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2023-09-27 09:00:00

如何在控制台使用System.out.println打印颜色?

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

如果您的终端支持它，您可以使用ANSI转义码在输出中使用颜色。它通常适用于Unix shell提示符;然而，它并不适用于Windows命令提示符(尽管，它适用于Cygwin)。例如，你可以为颜色定义这样的常量:

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";

然后，您可以在必要时引用它们。

例如，使用上述常量，你可以在受支持的终端上输出如下红色文本:

System.out.println(ANSI_RED + "This text is red!" + ANSI_RESET);

更新:您可能想要查看Jansi库。它提供了一个API，并支持使用JNI的Windows。我还没试过;然而，它看起来很有希望。

更新2:同样，如果你想改变文本的背景颜色为不同的颜色，你也可以尝试以下方法:

public static final String ANSI_BLACK_BACKGROUND = "\u001B[40m";
public static final String ANSI_RED_BACKGROUND = "\u001B[41m";
public static final String ANSI_GREEN_BACKGROUND = "\u001B[42m";
public static final String ANSI_YELLOW_BACKGROUND = "\u001B[43m";
public static final String ANSI_BLUE_BACKGROUND = "\u001B[44m";
public static final String ANSI_PURPLE_BACKGROUND = "\u001B[45m";
public static final String ANSI_CYAN_BACKGROUND = "\u001B[46m";
public static final String ANSI_WHITE_BACKGROUND = "\u001B[47m";

例如:

System.out.println(ANSI_GREEN_BACKGROUND + "This text has a green background but default text!" + ANSI_RESET);
System.out.println(ANSI_RED + "This text has red text but a default background!" + ANSI_RESET);
System.out.println(ANSI_GREEN_BACKGROUND + ANSI_RED + "This text has a green background and red text!" + ANSI_RESET);
2011-04-23 05:56:06

其他回答

如果您的终端支持它，您可以使用ANSI转义码在输出中使用颜色。它通常适用于Unix shell提示符;然而，它并不适用于Windows命令提示符(尽管，它适用于Cygwin)。例如，你可以为颜色定义这样的常量:

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";

然后，您可以在必要时引用它们。

例如，使用上述常量，你可以在受支持的终端上输出如下红色文本:

System.out.println(ANSI_RED + "This text is red!" + ANSI_RESET);

更新:您可能想要查看Jansi库。它提供了一个API，并支持使用JNI的Windows。我还没试过;然而，它看起来很有希望。

更新2:同样，如果你想改变文本的背景颜色为不同的颜色，你也可以尝试以下方法:

public static final String ANSI_BLACK_BACKGROUND = "\u001B[40m";
public static final String ANSI_RED_BACKGROUND = "\u001B[41m";
public static final String ANSI_GREEN_BACKGROUND = "\u001B[42m";
public static final String ANSI_YELLOW_BACKGROUND = "\u001B[43m";
public static final String ANSI_BLUE_BACKGROUND = "\u001B[44m";
public static final String ANSI_PURPLE_BACKGROUND = "\u001B[45m";
public static final String ANSI_CYAN_BACKGROUND = "\u001B[46m";
public static final String ANSI_WHITE_BACKGROUND = "\u001B[47m";

例如:

System.out.println(ANSI_GREEN_BACKGROUND + "This text has a green background but default text!" + ANSI_RESET);
System.out.println(ANSI_RED + "This text has red text but a default background!" + ANSI_RESET);
System.out.println(ANSI_GREEN_BACKGROUND + ANSI_RED + "This text has a green background and red text!" + ANSI_RESET);
2011-04-23 05:56:06

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。

2011-04-23 05:56:33

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。

2019-01-20 00:53:34

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。

2017-09-23 03:22:43

失败:

public static final String ANSI_STRIKEOUT_BLACK = "\u001B[30;9m";
public static final String ANSI_STRIKEOUT_RED = "\u001B[31;9m";
public static final String ANSI_STRIKEOUT_GREEN = "\u001B[32;9m";
public static final String ANSI_STRIKEOUT_YELLOW = "\u001B[33;9m";
public static final String ANSI_STRIKEOUT_BLUE = "\u001B[34;9m";
public static final String ANSI_STRIKEOUT_PURPLE = "\u001B[35;9m";
public static final String ANSI_STRIKEOUT_CYAN = "\u001B[36;9m";
public static final String ANSI_STRIKEOUT_WHITE = "\u001B[37;9m";
2020-04-21 11:46:55

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