java 文件读取_InputStreamReader

package test;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
public class Test {
 public static void main(String arg[]) {
  String fileName = "E:\\share\\test.txt";
  String writeData = "HelloWorld!\r\nnihao我的内存是3G的 ";
  File file = new File(fileName);
  if (file.exists()) {
   file.delete();
  }
  char[] charInData = new char[50];
  int length = 0;
  try {
   file.createNewFile();
   OutputStreamWriter outWriter = new OutputStreamWriter(
     new FileOutputStream(file), "UTF-8");
   outWriter.write(writeData.toCharArray());
   outWriter.flush();
   outWriter.close();
   InputStreamReader inReader = new InputStreamReader(
     new FileInputStream(file), "UTF-8");
   while ((length = inReader.read(charInData)) != -1) {
    System.out.print(String.valueOf(charInData, 0, length));
   }
  } catch (IOException e) {
   System.out.println("IOException occur");
   e.getMessage();
  }
 }
}