has been deprecated because it is a versioned formula!

时间: 2024-06-04 12:11:10 浏览: 83

[] - 2022-05-28 @RequestBody 接收数组、List 参数、@Deprecated 标记废弃方法.pdf

RequestBody 注解。 * 如果是整形 List，则换成 List<Integer> ids 即可。 * @return */@PostMapping("save2")public String save2(@RequestBody List<String> ids) { logger.info("save2--->" + ids); return new Date() + "传输完毕：" + ids;}在前端的 AJAX 请求中，你可以将数据包装成 JSON 对象，如： ```javascript var data = ["18ui", "89uj", "987u", "98uj"]; // 如果后台接收的是整形 List，则 data 中使用整形即可，如：data = [80, 90, 100, 110, 120]; $.ajax({ // 默认传输的内容类型为 key-value 型,后台使用数组、List 接收参数时, // headers 中必须指定内容类型为 json 类型，否则会报415错误 headers: { 'Content-Type': 'application/json' }, type: "post", url: "http://localhost:8080/user/save2", // 指定 json 类型后，传输的数据理所当然应该是 json 格式。 data: JSON.stringify(data), success: function (data) { console.log(data); }, error: function (data) { console.log("ERROR:" + JSON.stringify(data)); } }); ``` 关于 `@Deprecated` 标记废弃方法：在 Java 中，`@Deprecated` 是一个元注解，用于标记某个类、接口、方法或字段已经过时，不再推荐使用。这样做是为了提醒开发者，这些被标记的元素在未来可能被移除或者改变，因此应该避免继续使用。当使用了 `@Deprecated` 的方法时，编译器通常会发出警告信息。例如，假设我们有一个旧的方法 `oldMethod()`，现在我们想要弃用它，可以这样标记： ```java @Deprecated public void oldMethod() { // 方法实现 } ``` 在新的版本中，我们可以提供一个新的替代方法 `newMethod()`，并鼓励开发者使用这个新方法： ```java public void newMethod() { // 新方法实现 } ``` 在实际开发中，我们经常会在弃用旧方法的同时，添加注释说明替代的新方法，以帮助开发者平滑地过渡到新的API。总结一下，本篇内容主要讲解了以下几个知识点： 1. `@RequestBody` 注解在 Spring MVC 中的作用，主要用于接收前端以 JSON 格式发送的请求体数据。`required` 属性用于指定参数是否为必传，默认为 `true`。 2. GET 请求不携带请求体，因此 `@RequestBody` 不能用于 GET 方法，通常配合 POST 请求使用。 3. `@RequestBody` 和 `@RequestParam` 可以在同一个方法中混用，前者用于接收整个请求体的数据，后者用于接收请求参数中的键值对。 4. 使用 `@RequestBody` 接收数组或 List 参数时，前端需要设置请求头 `Content-Type` 为 `application/json`，并将数据序列化为 JSON 格式。 5. `@Deprecated` 注解的使用，用于标记过时的类、接口、方法或字段，提示开发者不要继续使用，并可能提供替代方案。这些知识点在实际的 Web 开发中非常重要，能够帮助开发者更好地处理前后端数据交互和代码维护。

As an AI language model, I am not sure what you are referring to as I need more information to provide a specific answer. However, deprecation refers to the process of phasing out or discontinuing a software feature or function. This means that the feature or function is no longer supported or recommended for use in future versions of the software. When a formula is versioned, it means that it is tied to a specific version of the software and may not be compatible with future versions. In this case, it is possible that the formula has been deprecated because it is no longer compatible with the current version of the software. It is recommended to update the formula to ensure compatibility with the latest version of the software.

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has been deprecated because it is a versioned formula!

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