[Java SE] JAVA.IO 相关--第二篇（读取TXT）

上篇说道不用File，而是用getResourceAsStream（）来读取文件

 

下面是一个在res资源文件夹下读取某一resource.txt文件的DEMO

 

 

package com.japher.j2se.InputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

/**
 * 
 * @author liujie,[e-mail]
 *
 */
public class TestInputStream 
{
	public static void main(String [] art)
	{
		InputStream in  = Reader.getInstance().getResourceAsStream("/resource.txt");
		
		if(in == null)
			throw new RuntimeException("read error");
		
		try {
			System.out.println(Reader.asString(in));
		} catch (IOException e) {
			e.printStackTrace();
		}
		
	}
}


class Reader
{
	private static Reader instance;
	
	/*保持单例*/
	public static Reader getInstance()
	{
		if(instance == null)
			instance = new Reader();
		return instance;
	}
	
	/*读取为InputStream*/
	public synchronized InputStream getResourceAsStream(String path)
	{
		return this.getClass().getResourceAsStream(path);
	}
	
	/*将InputStream转换为String*/
	public static String asString(InputStream in) throws IOException
	{
		BufferedReader br = new BufferedReader(new InputStreamReader(in, "UTF-8"));
        StringBuffer buf = new StringBuffer();
        String line;
        while (null != (line = br.readLine())) {
            buf.append(line).append("\n");
        }
        return buf.toString();
	}
}