在SpringMVC框架中，@RequestMapping 用于映射HTTP请求到控制器类或控制器类中方法。
这个注解可以应用在类级别或方法级别上。

使用样例

包含路径变量和HTTP方法：

@Controller
@RequestMapping("/api/v1")
public class MyApiController {@GetMapping("/users/{userId}")public ResponseEntity<User> getUser(@PathVariable("userId") Long id) {User user = userService.findById(id);if (user == null) {return ResponseEntity.notFound().build();}return ResponseEntity.ok(user);}@PostMapping("/users")public ResponseEntity<User> createUser(@RequestBody User newUser) {User createdUser = userService.createUser(newUser);return ResponseEntity.created(URI.create("/api/v1/users/" + createdUser.getId())).body(createdUser);}@PutMapping("/users/{userId}")public ResponseEntity<User> updateUser(@PathVariable("userId") Long id, @RequestBody User updatedUser) {// 更新用户逻辑...return ResponseEntity.ok(updatedUser);}@DeleteMapping("/users/{userId}")public ResponseEntity<Void> deleteUser(@PathVariable("userId") Long id) {userService.deleteById(id);return ResponseEntity.noContent().build();}
}

结合路径变量、请求参数和查询参数：

@Controller
@RequestMapping("/orders")
public class OrderController {@GetMapping("/{id}")public String getOrderDetails(@PathVariable("id") Long orderId,@RequestParam(name = "includeHistory", required = false, defaultValue = "false") boolean includeHistory) {// 获取订单详情以及根据请求参数决定是否包含历史记录...return "order-details";}
}

包含请求参数和header：

@Controller
@RequestMapping("/search")
public class SearchController {@GetMappingpublic String search(@RequestParam(value = "q", required = false, defaultValue = "") String query,@RequestHeader(value = "X-Search-Preferences", required = false) String preferences) {// 搜索逻辑，基于query参数和header中的偏好信息...return "search-results";}
}

使用Ant风格路径匹配：

@Controller
@RequestMapping("/documents/**")
public class DocumentController {@GetMappingpublic String listDocuments() {// 列出所有文档逻辑...return "document-list";}@GetMapping("/{docId}")public String viewDocument(@PathVariable("docId") String docId) {// 查看特定文档逻辑...return "document-view";}
}

处理不同请求头和媒体类型的请求：

@Controller
@RequestMapping("/api")
public class MediaTypeController {@GetMapping(path = "/data", produces = "application/json")public MyData getJsonData() {// 返回JSON格式的数据...return new MyData();}@GetMapping(path = "/data", produces = "application/xml")public MyData getXmlData() {// 返回XML格式的数据...return new MyData();}@PostMapping(path = "/upload", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)public ResponseEntity<String> handleFileUpload(@RequestParam("file") MultipartFile file) {// 处理文件上传逻辑...return ResponseEntity.ok("File uploaded successfully");}
}