时，应调用此函数。

函数签名：

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

用法:

i.setInput(byte[]);
i.setInput(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：该函数没有返回值

异常：该函数不会引发任何异常

范例1：使用setInput(byte [] b)函数

// Java program to describe the use 
// of setInput(byte[] b) 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setInput(byte [] b，int offset，int len)函数

// Java program to describe the use 
// of setInput(byte[] b, int offset, int len) 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 the compression 
  
        // use Inflater to get back the original data 
  
        // Inflater 
        Inflater i = new Inflater(); 
  
        // set the input for inflator 
        i.setInput(output, 0, 14); 
  
        // 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：

参考： https://docs.oracle.com/javase/7/docs/api/java/util/zip/Inflater.html#setInput()

相关用法

注：本文由纯净天空筛选整理自andrew1234大神的英文原创作品 Inflater setInput() 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。