读文件，报java.lang.OutOfMemoryError

import java.io.*;



public class FileToString {

	 public static String readFile(String fileName) {

		String output = ""; 

		

	    File file = new File(fileName);

	       

	    if(file.exists()){

	    	if(file.isFile()){

	    		try{

	    			BufferedReader input = new BufferedReader (new FileReader(file));

	    			StringBuffer buffer = new StringBuffer();

	    			String text;								//问题出在这2行，如果我这么写的话，就会报那个错误。

	    			   											//String text = input.readLine();

	    			while((text = input.readLine()) != null)	//while(text != null)

	    				buffer.append(text +"\n");

	    			   

	    			output = buffer.toString();	    			   

	    		}

	    		catch(IOException ioException){

	    			System.err.println("File Error!");



	    		}

	    	}

	    	else if(file.isDirectory()){

	    		String[] dir = file.list();

	    		output += "Directory contents:\n";

	    		

	    		for(int i=0; i<dir.length; i++){

	    			output += dir[i] +"\n";

	    		}

	    	}

	    }

	    else{

	    	System.err.println("Does not exist!");

	    }

	    return output;

	 }

	 

	 public static void main (String args[]){

		 String  str = readFile("C:/1.txt");

		 

		 System.out.print(str);

	 }

}

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