问答平台（1），项目调试

响应状态码的含义

状态代码有三位数字组成，第一个数字定义了响应的类别，分为五类:
    1xx：指示信息--表示请求已接收，继续处理
    2xx：成功--表示请求已被成功接收
    3xx：重定向--要完成请求必须进行更进一步的操作
    4xx：客户端错误--请求有语法错误或请求无法实现
    5xx：服务器端错误--服务器未能实现合法的请求

服务端断点调试

idea调试常用快捷键

F8: 单步调试（逐行），不进入函数内部
F7: 单步调试，进入函数内部
F9: 继续执行，进入下一个断点或执行完程序

客户端断点调试

浏览器开发者工具(Source)

F10: 单步调试（逐行），不进入函数内部
F11: 单步调试，进入函数内部
F8: 执行到底

设置日志级别

将日志输出到不同的终端

配置文件

• logback-spring-develop.xml

  <!-- logback-spring-develop.xml -->
  <?xml version="1.0" encoding="UTF-8"?>
  <configuration>
      <contextName>community</contextName>
      <property name="LOG_PATH" value="D:/work/data"/>
      <property name="APPDIR" value="community"/>
  
      <!-- error file -->
      <appender name="FILE_ERROR" class="ch.qos.logback.core.rolling.RollingFileAppender">
          <file>${LOG_PATH}/${APPDIR}/log_error.log</file>
          <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
              <fileNamePattern>${LOG_PATH}/${APPDIR}/error/log-error-%d{yyyy-MM-dd}.%i.log</fileNamePattern>
              <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                  <maxFileSize>5MB</maxFileSize>
              </timeBasedFileNamingAndTriggeringPolicy>
              <maxHistory>30</maxHistory>
          </rollingPolicy>
          <append>true</append>
          <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
              <pattern>%d %level [%thread] %logger{10} [%file:%line] %msg%n</pattern>
              <charset>utf-8</charset>
          </encoder>
          <filter class="ch.qos.logback.classic.filter.LevelFilter">
              <level>error</level>
              <onMatch>ACCEPT</onMatch>
              <onMismatch>DENY</onMismatch>
          </filter>
      </appender>
  
      <!-- warn file -->
      <appender name="FILE_WARN" class="ch.qos.logback.core.rolling.RollingFileAppender">
          <file>${LOG_PATH}/${APPDIR}/log_warn.log</file>
          <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
              <fileNamePattern>${LOG_PATH}/${APPDIR}/warn/log-warn-%d{yyyy-MM-dd}.%i.log</fileNamePattern>
              <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                  <maxFileSize>5MB</maxFileSize>
              </timeBasedFileNamingAndTriggeringPolicy>
              <maxHistory>30</maxHistory>
          </rollingPolicy>
          <append>true</append>
          <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
              <pattern>%d %level [%thread] %logger{10} [%file:%line] %msg%n</pattern>
              <charset>utf-8</charset>
          </encoder>
          <filter class="ch.qos.logback.classic.filter.LevelFilter">
              <level>warn</level>
              <onMatch>ACCEPT</onMatch>
              <onMismatch>DENY</onMismatch>
          </filter>
      </appender>
  
      <!-- info file -->
      <appender name="FILE_INFO" class="ch.qos.logback.core.rolling.RollingFileAppender">
          <file>${LOG_PATH}/${APPDIR}/log_info.log</file>
          <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
              <fileNamePattern>${LOG_PATH}/${APPDIR}/info/log-info-%d{yyyy-MM-dd}.%i.log</fileNamePattern>
              <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                  <maxFileSize>5MB</maxFileSize>
              </timeBasedFileNamingAndTriggeringPolicy>
              <maxHistory>30</maxHistory>
          </rollingPolicy>
          <append>true</append>
          <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
              <pattern>%d %level [%thread] %logger{10} [%file:%line] %msg%n</pattern>
              <charset>utf-8</charset>
          </encoder>
          <filter class="ch.qos.logback.classic.filter.LevelFilter">
              <level>info</level>
              <onMatch>ACCEPT</onMatch>
              <onMismatch>DENY</onMismatch>
          </filter>
      </appender>
  
      <!-- console -->
      <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
          <encoder>
              <pattern>%d %level [%thread] %logger{10} [%file:%line] %msg%n</pattern>
              <charset>utf-8</charset>
          </encoder>
          <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
              <level>debug</level>
          </filter>
      </appender>
  
      <logger name="com.nowcoder.community" level="debug"/>
  
      <root level="info">
          <appender-ref ref="FILE_ERROR"/>
          <appender-ref ref="FILE_WARN"/>
          <appender-ref ref="FILE_INFO"/>
          <appender-ref ref="STDOUT"/>
      </root>
  
  </configuration>

测试类

// LoggerTests.java
@RunWith(SpringRunner.class)
@SpringBootTest
@ContextConfiguration(classes = CommunityApplication.class)
public class LoggerTests {

    private static final Logger logger = LoggerFactory.getLogger(LoggerTests.class);

    @Test
    public void testLogger() {
        System.out.println(logger.getName());

        logger.debug("debug log");
        logger.info("info log");
        logger.warn("warn log");
        logger.error("error log");
    }
}

参考资料

• https://logback.qos.ch