多次读取post请求中的流信息

package com.voole.config.web;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.Charset;

import javax.servlet.ServletRequest;

public class HttpHelper {
	
	 public static String getBodyString(ServletRequest request) {
	        StringBuilder sb = new StringBuilder();
	        InputStream inputStream = null;
	        BufferedReader reader = null;
	        try {
	            inputStream = request.getInputStream();
	            reader = new BufferedReader(new InputStreamReader(inputStream, Charset.forName("UTF-8")));
	            String line = "";
	            while ((line = reader.readLine()) != null) {
	                sb.append(line);
	            }
	        } catch (IOException e) {
	            e.printStackTrace();
	        } finally {
	            if (inputStream != null) {
	                try {
	                    inputStream.close();
	                } catch (IOException e) {
	                    e.printStackTrace();
	                }
	            }
	            if (reader != null) {
	                try {
	                    reader.close();
	                } catch (IOException e) {
	                    e.printStackTrace();
	                }
	            }
	        }
	        return sb.toString();
	    }
}

　这个是辅助的工具类

　

package com.voole.config.web;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
import java.util.Enumeration;

import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

public class BodyHttpServletRequestWrapper extends HttpServletRequestWrapper {

	private final byte[] body;

	public BodyHttpServletRequestWrapper(HttpServletRequest request) {
		super(request);
		Enumeration<String> e = request.getHeaderNames();

		while (e.hasMoreElements()) {
			String name = e.nextElement();
			String value = request.getHeader(name);
		}
		body = HttpHelper.getBodyString(request).getBytes(Charset.forName("UTF-8"));
	}

	@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 void setReadListener(ReadListener listener) {
				
			}
			
			@Override
			public boolean isReady() {
				return false;
			}
			
			@Override
			public boolean isFinished() {
				return false;
			}
		};
	}

}

　　对request的封装

package com.voole.config.web;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletInputStream;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;

import org.apache.commons.io.IOUtils;
import org.springframework.stereotype.Component;

@Component
@WebFilter(urlPatterns="/*",filterName="vooleFilter")
public class VooleFilter implements Filter{
	

	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
			throws IOException, ServletException {
		HttpServletRequest req = (HttpServletRequest)request;
		BodyHttpServletRequestWrapper body = new BodyHttpServletRequestWrapper(req);
		System.out.println(req.getRequestURI());
		String appid = req.getParameter("appid");
		System.out.println("\nVooleFilter appid "+appid);
		System.out.println(IOUtils.toString(body.getInputStream()));
		chain.doFilter(body, response);
	}

}

　　在过滤器中获取后，后续使用的都是封装后的request