文件到字节[]读取不正确

时间:2018-10-14 20:09:58

标签: java java-io

我正在保存/读取字节数组。当我打印要保存的字节时,它们都是正确的值,但是当我读取它们时,在保存的每个字节之间都有3个随机负数,并且在字节的末尾还有一堆额外的随机值,并且所有负数数字不见了。

阅读代码:

byte[] tmpData = new byte[(int) file.length()];
try {
    tmpData = IOUtil.readFully(file);
} catch (IOException e) {
    e.printStackTrace();
}

IOUtil.readFully

public static byte[] readFully(File file) throws IOException {
    Checks.notNull(file, "File");
    Checks.check(file.exists(), "Provided file does not exist!");
    InputStream is = new FileInputStream(file);
    Throwable var2 = null;

    byte[] var8;
    try {
        long length = file.length();
        if (length > 2147483647L) {
            throw new IOException("Cannot read the file into memory completely due to it being too large!");
        }

        byte[] bytes = new byte[(int)length];
        int offset = 0;

        int numRead;
        for(boolean var7 = false; offset < bytes.length && (numRead = is.read(bytes, offset, bytes.length - offset)) >= 0; offset += numRead) {
            ;
        }

        if (offset < bytes.length) {
            throw new IOException("Could not completely read file " + file.getName());
        }

        is.close();
        var8 = bytes;
    } catch (Throwable var12) {
        var2 = var12;
        throw var12;
    } finally {
        $closeResource(var2, is);
    }

    return var8;
}

写作代码:

BufferedWriter writer = new BufferedWriter(new FileWriter(path, false));
int[] data = new int[] { 19,0,0,0,0,28,1,1,28,2,1,36,1,1,31,0,2,-1,0,2 }
for(int bytes : data) { writer.write(bytes); }

读取字节: 10,0,10,0,10,0,10,0,10,28,10,1,10,1,10,28,10,2,10,1,10,36,10,1,10, 1,10,31,10,0,10,2,10,-17,-65,-65,10,0,10 文件中的数据(使用记事本++打开) 空行,0,0,0,0,28,1,1,28,2,1,$,1,1,1,31,0,2,ï¿¿,0,2 出于某种原因,以前会读取未写入文件的负数。

1 个答案:

答案 0 :(得分:3)

只需使用标准库(import java.nio.file.Files;)。

byte[] tmpData = Files.readAllBytes(file.toPath());

Files.write(file.toPath(), bytes);