Spring Boot执行器endpoint的漂亮打印JSON输出

Question

Spring Boot Actuctor提供了几个endpoint来监控应用程序：

/metrics
/beans
/health
...

使用以下方法检查endpoint：

curl http://localhost:8080/metrics

结果如下：

{"counter.status.200.env":1,"counter.status.200.health":1,"counter.status.200.info":2,"counter.status.200.metrics":2,"gauge.response.env":5.0,"gauge.response.health":22.0,"gauge.response.info":1.0,"gauge.response.metrics":1.0,"mem":1030144,"mem.free":56118,"processors":8,"uptime":5108095,"instance.uptime":5102906,"heap.committed":1030144,"heap.init":262144,"heap.used":974031,"heap":3728384,"threads.peak":81,"threads.daemon":21,"threads":77,"classes":8854,"classes.loaded":8860,"classes.unloaded":6,"gc.ps_scavenge.count":119,"gc.ps_scavenge.time":7223,"gc.ps_marksweep.count":12,"gc.ps_marksweep.time":17573}

这对机器消费很好，但人类很难读懂。

我想对Spring Boot执行器endpoint的JSON输出进行格式化（即漂亮的打印），以使操作人员更容易阅读它们。

{
  "counter.status.200.env":1,
  "counter.status.200.health":1,
  "counter.status.200.info":2,
  "counter.status.200.metrics":2,
  "gauge.response.env":5.0,
  "gauge.response.health":22.0,
  "gauge.response.info":1.0,
  ...
}

我试过设置

http.mappers.json-pretty-print=true 

但此设置并不影响执行器的输出。

是否有一个配置来启用Spring Boot执行器JSON输出的漂亮打印？

更新：

http.mappers.jsonPrettyPrint=true

同时，我使用json pretty print命令行作为解决办法：

安装jsonpp（例如，对于OS X）：

brew install jsonpp

然后通过jsonpp管道输出curl,该jsonpp实时格式化json文件：

curl http://localhost:8080/metrics | jsonpp

{
  "counter.status.200.env": 1,
  "counter.status.200.health": 1,
  "counter.status.200.info": 2,
  "counter.status.200.metrics": 2,
  ...
}

Answer 1

根据http://docs.Spring.io/spring-boot/docs/current/reference/html/howto-spring-mvc.html#howto-customize-the-jackson-objectmapper，在Spring Boot（至少1.2.2）中使用Jackson启用漂亮打印的正式方法是设置以下属性：

 # Pretty-print JSON responses
 spring.jackson.serialization.indent_output=true