读取同一应用程序先前写入的缓存文件
我正在使用下面的代码写入一个文件：
File file = new File(getCacheDir(), "cachefile");
FileOutputStream fos = new FileOutputStream(file);
StringBuilder cachetext = new StringBuilder();
Iterator bri = brands.iterator();
Iterator bli = brand_id.iterator();
while(bli.hasNext()) {
cachetext.append(bli.next() + "|" + bri.next() + System.getProperty("line.separator"));
}
fos.write(cachetext.toString().getBytes());
fos.close();
这工作正常 - 没有错误，文件最终包含我期望它包含的内容。然而，当我通过 openFileInput() 读取它时，我收到一个异常，告诉我不允许使用路径分隔符
FileInputStream fis = openFileInput(getCacheDir() + "/cachefile");
，其中包含斜杠，但是我还能如何指定要打开的文件的路径呢？当然，一定有办法做到这一点，但我无法通过谷歌找到答案（“读取”、“缓存”和“文件”不是最利基的术语......）所以我想我会尝试人性化的接触。提前致谢！
I'm writing to a file using the code below:
File file = new File(getCacheDir(), "cachefile");
FileOutputStream fos = new FileOutputStream(file);
StringBuilder cachetext = new StringBuilder();
Iterator bri = brands.iterator();
Iterator bli = brand_id.iterator();
while(bli.hasNext()) {
cachetext.append(bli.next() + "|" + bri.next() + System.getProperty("line.separator"));
}
fos.write(cachetext.toString().getBytes());
fos.close();
This works fine - no errors and the file ends up containing what I expect it to contain. When I go to read it via openFileInput(), however, I get an exception telling me that path separators are not allowed
FileInputStream fis = openFileInput(getCacheDir() + "/cachefile");
Fair enough, that contains a slash, but how else can I specify the path of the file I want to open? There must be a way to do this, of course, but I can't find answers via Google ('read', 'cache' and 'file' not being the most niche of terms ...) so I thought I'd try the human touch. Thanks in advance!
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您的操作方式与创建输出文件的方式几乎相同：
you do it pretty much the same way you created the output file: