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今帮一朋友做了个读取txt文件的代码，掌握不扎实啊，写这些还要多次查api帮助文档，呵呵呵

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;

public class Test
{
public String readFile(String file)
{
   String doc = null;
   StringBuffer fileText = new StringBuffer();
   FileInputStream infile;
   try {
    infile = new FileInputStream(file);

    InputStreamReader in = new InputStreamReader(infile);
    java.io.BufferedReader reader =new java.io.BufferedReader(in);
    while((doc=reader.readLine()) !=null)
    {
     if(!doc.equals("") && !doc.substring(0,1).equals("#"))
      fileText.append(doc+"\n");
    }

   } catch (FileNotFoundException e) {
    e.printStackTrace();
   }catch(IOException ie)
   {
    ie.printStackTrace();
   }
   return fileText.toString();
}
public static void main(String[] args)
{
   String fileText = new Test().readFile("C://1.txt");
   System.out.println("fileText:\n");
   System.out.println(fileText);
}
}

1.txt文件

#Line1
J2SE
#cOMMENTS
J2EE

J2ME

输出

J2SE
J2EE

J2ME