如何在控制台中使用ASCII创建表？

Question

我想组织这样的信息:

信息是按照单元格组织的,而System.out.println信息则非常混乱.

Answer 1

您可以使用System.out.format()或System.out.printf()(printf内部只是调用,format因此两个方法都给出相同的结果).

下面是一个示例,它将文本左对齐并用空格填充未使用的位置.可以使用向左对齐字符串%-15s,这意味着:

• % 保留(占位符)
• 15 角色的"地方"
• s String数据类型
• - 并从左侧开始打印.

如果要处理数字,请使用d后缀,例如%-4d应放在列左侧的最多4位数字.

BTW printf在打印数据后不会自动添加行分隔符,因此如果想要将光标移动到下一行,我们需要自己完成.我们可以使用\ror \n,或者让Formatter生成OS依赖行分隔符(比如Windows \r\n)我们可以使用%n占位符(注意:它不需要任何数据作为参数,Java将提供基于OS的正确序列).

您可以Formatter在该类的文档中找到有关语法支持的更多信息.

String leftAlignFormat = "| %-15s | %-4d |%n";

System.out.format("+-----------------+------+%n");
System.out.format("| Column name     | ID   |%n");
System.out.format("+-----------------+------+%n");
for (int i = 0; i < 5; i++) {
    System.out.format(leftAlignFormat, "some data" + i, i * i);
}
System.out.format("+-----------------+------+%n");

产量

+-----------------+------+
| Column name     | ID   |
+-----------------+------+
| some data0      | 0    |
| some data1      | 1    |
| some data2      | 4    |
| some data3      | 9    |
| some data4      | 16   |
+-----------------+------+

Answer 2

试试这个选择:asciitable.

它提供了几种文本表的实现,最初使用ASCII和UTF-8字符作为边框.

这是一个示例表:

    ????????????????????????????????????????????????????????????????????????????
    ? Table Heading                                                            ?
    ????????????????????????????????????????????????????????????????????????????
    ? first row (col1) ? with some        ? and more         ? even more       ?
    ?                  ? information      ? information      ?                 ?
    ????????????????????????????????????????????????????????????????????????????
    ? second row       ? with some        ? and more         ? even more       ?
    ? (col1)           ? information      ? information      ?                 ?
    ?                  ? (col2)           ? (col3)           ?                 ?
    ????????????????????????????????????????????????????????????????????????????

查找最新版本: http ://mvnrepository.com/artifact/de.vandermeer/asciitable

另见: https ://stackoverflow.com/a/39806611/363573

Answer 3

我专门为此创建的类是完全动态的:https: //github.com/MRebhan/crogamp/blob/master/src/com/github/mrebhan/crogamp/cli/TableList.java

你可以像这样使用它:

TableList tl = new TableList(3, "ID", "String 1", "String 2").sortBy(0).withUnicode(true);
// from a list
yourListOrWhatever.forEach(element -> tl.addRow(element.getID(), element.getS1(), element.getS2()));
// or manually
tl.addRow("Hi", "I am", "Bob");

tl.print();

使用unicode字符会看起来像这样(注意:在控制台中看起来会更好,因为所有字符都相同):

??????????????????????????????????????????????????????????????????????????????????????????????????????????????????
? Command ? Description                                                             ? Syntax                     ?
??????????????????????????????????????????????????????????????????????????????????????????????????????????????????
? bye     ? Quits the application.                                                  ?                            ?
? ga      ? Adds the specified game.                                                ? <id> <description> <path>  ?
? gl      ? Lists all currently added games                                         ? [pattern]                  ?
? gr      ? Rebuilds the files of the currently active game.                        ?                            ?
? gs      ? Selects the specified game.                                             ? <id>                       ?
? help    ? Lists all available commands.                                           ? [pattern]                  ?
? license ? Displays licensing info.                                                ?                            ?
? ma      ? Adds a mod to the currently active game.                                ? <id> <file>                ?
? md      ? Deletes the specified mod and removes all associated files.             ? <id>                       ?
? me      ? Toggles if the selected mod is active.                                  ? <id>                       ?
? ml      ? Lists all mods for the currently active game.                           ? [pattern]                  ?
? mm      ? Moves the specified mod to the specified position in the priority list. ? <id> <position>            ?
? top kek ? Test command. Do not use, may cause death and/or destruction            ?                            ?
? ucode   ? Toggles advanced unicode. (Enhanced characters)                         ? [on|true|yes|off|false|no] ?
??????????????????????????????????????????????????????????????????????????????????????????????????????????????????

并且unicode chars off(省略.withUnicode(true)):

Command | Description                                                             | Syntax                    
--------+-------------------------------------------------------------------------+---------------------------
bye     | Quits the application.                                                  |                           
ga      | Adds the specified game.                                                | <id> <description> <path> 
gl      | Lists all currently added games                                         | [pattern]                 
gr      | Rebuilds the files of the currently active game.                        |                           
gs      | Selects the specified game.                                             | <id>                      
help    | Lists all available commands.                                           | [pattern]                 
license | Displays licensing info.                                                |                           
ma      | Adds a mod to the currently active game.                                | <id> <file>               
md      | Deletes the specified mod and removes all associated files.             | <id>                      
me      | Toggles if the selected mod is active.                                  | <id>                      
ml      | Lists all mods for the currently active game.                           | [pattern]                 
mm      | Moves the specified mod to the specified position in the priority list. | <id> <position>           
top kek | Test command. Do not use, may cause death and/or destruction            |                           
ucode   | Toggles advanced unicode. (Enhanced characters)                         | [on|true|yes|off|false|no]

Answer 4

使用 System.out.printf()

例如,

String s = //Any string
System.out.printf(%10s, s);

将打印出String的内容,正好占用10个字符.因此,如果您想要一个表,只需确保表中的每个单元格打印出相同的长度.另请注意,printf()不会打印新行,因此您必须自己打印.