多次获取body数据

工具类

import org.apache.commons.io.IOUtils;

import javax.servlet.ServletRequest;
import java.io.*;
import java.nio.charset.StandardCharsets;

/**
 * @author shuzhuo
 */
public class HttpHelper {

    /**
     * 获取 body 字符串数据
     *
     * @param request {@link ServletRequest}
     * @return
     */
    public static String getBodyString(ServletRequest request) {
        StringBuilder sb = new StringBuilder();
        try (InputStream inputStream = request.getInputStream();
             BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, StandardCharsets.UTF_8))) {
            String line;
            while ((line = reader.readLine()) != null) {
                sb.append(line);
            }
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        return sb.toString();
    }

    /**
     * 获取 body 字节数据
     *
     * @param request {@link ServletRequest}
     * @return
     */
    public static byte[] getBodyBytes(ServletRequest request) {
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        try {
            IOUtils.copy(request.getInputStream(), byteArrayOutputStream);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        return byteArrayOutputStream.toByteArray();
    }
}

重复request 包装类 RepeatedlyRequest

import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.ServletResponse;
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;

/**
 * @author shuzhuo
 */
public class RepeatedlyRequestWrapper extends HttpServletRequestWrapper {
    private final byte[] body;

    public RepeatedlyRequestWrapper(HttpServletRequest request, ServletResponse response) throws IOException {
        super(request);
        body = HttpHelper.getBodyString(request).getBytes(StandardCharsets.UTF_8);
    }

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

    @Override
    public ServletInputStream getInputStream() throws IOException {
        final ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(body);
        return new ServletInputStream() {
            @Override
            public int read() throws IOException {
                return byteArrayInputStream.read();
            }

            @Override
            public int available() throws IOException {
                return body.length;
            }

            @Override
            public boolean isFinished() {
                return false;
            }

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

            @Override
            public void setReadListener(ReadListener readListener) {

            }
        };
    }
}

过滤器 ChannelFilter

import org.springframework.stereotype.Component;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.util.Objects;

/**
 * @author shuzhuo
 */
@Component
@WebFilter(filterName = "channelFilter", urlPatterns = {"/*"})
public class ChannelFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) {
        try {
            RepeatedlyRequestWrapper requestWrapper = null;
            if (request instanceof HttpServletRequest) {
                requestWrapper = new RepeatedlyRequestWrapper((HttpServletRequest) request, response);
            }
            if (Objects.isNull(requestWrapper)) {
                chain.doFilter(request, response);
            } else {
                chain.doFilter(requestWrapper, response);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ServletException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void destroy() {
    }
}

测试

@PostMapping (value = "/aaa")
@ResponseBody
public Object aaa(@RequestBody JSONObject dto) {
    return dto;
}

可以看到是成功的