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在使用springboot设计controller时我们通常会在某个请求如post中使用@RequestBody来修饰参数如：

在一些特殊场景下，我们需要在service层的代码去拿到当前上下文请求（HttpServletRequest）中的一些信息如请求体，这个时候被@RequestBody所修饰的请求是无法获取的，原因如下：
1、请求体流只能读取一次：Servlet 规范中，HttpServletRequest 的输入流 (getInputStream()) 是单向的，一旦被 @RequestBody 读取后，流就会关闭，无法再次读取。
2、@RequestBody 优先处理：Spring MVC 在处理控制器方法时，会先解析 @RequestBody，导致后续通过 HttpServletRequest 获取请求体时为空。

下面简单演示下解决方案：

一、先编写一个http工具类用来读取ServletRequest的内容

import com.alibaba.fastjson.JSON;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;import javax.servlet.ServletInputStream;
import javax.servlet.ServletRequest;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.util.List;/*** http工具类*/
@Slf4j
public class HttpUtils {/*** 从request获取body的数据** @param request 请求* @return body数据字符串*/public static String getBodyStr(ServletRequest request) {StringBuilder sb = new StringBuilder();try {try (ServletInputStream inputStream = request.getInputStream()) {try (BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, StandardCharsets.UTF_8))) {String line;while ((line = reader.readLine()) != null) {sb.append(line);}}}} catch (Exception e) {log.error("get request body error: ", e);}return sb.toString();}/*** 从request获取body的数据，并转换成对象（适用于使用@RequestBody修饰的参数）** @param request request 请求* @param clazz   对象类型* @return 对象*/public static <T> T getBodyToObject(ServletRequest request, Class<T> clazz) {String bodyStr = getBodyStr(request);if (StringUtils.isBlank(bodyStr)) {return null;}return JSON.parseObject(bodyStr, clazz);}/*** 从request获取body的数据，并转换成集合对象（适用于使用@RequestBody修饰的参数）** @param request request 请求* @param clazz   集合对象类型* @return 集合对象*/public static <T> List<T> getBodyToList(ServletRequest request, Class<T> clazz) {String bodyStr = getBodyStr(request);if (StringUtils.isBlank(bodyStr)) {return null;}return JSON.parseArray(bodyStr, clazz);}
}

二、添加请求体复制包装器

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.InputStreamReader;
import java.nio.charset.StandardCharsets;/*** 请求体复制包装器*/
public class BodyCopyWrapper extends HttpServletRequestWrapper {private byte[] requestBody;public BodyCopyWrapper(HttpServletRequest request) throws IOException {super(request);requestBody = HttpUtils.getBodyStr(request).getBytes(StandardCharsets.UTF_8);}@Overridepublic BufferedReader getReader() throws IOException {return new BufferedReader(new InputStreamReader(getInputStream()));}@Overridepublic ServletInputStream getInputStream() throws IOException {final ByteArrayInputStream basis = new ByteArrayInputStream(requestBody);return new ServletInputStream() {@Overridepublic int read() throws IOException {return basis.read();}@Overridepublic boolean isFinished() {return false;}@Overridepublic boolean isReady() {return false;}@Overridepublic void setReadListener(ReadListener readListener) {}};}public void setInputStream(byte[] body) {this.requestBody = body;}
}

三、添加请求拦截器配置类

import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.Ordered;import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;/*** 请求拦截器配置类*/
@Slf4j
@Configuration
public class FilterConfig {@Beanpublic FilterRegistrationBean<RequestWrapperFilter> requestWrapperFilter() {FilterRegistrationBean<RequestWrapperFilter> bean = new FilterRegistrationBean<>();bean.setFilter(new RequestWrapperFilter());bean.addUrlPatterns("/*");bean.setOrder(Ordered.HIGHEST_PRECEDENCE);return bean;}public static class RequestWrapperFilter implements Filter {@Overridepublic void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws ServletException, IOException {ServletRequest requestWrapper = null;if (request instanceof HttpServletRequest) {requestWrapper = new BodyCopyWrapper((HttpServletRequest) request);}if (null == requestWrapper) {log.warn("未进行request包装返回原来的request");chain.doFilter(request, response);} else {chain.doFilter(requestWrapper, response);}}}
}

四、业务代码中使用方式

HttpServletRequest request = ((ServletRequestAttributes) (RequestContextHolder.currentRequestAttributes())).getRequest();
//转对象
UserLoginDTO userLoginDTO = HttpUtils.getBodyToObject(request, UserLoginDTO.class);
//直接获取内容字符串
String bodyStr = HttpUtils.getBodyStr(request);