如何使用java spring验证来验证字符串长度？

import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;

import javax.validation.Valid;
import javax.validation.constraints.Size;

@RestController
@Validated
public class MyController {

    @PostMapping("/validate")
    public String validateString(@RequestBody @Valid @Size(min = 2, max = 10) String input, BindingResult bindingResult) {
        if (bindingResult.hasErrors()) {
            // 处理验证错误，例如返回错误信息
            return bindingResult.getAllErrors().get(0).getDefaultMessage();
        }

        // 验证通过，进行其他操作
        return "Validation passed";
    }
}