JAVA读取矩阵文件,写入矩阵

JAVA读取矩阵文件,矩阵数据的文件格式为.bak,或grd,矩阵数据交换

1package com.gsafety.weixin.utils;
2
3import java.io.BufferedReader;
4import java.io.BufferedWriter;
5import java.io.File;
6import java.io.FileInputStream;
7import java.io.FileOutputStream;
8import java.io.IOException;
9import java.io.InputStreamReader;
10import java.io.OutputStreamWriter;
11
12public class MatrixUtils {
13    public static void main(String[] args) {
14        String[][] arrs =new String[120][120];
15        String[][] retArr=new String[120][120];
16    
17        try {
18            File file =new File("E:\\test.bak");
19            InputStreamReader is=new InputStreamReader(new FileInputStream(file));
20            BufferedReader br =new BufferedReader(is);
21            String line="";
22            int n=0;
23            while((line=br.readLine())!=null){
24                String [] retline=line.split("\\s+");
25                arrs[n] = retline;
26                n++;
27            }
28            
29            //实现矩阵上下对折
30            for (int i = 0; i < retArr.length; i++) {
31                for (int j = 0; j < retArr[i].length; j++) {
32                    retArr[arrs.length-i-1][j]=arrs[i][j];
33                }
34            }
35            File wfile =new File("E:\\test2.bak");
36            OutputStreamWriter os=new OutputStreamWriter(new FileOutputStream(wfile));
37            BufferedWriter bw =new BufferedWriter(os);
38            for (int m = 0; m < retArr.length; m++) {
39                StringBuilder sb=new StringBuilder();
40                for (String str : retArr[m]) {
41                    sb.append(str+" ");
42                    
43                }
44                bw.write(sb.toString());
45                bw.newLine();
46            }
47            bw.flush();
48            bw.close();
49            br.close();
50        } catch (IOException e) {
51            // TODO Auto-generated catch block
52            e.printStackTrace();
53        }
54        
55    }
56
57}