package com.ghca.policeintf.test; import java.io.FileInputStream; import java.io.IOException; /** * Created by DUDU on 2017/11/2. */ public class ReadFile2ByteArrayTest { public static void main(String[] args) throws IOException { FileInputStream fis = new FileInputStream("D:\\32-bit system ported file\\1`.rar"); byte[] buffer = new byte[1024]; int totalReadCount = 0; while(true) { int remaining = buffer.length - totalReadCount; // if (remaining > 0) { // int currentReadCount = fis.read(buffer,totalReadCount,remaining); // if (currentReadCount > 0) { // totalReadCount = totalReadCount + currentReadCount; // } else { // break; // } // } else {//Expand buffer // byte[] newBuffer = new byte[buffer.length * 2]; // System.arraycopy(buffer,0,newBuffer,0,totalReadCount); // buffer = newBuffer; // } if (remaining <= 0) {//Expand the buffer first byte[] newBuffer = new byte[buffer.length * 2]; System.arraycopy(buffer,0,newBuffer,0,buffer.length); buffer = newBuffer; // remaining = buffer.length - totalReadCount; continue; } int currentReadCount = fis.read(buffer,totalReadCount,remaining); if (currentReadCount > 0) { totalReadCount = totalReadCount + currentReadCount; } else { break; } } System.out.println("Total number of bytes read:" + totalReadCount); System.out.println("buffer大小:" + buffer.length); } }
ReadFile2ByteArrayTest
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