Java Deflater setInput()用法及代码示例

java.util.zip中Deflater类的setInput()函数用于设置输入数据以进行压缩。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:

d.setInput(byte[]);
d.setInput(byte[], int, int);

参数：这些重载函数接受的各种参数是：

byte[] b：这是要放气的输入数组
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：该函数不返回任何内容。

异常：该函数不会引发任何异常

范例1：

// 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 
    { 
        // 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); 
  
        // compressed String 
        System.out.println("Compressed String:"
                           + new String(output) 
                           + "\n Size " + size); 
  
        // original String 
        System.out.println("Original String:" + text 
                           + "\n Size " + text.length()); 
  
        // end 
        d.end(); 
    } 
}

输出：

Compressed String:x?sOM?.N?/r???q??
 Size 21
Original String:GeeksforGeeksGeeksforGeeksGeeksforGeeksGeeksforGeeks
 Size 52

范例2：

// 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 
    { 
        // 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"), 10, 30); 
  
        // finish 
        d.finish(); 
  
        // output bytes 
        byte output[] = new byte[1024]; 
  
        // compress the data 
        int size = d.deflate(output); 
  
        // compressed String 
        System.out.println("Compressed String:"
                           + new String(output) 
                           + "\n Size " + size); 
  
        // end 
        d.end(); 
    } 
}

输出：

Compressed String:x?K?.vOM?.N?/????
 Size 22

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

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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 Deflater 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。