【RestTemplete】使用RestTemplete传Json或者 {} 报错--解决

https://jira.spring.io/browse/SPR-9220?focusedCommentId=76760&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-76760

https://stackoverflow.com/questions/43252750/how-to-send-json-as-a-parameter-in-url-using-spring-resttemplate