java读写文件（txt）

package com.sh.tool; import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.InputStreamReader; import java.util.regex.Matcher; import java.util.regex.Pattern; /** * 读取文件内容 * ClassName: ReadTxtFile * @Description: TODO * @author micoMo * @date 2017-8-21 */ public class ReadTxtFile { public static String readTxtFile(String filePath){ String txtStr = "";//存储文件内容 try { File file=new File(filePath); if(file.isFile() && file.exists()){ InputStreamReader isr = new InputStreamReader(new FileInputStream(file),"GBK"); BufferedReader br = new BufferedReader(isr); String line = null; StringBuffer bf = new StringBuffer(); //逐行读取文件内容 while((line = br.readLine()) != null){ //正则表达式匹配手机号 if(line.length()>0){ Pattern pattern = Pattern.compile("(1|861)(3|5|7|8)\\d{9}$*"); Matcher matcher = pattern.matcher(line); while (matcher.find()) { //拼接获取的手机号 bf.append(matcher.group()).append("\n"); } } } txtStr = bf.toString().replaceAll("((\r\n)|\n)[\\s\t ]*(\\1)+", "$1");//去掉多余的空行 isr.close(); } else { System.out.println("没有找到该文件"); } } catch (Exception e) { e.printStackTrace(); } finally { } return txtStr; } }