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spring | @RequestParam
source link: https://benpaodewoniu.github.io/2023/01/30/spring40/
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spring | @RequestParam
@RequestParam 总体上来说，该注解类拥有三个参数：
value、name属性都标识请求参数名（必须配置）;required：参数是否必传，默认为true，可以设置为非必传false；（如果设置了必传或默认，请求未传递参数，将会抛出异常）;defaultValue：参数默认值，如果设置了该值，required将会自动设置为false；
Spring 中的 @RequestParam 注解接收的参数大多数场景是来自 requestHeaders 中，即请求头，也就是 url 中，格式为：http://localhost:8080?name=yc&age=23，由于 url 长度有限制，所以参数需要限制数量和值得长度；
@RequestMapping(value = "/test", method = RequestMethod.GET)
public void test(@RequestParam("id") Integer id,
@RequestParam("name") String name,
@RequestParam("age") Integer age) {
log.info("id = {}, name = {}, age = {}", id, name, age);
}
id = 1, name = yc, age = 23
不使用 @RequestParam 注解直接进行对象属性赋值
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
private Integer id;
private String name;
private Integer age;
}
@RequestMapping(value = "/test", method = RequestMethod.GET)
public void test(User user) {
log.info("id = {}, name = {}, age = {}", user.getId(), user.getName(), user.getAge());
}
id = 1, name = yc, age = 23Recommend
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