我如何在控制台打印颜色?当处理器发送数据时,我想用不同的颜色显示数据,当处理器接收数据时,我想用不同的颜色显示数据。


当前回答

您可以使用ANSI转义序列来实现这一点。实际上,我已经在Java中为任何想要简单解决这个问题的人组合了这个类。它允许的不仅仅是颜色代码。

https://gist.github.com/nathan-fiscaletti/9dc252d30b51df7d710a

特性

完整的源代码文档 4位颜色支持(16种颜色) 8位颜色支持(255种颜色) 24位颜色支持(1670万种颜色) 支持十六进制和8位RGB值 支持通用格式 隐藏文本,反转颜色,闪烁,下划线,删除,暗淡,粗体,斜体 能够从包含ANSI转义序列的字符串中剥离ANSI。

示例使用

System.out.println(

   new AnsiStringBuilder()
       // All formatting functions support at least three different
       // overloads, each intended for a different use case.

       // Use case 1: Manual Reset
       .italic()
       .append("This is italicized and reset manually.")
       // You can optionaly supply an additional append string
       // to any of the reset functions that will be appended
       // after the formating reset has been applied.
       .resetItalic(System.lineSeparator())

       // Use case 2: Automatic Reset
       .dim("This is dimmed and reset automatically.")
       .append(System.lineSeparator())

       // Use case 3: Function Consumer
       .underline(
           sb -> {
               // The string builder passed to this function consumer
               // will automatically wrap all content appended to it
               // with the underline formatting.
               sb.color24(
                   "#00ff00",
                   "This is both underlined and green"
               );
           }
       )
       .append(System.lineSeparator())

);

其他回答

这个kotlin代码对我有用


import java.io.PrintStream

sealed class BackgroundColor(val value: Int) {
    object Default : BackgroundColor(0)

    // normal colors
    object Black : BackgroundColor(40)
    object Red : BackgroundColor(41)
    object Green : BackgroundColor(42)
    object Yellow : BackgroundColor(43)
    object Blue : BackgroundColor(44)
    object Magenta : BackgroundColor(45)
    object Cyan : BackgroundColor(46)
    object White : BackgroundColor(47)

    // colors with high contrast
    object BlackBright : BackgroundColor(100)
    object RedBright : BackgroundColor(101)
    object GreenBright : BackgroundColor(102)
    object YellowBright : BackgroundColor(103)
    object BlueBright : BackgroundColor(104)
    object MagentaBright : BackgroundColor(105)
    object CyanBright : BackgroundColor(106)
    object WhiteBright : BackgroundColor(107)
}

sealed class TextColor(val value: Int) {
    object Default : TextColor(0)

    // normal colors
    object Black : TextColor(30)
    object Red : TextColor(31)
    object Green : TextColor(32)
    object Yellow : TextColor(33)
    object Blue : TextColor(34)
    object Magenta : TextColor(35)
    object Cyan : TextColor(36)
    object White : TextColor(37)

    // colors with high contrast
    object BlackBright : TextColor(90)
    object RedBright : TextColor(91)
    object GreenBright : TextColor(92)
    object YellowBright : TextColor(93)
    object BlueBright : TextColor(94)
    object MagentaBright : TextColor(95)
    object CyanBright : TextColor(96)
    object WhiteBright : TextColor(97)
}

fun styleOutput(
    backgroundColor: BackgroundColor = BackgroundColor.Default,
    textColor: TextColor = TextColor.Default,
    boldText : Boolean = false,
    italicText : Boolean = false,
    underLineText : Boolean = false,
    action : PrintStream.() -> Unit
) {
    val styleFormat = StringBuilder("${27.toChar()}[${backgroundColor.value};${textColor.value}")

   if (boldText)
       styleFormat.append(";1")

    if (italicText)
        styleFormat.append(";3")

    if (underLineText)
        styleFormat.append(";4")

    styleFormat.append("m")

    print(styleFormat)
    System.out.action()
    print("${27.toChar()}[0m")
}

然后使用它

print("text without styling")
styleOutput(backgroundColor = BackgroundColor.Blue, textColor = TextColor.GreenBright, boldText = true) {
    print("text with styling")
}
print("text without styling")

一种相当可移植的方法是使用原始转义序列。参见http://en.wikipedia.org/wiki/ANSI_escape_code

[编辑为user9999999 on 2017-02-20]

Java不“处理代码”,这是真的,但是Java输出你让它输出的东西。Windows控制台将ESC (chr(27))视为另一个符号(←),这不是Java的错。

如果有人正在寻找一个快速的解决方案,请随意使用以下helper类:)

public class Log {

    public static final String ANSI_RESET = "\u001B[0m";
    public static final String ANSI_BLACK = "\u001B[30m";
    public static final String ANSI_RED = "\u001B[31m";
    public static final String ANSI_GREEN = "\u001B[32m";
    public static final String ANSI_YELLOW = "\u001B[33m";
    public static final String ANSI_BLUE = "\u001B[34m";
    public static final String ANSI_PURPLE = "\u001B[35m";
    public static final String ANSI_CYAN = "\u001B[36m";
    public static final String ANSI_WHITE = "\u001B[37m";

    //info
    public static void i(String className, String message) {
        System.out.println(ANSI_GREEN + className + " : " + message + ANSI_RESET);
    }

    //error
    public static void e(String className, String message) {
        System.out.println(ANSI_RED + className + " : " + message + ANSI_RESET);
    }

    //debug
    public static void d(String className, String message) {
        System.out.println(ANSI_BLUE + className + " : " + message + ANSI_RESET);
    }

    //warning
    public static void w(String className, String message) {
        System.out.println(ANSI_YELLOW + className + " : " + message + ANSI_RESET);
    }

}

用法:

Log.i(TAG,"This is an info message");

Log.e(TAG,"This is an error message");

Log.w(TAG,"This is a warning message");

Log.d(TAG,"This is a debug message");

感谢@whiteFang34提供的ANSI代码。

您可以使用ANSI转义序列来实现这一点。实际上,我已经在Java中为任何想要简单解决这个问题的人组合了这个类。它允许的不仅仅是颜色代码。

https://gist.github.com/nathan-fiscaletti/9dc252d30b51df7d710a

特性

完整的源代码文档 4位颜色支持(16种颜色) 8位颜色支持(255种颜色) 24位颜色支持(1670万种颜色) 支持十六进制和8位RGB值 支持通用格式 隐藏文本,反转颜色,闪烁,下划线,删除,暗淡,粗体,斜体 能够从包含ANSI转义序列的字符串中剥离ANSI。

示例使用

System.out.println(

   new AnsiStringBuilder()
       // All formatting functions support at least three different
       // overloads, each intended for a different use case.

       // Use case 1: Manual Reset
       .italic()
       .append("This is italicized and reset manually.")
       // You can optionaly supply an additional append string
       // to any of the reset functions that will be appended
       // after the formating reset has been applied.
       .resetItalic(System.lineSeparator())

       // Use case 2: Automatic Reset
       .dim("This is dimmed and reset automatically.")
       .append(System.lineSeparator())

       // Use case 3: Function Consumer
       .underline(
           sb -> {
               // The string builder passed to this function consumer
               // will automatically wrap all content appended to it
               // with the underline formatting.
               sb.color24(
                   "#00ff00",
                   "This is both underlined and green"
               );
           }
       )
       .append(System.lineSeparator())

);

如果你使用Kotlin(它与Java无缝工作),你可以创建这样一个枚举:

enum class AnsiColor(private val colorNumber: Byte) {
    BLACK(0), RED(1), GREEN(2), YELLOW(3), BLUE(4), MAGENTA(5), CYAN(6), WHITE(7);

    companion object {
        private const val prefix = "\u001B"
        const val RESET = "$prefix[0m"
        private val isCompatible = "win" !in System.getProperty("os.name").toLowerCase()
    }

    val regular get() = if (isCompatible) "$prefix[0;3${colorNumber}m" else ""
    val bold get() = if (isCompatible) "$prefix[1;3${colorNumber}m" else ""
    val underline get() = if (isCompatible) "$prefix[4;3${colorNumber}m" else ""
    val background get() = if (isCompatible) "$prefix[4${colorNumber}m" else ""
    val highIntensity get() = if (isCompatible) "$prefix[0;9${colorNumber}m" else ""
    val boldHighIntensity get() = if (isCompatible) "$prefix[1;9${colorNumber}m" else ""
    val backgroundHighIntensity get() = if (isCompatible) "$prefix[0;10${colorNumber}m" else ""
}

然后像这样使用is:(下面的代码展示了所有颜色的不同样式)

val sampleText = "This is a sample text"
enumValues<AnsiColor>().forEach { ansiColor ->
    println("${ansiColor.regular}$sampleText${AnsiColor.RESET}")
    println("${ansiColor.bold}$sampleText${AnsiColor.RESET}")
    println("${ansiColor.underline}$sampleText${AnsiColor.RESET}")
    println("${ansiColor.background}$sampleText${AnsiColor.RESET}")
    println("${ansiColor.highIntensity}$sampleText${AnsiColor.RESET}")
    println("${ansiColor.boldHighIntensity}$sampleText${AnsiColor.RESET}")
    println("${ansiColor.backgroundHighIntensity}$sampleText${AnsiColor.RESET}")
}

如果运行在不支持这些ANSI代码的Windows上,isCompatible检查通过将代码替换为空字符串来避免问题。