Java 在文件夹中创建一个文本文件
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create a text file in a folder
提问by arsenal
I want to create a text file into that folder that I am creating here.
我想在我在这里创建的那个文件夹中创建一个文本文件。
File dir = new File("crawl_html");
dir.mkdir();
String hash = MD5Util.md5Hex(url1.toString());
System.out.println("hash:-" + hash);
File file = new File(""+dir+"\""+hash+".txt");
But this code doesn't create the text file into that folder..Instead it makes the text file outside that folder..
但是此代码不会将文本文件创建到该文件夹中。相反，它使文本文件位于该文件夹之外。
采纳答案by hoipolloi
One of java.io.File's constructors takes a parent directory. You can do this instead:
java.io.File 的构造函数之一采用父目录。你可以这样做：
final File parentDir = new File("crawl_html");
parentDir.mkdir();
final String hash = "abc";
final String fileName = hash + ".txt";
final File file = new File(parentDir, fileName);
file.createNewFile(); // Creates file crawl_html/abc.txt
回答by adarshr
What you need is
你需要的是
File file = new File(dir, hash + ".txt");
The key here is the File(File parent, String child)constructor. It creates a file with the specified name under the provided parent directory (provided that directory exists, of course).
这里的关键是File(File parent, String child)构造函数。它在提供的父目录下创建一个具有指定名称的文件（当然，前提是该目录存在）。
回答by JB Nizet
The line
线
new File(""+dir+"\""+hash+".txt");
makes a file named crawl_html"the_hash.txt, because \"inside a String literal is used to represent a double quote caracter, not a backslash. \\must be used to represent a backslash.
生成一个名为 的文件crawl_html"the_hash.txt，因为\"在字符串文字内部用于表示双引号字符，而不是反斜杠。\\必须用于表示反斜杠。
Use the File constructor taking a File (directory) as the first argument, and a file name as a second argument:
使用 File 构造函数，将文件（目录）作为第一个参数，将文件名作为第二个参数：
new File(dir, hash + ".txt");
回答by Wolf
your path-delimiter seems off
你的路径分隔符似乎关闭
try:
尝试：
File file = new File ( "" + dir + "/" + hash + ".txt" );
