springboot接口如何多次获取request中的body内容

1. 概述 在使用springboot开发接口时,会将参数转化为Bean,用来进行参数的自动校验。同时也想获取request中原始body报文进行验签(防止报文传输过程中被篡改)。
因为通过将bean再转化为字符串后,body里面的报文格式、字段顺序会发生改变,就会导致验签失败。因此只能通过request来获取body里面的内容。
既想接口自动实现参数校验,同时又想获取request中的原始报文,因此我们可以通过在controller中的restful方法中,写入两个参数,获取多次request中的body内容。
那么如何实现多次读取body内容了(因为request里的body是以字节流的方式读取的,默认情况下读取一次,字节流就没有了),下面就来大致分析一下。
2 接口接收参数的其他方式 2.1 接收参数方法一
方法一、

public R list(@RequestBody String rawMsg)

采用上述方式可以直接获得请求报文中的原始body信息,而且当body是一个json字符串时,rawMsg参数接口到的body值,不会改变json中key的顺序,即与发送方的body内容是保持一致的。这种方式可以用来对报文验签,因为被加密的字符串与发送方是保持一致的。
这种方式可以接受request里面body内容的原始格式,保持与发送方一致。
如下就可以对原始报文进行验签操作了
// 用公钥,对原始报文进行验签,在这里如果rawMsg里面是json时,当key的顺序改变后,会验签失败,//如此我们可以通过request来获取body里面的原始报文boolean verifyResult = SignVerifyUtils.verifySignature(rawMsg, Constant.NPIS_PUBLIC_KEY);

2.2 接收参数方法二
方法二、
public R list(@RequestBody @Validated ReqBean abcReqBean)

这种接受参数的方法,可以将request里的json报文,直接转换成对应的bean对象。并且可以用来校验参数,例如某个字段是必传的、某个字段的值最大是多少等等。例如
@NotNull(message = "日期字段不允许为空")@Size(min = 8, max = 8, message = "日期字符串的长度必须为 8")private String beginDate;

有没有一种方法,既能同时利用参数校验功能,又能获取原始body里的内容来进行验签呢,这时候就可以采用下面的第3中方法。
2.3 接收参数方法三
@RequestMapping(method = {RequestMethod.POST}, value = "https://www.it610.com/dataQry") public R list(@RequestBody @Validated ReqBean abcReqBean,HttpServletRequest request){}

在这里就可以通过将报文转换成abcReqBean对象,并实现接口参数的自动校验功能;同时可以利用request获取原始报文来进行验签。
【springboot接口如何多次获取request中的body内容】注意:由于在接收参数时,HttpServletRequest只能读取一次body内容(因为是读的字节流,读完就没了),因此我们需要需要做特殊处理,
下面来看一种基于SpringBoot来解决HttpServletRequest只能读取一次的问题。
2.3.1 继承HttpServletRequestWrapper包装类,每次读取body后,再将参数写会request
为解决上述多次读取request中的body内容的问题,我们只需要将以下两个类,放到项目中即可,并通过@Component来注测为spring bean即可
继承HttpServletRequestWrapper ,实现每次读取request中的body后,在将内容写回request。
package com.abcd.config; 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.*; /** * @author: */public class RequestWrapper extends HttpServletRequestWrapper {//参数字节数组private byte[] requestBody; //Http请求对象private HttpServletRequest request; public RequestWrapper(HttpServletRequest request) throws IOException {super(request); this.request = request; } /*** @return* @throws IOException*/@Overridepublic ServletInputStream getInputStream() throws IOException {/*** 每次调用此方法时将数据流中的数据读取出来,然后再回填到InputStream之中* 解决通过@RequestBody和@RequestParam(POST方式)读取一次后控制器拿不到参数问题*/if (null == this.requestBody) {ByteArrayOutputStream baos = new ByteArrayOutputStream(); IOUtils.copy(request.getInputStream(), baos); this.requestBody = baos.toByteArray(); } final ByteArrayInputStream bais = new ByteArrayInputStream(requestBody); return new ServletInputStream() { @Overridepublic boolean isFinished() {return false; } @Overridepublic boolean isReady() {return false; } @Overridepublic void setReadListener(ReadListener listener) { } @Overridepublic int read() {return bais.read(); }}; } public byte[] getRequestBody() {return requestBody; } @Overridepublic BufferedReader getReader() throws IOException {return new BufferedReader(new InputStreamReader(this.getInputStream())); }}

2.3.2 将包装类加入过滤器链
回写参数的包装类写好之后接下来就是加入过滤器链之中,如下:
package com.abcd.config; import org.springframework.stereotype.Component; import javax.servlet.*; import javax.servlet.annotation.WebFilter; import javax.servlet.http.HttpServletRequest; import java.io.IOException; /** * @author: */@Component@WebFilter(filterName = "channelFilter", urlPatterns = {"/*"})public class ChannelFilter implements Filter {@Overridepublic void init(FilterConfig filterConfig) throws ServletException {} @Overridepublic void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) {try {ServletRequest requestWrapper = null; if (request instanceof HttpServletRequest) {requestWrapper = new RequestWrapper((HttpServletRequest) request); }if (requestWrapper == null) {chain.doFilter(request, response); } else {chain.doFilter(requestWrapper, response); }} catch (IOException e) {e.printStackTrace(); } catch (ServletException e) {e.printStackTrace(); } } @Overridepublic void destroy() {} }

解决springboot v2.2以上重复读取request body内容问题 一、需求
项目有两个场景会用到从Request的Body中读取内容。
1、打印请求日志
2、提供Api接口,在api方法执行前,从Request Body中读取参数进行验签,验签通过后在执行api方法
二、解决方案
2.1 自定义RequestWrapper
public class MyRequestWrapper extends HttpServletRequestWrapper { private final String body; public MyRequestWrapper(HttpServletRequest request) throws IOException {super(request); this.body = RequestReadUtils.read(request); } public String getBody() {return body; } @Override public ServletInputStream getInputStream() throws IOException {final ByteArrayInputStream bais = new ByteArrayInputStream(body.getBytes()); return new ServletInputStream() {...略}; } @Override public BufferedReader getReader() throws IOException {return new BufferedReader(new InputStreamReader(this.getInputStream())); }}

RequestReadUtils(网上抄的)
private static final int BUFFER_SIZE = 1024 * 8; public static String read(HttpServletRequest request) throws IOException {BufferedReader bufferedReader = request.getReader(); for (Enumeration iterator = request.getHeaderNames(); iterator.hasMoreElements(); ) {String type = iterator.nextElement(); System.out.println(type+" = "+request.getHeader(type)); }System.out.println(); StringWriter writer = new StringWriter(); write(bufferedReader,writer); return writer.getBuffer().toString(); } public static long write(Reader reader,Writer writer) throws IOException {return write(reader, writer, BUFFER_SIZE); } public static long write(Reader reader, Writer writer, int bufferSize) throws IOException{int read; long total = 0; char[] buf = new char[bufferSize]; while( ( read = reader.read(buf) ) != -1 ) {writer.write(buf, 0, read); total += read; }return total; }

2.2 定义Filter
@WebFilterpublic class TestFilter implements Filter{ @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain chain){HttpServletRequest request = (HttpServletRequest) servletRequest; HttpServletResponse response = (HttpServletResponse) servletResponse; MyRequestWrapper wrapper = WebUtils.getNativeRequest(request, MyRequestWrapper.class); chain.doFilter(wrapper == null ? new MyRequestWrapper(request) :wrapper,servletRequest); }}

三、遇到问题
使用的SpringBoot v2.1.x版本
1、Form提交无问题
2、获取RequestBody无问题
使用SpringBoot v2.2.0以上版本(包括v2.3.x)
1、Form提交无法获取参数
2、获取RequestBody无问题
四、问题排查
经过排查,v2.2.x对比v2.1.x的不同在于一下代码差异:
BufferedReader bufferedReader = request.getReader(); -----------------char[] buf = new char[bufferSize]; while( ( read = reader.read(buf) ) != -1 ) {writer.write(buf, 0, read); total += read; }

当表单提交时
1、v2.1.x无法read到内容,读取结果为-1
2、v2.2.x、v2.3.x能够读取到内容
当表单提交时(x-www-form-urlencoded),inputStream读取一次后后续不会触发wrapper的getInputStream操作,所以Controller无法获取到参数。
解决方案
MyRequestWrapper改造
public class MyRequestWrapper extends HttpServletRequestWrapper { private final String body; public MyRequestWrapper(HttpServletRequest request) throws IOException {super(request); this.body = getBodyString(request); } public String getBody() {return body; } public String getBodyString(final HttpServletRequest request) throws IOException {String contentType = request.getContentType(); String bodyString = ""; StringBuilder sb = new StringBuilder(); if (StringUtils.isNotBlank(contentType) && (contentType.contains("multipart/form-data") || contentType.contains("x-www-form-urlencoded"))) {Map parameterMap = request.getParameterMap(); for (Map.Entry next : parameterMap.entrySet()) {String[] values = next.getValue(); String value = https://www.it610.com/article/null; if (values != null) {if (values.length == 1) {value = values[0]; } else {value = Arrays.toString(values); }}sb.append(next.getKey()).append("=").append(value).append("&"); }if (sb.length() > 0) {bodyString = sb.toString().substring(0, sb.toString().length() - 1); }return bodyString; } else {return IOUtils.toString(request.getInputStream()); } } @Override public ServletInputStream getInputStream() throws IOException {final ByteArrayInputStream bais = new ByteArrayInputStream(body.getBytes()); return new ServletInputStream() {@Overridepublic boolean isFinished() {return false; }@Overridepublic boolean isReady() {return false; }@Overridepublic int read() {return bais.read(); }@Overridepublic void setReadListener(ReadListener readListener) {}}; } @Override public BufferedReader getReader() throws IOException {return new BufferedReader(new InputStreamReader(this.getInputStream())); }}

以上为个人经验,希望能给大家一个参考,也希望大家多多支持脚本之家。

    推荐阅读