簡單一個例子。其中正則是取消多余空格或者tab鍵
java" id="highlighter_94157">
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package test4; import java.io.bufferedreader;import java.io.filereader;import java.io.ioexception; public class explacesql { public static void main(string[] args) { 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
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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服務器之家。
原文鏈接：https://blog.csdn.net/shunzi1046/article/details/54928238
