Update 73.1.1 Configure logback for file only output.md

Author: qibaoguang

IX. ‘How-to’ guides/73.1.1 Configure logback for file only output.md

@@ -1 +1,18 @@
-###73.1.1 Configure logback for file only output
+###73.1.1 配置logback只输出到文件
+
+如果想禁用控制台日志记录，只将输出写入文件中，你需要一个只导入`file-appender.xml`而不是`console-appender.xml`的自定义`logback-spring.xml`：
+```xml
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <include resource="org/springframework/boot/logging/logback/defaults.xml" />
+    <property name="LOG_FILE" value="${LOG_FILE:-${LOG_PATH:-${LOG_TEMP:-${java.io.tmpdir:-/tmp}}/}spring.log}"/>
+    <include resource="org/springframework/boot/logging/logback/file-appender.xml" />
+    <root level="INFO">
+        <appender-ref ref="FILE" />
+    </root>
+</configuration>
+```
+你还需要将`logging.file`添加到`application.properties`：
+```properties
+logging.file=myapplication.log
+```