java double 转换成 #.00 格式String 防止科学计数法

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 public static String double2String(Double d){
        return d==null? "0.00" : String.format("%.2f", d);
    }

在报文前边加8位长度

public String dealMessageBeforeWriting(String reqMsg)  {

        String length = "";
        try {
            length = String.format("%1$08d", reqMsg.getBytes("UTF-8").length);
        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        reqMsg = length + reqMsg;

        return reqMsg;
    }