0

在读取decodeData(strLine)中的文本文件时，它仅读取文件夹中的最后两个文本文件，并从第一个文本文件的某些部分（最后一个）开始。

private void readEachFile(String path) throws IOException {
    File[] dirs = new File(path).listFiles(new FileFilter() {
        @Override
        public boolean accept(File file) {
            if (file.isFile() && file.canRead()) {
                System.out.println("File Name:" + file.getName());
                    try (BufferedReader br = new BufferedReader(new FileReader(file))) 
                    {
                    String strLine;
                    while ((strLine = br.readLine()) != null) {
                        System.out.println(strLine);
                        decodeData(strLine);//reading only last two files from the folder
                    }
                    return false;
                } catch (NullPointerException | FileNotFoundException fne) {
                    fne.printStackTrace();
                } catch (IOException | RuntimeException re) {
                    re.printStackTrace();
                } 
            }
            return file.isDirectory() && file.canRead();
        }
    });
    for (File dir : dirs) {
        readFile(dir.getCanonicalPath());
    }
}

因此，请就从文件夹中读取所有文件提出建议。

控制台看起来像这样：

AIS MessageType:1
Repeat Indicator:0
MMSI Number:4190000
AIS Version:1
IMO Number:134217819
Navigational status:Constrained by her draught
Rate Of Turn(ROT):128
Speed Over Ground(SOG):0
Position Accuracy(PA):Low or Default
Longitude:39.881207
Latitude:23.278917
Course Over Ground(COG):0
Heading(HDG):511
Time Stamp:The positioning system is inoperative

2013-01-04:18:30:09;!ABVDM,1,1,,A,14R3JV00235U=h:4?>fKpIT@0859,0*6A (Started reading from last but one text file at some line)
Raw Binary:000001000100100010000011011010100110000000000000000010000011000101100101001101110000001010000100001111001110101110011011111000011001100100010000000000001000000101001001

Decoded Data
Creation Time:2013-01-04:18:30:09
NMEA Message Type:!ABVDM
Fragments in the message:1
Fragment no:1
AIS MessageType:1
Repeat Indicator:0
MMSI Number:304143000
AIS Version:0
IMO Number:134233
Navigational status:Under way using engine
Rate Of Turn(ROT):0
Speed Over Ground(SOG):13
Position Accuracy(PA):Low or Default
Longitude:39.01739
Latitude:14.812778
Course Over Ground(COG):99
Heading(HDG):306
Time Stamp:The positioning system is inoperative

2013-01-04:18:30:09;!ABVDM,1,1,,A,16?a7t00005<Vcl<3?vDq5fB0<0l,0*55
Raw Binary:000001000110001111101001000111111100000000000000000000000000000101001100100110101011110100001100000011001111111110010100111001000101101110010010000000001100000000110100

Decoded Data
Creation Time:2013-01-04:18:30:09
NMEA Message Type:!ABVDM
Fragments in the message:1
Fragment no:1
AIS MessageType:1
Repeat Indicator:0
MMSI Number:419055600
AIS Version:0
IMO Number:83
Navigational status:Under way using engine
Rate Of Turn(ROT):0
Speed Over Ground(SOG):0
Position Accuracy(PA):Low or Default
Longitude:36.329273
Latitude:42.12051
Course Over Ground(COG):125
Heading(HDG):183
Time Stamp:The positioning system is inoperative
................................................
................................................

它从文本文件的某个部分读取到末尾（最后一个文本文件），并开始读取最后一个文本文件直到结束。

File Name: sample8.txt
2013-01-04:18:30:10;!ABVDM,1,1,,A,15RKV0002i4b=6@9eF15I4H@06Ap,0*4C
...................................................................

并且出现在控制台上的输出已跳过这些字段而没有错误

strLine - Some line (started from some line from different text file)
Raw Binary:
Decoded Data
Creation Time:
NMEA Message Type:
Fragments in the message:
Fragment no:

并在解码时从“AIS MessageType”字段开始

4

3 回答 3

2

请注意，您在第一次 while 循环迭代期间关闭了输入流，这就是您只读取您尝试读取的每个文件的第一行的原因。将br.close()语句移到循环之外，因为它会关闭输入流并释放与流关联的任何系统资源。

一般来说，首选的方法是使用 Java 的 7 try-with-resources 语句，它会自动关闭您的资源，避免您将来出现资源泄漏问题。

 try (BufferedReader br = new BufferedReader(new FileReader(path))) {
        //do your logic here
 }
于 2013-10-14T05:33:52.317 回答
1 
while ((strLine = br.readLine()) != null) {
    System.out.println(strLine);
    decodeData(strLine);//reading only first line of every text file
    br.close();
    return false;
}

close()调用和return语句必须移到}读取循环之外的 ,之后。

于 2013-10-14T05:43:29.307 回答
1

如果您想要目录及其子目录中的所有文件，则使用递归解决：

private void fileScanner(String path) throws IOException {

    File[] dirs = new File(path).listFiles(new FileFilter() {
        @Override
        public boolean accept(File file) {

        if (file.isFile() && file.canRead()) {

            System.out.println(file.getName());
            BufferedReader br = new BufferedReader(new FileReader(file));
            String strLine;

            while ((strLine = br.readLine()) != null) {
                  System.out.println(strLine);
                  decodeData(strLine);
                  br.close();

                  return false; 
            }             
        }
        return file.isDirectory() && file.canRead();
        }
    });

    for (File dir : dirs) {

        fileScanner(dir.getCanonicalPath());
    }
}
于 2013-10-13T18:54:42.440 回答