解决在Filter中读取Request中的流后, 然后再Control中读取不到的做法

public class SessionFilter extends GenericFilterBean {
private static Logger log = LoggerFactory.getLogger(SessionFilter.class);

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

// 为了避免此次读取request流后面control读取不到
HttpServletRequest request = (HttpServletRequest) req;
HttpServletRequest requestWrapper = new BodyReaderHttpServletRequestWrapper(request);

。。。业务代码
if(null == requestWrapper) {
chain.doFilter(request, response);
} else {
chain.doFilter(requestWrapper, response);
}
}

}

}

package com.szkingdom.jros.va.util;

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.Charset;
import java.util.Enumeration;

/**
* Created by zengh on 2017/5/17.
*/
public class BodyReaderHttpServletRequestWrapper extends  HttpServletRequestWrapper {

private final byte[] body;

public BodyReaderHttpServletRequestWrapper(HttpServletRequest request) throws IOException {
super(request);
Enumeration e = request.getHeaderNames();
while (e.hasMoreElements()) {
String name = (String) 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 String getHeader(String name) {
return super.getHeader(name);
}

@Override
public Enumeration<String> getHeaderNames() {
return super.getHeaderNames();
}

@Override
public Enumeration<String> getHeaders(String name) {
return super.getHeaders(name);
}
}

package com.szkingdom.jros.va.util;

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

/**
* Created by zengh on 2017/5/17.
*/
public class HttpHelper {
/**
* 获取请求Body
*
* @param request
* @return
*/
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();
}
}