package com.config;
import org.springframework.http.HttpRequest;
import org.springframework.http.client.ClientHttpRequestExecution;
import org.springframework.http.client.ClientHttpRequestInterceptor;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.http.client.support.HttpRequestWrapper;
import org.springframework.stereotype.Component;
import org.springframework.web.util.UriComponentsBuilder;
import java.io.IOException;
import java.net.URI;
@Component
public class Interceptor implements ClientHttpRequestInterceptor {
    /**
     * Intercept the given request, and return a response. The given {@link ClientHttpRequestExecution} allows
     * the interceptor to pass on the request and response to the next entity in the chain.
     *
     * <p>A typical implementation of this method would follow the following pattern:
     * <ol>
     * <li>Examine the {@linkplain HttpRequest request} and body</li>
     * <li>Optionally {@linkplain HttpRequestWrapper wrap} the request to filter HTTP attributes.</li>
     * <li>Optionally modify the body of the request.</li>
     * <li><strong>Either</strong>
     * <ul>
     * <li>execute the request using {@link ClientHttpRequestExecution#execute(HttpRequest, byte[])},</li>
     * <strong>or</strong>
     * <li>do not execute the request to block the execution altogether.</li>
     * </ul>
     * <li>Optionally wrap the response to filter HTTP attributes.</li>
     * </ol>
     *
     * @param request   the request, containing method, URI, and headers
     * @param body      the body of the request
     * @param execution the request execution
     * @return the response
     * @throws IOException in case of I/O errors
     */
    @Override
    public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution) throws IOException {
        String str = request.getURI().toString();
        String str1 = str.replace("https://baidu.com", "http://39.156.66.10:8080");
        URI newUri = UriComponentsBuilder.fromUri(URI.create(str)).build().toUri();
         return execution.execute(new UriModifyHttpRequestWrapper(request, newUri), body);
    }
    private static class UriModifyHttpRequestWrapper extends HttpRequestWrapper {
        private final URI uri;
        public UriModifyHttpRequestWrapper(HttpRequest request, URI uri) {
            super(request);
            this.uri = uri;
        }
        @Override
        public URI getURI() {
            return uri;
        }
    }
}

@Override
public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain)
{
    ServerHttpRequest str = exchange.getRequest();
    //新url
    String newPath ="/system/loanOrg/list";
    ServerHttpRequest newRequest = str.mutate().path(newPath).build();
    exchange.getAttributes().put("path", newRequest.getURI());
    return chain.filter(exchange.mutate() .request(newRequest).build());
}

import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;
@Component
public class GlobalInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        HttpServletResponseWrapper httpResponse = new HttpServletResponseWrapper((HttpServletResponse) response);
        System.out.println(request.getRequestURI());
        String path=request.getRequestURI();
        if(path.indexOf("/idea")>-1){
            path = path.replaceAll("/idea","");
            request.getRequestDispatcher(path).forward(request,response);
        }
 
        return true;
    }
}

import com.GlobalInterceptor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
@Configuration
public class WebMvcConfig implements WebMvcConfigurer {
    @Autowired
    GlobalInterceptor globalInterceptor;
 
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(globalInterceptor).addPathPatterns("/idea/**");
    }
} 

package com.framework.filter;

import java.io.IOException;
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.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;

/**
 * 修改請求路由，當進入url為/a/b時，將其url修改為/api/a/b
 *  
 **/
public class UrlFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }

    @Override
    public void destroy() {
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest httpRequest = (HttpServletRequest)request;
        HttpServletResponseWrapper httpResponse = new HttpServletResponseWrapper((HttpServletResponse) response);
        System.out.println(httpRequest.getRequestURI());
        String path=httpRequest.getRequestURI();
        if(path.indexOf("/api/")<0){
            path="/api"+path;
            System.out.println(path);
            httpRequest.getRequestDispatcher(path).forward(request,response);
        }
       else {
            chain.doFilter(request,response);

        }
        return;
    }
}

package com.shitou.huishi.framework.filter;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
/**
 * Created by qhong on 2018/5/16 15:28
 **/
@Configuration
public class FilterConfig {
    @Bean
    public FilterRegistrationBean registFilter() {
        FilterRegistrationBean registration = new FilterRegistrationBean();
        registration.setFilter(new UrlFilter());
        registration.addUrlPatterns("/*");
        registration.setName("UrlFilter");
        registration.setOrder(1);
        return registration;
    }
}

	@Configuration
	public class CustMvcConfigurerAdapter extends WebMvcConfigurerAdapter {
    @Autowired
    private CustInterceptor custInterceptor;
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(custInterceptor).addPathPatterns("/**");
    }
}

排除指定路徑

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(custInterceptor).addPathPatterns("/**").excludePathPatterns("/select/**");
    }

@Override
public void addInterceptors(InterceptorRegistry registry) {
    registry.addInterceptor(custInterceptor).addPathPatterns("/user/**");
}

@Component
public class CustInterceptor extends HandlerInterceptorAdapter {
	   @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        boolean needLogin = needLogin(request);
        if (!needLogin) {
            return true;
        }
        boolean isLogin = checkLogin(request, response);
        return isLogin;
    }
}