SpringBoot 接口加密解密，新姿势！_spring boot 请求加解密-CSDN博客
2.2 request流只能读取一次的问题
2.2.1 问题：
在接口调用链中，request的请求流只能调用一次，处理之后，如果之后还需要用到请求流获取数据，就会发现数据为空。
比如：使用了filter或者aop在接口处理之前，获取了request中的数据，对参数进行了校验，那么之后就不能在获取request请求流了
2.2.2 解决办法
继承HttpServletRequestWrapper，将请求中的流copy一份，复写getInputStream和getReader方法供外部使用。每次调用后的getInputStream方法都是从复制出来的二进制数组中进行获取，这个二进制数组在对象存在期间一致存在。使用Filter过滤器，在一开始，替换request为自己定义的可以多次读取流的request。这样就实现了流的重复获取
InputStreamHttpServletRequestWrapper
package xyz.hlh.cryptotest.utils;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.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;/*** 请求流支持多次获取*/
public class InputStreamHttpServletRequestWrapper extends HttpServletRequestWrapper {/*** 用于缓存输入流*/private ByteArrayOutputStream cachedBytes;public InputStreamHttpServletRequestWrapper(HttpServletRequest request) {super(request);}@Overridepublic ServletInputStream getInputStream() throws IOException {if (cachedBytes == null) {// 首次获取流时，将流放入 缓存输入流 中cacheInputStream();}// 从 缓存输入流 中获取流并返回return new CachedServletInputStream(cachedBytes.toByteArray());}@Overridepublic BufferedReader getReader() throws IOException {return new BufferedReader(new InputStreamReader(getInputStream()));}/*** 首次获取流时，将流放入 缓存输入流 中*/private void cacheInputStream() throws IOException {// 缓存输入流以便多次读取。为了方便, 我使用 org.apache.commons IOUtilscachedBytes = new ByteArrayOutputStream();IOUtils.copy(super.getInputStream(), cachedBytes);}/*** 读取缓存的请求正文的输入流* <p>* 用于根据 缓存输入流 创建一个可返回的*/public static class CachedServletInputStream extends ServletInputStream {private final ByteArrayInputStream input;public CachedServletInputStream(byte[] buf) {// 从缓存的请求正文创建一个新的输入流input = new ByteArrayInputStream(buf);}@Overridepublic boolean isFinished() {return false;}@Overridepublic boolean isReady() {return false;}@Overridepublic void setReadListener(ReadListener listener) {}@Overridepublic int read() throws IOException {return input.read();}}}
HttpServletRequestInputStreamFilter
package xyz.hlh.cryptotest.filter;import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
import xyz.hlh.cryptotest.utils.InputStreamHttpServletRequestWrapper;import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;import static org.springframework.core.Ordered.HIGHEST_PRECEDENCE;/*** @author HLH* @description:* 请求流转换为多次读取的请求流 过滤器* @email 17703595860@163.com* @date : Created in 2022/2/4 9:58*/
@Component
@Order(HIGHEST_PRECEDENCE + 1) // 优先级最高
public class HttpServletRequestInputStreamFilter implements Filter {@Overridepublic void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {// 转换为可以多次获取流的requestHttpServletRequest httpServletRequest = (HttpServletRequest) request;InputStreamHttpServletRequestWrapper inputStreamHttpServletRequestWrapper = new InputStreamHttpServletRequestWrapper(httpServletRequest);// 放行chain.doFilter(inputStreamHttpServletRequestWrapper, response);}
}
)
