解決 springweb Filter 讀取request body miss body

package com.lb.demo.listener;

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;
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public class BodyReaderHttpServletRequestWrapper extends HttpServletRequestWrapper {

    private final byte[] body; // 用於保存讀取body中數據

    public BodyReaderHttpServletRequestWrapper(HttpServletRequest request) throws IOException {
        super(request);
        StringBuffer sb=new StringBuffer();
        String temp=null;
        BufferedReader bufferread = request.getReader();
        while((temp=bufferread.readLine())!=null) {
            sb.append(temp);
        }
        body = sb.toString().getBytes();
        bufferread.close();
    }

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

    @Override
    public ServletInputStream getInputStream() throws IOException {
        final ByteArrayInputStream bais = new ByteArrayInputStream(body);
        return new ServletInputStream() {

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

            @Override
            public boolean isFinished() {
                // TODO Auto-generated method stub
                return false;
            }

            @Override
            public boolean isReady() {
                // TODO Auto-generated method stub
                return false;
            }

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

            }
        };
    }
}

package com.lb.demo.listener;

import java.io.BufferedReader;
import java.io.IOException;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpFilter;
import javax.servlet.http.HttpServletRequest;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.stereotype.Component;
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@Component
public class MyServletFilter extends HttpFilter {

    String param = "";
    private Log log = LogFactory.getLog(MyServletFilter.class);

    public void destroy() {
        // TODO Auto-generated method stub

    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        ServletRequest requestWrapper = null;
        requestWrapper = new BodyReaderHttpServletRequestWrapper((HttpServletRequest) request); // 替換
        param = this.getBodyString(requestWrapper.getReader());
        log.info("filter讀取body中的參數>>>>>>>>>" + param);
        chain.doFilter(requestWrapper, response);
    }

    public static String getBodyString(BufferedReader br) {
        String inputLine;
        String str = "";
        try {
            while ((inputLine = br.readLine()) != null) {
                str += inputLine;
            }
            br.close();
        } catch (IOException e) {
            System.out.println("IOException: " + e);
        }
        return str;
    }
}