簡單一個例子。其中正則是取消多余空格或者tab鍵
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"; // 文件路徑 read(filePath); } /** * 讀取內容 */ public static String read(String filePath){ BufferedReader br = null; String line =null; //StringBuffer buf = new StringBuffer(); try { //根據文件路徑創建緩沖輸入流 br = new BufferedReader(new FileReader(filePath));//filePath中是aaa.txt文件 String str = ""; //循環讀取文件的每一行,對需要修改的行進行修改,放入緩沖對象中 while ((line = br.readLine()) != null) { //設置正則將多余空格都轉為一個空格 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) {// 關閉流 try { br.close(); } catch (IOException e) { br = null; } } } return null; } }
java逐行讀寫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>(); /* 讀取數據 */ try { BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(new File("D:/報銷.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); } /* 輸出數據 */ try { BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(new File("D:/結果.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); } }}
以上這篇java實現讀取txt文件并以在每行以空格取數據就是小編分享給大家的全部內容了,希望能給大家一個參考,也希望大家多多支持VeVb武林網。
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