解決spring 處理request.getInputStream()輸入流只能讀取一次問題

一般我們會在InterceptorAdapter攔截器中對請求進行驗證

正常普通接口請求，request.getParameter()可以獲取，能多次讀取

如果我們的接口是用@RequestBody來接受數據，那么我們在攔截器中

需要讀取request的輸入流 ，因為 ServletRequest中getReader()和getInputStream()只能調用一次

這樣就會導致controller 無法拿到數據。

解決方法 ：

1、自定義一個類 BodyReaderHttpServletRequestWrapper.java

import java.io.BufferedReader;import java.io.ByteArrayInputStream;import java.io.IOException;import java.io.InputStreamReader;import javax.servlet.ReadListener;import javax.servlet.ServletInputStream;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletRequestWrapper;import org.springframework.util.StreamUtils;/** * @author WBG * @date 2020/6/22 10:42 * @describe */public class BodyReaderHttpServletRequestWrapper extends HttpServletRequestWrapper{ private byte[] requestBody = null;//用于將流保存下來 public BodyReaderHttpServletRequestWrapper(HttpServletRequest request) throws IOException { super(request); requestBody = StreamUtils.copyToByteArray(request.getInputStream()); } @Override public ServletInputStream getInputStream() throws IOException { final ByteArrayInputStream bais = new ByteArrayInputStream(requestBody); return new ServletInputStream() { @Override public int read() throws IOException { return bais.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(getInputStream())); }}

2、自定義 MyFilter 繼承Filter

import javax.servlet.*;import javax.servlet.http.HttpServletRequest;import java.io.BufferedReader;import java.io.IOException;/** * @author WBG * @date 2020/6/22 14:32 * @describe */public class MyFilter implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { System.out.println('開始'); } @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { ServletRequest requestWrapper=null; if(request instanceof HttpServletRequest) { requestWrapper=new BodyReaderHttpServletRequestWrapper((HttpServletRequest)request); } if(requestWrapper==null) { chain.doFilter(request, response); }else { System.out.println('------------------------------請求報文----------------------------------'); System.out.println(getParamsFromRequestBody((HttpServletRequest) requestWrapper)); System.out.println('------------------------------請求報文----------------------------------'); chain.doFilter(requestWrapper, response); } } /* * * 獲取請求體內容 * @return * @throws IOException */ private String getParamsFromRequestBody(HttpServletRequest request) throws IOException { BufferedReader br = null; String listString = ''; try { br = request.getReader(); String str = ''; while ((str = br.readLine()) != null) { listString += str; } } catch (IOException e) { e.printStackTrace(); } return listString; } @Override public void destroy() { System.out.println('destroy'); }}

3、web.xm配置過濾器

<!--定義過濾器--> <filter> <!--定義過濾器攔截URL地址--> <filter-name>test2</filter-name> <!--過濾器的文件--> <filter-class>com.zhhy.hy2000interface.utils.filter.MyFilter</filter-class> </filter> <filter-mapping> <!--過濾器的名稱--> <filter-name>test2</filter-name> <!--過濾器負責攔截的URL--> <!-- /* 會把所有的請求攔截下來 --> <url-pattern>/*</url-pattern> </filter-mapping>

（如果是Springboot，使用注解即可）

以上這篇解決spring 處理request.getInputStream()輸入流只能讀取一次問題就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持好吧啦網。