解读HttpServletRequestWrapper处理request数据流多次读取问题

@RequestMapping("/testWwwFrom")
@ResponseBody
public Book testWwwFrom(Book req, HttpServletRequest servletRequest) {
    logger.info("查询所有1用户信息" + JSON.toJSONString(req));
    return req;
}

@RequestMapping("/testFormData")
@ResponseBody
public Book testFormData(Book req, HttpServletRequest servletRequest) {
    logger.info("查询所有1用户信息" + JSON.toJSONString(req));
    return req;
}

@RequestMapping("/testJson")
@ResponseBody
public Book testJsonFrom(@RequestBody Book req, HttpServletRequest servletRequest) {
    logger.info("查询所有1用户信息" + JSON.toJSONString(req));
​
    return req;
}

package com.study.ju.web.interceptor;
​
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.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
​
/**
 * <p>https://blog.csdn.net/kaizhangzhang/article/details/97900961</p>
 *
 * 
 * @version v 0.1 2023/5/29 15:37
 */
public class ResettableServletRequestWrapper extends HttpServletRequestWrapper {
    //保存流中的数据
    private byte[] data;
​
    /**
     * Constructs a request object wrapping the given request.
     *
     * @param request
     * @throws IllegalArgumentException if the request is null
     */
    public ResettableServletRequestWrapper(HttpServletRequest request) throws IOException {
        super(request);
        //从流中获取数据
        data = IOUtils.toByteArray(request.getInputStream());
    }
​
    @Override
    public ServletInputStream getInputStream() throws IOException {
        //在调用getInputStream函数时，创建新的流，包含原先数据流中的信息，然后返回
        return new NewServletInputStream(new ByteArrayInputStream(data));
    }
​
    class NewServletInputStream extends ServletInputStream{
        private InputStream inputStream;
​
        public NewServletInputStream(InputStream inputStream){
            this.inputStream = inputStream;
        }
​
        @Override
        public int read() throws IOException {
            return inputStream.read();
        }
​
        @Override
        public boolean isFinished() {
            return false;
        }
​
        @Override
        public boolean isReady() {
            return false;
        }
​
        @Override
        public void setReadListener(ReadListener readListener) {
​
        }
    }
    @Override
    public BufferedReader getReader() throws IOException {
        return new BufferedReader(new InputStreamReader(this.getInputStream()));
    }
​
​
}

package com.study.ju.web.interceptor;
​
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Value;
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.List;
import java.util.Map;
​
/**
 * <p>form表单提交校验token</p>
 *
 * 
 * @version v 0.1 2023/5/29 13:45
 */
public class FormSubmitTokenInterceptor implements HandlerInterceptor {
​
​
    private String formSubmitTokenInterceptorUrls = "[\"/testJson\",\"/test/testJson\",\"/test/testWwwFrom\",\"/test/testRequestParam\"]";
​
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String requestURI = getRequestURI(request);
        if ("POST".equals(request.getMethod().toUpperCase()) && StringUtils.isNotEmpty(formSubmitTokenInterceptorUrls)) {
            List<String> formInterceptorUrls = JSONArray.parseArray(formSubmitTokenInterceptorUrls, String.class);
            if (CollectionUtils.isNotEmpty(formInterceptorUrls)) {
                boolean contains = formInterceptorUrls.stream().anyMatch(e -> e.contains(requestURI));
                if (contains) {
                    String contentType = request.getContentType();
                    System.out.println(contentType);
                    if ("application/json".equalsIgnoreCase(contentType)) {
                        ResettableServletRequestWrapper resettableServletRequestWrapper = new ResettableServletRequestWrapper(request);
                        String bodyParam = IOUtils.toString(resettableServletRequestWrapper.getInputStream());
                        System.out.println(bodyParam);
                        if (StringUtils.isNotEmpty(bodyParam)) {
                            JSONObject jsonObject = JSONObject.parseObject(bodyParam);
                            if (jsonObject.containsKey("formToken")) {
                                String formToken = (String) jsonObject.get("formToken");
                                System.out.println("formToken:"+formToken);
                            }
                        }
​
                    } else {
                        if (StringUtils.isNotEmpty(request.getParameter("formToken"))) {
                            System.out.println("formToken2:"+request.getParameter("formToken"));
                        }
                        System.out.println("name:"+request.getParameter("name"));
                    }
​
​
                }
​
            }
        }
        return true;
    }
​
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
​
    }
​
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
​
    }
​
    /**
     * 获取用户请求的path，不带contextPath
     * 如：/index.htm
     */
    public static String getRequestURI(HttpServletRequest request) {
        return StringUtils.replace(request.getRequestURI(), request.getContextPath(), "");
    }
}

<filter>
   <filter-name>requestFilter</filter-name>
   <filter-class>com.study.ju.web.Filter.HttpServletRequestReplacedFilter</filter-class>
</filter>
<filter-mapping>
   <filter-name>requestFilter</filter-name>
   <url-pattern>/*</url-pattern>
</filter-mapping>