英文:
What is the difference between parameters in spring boot?
问题
我需要在控制器的@RequestMapping中处理不同类型的参数。例如，你如何区分以下路径：
/posts
/posts/1
/posts&userId=1
前两者之间似乎可以工作，但调用第三者会导致“模糊映射”错误。
以下是控制器代码：
@RequestMapping(value= {"/posts", "/posts/{numberOfPosts}"})
public String getBlogPosts(@PathVariable Optional<Integer> numberOfPosts) { //为了防止“模糊映射”错误
if (numberOfPosts.isPresent()) {
return blogService.getUserBlogPosts(numberOfPosts);
}
else {
return blogService.getAllBlogPosts();
}
}
以下是第三者：
@RequestMapping("/posts")
public String getUserIdPosts(@RequestParam int userId) {
return blogService.getUserIdPosts(userId);
}
我该如何处理第三个问题？
英文:
I'm required to handle different types of parameters in the @RequestMapping of the controller. For example, how do you differentiate between
/posts
/posts/1
/posts&userId=1
This seems to work between the first two but calling the third one results in "Ambiguous mapping" error.
Here is the controller code:
@RequestMapping(value= {"/posts", "/posts/{numberOfPosts}"})
public String getBlogPosts(@PathVariable Optional<Integer> numberOfPosts) { //to prevent "Ambiguous mapping" error
if (numberOfPosts.isPresent()) {
return blogService.getUserBlogPosts(numberOfPosts);
}
else {
return blogService.getAllBlogPosts();
}
}
Here is the third one:
@RequestMapping("/posts")
public String getUserIdPosts(@RequestParam int userId) {
return blogService.getUserIdPosts(userId);
//return blogService.getUserBlogPosts(numberOfPosts);
}
How do I handle the third one?
答案1
得分: 0
/path和/post&userId=1 的路径映射是相同的：/post`。
您可以通过在代码中对 userId 变量进行测试来区分这两个 URL，示例如下：
@RequestMapping(value= {"/posts", "/posts/{numberOfPosts}"}, method = RequestMethod.GET)
public String getBlogPosts(@PathVariable(required = false) Optional<Integer> numberOfPosts, @RequestParam(required = false) Integer userId) {
if (numberOfPosts.isPresent()) {
return blogService.getUserBlogPosts(numberOfPosts);
}
else if(userId == null) {
return blogService.getAllBlogPosts();
} else {
return blogService.getUserIdPosts(userId);
}
}
别忘了通过在上述注解中添加 required = false，使请求的参数 userId 和路径变量 numberOfPosts 成为可选项。
英文:
The path mapping for /post and /post&userId=1 are the same: /post.
You can handle make the difference between these two URLs in your code by testing on the userId variable like below:
@RequestMapping(value= {"/posts", "/posts/{numberOfPosts}"}, method = RequestMethod.GET)
public String getBlogPosts(@PathVariable(required = false) Optional<Integer> numberOfPosts, @RequestParam(required = false) Integer userId) {
if (numberOfPosts.isPresent()) {
return blogService.getUserBlogPosts(numberOfPosts);
}
else if(userId == null) {
return blogService.getAllBlogPosts();
} else {
return blogService.getUserIdPosts(userId);
}
}
Don't forger to make the requested parameter userId and the path variable numberOfPosts optional by adding required = false to the above annotations.
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