java网络编程____简单的字符流操作(reader,writer)

package com.test.net.utils;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.InputStream;
import java.io.InputStreamReader;

/**
 * @author Administrator
 * 字符流操作
 */ 
public class CharStreamOper {
	public static void main(String[] args) throws Exception {
		//bufferReader
		InputStream in=new FileInputStream("test.txt");
		readStream(in);
		//filereader
		fileWriteOpe();
	}
	/**
	 * @throws Exception 
	 * @读取 request的流 ,ftp通道的流 等流信息
	 */
	public static String readStream(InputStream in) throws Exception{
		// 读取请求内容
		BufferedReader reader = new BufferedReader(new InputStreamReader(in, "UTF-8"));
		String line = null;
		StringBuilder sb = new StringBuilder();
		while ((line = reader.readLine()) != null) {
			sb.append(line);
		}
		System.out.println(sb.toString());
		return sb.toString();	
	}
	public static void fileWriteOpe() throws Exception {
		//写入文件
		FileWriter fileWriter = new FileWriter("test.txt");
		StringBuilder sbd = new StringBuilder();
		sbd.append("掌声那单点的的的的单点的\n");
		sbd.append("2掌声那放到飞凤舞法国恢复\n");
		sbd.append("3掌声那 撒旦法撒旦法是      旦法是掌声那 撒旦法撒旦法是      旦法是 掌声那 撒旦法撒旦法是      旦法是");
		fileWriter.write(sbd.toString());
		if (null != fileWriter) {
			fileWriter.close();
		}
		System.out.print("写入成功....\n");
		// 读取写入的文件
		FileReader fileReader = new FileReader("test.txt");
		int len;
		StringBuilder sbReader = new StringBuilder();
		while ((len = fileReader.read()) != -1) {
			sbReader.append((char)len);
		}
		System.out.println("读取文件_______:\n"+sbReader);
	}
}

//