testfileinputstream.java

来自「一个很好的Java函数实例」· Java 代码 · 共 34 行

package apibook.c3.s5;

import java.io.*;

//测试FileInputStream类
public class TestFileInputStream {
  public TestFileInputStream() {
  }

  public static void main(String[] args) {
    try {
      String infile = "TestFileInputStream.in";
      String outfile = "TestFileInputStream.txt";
      File f = new File(infile);
      FileInputStream in = new FileInputStream(f);
      FileOutputStream out = new FileOutputStream(outfile);

      long size = f.length();//得到文件长读
      in.skip(size/2);//设置跳过文件长度的一半

      byte[] buf = new byte[512];
      int count;
      while ((count = in.read(buf)) > 0) {//从输入文件读数据
        out.write(buf, 0, count);//将数据写入输出文件
      }
      in.close();//关闭输入文件
      out.close();//关闭输出文件
    } catch (FileNotFoundException e) {
      System.err.println("File is not found");
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}