全局修改后端参数

问题描述：

前端发起的get请求，传参时参数带有+，后端接收时自动转译变成了空格，由于接口太多，不方便一个一个处理，所以怎么一次性修改所有的接口的传参呢？

解决方案：

一、启动类添加

@ServletComponentScan(basePackages = "kr.wms")

 二、在任意一个路径下，使用过滤器，重写doFilter接口，实现参数的全局更改

package kr.wms.domain.common.utils;

import org.apache.commons.lang3.StringUtils;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.IOException;
import java.util.*;

@WebFilter
public class AuthHeaderSettingFilter implements Filter{
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletRequestWrapper requestWrapper = new HttpServletRequestWrapper((HttpServletRequest) request) {
            /**
             * 当调用request.getHeader("token")时，则获取请求参数中token值并当做Header的值返回
             * @param name
             * @return
             */
            @Override
            public String getHeader(String name) {
                // 先从原本的Request中获取头，如果为空且名字为token，则从参数中查找并返回
                String superHeader = super.getHeader(name);
                if("token".equals(name) && StringUtils.isEmpty(superHeader)){
                    String token = request.getParameter("token");
                    if (StringUtils.isNotEmpty(token)) {
                        return token ;
                    }
                }
                return superHeader;
            }
            @Override
            public String getParameter(String name) {
                if("materialCode".equals(name)){
                    return super.getParameter(name)==null||"".equals(super.getParameter(name))?null:super.getParameter(name).replace("%2B", "").replace(" ", "");
                }
                return super.getParameter(name);
            }
            @Override
            public Map<String, String[]> getParameterMap() {
                HashMap<String, String[]> newMap = new HashMap<>();
                newMap.putAll(super.getParameterMap());
                Map<String, String[]> parameterMap = super.getParameterMap();
                if (parameterMap!=null&&!parameterMap.isEmpty()){
                    if (parameterMap.get("materialCode")!=null&&(Arrays.toString(parameterMap.get("materialCode")).contains("%2B")|| Arrays.toString(parameterMap.get("materialCode")).contains(" "))){
                        String replace = Arrays.toString(parameterMap.get("materialCode")).replace("%2B", "").replace(" ", "").replace("[","").replace("]","");
                        newMap.put("materialCode",new String[]{replace}) ;
                    }
                }
                //在这里处理就行
//                newMap.put("newParam",new String[]{"这是我新增加的参数"}) ;
                return Collections.unmodifiableMap(newMap);
            }
            @Override
            public String[] getParameterValues(String name) {
                if("materialCode".equals(name)){
                    return new String[]{Arrays.toString(super.getParameterValues(name)).replace("%2B", "").replace(" ", "").replace("[","").replace("]","")};
                }
                return super.getParameterValues(name);
            }

        };
        chain.doFilter(requestWrapper,response);
    }
    @Override
    public void destroy() {
    }

}