java IO总结之字符流操作文件读写（高效）

package com.java;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class IOTest6 {

	/**
	 * 字符流操作文件读写(高效)
	 */
	public static void main(String[] args) {
		BufferedReader br = null;
		BufferedWriter bw = null;
		try {
			br = new BufferedReader(new FileReader("from.txt"));
			bw = new BufferedWriter(new FileWriter("to.txt"));
			// 单个字符的循环输入输出
			oneWordIO(br, bw);
			// 一行一行循环输入输出
			oneLineIO(br, bw);
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				bw.close();
				br.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}

	}

	/**
	 * 一行一行循环输入输出
	 */
	private static void oneLineIO(BufferedReader in, BufferedWriter out)
			throws IOException {
		String str = null;
		while ((str = in.readLine()) != null) {
			out.write(str, 0, str.length());
			out.newLine();
			out.flush();
		}
	}

	/**
	 * 单个字符的输入整行输出
	 */
	private static void oneWordIO(BufferedReader in, BufferedWriter out)
			throws IOException {
		int ch = -1;
		while ((ch = in.read()) != -1) {
			out.write(ch);
			out.flush();
		}
	}

}