@WebFilter中的filterName首字母一定要小写！！！

package com.xiaohang.socialcard.pre.filter;import com.xiaohang.socialcard.pre.utils.SM4Util;import lombok.extern.slf4j.Slf4j;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.ArrayList;import java.util.HashMap;import java.util.Map;@Slf4j@WebFilter(urlPatterns = {"/api/v1/get/getToken", "/api/v1/get/query", "/api/v1/get/page"}, filterName = "signAutheFilter")public class SignAutheFilter implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { } @Override public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException { HttpServletRequest request = (HttpServletRequest) req; String param = request.getParameter("param"); try { param = SM4Util.encryptEcb("1234567890", param); } catch (Exception e) { e.printStackTrace(); } MyRequestWrapper parameterRequestWrapper = new MyRequestWrapper(request); parameterRequestWrapper.addParameter("param", param); chain.doFilter(parameterRequestWrapper, res);// 替换原始请求参数 } @Override public void destroy() { }}class MyRequestWrapper extends HttpServletRequestWrapper { private Map<String, String[]> params = new HashMap<String, String[]>(); @SuppressWarnings("unchecked") public MyRequestWrapper(HttpServletRequest request) { // 将request交给父类，以便于调用对应方法的时候，将其输出，其实父亲类的实现方式和第一种new的方式类似 super(request); //将参数表，赋予给当前的Map以便于持有request中的参数 this.params.putAll(request.getParameterMap()); } //重载一个构造方法 public MyRequestWrapper(HttpServletRequest request, Map<String, Object> extendParams) { this(request); addAllParameters(extendParams);//这里将扩展参数写入参数表 } @Override public String getParameter(String name) {//重写getParameter，代表参数从当前类中的map获取 String[] values = params.get(name); if (values == null || values.length == 0) { return null; } return values[0]; } public String[] getParameterValues(String name) {//同上 return params.get(name); } public void addAllParameters(Map<String, Object> otherParams) {//增加多个参数 for (Map.Entry<String, Object> entry : otherParams.entrySet()) { addParameter(entry.getKey(), entry.getValue()); } } public void addParameter(String name, Object value) {//增加参数 if (value != null) { if (value instanceof ArrayList) { String value1 = String.valueOf(value).substring(1, String.valueOf(value).length()); value = value1.substring(0, value1.length() - 1); params.put(name, new String[]{(String) value}); } else if (value instanceof String[]) { params.put(name, (String[]) value); } else if (value instanceof String) { params.put(name, new String[]{(String) value}); } else { params.put(name, new String[]{String.valueOf(value)}); } } }}二、Application.class这里一定要加上ServletComponentScan注解用于扫描Filter过滤器

package com.xiaohang.socialcard.pre;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.boot.web.servlet.ServletComponentScan;import org.springframework.cloud.netflix.feign.EnableFeignClients;@EnableFeignClients@SpringBootApplication@ServletComponentScanpublic class Application { public static void main(String[] args) { SpringApplication.run(Application.class, args); }}