Java 将数据以表格格式写入文本文件
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Writing data to text file in table format
提问by Moko
So far I have this:
到目前为止，我有这个：
File dir = new File("C:\Users\User\Desktop\dir\dir1\dir2);
dir.mkdirs();
File file = new File(dir, "filename.txt");
FileWriter archivo = new FileWriter(file);
archivo.write(String.format("%20s %20s", "column 1", "column 2 \r\n"));
archivo.write(String.format("%20s %20s", "data 1", "data 2"));
archivo.flush();
archivo.close();
However. the file output looks like this:
然而。文件输出如下所示：
Which I do not like at all.
我一点都不喜欢。
How can I make a better table format for the output of a text file?
如何为文本文件的输出制作更好的表格格式？
Would appreciate any assistance.
将不胜感激任何帮助。
Thanks in advance!
提前致谢！
EDIT: Fixed!
编辑：固定！
Also, instead of looking like
此外，而不是看起来像
column 1 column 2
data 1 data 2
How can I make it to look like this:
我怎样才能让它看起来像这样：
column 1 column 2
data 1 data 2
Would prefer it that way.
宁愿那样。
采纳答案by MadProgrammer
The \r\nis been evaluated as part of the second parameter, so it basically calculating the required space as something like... 20 - "column 2".length() - " \r\n".length(), but since the second line doesn't have this, it takes less space and looks misaligned...
将\r\n被被评为第二个参数的一部分，因此，它基本上计算所需的空间，就像这样...... 20 - "column 2".length() - " \r\n".length()，但由于第二行没有这一点，它需要较少的空间和外观错位...
Try adding the \r\nas part of the base format instead, for example...
尝试添加\r\n作为基本格式的一部分，例如...
String.format("%20s %20s \r\n", "column 1", "column 2")
This generates something like...
这会产生类似...
column 1 column 2
data 1 data 2
In my tests...
在我的测试中...
回答by Jon Skeet
You're currently including " \r\n"within your right-aligned second argument. I suspect you don't want the space at all, and you don't want the \r\nto be part of the count of 20 characters.
您当前包含" \r\n"在右对齐的第二个参数中。我怀疑您根本不想要空格，并且您不希望 成为\r\n20 个字符计数的一部分。
To left-align instead of right-aligning, use the -flag, i.e. %-20sinstead of %20s. See the documentation for Formatterdocumentation for more information.
要左对齐而不是右对齐，请使用-标志，即%-20s代替%20s。有关Formatter更多信息，请参阅文档文档。
Additionally, you can make the code work in a more cross-platform way using %nto represent the current platform's line terminator (unless you specificallywant a Windows file.
此外，您可以使用%n代表当前平台的行终止符使代码以更跨平台的方式工作（除非您特别想要一个 Windows 文件。
I'd recommend the use of Files.newBufferedWriteras well, as that allows you to specify the character encoding (and will use UTF-8 otherwise, which is better than using the platform default)... and use a try-with-resources statement to close the writer even in the face of an exception:
我也建议使用Files.newBufferedWriter，因为它允许您指定字符编码（否则将使用 UTF-8，这比使用平台默认值更好）......并使用 try-with-resources 语句来即使遇到异常也要关闭作者：
try (Writer writer = Files.newBufferedWriter(file.toPath())) {
writer.write(String.format("%-20s %-20s%n", "column 1", "column 2"));
writer.write(String.format("%-20s %-20s%n", "data 1", "data 2"));
}
回答by CLOUGH
I think you are trying to get data in tabular format. I've developed a Java library that can build much complex tables with more customization. You can get the source code here. Following are some of the basic table-views that my library can create. Hope this is useful enough!
我认为您正在尝试以表格格式获取数据。我开发了一个 Java 库，它可以通过更多的自定义来构建非常复杂的表。您可以在此处获取源代码。以下是我的库可以创建的一些基本表视图。希望这足够有用！
COLUMN WISE GRID(DEFAULT)
列智能网格（默认）
+--------------+--------------+--------------+--------------+-------------+
|NAME |GENDER |MARRIED | AGE| SALARY($)|
+--------------+--------------+--------------+--------------+-------------+
|Eddy |Male |No | 23| 1200.27|
|Libby |Male |No | 17| 800.50|
|Rea |Female |No | 30| 10000.00|
|Deandre |Female |No | 19| 18000.50|
|Alice |Male |Yes | 29| 580.40|
|Alyse |Female |No | 26| 7000.89|
|Venessa |Female |No | 22| 100700.50|
+--------------+--------------+--------------+--------------+-------------+
FULL GRID
全格
+------------------------+-------------+------+-------------+-------------+
|NAME |GENDER |MARRIE| AGE| SALARY($)|
+------------------------+-------------+------+-------------+-------------+
|Eddy |Male |No | 23| 1200.27|
+------------------------+-------------+------+-------------+-------------+
|Libby |Male |No | 17| 800.50|
+------------------------+-------------+------+-------------+-------------+
|Rea |Female |No | 30| 10000.00|
+------------------------+-------------+------+-------------+-------------+
|Deandre |Female |No | 19| 18000.50|
+------------------------+-------------+------+-------------+-------------+
|Alice |Male |Yes | 29| 580.40|
+------------------------+-------------+------+-------------+-------------+
|Alyse |Female |No | 26| 7000.89|
+------------------------+-------------+------+-------------+-------------+
|Venessa |Female |No | 22| 100700.50|
+------------------------+-------------+------+-------------+-------------+
NO GRID
无网格
NAME GENDER MARRIE AGE SALARY($)
Alice Male Yes 29 580.40
Alyse Female No 26 7000.89
Eddy Male No 23 1200.27
Rea Female No 30 10000.00
Deandre Female No 19 18000.50
Venessa Female No 22 100700.50
Libby Male No 17 800.50
Eddy Male No 23 1200.27
Libby Male No 17 800.50
Rea Female No 30 10000.00
Deandre Female No 19 18000.50
Alice Male Yes 29 580.40
Alyse Female No 26 7000.89
Venessa Female No 22 100700.50
回答by Pedro Fernandes
try {
PrintWriter outputStream = new PrintWriter("myObjects.txt");
outputStream.println(String.format("%-20s %-20s %-20s", "Name", "Age", "Gender"));
outputStream.println(String.format("%-20s %-20s %-20s", "John", "30", "Male"));
outputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
