当前,我所有的INFO,SEVERE和FINE日志都以红色打印。我想将INFO和FINE日志更改为白色。
我发现许多文章通过创建新的Fommater来改变颜色。我想知道如何通过修改logging.properties来更改打印颜色?
我正在使用Java默认日志记录库Util.Logging.Logger
环境:
答案 0 :(得分:1)
当前,我所有的INFO,SEVERE和FINE日志都以红色打印。
这取决于正在消耗System.err
的进程。 Since the output is red I assume you are using an IDE。您正在使用哪个IDE?也许它具有修改控制台输出呈现方式的设置。对于日食,您可以:
我想知道如何通过修改logging.properties来更改打印颜色?
您只能从logging.properties中执行的操作是安装一种新型的Formatter或第3方处理程序,该处理程序可以更改输出颜色,但是这取决于所使用的控制台输出流的呈现方式(例如,EG HTML与BASH终端)。
答案 1 :(得分:0)
问题是Eclipse总是以相同的颜色(在这种情况下为红色)显示stderr输出。它可以在设置中进行配置,但对于所有stderr流,它始终是相同的。
我的解决方案是为控制台处理程序使用自定义格式程序,并根据每条消息的级别在每条消息之前注入ANSI颜色代码。因此,我基于JDK8中的原始SimpleFormatter.java
做到了这一点。这是代码:
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.Date;
import java.util.logging.Formatter;
import java.util.logging.LogRecord;
public class CustomFormatter extends Formatter {
public static final String ANSI_RESET = "\u001B[0m";
public static final String ANSI_RED = "\u001B[31m";
public static final String ANSI_YELLOW = "\u001B[33m";
public static final String ANSI_CYAN = "\u001B[36m";
private final Date dat = new Date();
private static final String format = "%1$s %2$tb %2$td, %2$tY %2$tl:%2$tM:%2$tS %2$Tp %3$s%n%5$s: %6$s%7$s%n";
@Override
public String format(LogRecord record) {
dat.setTime(record.getMillis());
String source;
if (record.getSourceClassName() != null) {
source = record.getSourceClassName();
if (record.getSourceMethodName() != null) {
source += " " + record.getSourceMethodName();
}
} else {
source = record.getLoggerName();
}
String message = formatMessage(record);
String throwable = "";
if (record.getThrown() != null) {
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
pw.println();
record.getThrown().printStackTrace(pw);
pw.close();
throwable = sw.toString();
}
switch (record.getLevel().toString()) {
case "INFO":
return String.format(format, ANSI_CYAN, dat, source, record.getLoggerName(),
record.getLevel().getLocalizedName(), message + ANSI_RESET, throwable);
case "WARNING":
return String.format(format, ANSI_YELLOW, dat, source, record.getLoggerName(),
record.getLevel().getLocalizedName(), message + ANSI_RESET, throwable);
case "SEVERE":
return String.format(format, ANSI_RED, dat, source, record.getLoggerName(),
record.getLevel().getLocalizedName(), message + ANSI_RESET, throwable);
default:
return String.format(format, dat, source, record.getLoggerName(),
record.getLevel().getLocalizedName(), message, throwable);
}
}
}
ANSI Escape in Console plugin(用于Eclipse)。您将需要使用它,以便Eclipse控制台可以解释ANSI Escape代码。 安装并重新启动Eclipse 。
上面的代码已编译并压缩为 .jar文件:
CustomFormatter.java
javac CustomFormatter.java
jar cfv CustomFormatter.jar CustomFormatter.class
创建一个包含类文件的JAR文件,并将其保存在所需的任何文件夹中(例如,在C:\java\CustomFormatter
中)Window --> Preferences --> Ansi Console
并选中Try using the standard error color setting for stderr output
,然后选择Apply and Close
。 编辑logging.properties
文件,该文件位于JRE的lib
文件夹中。您的计算机中可能有多个,您应编辑与Eclipse使用的JRE版本相对应的一个。通过阅读Eclipse中“控制台”选项卡下面的信息,您可以知道正在使用哪个:
logging.properties
。就我而言,我将编辑C:\Program Files\Java\jre1.8.0_231\lib\logging.properties
。 java.util.logging.ConsoleHandler.formatter
的值(在我的情况下是第44行),使其等于CustomFormatter
,完全像这样:java.util.logging.ConsoleHandler.formatter = CustomFormatter
。确保保存更改。 将CustomFormatter.jar
添加为Eclipse中的JRE系统库。
Window --> Preferences --> Java --> Installed JREs
Edit
和Add External JARs...
CustomFormatter.jar
的文件夹并选择它。Finish
和Apply and Close
就是这样。您现在应该为每个Logger级别使用不同的颜色。 INFO为青色,WARNING为黄色,SEVERE为红色。您可以使用corresponding ANSI Color code修改上面的代码,将其更改为所需的颜色。它适用于Java 8和Eclipse 2019-12:
注意::如果正常的标准输出文本显示为蓝色,红色或黄色,请尝试禁用Limit console output
中的Window --> Preferences --> Run/Debug --> Console
答案 2 :(得分:0)
来自 jajube 的精彩回答。我使用 netbeans 8.2。它的控制台有默认的红色文本,但处理 ANSI 代码。我修改了他对下面格式化程序的回答
#include <iostream>
#include <chrono>
#include <gmp.h>
#include <string>
bool mpz_is_divisible(mpz_t n, mpz_t d);
void mpz_sqr(mpz_t res, mpz_t x) {
//computes square of x and puts the result into res
mpz_pow_ui(res, x, 2);
}
//the below function causes stack overflow for large inputs
void smallest_divisor(mpz_t n, mpz_t div, mpz_t div_sqr, mpz_t smallest_div) {
//finds the smallest number which divides n and puts the result into smallest_div
mpz_sqr(div_sqr, div);
if (mpz_cmp(div_sqr, n) > 0) {
mpz_set(smallest_div, n);
return;
}
if (mpz_is_divisible(n, div)) {
mpz_set(smallest_div, div);
return;
}
mpz_add_ui(div, div, 1);
smallest_divisor(n, div, div_sqr, smallest_div); //<-- should do tail recursion optimisation?
}
bool mpz_prime_test_basic(mpz_t n) {
//checks if n is prime
mpz_t div, div_sqr, smallest_div;
mpz_inits(div, div_sqr, smallest_div, NULL);
mpz_set_ui(div, 2);
smallest_divisor(n, div, div_sqr, smallest_div);
if (mpz_cmp(smallest_div, n) == 0) {
mpz_clear(div);
mpz_clear(div_sqr);
mpz_clear(smallest_div);
return true;
}
mpz_clear(div);
mpz_clear(div_sqr);
mpz_clear(smallest_div);
return false;
}
bool mpz_is_divisible(mpz_t n, mpz_t d) {
//checks if n is divisible by d
mpz_t rem;
mpz_init(rem);
mpz_tdiv_r(rem, n, d);
int cmp = mpz_cmp_si(rem, 0); //checks if remainder is equal to 0
if (cmp == 0) return true;
return false;
}
int main() {
std::string num_str;
mpz_t num;
mpz_init(num);
std::cout << "Enter number to check" << '\n';
std::cin >> num_str;
mpz_set_str(num, num_str.c_str(), 10);
bool is_prime = mpz_prime_test_basic(num);
if (is_prime) {
std::cout << num_str << " is a prime\n";
} else {
std::cout << num_str << " is not a prime\n";
}
return 0;
}
它在我在启动时指定的 Logging.properties 中实例化
package net.sf.jaer.util;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.Date;
import java.util.logging.Formatter;
import java.util.logging.LogRecord;
/**
* Based on
* https://stackoverflow.com/questions/54909752/how-to-change-the-util-logging-logger-printing-colour-in-logging-properties
* with ANSI codes from
* https://stackoverflow.com/questions/5762491/how-to-print-color-in-console-using-system-out-println
*
* @author tobid Jan 2021
*/
public class LoggingAnsiColorConsoleFormatter extends Formatter {
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";
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";
private final Date date = new Date();
// FORMAT uses e.g. 2$ which refers to 2nd argument of String.format
// It has two lines: Line 1 is the date and class/method. Line 2 is the LEVEL and message
// Lines are separated by the format spec %n which makes newline
// This format puts date and class/method in CYAN, followed by newline with level colored, followed by default message color
private static final String FORMAT = ANSI_CYAN+"%2$tb %2$td, %2$tY %2$tl:%2$tM:%2$tS %2$Tp %3$s%n%1$s%5$s:" + ANSI_RESET + " %6$s%7$s%n";
// args to String.format
// 1 ansi code
// 2 date
// 3 source (class/method)
// 4 logger name
// 5 level
// 6 message,
// 7 throwable
// output example
// Jan 05, 2021 7:09:55 AM net.sf.jaer.eventprocessing.filter.BackgroundActivityFilter resetFilter
//INFO: resetting BackgroundActivityFilter
@Override
public String format(LogRecord record) {
date.setTime(record.getMillis());
String source;
if (record.getSourceClassName() != null) {
source = record.getSourceClassName();
if (record.getSourceMethodName() != null) {
source += " " + record.getSourceMethodName();
}
} else {
source = record.getLoggerName();
}
String message = formatMessage(record);
String throwable = "";
if (record.getThrown() != null) {
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
pw.println();
record.getThrown().printStackTrace(pw);
pw.close();
throwable = sw.toString();
}
switch (record.getLevel().toString()) {
case "INFO":
return String.format(FORMAT, ANSI_GREEN_BACKGROUND+ANSI_BLACK, date, source, record.getLoggerName(),
record.getLevel().getLocalizedName(), message + ANSI_RESET, throwable);
case "WARNING":
return String.format(FORMAT, ANSI_YELLOW_BACKGROUND+ANSI_BLACK, date, source, record.getLoggerName(),
record.getLevel().getLocalizedName(), message + ANSI_RESET, throwable);
case "SEVERE":
return String.format(FORMAT, ANSI_RED_BACKGROUND + ANSI_WHITE, date, source, record.getLoggerName(),
record.getLevel().getLocalizedName(), message + ANSI_RESET, throwable);
default:
return String.format(FORMAT, date, source, record.getLoggerName(),
record.getLevel().getLocalizedName(), message, throwable);
}
}
}
Logging.properties 有这一行
-Djava.util.logging.config.file=conf/Logging.properties
输出是这样的