bufferedwriter 在写入过程中停止 [英] bufferedwriter stops in the middle of writing

问题描述

出于某种原因，此代码会导致 text.txt 文件被截断.它应该(根据我的说法)写出 1000 个结果，但输出文件有不同数量的行(取决于运行).奇怪的是，对文件的写入在写入命令的中间停止，因此一行可能不完整.目前，最新运行的文本文件的最后三行如下:

For some reason this code results in a truncated text.txt file. It should (according to me) write out 1000 results, but the output file has various amounts of lines (depending on the run). Weirdly, the writing to the file stops in the middle of the write command, such that a line may not be complete. Currently, the last three lines of the text file for the latest run was as follows:

749, 78.97988, 97.80454, 99.6625, 94.00000015258789
750, 4.1745043, 86.64212, 107.59311, 71.00000008583069
751,

就是这样.之后就没有别的了.

and that's it. Nothing else after that.

代码如下:

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;
import java.util.Random;

public class ColorGrayScale {

/**
 * @param args
 * @throws IOException
 */
@SuppressWarnings("resource")
public static void main(String[] args) throws IOException {
    // TODO Auto-generated method stub
    Writer out = new BufferedWriter(new FileWriter("test.txt"),16*1024);
    Random generator = new Random();
    float red = 0, green = 0, blue = 0;
    int i = 0;

    while (i<1000) {

        float grey = generator.nextInt(127) + 64;
        int sequence = generator.nextInt(6) + 1; // to pick from 1 of six
                                                    // orders
        switch (sequence) { // the various orders that red green and blue
                            // are going to be in
        case 1:
            red = (float) (generator.nextFloat() * (grey / .21));
            green = (float) (generator.nextFloat() * ((grey - (red * .21)) / .71));
            blue = (float) ((grey - (red * .21) - (green * .71)) / 0.08);
            break;
        case 2:
            red = (float) (generator.nextFloat() * (grey / .21));
            blue = (float) (generator.nextFloat() * ((grey - (red * .21)) / .08));
            green = (float) ((grey - (red * .21) - (blue * .08)) / 0.71);
            break;
        case 3:
            green = (float) (generator.nextFloat() * (grey / .71));
            red = (float) (generator.nextFloat() * ((grey - (green * .71)) / .21));
            blue = (float) ((grey - (red * .21) - (green * .71)) / .08);
            break;
        case 4:
            green = (float) (generator.nextFloat() * (grey / .71));
            blue = (float) (generator.nextFloat() * ((grey - (green * .71)) / .08));
            red = (float) ((grey - (green * .71) - (blue * .08)) / .21);
            break;
        case 5:
            blue = (float) (generator.nextFloat() * (grey / .08));
            red = (float) (generator.nextFloat() * ((grey - (blue * .08)) / .21));
            green = (float) ((grey - (blue * .08) - (red * .21)) / .71);
            break;
        case 6:
            blue = (float) (generator.nextFloat() * (grey / .08));
            green = (float) (generator.nextFloat() * ((grey - (blue * .08)) / .71));
            red = (float) ((grey - (blue * .08) - (green * .71)) / .21);
            break;
        }
        if (red < 256 && blue < 256 && green < 256) {
             out.write("" + i + ", " + red + ", " + green + ", " + blue
                    + ", " + (.21 * red + .71 * green + 0.08 * blue + "\n"));
            i++;
        }
    }
}

}

推荐答案

您忘记了 close() 编写器，因此您从未给它机会将缓冲输出刷新到磁盘.

You forgot to close() the writer, so you never gave it a chance to flush buffered output to disk.

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