java读取txt文件

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

public class FileUtil {
	
	// 使用文件流可设置编码格式
	private FileInputStream file;
	
	/**
	 * 根据文件路径读取文件
	 * @param path
	 */
	public FileUtil(String path){
		try {
			file = new FileInputStream(path);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}
	}
	
	/**
	 * 读取流中的文件数据
	 * @return
	 */
	private String readTxtFile(){
		// 非线程安全类，建议多线程中用StringBuffer
		StringBuilder result = new StringBuilder();
		// 创建字符读取流
		BufferedReader br = null;
		InputStreamReader in = null;
		try {
			// 设置编码格式为GBK，防治中文乱码
			in = new InputStreamReader(file,"GBK");
			br = new BufferedReader(in);
			String s = null;
			boolean firstLine = true;
			while((s = br.readLine()) != null){
				if(firstLine){
					firstLine = false;
				}else {
					result.append("\n");
				}
				result.append(s);
			}
			return result.toString();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
			return "file FileNotFound error!";
		} catch (IOException e) {
			e.printStackTrace();
			return "file read error!";
		}finally{
			try {
				if(null != br){
					// 关闭输入流
					br.close();
				}
				if(null != in){
					in.close();
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}
	
	public static void main(String[] args) throws IOException {
		FileUtil fileUtil = new FileUtil("D:\\.m2\\fileTest.txt");
		System.out.println(fileUtil.readTxtFile());
		fileUtil.file.close();
	}

}