java - 如何添加多个查询参数不同的 RestController 端点？

Question

如果缺少特定的查询参数，我如何简单地重定向 url？

@RestController
public class PersonController {
    //only in case the "sort" query parameter is missing
    @GetMapping("/persons")
    public String unsorted() {
         return "redirect:/persons?sort=name";
    }

    //only in case the "sort" query parameter exists
    @GetMapping("/persons")
    public String sorted() {
         //...
    }
}

Answer 1

• 使用@RequestParam提取查询参数
• 为@RequestParam 添加参数:value、defaultValue、required

使用 java >= 8:

@RestController
public class PersonController {
     @GetMapping("/persons")
     public String personList(@RequestParam(value = "sort", defaultValue = "name") Optional<String> sort) {
         //handling process here
     }
}

使用 java < 8:

@RestController
public class PersonController {
     @GetMapping("/persons")
     public String personList(@RequestParam(value = "sort", defaultValue = "name", required=false) String sort) {
         //handling process here
     }
}