CODEWITHSUNDEEP
spring-mvc
Phương Nguyễn
Phương Nguyễn

Reputation: 8905

Ordered RequestMapping in spring MVC

I'm working on a Spring MVC project using Annotated Controller. One thing that I'm interested in is about the order which @RequestMapping instruction to be processed. For example, I want all /green/basic/welcome to be mapped to GreenController.welcome() but green/{treeId}/{treeName} to be mapped to GreenController.viewTree(treeId, treeName).

I guess I need to specify two @RequestMapping with @RequestMapping of /green/basic/welcome to be processed first, so that it won't be interpreter as a call to GreenControllerviewTree("basic", "welcome").

Can you guys guide me on that?

Upvotes: 10

Views: 5893

Answers (1)

yincrash
yincrash

Reputation: 6474

An exact match for a RequestMapping will take precedence over one with a PathVariable. So you would have two request mappings like you pointed out. One to handle the specific url, and the variable version will catch everything else. Spring checks for direct path matches before checking for path variable matches, so order does not matter unless you have two request mappings with the same number of path variables, which may spit out an IllegalStateException

Check the source of org.springframework.web.servlet.handler.AbstractHandlerMethodMapping for the specifics. It is handled in lookupHandlerMethod().

To determine the best match of two RequestMappings that aren't exact matches, the compareTo() method of RequestMappingInfo is used.

Upvotes: 10

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