Spring MVC 响应机制综合实践之页面、数据、JSON 与响应配置处理方法

@Bean
public ViewResolver viewResolver() {
    InternalResourceViewResolver resolver = new InternalResourceViewResolver();
    resolver.setPrefix("/WEB-INF/views/");
    resolver.setSuffix(".jsp");
    return resolver;
}

@GetMapping("/text")
@ResponseBody
public String rawText() {
    return "<h1>Hello World</h1>";
}

@GetMapping("/user")
public User getUser() {
    return new User("Alice", 25);
}

public class User {
    @JsonProperty("username")
    private String name;
    @JsonIgnore
    private String password;
}

@GetMapping("/custom")
public ResponseEntity<String> customResponse() {
    HttpHeaders headers = new HttpHeaders();
    headers.add("X-Custom-Header", "value");
    return new ResponseEntity<>("Custom Body", headers, HttpStatus.CREATED);
}

@GetMapping("/redirect")
public String redirect() {
    return "redirect:/new-url";
}

@ControllerAdvice
public class GlobalResponseHandler implements ResponseBodyAdvice<Object> {
    @Override
    public boolean supports(MethodParameter returnType, Class<? extends HttpMessageConverter<?>> converterType) {
        return true;
    }
    @Override
    public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType, 
                                  Class<? extends HttpMessageConverter<?>> selectedConverterType, 
                                  ServerHttpRequest request, ServerHttpResponse response) {
        return new ResponseWrapper<>(200, "success", body);
    }
}

@Configuration
public class WebConfig implements WebMvcConfigurer {
    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/api/**")
                .allowedOrigins("*")
                .allowedMethods("GET", "POST");
    }
}

@ControllerAdvice
public class GlobalExceptionHandler {
    @ExceptionHandler(Exception.class)
    public ResponseEntity<ErrorResponse> handleException(Exception ex) {
        ErrorResponse error = new ErrorResponse(500, ex.getMessage());
        return ResponseEntity.status(500).body(error);
    }
}

@Controller
public class ErrorController implements ErrorController {
    @RequestMapping("/error")
    public String handleError(HttpServletRequest request) {
        Integer status = (Integer) request.getAttribute("javax.servlet.error.status_code");
        return status == 404 ? "error-404" : "error-general";
    }
}