解决HttpServletRequest流只能读取一次

import org.apache.tomcat.util.http.fileupload.IOUtils;

import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.*;

public class ReadTwiceHttpServletRequestWrapper extends HttpServletRequestWrapper {

    private ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
    public ReadTwiceHttpServletRequestWrapper(HttpServletRequest request) {
        super(request);
        try {
            request.setCharacterEncoding("UTF-8");

            IOUtils.copy(request.getInputStream(), outputStream);

        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public BufferedReader getReader() throws IOException {
        return new BufferedReader(new InputStreamReader(new ByteArrayInputStream(outputStream.toByteArray())));
    }

    @Override
    public ServletInputStream getInputStream() throws IOException {
        final ByteArrayInputStream inputStream = new ByteArrayInputStream(outputStream.toByteArray());
        return new ServletInputStream() {

            @Override
            public int readLine(byte[] b, int off, int len) throws IOException {
                return inputStream.read(b, off, len);
            }

            @Override
            public boolean isFinished() {
                return inputStream.available() > 0;
            }

            @Override
            public boolean isReady() {
                return true;
            }

            @Override
            public void setReadListener(ReadListener arg0) {
                // TODO Auto-generated method stub
            }

            @Override
            public int read() throws IOException {
                return inputStream.read();
            }
        };
    }

    public void setBody(String body) {
        outputStream = new ByteArrayOutputStream();
        try {
            outputStream.write(body.getBytes());
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally {
            if(outputStream != null){
                try{
                    outputStream.close();
                }catch (Exception ee){
                    ee.printStackTrace();
                }
            }
        }
    }

    public String getBody() {
        String str = new String(outputStream.toByteArray());
        if(outputStream != null){
            try{
                outputStream.close();
            }catch (Exception e){
                e.printStackTrace();
            }
        }
        return str;
    }

}

package com.wantup.filter;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;

public class ReadTwiceFilter implements Filter {

    @Override
    public void destroy() {
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {

        ReadTwiceHttpServletRequestWrapper readTwiceHttpServletRequestWrapper = new ReadTwiceHttpServletRequestWrapper(
                (HttpServletRequest) request);

        String newBody = readTwiceHttpServletRequestWrapper.getBody();
        readTwiceHttpServletRequestWrapper.setBody(newBody);
        chain.doFilter(readTwiceHttpServletRequestWrapper, response);
    }

    @Override
    public void init(FilterConfig arg0) throws ServletException {
    }
}

 @Bean
  public FilterRegistrationBean indexFilterRegistration() {
    FilterRegistrationBean registration = new FilterRegistrationBean(new ReadTwiceFilter());
    return registration;
  }

参考链接: