【Java】文件參數攔截器實例

參數攔截器

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ValidInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("=======參數驗證攔截器已生效==========");
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        if (null == username || "" == username) {
            System.out.println("用戶名爲空");
            return false;
        }
        if (null == password || "" == password) {
            System.out.println("密碼不能爲空");
            return false;
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }

}

文件攔截器

import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Iterator;

public class FileInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("======文件攔截器已生效========");
        MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
        Iterator<String> iterator = multipartRequest.getFileNames();
        while (iterator.hasNext()) {
            MultipartFile file = multipartRequest.getFile(iterator.next());
            String fileName = file.getOriginalFilename();
            if (fileName.matches(".+(jsp|html|js)$")) {
                System.out.println("文件名包含敏感信息: " + fileName);
                return false;
            }
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }

}