Question

我一直在互联网上四处寻找，试图找出哪种方法可以读取不长的文本文件（这里的用例涉及小的OpenGL着色器）。我最终得到了这个：

private static String load(final String path)
{
    String text = null;

    try
    {
        final FileReader fileReader = new FileReader(path);
        fileReader.read(CharBuffer.wrap(text));

        // ...
    }
    catch(IOException e)
    {
        e.printStackTrace();
    }

    return text;
}

在哪些情况下，这段代码会导致效率低下？这是CharBuffer.wrap(text)好事吗？

Answer 1

我通常会像这样滚动。 CharBuffer.wrap（text）似乎只能让你获得一个角色... File Reader docs

CMake Error at C:/Program Files (x86)/CMake/share/cmake-3.3/Modules/FindBoost.cmake:1245 (message):
  Unable to find the requested Boost libraries.

  Boost version: 1.60.0

  Boost include path: C:/Boost/boost_1_60_0

  Could not find the following Boost libraries:

          boost_system
          boost_thread
          boost_filesystem
          boost_date_time

  No Boost libraries were found.  You may need to set BOOST_LIBRARYDIR to     the
  directory containing Boost libraries or BOOST_ROOT to the location of
  Boost.
Call Stack (most recent call first):
  CMakeLists.txt:11 (find_package)


CMake Error at CMakeLists.txt:107 (set):
  Syntax error in cmake code at

    C:/libs/caffe/caffe-windows-dependencies/CMakeLists.txt:107

  when parsing string

    ${CMAKE_INSTALL_

  syntax error, unexpected $end, expecting } (16)

Answer 2

如果您想逐行阅读文件：

BufferedReader br = new BufferedReader(new FileReader(path));
try {
    StringBuilder sb = new StringBuilder();
    String line = br.readLine();

    while (line != null) {
        sb.append(line);
        sb.append(System.lineSeparator());
        line = br.readLine();
    }
    String everything = sb.toString();
} finally {
    br.close();
}

如果您想一次性阅读完整的文件：

String text = new String（Files.readAllBytes（...））或Files.readAllLines（...）

这是从文本文件中读取的好方法吗？

2 个答案: