This annotation works exactly the same as @RequestMapping in Spring. Here are the annotations in Spring:

Click @path of the exercise code in Eclipse:

Find that the value of this path also supports regular expressions:

So I used a regular expression like this:

Test success:

Use this test fails, this is my expectations: http://localhost:9498//hello/3 also found from the output of the Eclipse framework parses the @ the entrance code of Path, kill two birds with one stone. After the entry method sets the breakpoint,

Then you can debug:

How is a regular expression evaluated

The regular expressions we specify in our application code will have to be used by the framework somewhere, so we can already set breakpoint debug: This is how we apply the specified regular expressions:

Here’s the path I’m testing passed :/3. Obviously the match() method of the regular expression instance returns false,

So finally, 404 error,

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