SpringBoot 获取请求参数的常用注解及用法

@GetMapping("/user")
public String getUser(@RequestParam("id") Long userId) {
    return "User ID: " + userId;
}
// 可选参数，设置默认值
@GetMapping("/search")
public String search(@RequestParam(value = "q", required = false, defaultValue = "") String query) {
    return "Search: " + query;
}

@GetMapping("/user/{id}")
public String getUser(@PathVariable("id") Long userId) {
    return "User ID: " + userId;
}
// 当变量名与方法参数名相同时可省略
@GetMapping("/article/{slug}")
public String getArticle(@PathVariable String slug) {
    return "Article: " + slug;
}

@PostMapping("/user")
public String createUser(@RequestBody User user) {
    return "Created user: " + user.getName();
}

@GetMapping("/info")
public String getInfo(@RequestHeader("User-Agent") String userAgent) {
    return "User Agent: " + userAgent;
}

@GetMapping("/home")
public String home(@CookieValue("JSESSIONID") String sessionId) {
    return "Session ID: " + sessionId;
}

@PostMapping("/register")
public String register(@ModelAttribute User user) {
    return "Registered: " + user.getName();
}

@PostMapping("/upload")
public String uploadFile(@RequestPart("file") MultipartFile file) {
    return "Uploaded: " + file.getOriginalFilename();
}

@GetMapping("/example")
public String example(HttpServletRequest request, HttpServletResponse response) {
    String param = request.getParameter("param");
    return "Parameter: " + param;
}

@GetMapping("/params")
public String getAllParams(@RequestParam Map<String, String> allParams) {
    return "All params: " + allParams.toString();
}

@GetMapping("/multiParams")
public String getMultiParams(@RequestParam MultiValueMap<String, String> params) {
    return "Multi params: " + params.toString();
}

@GetMapping("/filter")
public String filterUsers(UserFilter filter) {
    return "Filtering by: " + filter.toString();
}
// UserFilter 类示例
public class UserFilter {
    private String name;
    private Integer age;
    // getters and setters
}