spring boot 学习笔记（006）log

spring boot的log输出，默认不会输出到控制台上。

spring boot配置log4j，好久都没配置成功。

后来网上查到这么一句话：

Logback是log4j框架的作者开发的新一代日志框架，它效率更高、能够适应诸多的运行环境，同时天然支持SLF4J。

好吧，既然是更新更牛x的一个东东，那我们就学着用用呗。

1，在resources目录下，新建：logbak.xml文件

<!-- Logback configuration. See http://logback.qos.ch/manual/index.html -->  <configuration scan="true" scanPeriod="10 seconds">    <!-- Simple file output -->    <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">      <!-- encoder defaults to ch.qos.logback.classic.encoder.PatternLayoutEncoder -->      <encoder>          <pattern>              [ %-5level] [%date{yyyy-MM-dd HH:mm:ss}] %logger{96} [%line] - %msg%n          </pattern>        <!-- 此处设置字符集 -->        <charset>UTF-8</charset>    </encoder>        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">        <!-- rollover daily 配置日志所生成的目录以及生成文件名的规则 -->        <fileNamePattern>logs/mylog-%d{yyyy-MM-dd}.%i.log</fileNamePattern>        <timeBasedFileNamingAndTriggeringPolicy            class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">          <!-- or whenever the file size reaches 64 MB -->          <maxFileSize>64 MB</maxFileSize>      </timeBasedFileNamingAndTriggeringPolicy>      </rollingPolicy>      <filter class="ch.qos.logback.classic.filter.ThresholdFilter">        <level>DEBUG</level>      </filter>      <!-- Safely log to the same file from multiple JVMs. Degrades performance! -->      <prudent>true</prudent>    </appender>        <!-- Console output -->    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">      <!-- encoder defaults to ch.qos.logback.classic.encoder.PatternLayoutEncoder -->        <encoder>            <pattern>                [ %-5level] [%date{yyyy-MM-dd HH:mm:ss}] %logger{96} [%line] - %msg%n            </pattern>          <!-- 此处设置字符集 -->            <charset>UTF-8</charset>      </encoder>      <!-- Only log level WARN and above -->      <filter class="ch.qos.logback.classic.filter.ThresholdFilter">        <level>DEBUG</level>      </filter>    </appender>        <!-- Enable FILE and STDOUT appenders for all log messages.         By default, only log at level INFO and above. -->    <root level="INFO">      <appender-ref ref="FILE" />      <appender-ref ref="STDOUT" />    </root>      <!-- For loggers in the these namespaces, log at all levels. -->    <logger name="pedestal" level="ALL" />    <logger name="hammock-cafe" level="ALL" />    <logger name="user" level="ALL" />  </configuration>  

2，在HelloWorld.java中，添加log输出：

package springboot;import java.util.logging.Level;import java.util.logging.Logger;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.EnableAutoConfiguration;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestBody;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.ResponseBody;import org.springframework.web.bind.annotation.RestController;@RestController@Controller@EnableAutoConfiguration@SpringBootApplicationpublic class HelloWorld {private static Logger logger = Logger.getLogger(HelloWorld.class.getName()); public static void main(String[] args) {//第一个简单的应用，          SpringApplication.run(HelloWorld.class,args);}@RequestMapping("/hello")      @ResponseBody      public String hello(){logger.log(Level.INFO, "just test the log. (/hello)");        return "Hello World";      }  @RequestMapping("/rundemo")      @ResponseBody      public UserInfo demo(){logger.log(Level.INFO, "just test the log. (/rundemo)");UserInfo u = new UserInfo();u.setUserCode("h001");u.setUserName("u name");u.setDeptCode("ab001");        return u;      }  @RequestMapping(value="/trequest", method = RequestMethod.POST)  @ResponseBody    public UserInfo trequest(@RequestBody UserInfo pu){logger.log(Level.INFO, "just test the log. (/trequest)");UserInfo u = new UserInfo();u.setUserCode(pu.getUserCode());u.setUserName(pu.getUserName());u.setDeptCode(pu.getDeptCode());return u;    }}

在控制台上就看到log输出了。

不过log研究只是个半拉子，还有很多东西没搞透。先解决有无问题，后面再深入研究。