配置拦截器，获取请求内容

 

 处理入参

package com.htsc.thfx.interceptor.interceptor;

import org.springframework.util.StreamUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;

public class BootInterceptor implements HandlerInterceptor {
    /**
     * 在请求处理之前进行调用（Controller方法调用之前）
     */
    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
        System.out.println("执行了BootInterceptor的preHandle方法");

        // 根据请求类型获取 入参
        String method = httpServletRequest.getMethod();
        if ("GET".equalsIgnoreCase(method)) {
            Map<String, String[]> parameterMap = httpServletRequest.getParameterMap();
        } else {
            //获取请求body
            byte[] bodyBytes = StreamUtils.copyToByteArray(httpServletRequest.getInputStream());
            String body = new String(bodyBytes, httpServletRequest.getCharacterEncoding());
        }

        //如果设置为true时，请求将会继续执行后面的操作
        //如果设置为false时，被请求时，请求终止，且后面的 postHandle 和 afterCompletion 方法都不会执行
        return true;
    }

    /**
     * 请求处理之后进行调用，但是在视图被渲染之前（Controller方法调用之后）
     */
    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
        System.out.println("执行了BootInterceptor的postHandle方法");


    }

    /**
     * 在整个请求结束之后被调用，也就是在DispatcherServlet 渲染了对应的视图之后执行（主要是用于进行资源清理工作）
     */
    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
        System.out.println("执行了BootInterceptor的afterCompletion方法");


    }
}

 

　

package com.htsc.thfx.interceptor.config;

import com.htsc.thfx.interceptor.interceptor.BootInterceptor;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.web.DispatcherServletAutoConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.format.FormatterRegistry;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.validation.MessageCodesResolver;
import org.springframework.validation.Validator;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.HandlerMethodReturnValueHandler;
import org.springframework.web.servlet.DispatcherServlet;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.config.annotation.*;

import java.util.List;

@Configuration
public class BootConfig implements WebMvcConfigurer {
    @Override
    public void configurePathMatch(PathMatchConfigurer pathMatchConfigurer) {

    }

    @Override
    public void configureContentNegotiation(ContentNegotiationConfigurer contentNegotiationConfigurer) {

    }

    @Override
    public void configureAsyncSupport(AsyncSupportConfigurer asyncSupportConfigurer) {

    }

    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer defaultServletHandlerConfigurer) {

    }

    @Override
    public void addFormatters(FormatterRegistry formatterRegistry) {

    }

    @Override
    public void addInterceptors(InterceptorRegistry interceptorRegistry) {
        InterceptorRegistration registration = interceptorRegistry.addInterceptor(new BootInterceptor());
        // 过滤所有接口
        registration.addPathPatterns("/**");
        // 排除不过滤的接口
        registration.excludePathPatterns(
                "/simulationPort/**"
        );
    }

    @Bean
    @Qualifier(DispatcherServletAutoConfiguration.DEFAULT_DISPATCHER_SERVLET_BEAN_NAME)
    public DispatcherServlet dispatcherServlet() {
        return new XinDispatcherServlet();
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry resourceHandlerRegistry) {

    }

    @Override
    public void addCorsMappings(CorsRegistry corsRegistry) {

    }

    @Override
    public void addViewControllers(ViewControllerRegistry viewControllerRegistry) {

    }

    @Override
    public void configureViewResolvers(ViewResolverRegistry viewResolverRegistry) {

    }

    @Override
    public void addArgumentResolvers(List<HandlerMethodArgumentResolver> list) {

    }

    @Override
    public void addReturnValueHandlers(List<HandlerMethodReturnValueHandler> list) {

    }

    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> list) {

    }

    @Override
    public void extendMessageConverters(List<HttpMessageConverter<?>> list) {

    }

    @Override
    public void configureHandlerExceptionResolvers(List<HandlerExceptionResolver> list) {

    }

    @Override
    public void extendHandlerExceptionResolvers(List<HandlerExceptionResolver> list) {

    }

    @Override
    public Validator getValidator() {
        return null;
    }

    @Override
    public MessageCodesResolver getMessageCodesResolver() {
        return null;
    }
}

package com.htsc.thfx.interceptor.config;

import org.springframework.web.servlet.DispatcherServlet;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 自定义 DispatcherServlet 来分派 XinHttpServletRequestWrapper
 */
public class XinDispatcherServlet extends DispatcherServlet {

    /**
     * 包装成自定义的request
     *
     * @param request
     * @param response
     * @throws Exception
     */
    @Override
    protected void doDispatch(HttpServletRequest request, HttpServletResponse response) throws Exception {
        super.doDispatch(new XinHttpServletRequestWrapper(request), response);
    }
}

package com.htsc.thfx.interceptor.config;

import org.springframework.util.StreamUtils;

import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.*;

/**
 * 自定义 HttpServletRequestWrapper 来包装输入流
 * 背景：因为ServletInputStream被读取后无法第二次再读取了，所以要把读取过的内容存下来，然后需要的时候对外提供可被重复读取的ByteArrayInputStream
 * 为了重写 ServletInputStream 的 getInputStream()方法，要自定义一个 HttpServletRequestWrapper
 */
public class XinHttpServletRequestWrapper extends HttpServletRequestWrapper {

    /**
     * 缓存下来的HTTP body
     */
    private byte[] body;

    public XinHttpServletRequestWrapper(HttpServletRequest request) throws IOException {
        super(request);
        body = StreamUtils.copyToByteArray(request.getInputStream());
    }

    /**
     * 重新包装 getInputStream
     *
     * @return
     * @throws IOException
     */
    @Override
    public ServletInputStream getInputStream() throws IOException {
        InputStream bodyStream = new ByteArrayInputStream(body);
        return new ServletInputStream() {

            @Override
            public int read() throws IOException {
                return bodyStream.read();
            }

            /**
             * 下面的方法一般情况下不会被使用，如果引入了一些需要使用ServletInputStream的外部组件，后面可以关注一下。
             * @return
             */
            @Override
            public boolean isFinished() {
                return false;
            }

            @Override
            public boolean isReady() {
                return true;
            }

            @Override
            public void setReadListener(ReadListener readListener) {

            }
        };
    }

    /**
     * 重新包装 getReader
     *
     * @return
     * @throws IOException
     */
    @Override
    public BufferedReader getReader() throws IOException {
        InputStream bodyStream = new ByteArrayInputStream(body);
        return new BufferedReader(new InputStreamReader(getInputStream()));
    }
}