我在ParseJspUtils.getHtml组装html，再把html组装成邮件发出，所以只要能生成转化的html就可以，不需要返回。
public class ParseJspUtils {

/**
 * 获取jsp产生的html
 * @param path
 * @param data
 * @return
 * @throws Throwable
 */
public static Map<String,Object> getHtml(String path,Map<String,Object> data){
    Map<String,Object> result = new HashMap<String,Object>();
    try {

//多线程这里会报空指针异常 　　
　　　　　HttpServletResponse response = Mvcs.getResp();
HttpServletRequest request = Mvcs.getReq();

        RequestDispatcher rd = request.getRequestDispatcher(path);

        ByteArrayOutputStream os = new ByteArrayOutputStream();
        final PrintWriter pw = new PrintWriter(new OutputStreamWriter(os,
               "UTF-8"));
       HttpServletResponse rep = new HttpServletResponseWrapper(response) {
            public PrintWriter getWriter() throws IOException {
                return pw;
            }
        };

        request.setAttribute("obj", data);
        rd.include(request, rep);
        pw.flush();
        result.put(MainModule.JTABLE_RESULT_KEY, MainModule.JTABLE_RESULT_VALUE_OK);
        result.put("html", os.toString("UTF-8"));
    } catch (Exception e) {
       result.put(MainModule.JTABLE_RESULT_KEY, MainModule.JTABLE_RESULT_VALUE_ERROR);
       // TODO Auto-generated catch block
       e.printStackTrace();
    }

    return result;
}

}

@wendal 　我把代码修改了，把HttpServletRequest request,HttpServletResponse response传进去，发现
request.setAttribute("obj", data);　报下面的空指针异常，但打断点，发现传进来的request和response都不为空。
是不是由于多线程原因，导致HttpServletRequest在主线程结束后销毁了，导致新启动的线程request.setAttribute为空呢？
java.lang.NullPointerException
at org.apache.catalina.connector.Request.setAttribute(Request.java:1509)
at org.apache.catalina.connector.RequestFacade.setAttribute(RequestFacade.java:503)
at javax.servlet.ServletRequestWrapper.setAttribute(ServletRequestWrapper.java:284)