<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.7</version>
</dependency>

import org.apache.commons.io.IOUtils;
import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
 
/**
 * @描述 包裝HttpServletRequest
 *          MyServletRequestWrapper + RequestReplaceFilter 的作用是：
 *              解決異常處理器中拿post請求的json參數(shù)時，報request流只能讀一次的錯
 *              原因是 request.getReader() 和 request.getInputStream() 都是只能調(diào)用一次
 *              所以我這里要使用 HttpServletRequestWrapper 來實現(xiàn)自定義的 MyServletRequestWrapper包裝類
 *              把request里的 body 保存在 MyServletRequestWrapper中, 并且重寫 getInputStream()方法
 *              然后所有的request都在RequestReplaceFilter中被轉(zhuǎn)換成了我自定義的HttpServletRequestWrapper
 *              然后獲取 body時就都是調(diào)用 MyServletRequestWrapper中的 getBody()方法了
 * @創(chuàng)建人 caoju
 */
public class MyServletRequestWrapper extends HttpServletRequestWrapper {
 
    private final byte[] body;
 
    public MyServletRequestWrapper(HttpServletRequest request) throws IOException {
        super(request);
        body = IOUtils.toByteArray(super.getInputStream());
    }
 
    @Override
    public BufferedReader getReader() throws IOException {
        return new BufferedReader(new InputStreamReader(getInputStream()));
    }
 
    @Override
    public ServletInputStream getInputStream() throws IOException {
        return new RequestBodyCachingInputStream(body);
    }
 
    private class RequestBodyCachingInputStream extends ServletInputStream {
        private byte[] body;
        private int lastIndexRetrieved = -1;
        private ReadListener listener;
 
        public RequestBodyCachingInputStream(byte[] body) {
            this.body = body;
        }
 
        @Override
        public int read() throws IOException {
            if (isFinished()) {
                return -1;
            }
            int i = body[lastIndexRetrieved + 1];
            lastIndexRetrieved++;
            if (isFinished() && listener != null) {
                try {
                    listener.onAllDataRead();
                } catch (IOException e) {
                    listener.onError(e);
                    throw e;
                }
            }
            return i;
        }
 
        @Override
        public boolean isFinished() {
            return lastIndexRetrieved == body.length - 1;
        }
 
        @Override
        public boolean isReady() {
            return isFinished();
        }
 
        @Override
        public void setReadListener(ReadListener listener) {
            if (listener == null) {
                throw new IllegalArgumentException("listener cann not be null");
            }
            if (this.listener != null) {
                throw new IllegalArgumentException("listener has been set");
            }
            this.listener = listener;
            if (!isFinished()) {
                try {
                    listener.onAllDataRead();
                } catch (IOException e) {
                    listener.onError(e);
                }
            } else {
                try {
                    listener.onAllDataRead();
                } catch (IOException e) {
                    listener.onError(e);
                }
            }
        }
 
        @Override
        public int available() throws IOException {
            return body.length - lastIndexRetrieved - 1;
        }
 
        @Override
        public void close() throws IOException {
            lastIndexRetrieved = body.length - 1;
            body = null;
        }
    }
}

import org.springframework.stereotype.Component;
import org.springframework.web.filter.OncePerRequestFilter;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
 
/**
 * @描述
 * @創(chuàng)建人 caoju
 */
@Component
public class RequestReplaceFilter extends OncePerRequestFilter {
 
    @Override
    protected void doFilterInternal(HttpServletRequest request,
                                    HttpServletResponse response,
                                    FilterChain filterChain) throws ServletException, IOException {
        if (!(request instanceof MyServletRequestWrapper)) {
            request = new MyServletRequestWrapper(request);
        }
        filterChain.doFilter(request, response);
    
        /*//如果有文件上傳的業(yè)務(wù)場景，需要用下面的代碼進行處理，不然文件上傳的流會有問題
        String contentType = request.getContentType();
        //如果contentType是空
        //或者contentType是多媒體的上傳類型則忽略，不進行包裝，直接return
        if (contentType == null) {
            filterChain.doFilter(request, response);
            return;
        }else if(request.getContentType().startsWith("multipart/")){
            filterChain.doFilter(request, response);
            return;
        }else if (!(request instanceof MyServletRequestWrapper)) {
            request = new MyServletRequestWrapper(request);
        }
        filterChain.doFilter(request, response);
        */
    }
}

        RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();
        String mode = "";
        String methodUrl = "";
        String param = "";
        if (requestAttributes != null) {
            ServletRequestAttributes attributes = (ServletRequestAttributes) requestAttributes;
            HttpServletRequest request = attributes.getRequest();
            //請求方式
            mode = request.getMethod();
            //方法URL
            methodUrl = request.getRequestURI();
            if(mode.equals(HttpMethod.GET.name())){
                param = request.getQueryString();
            }
            if(mode.equals(HttpMethod.POST.name())){
                param = getJsonRequest(request);
            }
        }

    /**
     * 獲取Request中的JSON字符串
     * @param request
     * @return
     * @throws IOException
     */
    public static String getJsonRequest(HttpServletRequest request) {
        StringBuilder sb = new StringBuilder();
        try (BufferedReader reader = request.getReader();) {
            char[] buff = new char[1024];
            int len;
            while ((len = reader.read(buff)) != -1) {
                sb.append(buff, 0, len);
            }
        } catch (IOException e) {
            log.error("POST請求參數(shù)獲取異常", e);
        }
        return sb.toString();
    }