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dc-invoke project for Spring Boot
There is a newer version: 0.5.4
package com.github.dc.invoke.wrapper;

import lombok.Getter;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.StringUtils;

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;
import java.util.Arrays;
import java.util.Map;

/**
 * @author PeiYuan
 */
@Getter
public class ReuseHttpServletRequest extends HttpServletRequestWrapper {
    private final String body;

    /**
     * Constructs a request object wrapping the given request.
     *
     * @param request The request to wrap
     * @throws IllegalArgumentException if the request is null
     */
    public ReuseHttpServletRequest(HttpServletRequest request) throws IOException {
        super(request);
        body = getBodyString(request);
    }

    protected 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 = 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 new String(IOUtils.toByteArray(request.getInputStream()));
        }
    }

    @Override
    public ServletInputStream getInputStream() throws IOException {
        final ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(body.getBytes());
        ServletInputStream servletInputStream = new ServletInputStream() {
            @Override
            public boolean isFinished() {
                return false;
            }
            @Override
            public boolean isReady() {
                return false;
            }
            @Override
            public void setReadListener(ReadListener readListener) {
            }
            @Override
            public int read() throws IOException {
                return byteArrayInputStream.read();
            }
        };
        return servletInputStream;
    }

    @Override
    public BufferedReader getReader() throws IOException {
        return new BufferedReader(new InputStreamReader(this.getInputStream()));
    }

}