使用 Camel 简单表达式语言

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Cloud Integration支持 在 Camel 简单表达式语言中定义的表达式

配置以下组件时，可以使用 Camel 简单表达式语言：

支持 Camel 简单表达式语言的组件元件 使用骆驼简单表达式 更多信息

内容修饰符	定义： 邮件正文 邮件头 交换属性 (类型参数设置为表达式)	定义内容修饰符
写入变量	定义一个变量。 (类型参数设置为表达式)	定义写入变量
路由器	定义路由条件。 (表达式类型参数设置为非 XML)	定义路由器
内容过滤器	定义 XPath 元素的条件。 若要查看一些示例，请参阅示例。	定义过滤器

表达式示例

exchangeId	Exchange Id.	${exchangeId}
id	Message Id	${id}
body	Incoming message body	${body}
in.body	Incoming message body	${in.body} This expression is deprecated from Apache Camel version 3.12.x.
bodyAs(<class>	Message body converted to compatible class	${bodyAs(String)}
mandatoryBodyAs(<class>)	Message body is Mandatory converted to compatible class	${mandatoryBodyAs(String)}
in.header.fo	Refers to foo (forward declaration) in header	${in.header.mandatory.length}
in.header.foo.OGNL	Refers to foo (forward declaration) in header with OGNL (Object-Graph Navigation Language) expresssion	${in.header.fname.split(',')[0]}
headerAs(<key>,<class>	Refers to header with name converted to compatible class<key>	${headerAs(name, String)}
property.foo	Refers to foo (forward declaration) in exchange property	${property.token.length}
property.foo.OGNL	Refers to foo (forward declaration) in exchange property with OGNL (Object-Graph Navigation Language) expresssion	${property.token.split(',')[0]}
sys.foo	Refers to foo (forward declaration) in system (runtime container)	${sys.file.separator}
sysenv.foo	Refers to foo (forward declaration) in system enviroment	${sysenv.property1}
date:<command>:<pattern>	Creates date specified in command and uses notationSimpleDateFormat	Processed at ${date:now-2h} Othe rexample: To write the current timestamp into a message header, define a header with the following value (and Type set to Expression😞 ${date:now:yyyy-MM-dd HH:mm:ss}
date-with-timezone:<command>:<timezone>:<pattern>	Same as , but with timezonedate	Expires at ${date-with-timezone:now+2h30m:IST:yyyy-MM-dd'T'HH:mm:ss.SSSZ}