java实现读取txt文件并以在每行以空格取数据

Z时代
2024-01-10
分类：综合

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>();
  /* 读取数据 */
  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);
  }
  /* 输出数据 */
  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);
  }
 }
}