testinputstreamreader.java

来自「一个很好的Java函数实例」· Java 代码 · 共 50 行

package apibook.c3.s2;

import java.io.*;

//测试InputStreamReader类
public class TestInputStreamReader {
  public TestInputStreamReader(InputStreamReader in) {
    try {
      if (in.ready())//检查流是否准备好
        System.out.println("Reader is ready!");
      else
        System.out.println("Reader isn't ready!");
      System.out.println("encoding:"+ in.getEncoding());
      System.out.println("execute read():" + (char)in.read());//读取第一个字符
      if (in.markSupported())//查询是否支持mark和reset方法
      {
        in.mark(5);
        System.out.println("this input stream support mark");
      }
      else
        System.out.println("this input stream doesn't support mark");

      char[] inbuf = new char[10];
      int readsize = in.read(inbuf, 0, 10);//读取一个字节数组
      System.out.println("read number:" + readsize);
      System.out.println("read content:" + new String(inbuf));
      if (in.markSupported())
        in.reset();
      readsize = in.read(inbuf, 0, 10);//如果支持reset，对比结果
      System.out.println("read again number:" + readsize);
      System.out.println("read again content:" + new String(inbuf));

      in.close();//关闭
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
  public static void main(String[] args) {
    try {
      String filename = "TestInputStreamReader.txt";//设定输入数据流文件
      TestInputStreamReader testInputStreamReader1 =
          new TestInputStreamReader(new InputStreamReader(new FileInputStream(filename), "UTF8"));
      //打开测试文件
    }
    catch (IOException e) {
        e.printStackTrace();
    }
  }

}