Java – Slf4j在控制台上不显示：

huangapple
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英文:

Java - Slf4j not showing on the console :

问题

  1. 我正在尝试在控制台上显示这个日志信息 log.info("String is:" + str1); 但是根本没有显示，如何在控制台上显示 log.info 信息？
  3. @Slf4j
  4. @RequiredArgsConstructor
  5. @Component
  6. public class TTD {
  8. public ResponseEntity<InputStreamResource> transform() {
  11.     try {
  12.         ObjectMapper mapper = new ObjectMapper();
  13.         Jsonb jsonb = JsonbBuilder.create();
  15.         EcrionIntegration ei = new EcrionIntegration();
  16.         ei.setHelloWord("Hello Sharon");
  18.         String str1 = mapper.writeValueAsString(ei);
  20.         log.info("String is:" + str1);
  22.     } catch (Exception ex) {
  24.         throw new RuntimeException(ex);
  25.     }
  26. }
  27. }
  29. 控制台显示的是附带的图片：
  31. [附件中的控制台][1]
  34.   [1]: https://i.stack.imgur.com/mwVFy.png
英文:

I am trying to display this log.info("String is:"+str1); on the console but it doesn't show at all, how do I display log.info on the console?

  1. @Slf4j
  2. @RequiredArgsConstructor
  3. @Component
  4. public class TTD {
  6. public ResponseEntity&lt;InputStreamResource&gt; transform() {
  9.     try {
  10.         ObjectMapper mapper = new ObjectMapper();
  11.         Jsonb jsonb = JsonbBuilder.create();
  13.         EcrionIntegration ei = new EcrionIntegration();
  14.         ei.setHelloWord(&quot;Hello Sharon&quot;);
  17.         String str1 = mapper.writeValueAsString(ei);
  19.         log.info(&quot;String is:&quot;+str1);
  21.     } catch (Exception ex) {
  23.         throw new RuntimeException(ex);
  24.     }
  25. }

The console is displaying the attached image:

The console without the logs

答案1

得分: 1

以下是翻译好的内容：

不需要拥有 log4j.xml 或 logback.xml 文件进行日志配置。

如果你在使用 Lombok 导入 Slf4j，请确保在你的 pom.xml 文件中添加以下依赖项：

  1. <dependency>
  2.   <groupId>org.projectlombok</groupId>
  3.   <artifactId>lombok</artifactId>
  4.   <version>1.18.24</version>
  5. </dependency>
  7. <dependency>
  8.   <groupId>org.slf4j</groupId>
  9.   <artifactId>slf4j-api</artifactId>
  10.   <version>1.7.26</version>
  11. </dependency>
  13. <dependency>
  14.   <groupId>org.slf4j</groupId>
  15.   <artifactId>slf4j-simple</artifactId>
  16.   <version>1.7.21</version>
  17. </dependency>
英文:

It is not required to have a log4j.xml or logback.xml files for logging configuration.

If you are importing Slf4j with Lombok, make sure you have the following dependencies in your pom.xml file:

  1. &lt;dependency&gt;
  2.   &lt;groupId&gt;org.projectlombok&lt;/groupId&gt;
  3.   &lt;artifactId&gt;lombok&lt;/artifactId&gt;
  4.   &lt;version&gt;1.18.24&lt;/version&gt;
  5. &lt;/dependency&gt;
  7. &lt;dependency&gt;
  8.   &lt;groupId&gt;org.slf4j&lt;/groupId&gt;
  9.   &lt;artifactId&gt;slf4j-api&lt;/artifactId&gt;
  10.   &lt;version&gt;1.7.26&lt;/version&gt;
  11. &lt;/dependency&gt;
  13. &lt;dependency&gt;
  14.   &lt;groupId&gt;org.slf4j&lt;/groupId&gt;
  15.   &lt;artifactId&gt;slf4j-simple&lt;/artifactId&gt;
  16.   &lt;version&gt;1.7.21&lt;/version&gt;
  17. &lt;/dependency&gt;

答案2

得分: -1

你需要在资源文件夹中创建一个配置文件，其中包含标准输出（STDOUT）的追加器。

例如：

  1. log4j.xml
  1. <configuration>
  2.   <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
  3.     <encoder>
  4.       <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
  5.     </encoder>
  6.   </appender>
  7.  
  8.   <root level="debug">
  9.     <appender-ref ref="STDOUT" />
  10.   </root>
  11. </configuration>

或者在 application.properties 文件中，例如：

  1. log4j.appender.consoleAppender=org.apache.log4j.ConsoleAppender
  2. log4j.appender.consoleAppender.layout=org.apache.log4j.PatternLayout
  3. log4j.appender.consoleAppender.layout.ConversionPattern=[%t] %-5p %c %x - %m%n
英文:

You need a configuration file in your resources folder with STDOUT appender.

For example:

  1. log4j.xml
  1. &lt;configuration&gt;
  2.   &lt;appender name=&quot;STDOUT&quot; class=&quot;ch.qos.logback.core.ConsoleAppender&quot;&gt;
  3.     &lt;encoder&gt;
  4.       &lt;pattern&gt;%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n&lt;/pattern&gt;
  5.     &lt;/encoder&gt;
  6.   &lt;/appender&gt;
  7.  
  8.   &lt;root level=&quot;debug&quot;&gt;
  9.     &lt;appender-ref ref=&quot;STDOUT&quot; /&gt;
  10.   &lt;/root&gt;
  11. &lt;/configuration&gt;

Or in application.properties file, eg:

  1. log4j.appender.consoleAppender=org.apache.log4j.ConsoleAppender
  2. log4j.appender.consoleAppender.layout=org.apache.log4j.PatternLayout
  3. log4j.appender.consoleAppender.layout.ConversionPattern=[%t] %-5p %c %x - %m%n

答案3

得分: -1

你需要在 XML 文件的 <configuration>...</configuration> 内部添加以下行：
ref="CONSOLE" 将帮助在控制台上打印。

  1. <root>
  2.     <level value="INFO" />
  3.     <appender-ref ref="CONSOLE" />
  4.     <appender-ref ref="FILE" />
  5. </root>
英文:

You need to add the below line in your XML file inside <configuration>...</configuration>
ref="CONSOLE" will help to print on console.

  1.     	&lt;root&gt;
  2.     		&lt;level value=&quot;INFO&quot; /&gt;
  3.     		&lt;appender-ref ref=&quot;CONSOLE&quot; /&gt;
  4. 			&lt;appender-ref ref=&quot;FILE&quot; /&gt;
  5.     	&lt;/root&gt;

huangapple
  • 本文由 发表于 2020年8月19日 22:42:10
  • 转载请务必保留本文链接：https://go.coder-hub.com/63489477.html
  • java
  • logging
  • lombok
  • slf4j
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