修改 application.yml

server:
  tomcat:
    uri-encoding: UTF-8
spring:
  http:
    encoding:
      charset: utf-8
      enabled: true
      force: true

修改 application.properties

spring.http.encoding.force=true
spring.http.encoding.charset=UTF-8
spring.http.encoding.enabled=true
server.tomcat.uri-encoding=UTF-8