slf4j format 占位符使用{}。

 

For example,

will return the string “Hi there.”.

The {} pair is called the formatting anchor. It serves to designate the location where arguments need to be substituted within the message pattern.

In case your message contains the ‘{‘ or the ‘}’ character, you do not have to do anything special unless the ‘}’ character immediately follows ‘{‘. For example,

will return the string “Set {1,2,3} is not equal to 1,2.”.

If for whatever reason you need to place the string “{}” in the message without its formatting anchor meaning, then you need to escape the ‘{‘ character with ‘\’, that is the backslash character. Only the ‘{‘ character should be escaped. There is no need to escape the ‘}’ character. For example,

will return the string “Set {} is not equal to 1,2.”.

The escaping behavior just described can be overridden by escaping the escape character ‘\’. Calling

 

官方API https://www.slf4j.org/api/org/slf4j/helpers/MessageFormatter.html

 

---