用java从文件中读取二维数组 java读取txt文件然后赋值二维数组

import java.io.File;import java.io.FileNotFoundException;import java.util.Arrays;import java.util.Scanner;public class Test6{public static int[][] save(String fileName){int[][] les = null;try{Scanner scanner = new Scanner(new File(fileName));int i = 0;while(scanner.hasNextLine()){String line = scanner.nextLine().trim();if(i == 0){int num = Integer.parseInt(line);les = new int[num][num];}else{for(int j = 0; j < line.length(); j++){les[i - 1][j] = Integer.parseInt(line.charAt(j) + "");}}i++;}scanner.close();return les;}catch(FileNotFoundException e){e.printStackTrace();}return null;}public static void main(String[] args){int[][] LES = save("les.txt");System.out.println(Arrays.deepToString(LES));}}

java\u8bfb\u53d6txt\u6587\u4ef6\u7136\u540e\u8d4b\u503c\u4e8c\u7ef4\u6570\u7ec4\u5b9e\u73b0\u65b9\u6cd5\u5982\u4e0b\uff1a
package shi; import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.InputStreamReader;import java.util.ArrayList;import java.util.List; public class Test13 { /** * \u8bfb\u53d6\u6587\u4ef6 * @param filePath * @return */ public static List readTxtFile(String filePath) { List list = new ArrayList(); try { String encoding = "UTF-8"; File file = new File(filePath); if (file.isFile() && file.exists()) { InputStreamReader read = new InputStreamReader( new FileInputStream(file), encoding); BufferedReader bufferedReader = new BufferedReader(read); String lineTxt = null; while ((lineTxt = bufferedReader.readLine()) != null) { if (!lineTxt.startsWith("#")) list.add(lineTxt); } read.close(); } else { System.out.println("\u627e\u4e0d\u5230\u6587\u4ef6"); } } catch (Exception e) { System.out.println("\u51fa\u9519\u4e86"); e.printStackTrace(); } return list; } /** * \u521b\u5efa\u4e8c\u7ef4\u6570\u7ec4 * @param list * @return */ public static String[][] createArray(String filePath){ List list = readTxtFile(filePath); String array[][] = new String[list.size()][]; for(int i=0;i<list.size();i++){ array[i] = new String[3]; String linetxt=list.get(i); String[] myArray = linetxt.replaceAll("\\s+", "@").split("@"); for(int j=0;j<myArray.length;j++){ if(j<3){ array[i][j]=myArray[j]; } } } return array; } /** * \u6253\u5370\u6570\u7ec4 * @param array */ public static void printArray(String array[][]){ for(int i=0;i<array.length;i++){ for(int j=0;j<array[i].length;j++){ if(j!=array[i].length-1){ System.out.print("array["+i+"]["+j+"]="+array[i][j]+","); } else{ System.out.print("array["+i+"]["+j+"]="+array[i][j]); } } System.out.println(); } } public static void main(String args[]) { String array[][] = createArray("F:\\test1.txt"); printArray(array); } }

在src下面建立xiaojiba.txt  把数据复制进去。

File f=new File("文件路径");
//通过流读入文件
InputStream in=new BufferedInputStream(file.getInputstream());
String s=convertStreamToString(in);
//然后把S拼接数组，代码省略，别说你还不会

//方法   流转换为String
 public String convertStreamToString(InputStream is) {    
         BufferedReader reader = new BufferedReader(new InputStreamReader(is));    
         StringBuilder sb = new StringBuilder();    
   
         String line = null;    
        try {    
            while ((line = reader.readLine()) != null) {    
                 sb.append(line + "
");    
             }    
         } catch (IOException e) {    
             e.printStackTrace();    
         } finally {    
            try {    
                 is.close();    
             } catch (IOException e) {    
                 e.printStackTrace();    
             }    
         }    
   
        return sb.toString();    
     }    
}