使用SpringMVC 重写、扩展HttpServletRequest请求参数

@InitBinder
protected void initBinder(WebDataBinder binder) {
 SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
 dateFormat.setLenient(true);
    //根据时间类型进行转换
 binder.registerCustomEditor(Date.class, new CustomDateEditor(dateFormat, true));
    //指定参数字段名称进行转换
 binder.registerCustomEditor(Date.class, "registerDate",new CustomDateEditor(dateFormat, true));
}

public class MyHttpServletRequest implements HttpServletRequest {
    @Override
    public String getAuthType()
 @Override
     public Cookie[] getCookies() 
 @Override
    public long getDateHeader(String s) 
    //.......
}

package com.timer.web.interceptor; 
import com.alibaba.fastjson.JSONObject;
import com.timer.common.utils.JsonUtil;
import org.springframework.web.filter.OncePerRequestFilter;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Map;
import java.util.Vector;
import java.util.concurrent.ConcurrentHashMap;
 
public class MyParametersFilter extends OncePerRequestFilter {
    @Override
    protected void doFilterInternal(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, FilterChain filterChain) throws ServletException, IOException {
        MyParametersWrapper myParametersWrapper = new MyParametersWrapper(httpServletRequest);
        filterChain.doFilter(myParametersWrapper, httpServletResponse);
    }
 
    /**
     * 继承HttpServletRequestWrapper，创建装饰类，以达到修改HttpServletRequest参数的目的
     */
    private class MyParametersWrapper extends HttpServletRequestWrapper {
 
        private static final String  OTHER_PARAM = "other";
  
        private Map<String, String[]> parameterMap; // 所有参数的Map集合
 
        /**
         * other 参数所包含的参数信息
         */
        private Map<String, String[]> otherMap;
 
 
        public MyParametersWrapper(HttpServletRequest request) {
            super(request);
            parameterMap = request.getParameterMap();
            otherMap = new ConcurrentHashMap<>();
            /**
             * 判断other参数是否为空
             */
            if(null != parameterMap.get(BODY_PARAM)){
                otherConversion(parameterMap.get(BODY_PARAM));
            }
        }
 
        /**
         * 将other参数转为map参数
         * @param others
         */
        private void otherConversion(String[] others){
            if(null != others && others.length > 0){
                JSONObject obj = null;
                for(String other : others){
                    try {
                        obj = JsonUtil.parseObject(other);
                        if(null != obj){
                            for(Map.Entry<String, Object> entry : obj.entrySet()){
                                otherMap.put(entry.getKey(),new String []{String.valueOf(entry.getValue())});
                            }
                        }
                    }catch (Throwable e){
                        logger.error("otherConversion.is.system.error",e);
                    }
                }
            }
        }
 
        // 重写几个HttpServletRequestWrapper中的方法
        /**
         * 获取所有参数名
         *
         * @return 返回所有参数名
         */
        @Override
        public Enumeration<String> getParameterNames() {
            Vector<String> vector = new Vector<String>(parameterMap.keySet());
            vector.addAll(otherMap.keySet());
            return vector.elements();
        }
 
        /**
         * 获取指定参数名的值，如果有多个参数时默认取第一个
         *
         * @param name 指定参数名
         * @return 指定参数名的值
         */
        @Override
        public String getParameter(String name) {
            String[] values = parameterMap.get(name);
            try {
                if (values == null) {
                    if (null != otherMap) {
                        values = otherMap.get(name);
                    }
                }
            }catch (Throwable e){
                logger.error("getParameter.is.system.error",e);
            }
            if(null == values){
                return null;
            }
            return values.length > 0 ? values[0] :super.getParameter(name);
        }
 
        /**
         * 获取指定参数名的所有值的数组
         */
        @Override
        public String[] getParameterValues(String name) {
            String[] values = parameterMap.get(name);
            try{
                if (values == null) {
                    if(null != otherMap){
                        values = otherMap.get(name);
                    }
                }
            }catch (Throwable e){
                logger.error("getParameterValues.is.system.error",e);
            }
            return values != null ? values : super.getParameterValues(name);
        }
    }
}

@RequestMapping(value = "/index")
@ResponseBody
public String index(MyVo param) {
 //......
}

import com.alibaba.fastjson.JSON;
public class JsonUtil {
 public static JSONObject parseObject(String jsonText) {
  try {
   return JSON.parseObject(jsonText);
  } catch (Exception e) {
   logger.error("解析字符串:{} json出错:{}", jsonText, e);
  }
  return null;
 }
}

<filter>
   <filter-name>myParametersFilter</filter-name>
   <filter-class>com.timer.web.interceptor.MyParametersFilter</filter-class>
</filter>
<filter-mapping>
   <filter-name>myParametersFilter</filter-name>
   <url-pattern>/*</url-pattern>
</filter-mapping>