Reader 和Writer对文件的简单操作

```java

import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Reader;
import java.io.Writer;

/*
 * 
 *  
 * 1.创建源
 * 2.选择流
 * 3.操作（写）
 * 4.释放资源
 */
public class IO_Test04 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		File srcFile = new File("io.txt");
		File desFile = new File("FileWriter.txt");
		Reader reader = null;
		Writer writer = null;
		try {
			reader = new FileReader(srcFile);
			writer = new FileWriter(desFile);
			int inputTemp = -1;
			char[] inputFlush = new char[1024];
			while ((inputTemp = reader.read(inputFlush)) != -1) {
				writer.write(inputFlush, 0, inputFlush.length);
			}
		} catch (Exception e) {
			// TODO: handle exception
		} finally {

			try {
				if (writer != null)
					writer.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			if (reader != null) {
				try {
					reader.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}

	}

}