简单一个例子。其中正则是取消多余空格或者tab键

package test4; import java.io.BufferedReader;import java.io.FileReader;import java.io.IOException; public class ExplaceSql { public static void main(String[] args) { String filePath = ExplaceSql.class.getResource("").getPath()+"aaa.txt"; // 文件路径 read(filePath); } /** * 读取内容 */ public static String read(String filePath){ BufferedReader br = null; String line =null; //StringBuffer buf = new StringBuffer(); try { //根据文件路径创建缓冲输入流 br = new BufferedReader(new FileReader(filePath));//filePath中是aaa.txt文件 String str = ""; //循环读取文件的每一行，对需要修改的行进行修改，放入缓冲对象中 while ((line = br.readLine()) != null) { //设置正则将多余空格都转为一个空格 str=line+"\r\n"; String[] dictionary = str.split("\\s{2,}|\t"); for(int i=0;i<dictionary.length;i++){ str = "insert into tablename values("+ dictionary[0]+",'"+dictionary[1]+"',"+dictionary[2]+"')"; } System.out.println(str); } } catch (Exception e) { e.printStackTrace(); }finally { if (br != null) {// 关闭流 try { br.close(); } catch (IOException e) { br = null; } } } return null; } }

java逐行读写txt文件

package help; import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.InputStreamReader;import java.io.OutputStreamWriter;import java.util.HashMap;import java.util.Map; public class TXTParseUtils { private static final Integer ONE = 1; public static void main(String[] args) { Map<String, Integer> map = new HashMap<String, Integer>(); try { BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(new File("D:/报销.txt")), "UTF-8")); String lineTxt = null; while ((lineTxt = br.readLine()) != null) { String[] names = lineTxt.split(","); for (String name : names) { if (map.keySet().contains(name)) { map.put(name, (map.get(name) + ONE)); } else { map.put(name, ONE); } } } br.close(); } catch (Exception e) { System.err.println("read errors :" + e); } try { BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(new File("D:/结果.txt")), "UTF-8")); for (String name : map.keySet()) { bw.write(name + " " + map.get(name)); bw.newLine(); } bw.close(); } catch (Exception e) { System.err.println("write errors :" + e); } }}

以上这篇java实现读取txt文件并以在每行以空格取数据就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。