SpringBoot 请求参数忽略大小写

import java.io.IOException;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Map;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;

import org.springframework.core.annotation.Order;
import org.springframework.util.LinkedCaseInsensitiveMap;
import org.springframework.web.filter.OncePerRequestFilter;

@Order(1)
//重点
@WebFilter(filterName = "caseInsensitiveFilter", urlPatterns = "/*")
public class CaseInsensitiveRequestParameterNameFilter extends OncePerRequestFilter {

	public CaseInsensitiveRequestParameterNameFilter() {
		System.out.println("CaseInsensitiveRequestParameterNameFilter.CaseInsensitiveRequestParameterNameFilter()");
	}
	
    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
            throws ServletException, IOException {
        filterChain.doFilter(new CaseInsensitiveParameterNameHttpServletRequest(request), response);
    }

    public static class CaseInsensitiveParameterNameHttpServletRequest extends HttpServletRequestWrapper {
        private final LinkedCaseInsensitiveMap<String[]> map = new LinkedCaseInsensitiveMap<>();

        public CaseInsensitiveParameterNameHttpServletRequest(HttpServletRequest request) {
            super(request);
            map.putAll(request.getParameterMap());
        }

        @Override
        public String getParameter(String name) {

            String[] array = this.map.get(name);
            if (array != null && array.length > 0)
                return array[0];
            return null;
        }

        @Override
        public Map<String, String[]> getParameterMap() {
            return Collections.unmodifiableMap(this.map);
        }

        @Override
        public Enumeration<String> getParameterNames() {
            return Collections.enumeration(this.map.keySet());
        }

        @Override
        public String[] getParameterValues(String name) {
            return this.map.get(name);
        }

    }

}

并在启动类上加入@ServletComponentScan注解

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