How does the java third-party interface receive parameter information?

The Java third-party interface receives parameter information in two ways: Request parameters: stored in the HTTP request, including query string and request body. Path parameters: Embedded in the URI path, parsed by the server and passed to interface methods.

Java third-party interface receives parameter information

How to receive parameter information?

The Java third-party interface can receive parameter information in the following two ways:

• Request Parameters: stored in the HTTP request In the request line or request body, received and parsed by the server.
• Path Parameters: Placeholders embedded in the URI path, parsed by the server and passed to the interface method.

Request parameters

• GET request: Parameters are appended to the end of the URL as query strings, for example: https://example.com/api/users?name=John&age=30
• POST request: Parameters are included in the request body, usually in JSON or XML format, e.g. ：{"name": "John", "age": 30}

Path parameter

• The parameter is as Placeholders are included in the URI path, for example: https://example.com/api/users/{userId}
• The placeholder name is usually the same as the parameter name in the interface method Correspondingly, for example: @PathVariable("userId") Long userId

Receive request parameters

<code class="java">@PostMapping("/users")
public User createUser(@RequestBody User user) {
    // user 参数从请求正文中解析出来
}</code>

<code class="java">@GetMapping("/users")
public List<User> findUsers(@RequestParam String name, @RequestParam Integer age) {
    // name 和 age 参数从查询字符串中解析出来
}</code>

Receive path Parameter

<code class="java">@GetMapping("/users/{userId}")
public User findUserById(@PathVariable("userId") Long userId) {
    // userId 参数从 URI 路径解析出来
}</code>

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