java - 写入文件的 Printwriter

Question

为什么我无法通过PrintWriter写入大量数据？

String result = acquireLengthyData();
PrintWriter out = new PrintWriter("D:/log.txt");
out.println(result);

其中 result.lenght() = 189718。但 log.txt 中缺少一些数据。为什么？如何正确写入文件？

Answer 1

写入后需要刷新，它会刷新流。 PrintWriter#flush 就可以做到这一点。

Flushes the stream. If the stream has saved any characters from the various write() methods in a buffer, write them immediately to their intended destination.

PrintWriter#flush - Java doc

代码片段 -

PrintWriter out = new PrintWriter("D:/log.txt");
out.println(result);
out.flush();
out.close();

使用后不要忘记关闭编写器。