//啟動類添加註解
@ServletComponentScan

package com.baiwang.invoice.utils;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import
 
 javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;

/**
 * Created by ChengLuchao on 2017/8/1.
 */
// 過濾器添加註解

@WebFilter(filterName="myFilter",urlPatterns="/*")
public class KeyWordFilter implements
 
 Filter {
//    private FilterConfig filterConfig;
    public static HashMap keyMap = null;
    public static String path;

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("-----------------------------------------啟動");
//        this.filterConfig = filterConfig;
 
//        String keyWordPath = filterConfig.getInitParameter("key");
        path = filterConfig.getServletContext().getRealPath("keyword.properties");
        System.out.println(path);
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        System.out.println("----------------------------------------執行");
        HttpServletRequest req = (HttpServletRequest) request;
//        if (keyMap == null) {
//            keyMap = (HashMap) PropertiesUtil.readProperties(path);
//        }
        keyMap = new HashMap();
        keyMap.put("ccc","clclclclclcl");
        if (req.getMethod().equals("POST")) {
            chain.doFilter(new KeyWordRequestWrapper(req, keyMap), response);
            Map map =  request.getParameterMap();
            for (Object key: map.keySet()) {
                if (keyMap.get(key) != null) {
                    map.put(keyMap.get(key),map.get(key));
                    map.remove(key);
                }
            }
            request.setAttribute("map",map);
        } else {
            chain.doFilter(request, response);
        }
    }

    @Override
    public void destroy() {
       // this.filterConfig = null;
        System.out.println("----------------------------------------銷毀");
    }
}

spring boot 使用過濾器