java 读取txt文本内容工具类

package com.baojian.mob.util;

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

import org.apache.commons.lang.StringUtils;

/**
 * 
 * 功能：获取文本内容

 * 作者：张tt

 * 时间：2017年8月10日

 * 版本：1.0

 *
 */
public class ReadTxtUtil {
	
	public static StringBuilder readTxtFile(String filePath) throws IOException {
		if (StringUtils.isBlank(filePath)) {
			return null;
		}
		String encoding = "GBK";
		File file = new File(filePath);
		// 判断文件是否存在
		if (file.isFile() && file.exists() && file.canRead()) {
			StringBuilder result = new StringBuilder();
			FileInputStream fiStream = new FileInputStream(file);
			InputStreamReader inputStreamReader = new InputStreamReader(fiStream, encoding);
			BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
			String text = null;
			while ((text = bufferedReader.readLine()) != null) {// 使用readLine方法，一次读一行
				result.append(text + System.lineSeparator());
			}
			bufferedReader.close();
			inputStreamReader.close();
			fiStream.close();
			return result;
		}
		return null;
	}

     public static String readTxtFile(String filePath) { //优化读取txt工具，防止io阻塞 
	String content = null;
	try (Reader reader = new InputStreamReader(new FileInputStream(filePath), "GBK")) {
		StringBuffer sb = new StringBuffer();
		char[] tempchars = new char[1024];
		while (reader.read(tempchars) != -1) {
			sb.append(tempchars);
		}
		content = sb.toString();
	} catch (UnsupportedEncodingException e) {
		e.printStackTrace();
	} catch (FileNotFoundException e) {
		e.printStackTrace();
	} catch (IOException e) {
		e.printStackTrace();
	}
	return content;
      }