SpringBoot中使用自定义注解和拦截器实现简单的权限控制

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
 
@RestController
public class ExampleController {
 
    @GetMapping("/example")
    @CheckPermission(module = "example", permission = "read")
    public String exampleMethod() {
        return "You have read permission on the example module.";
    }
}
 
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
 
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface CheckPermission {
    String module();
    String permission();
}
 
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
public class PermissionInterceptor implements HandlerInterceptor {
 
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
        if (handler instanceof HandlerMethod) {
            HandlerMethod handlerMethod = (HandlerMethod) handler;
            CheckPermission checkPermission = handlerMethod.getMethodAnnotation(CheckPermission.class);
            if (checkPermission != null) {
                // 实现权限检查的逻辑
                // 例如，检查当前用户是否有权限读取指定模块
                // 返回true如果权限被授予，否则返回false
                boolean hasPermission = checkUserPermission(checkPermission.module(), checkPermission.permission());
                if (!hasPermission) {
                    response.setStatus(HttpServletResponse.SC_FORBIDDEN);
                    return false;
                }
            }
        }
        return true;
    }
 
    private boolean checkUserPermission(String module, String permission) {
        // 实现权限检查的逻辑
        // 返回true如果用户有权限，否则返回false
        return false; // 示例返回值，实际应用中应该查询权限系统
    }
}
 
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
 
@Configuration
public class WebConfig implements WebMvcConfigurer {
 
    @Autowired
    private PermissionInterceptor permissionInterceptor;
 
    @Ov