为Spring 4 @RequestParam或@PathVariable注册自定义转换器的正确方法是什么

Question

I am trying to figure out what is the "best" or recommended way for customer converters for RequestParams and PathVariables in Spring 4? We have registered our Jackson JSON converters, but they don't work for these parameters, and from reading online I've found about a dozen different answers on what should be done.

I originally thought LocalDateTime would work without a custom converter with the standard ISO format yyyy-MM-ddThh:mm:ss but when I pass that up (2014-12-01T01:01:01) it just throws an exception, and I tried different formats to see if those would work, but so far none of the formats I've tried have worked, so I was going to try a custom converter, but I can't seem to find what the correct way to do that is either.

@RequestMapping(value = "/foo")
@RestController
public class TestController{
    @RequestMapping(value="/test", method=RequestMethod.GET)
    public void test(@RequestParam("stuff") LocalDateTime source) {
        int i = 0;
    }
}

Here is the sample url I tried http://localhost:8081/data/foo/test?start=1986-04-08T12:30:00

Answer 1

The proper formatting for your case would be

@RequestMapping(value="/test", method= RequestMethod.GET)
public void test(@RequestParam("stuff")  @DateTimeFormat(iso=ISO.DATE_TIME) LocalDateTime source) {
    int i = 0;
}

just make sure one thing, in the value you pass and state in your question 2014-12-01T:01:01:01 you have a typo, it should be 2014-12-01T01:01:01 so no semi-colon betweeen T and 01

Answer 2

try checking out the @DateTimeFormat Parameter Annotation which was introduced with Spring 3 Type Conversions and Validations :

@RequestMapping(value = "/appointments/{day}", method = RequestMethod.GET)
public String getAppointmentsForDay(@PathVariable @DateTimeFormat(iso=ISO.DATE) Date day) {
    ...
}