/*
     * @headerAndBody 包含消息头+消息体，包含SOH，不包含checksum域
     */
    public static String checkSum(String headerAndBody) {
        byte[] headerAndBodyBytes = headerAndBody.getBytes();
        
        int sum = 0;

        for (byte b : headerAndBodyBytes) {
            sum += b;
        }

        String rt = String.valueOf((sum) % 256);

        /*
         * 在模256之后需要转换成固定长度为3字符串
         */
        if (rt.length() == 1) {
            rt = "00" + rt;
        } else if (rt.length() == 2) {
            rt = "0" + rt;
        } else {
        }

        return rt;
    }
    
    public static String getGMTTime(){
        SimpleDateFormat foo = new SimpleDateFormat("yyyyMMdd-HH:mm:ss.SSS", Locale.ENGLISH);
        foo.setTimeZone(TimeZone.getTimeZone("GMT"));
        return foo.format(new Date());
    }
    
    public static String[] seperate(String msgStr){
        String[] tags=msgStr.split(BaseMsg.SOH);
        List<Integer> seqHead=new ArrayList<Integer>();
        List<Integer> seqTailer=new ArrayList<Integer>();
        int indexHead=0;
        int indexTail=0;
        boolean firstTail=true;
        if(tags.length<5){
            throw new InValidDataException("消息格式错误");
        }else{
                String tag=tags[0];
                String [] ts=tag.split("=");
                if(ts.length!=2){
                    throw new InValidDataException("消息格式错误");
                }
                String tagId=ts[0];
                if(!tagId.equals("8")){
                    throw new InValidDataException("消息格式错误");
                }
                String tag1=tags[1];
                String [] ts1=tag1.split("=");
                if(ts1.length!=2){
                    throw new InValidDataException("消息格式错误");
                }
                String tagId1=ts1[0];
                if(!tagId1.equals("9")){
                    throw new InValidDataException("消息格式错误");
                }
                String tag2=tags[2];
                String [] ts2=tag2.split("=");
                if(ts2.length!=2){
                    throw new InValidDataException("消息格式错误");
                }
                String tagId2=ts2[0];
                if(!tagId2.equals("35")){
                    throw new InValidDataException("消息格式错误");
                }
                String tag3=tags[tags.length-1];
                String [] ts3=tag3.split("=");
                if(ts3.length!=2){
                    throw new InValidDataException("消息格式错误");
                }
                String tagId3=ts3[0];
                if(!tagId3.equals("10")){
                    throw new InValidDataException("消息格式错误");
                }
        }
        
        for(int i=0;i<tags.length;i++){
            String tag=tags[i];
            String [] ts=tag.split("=");
            if(ts.length!=2){
                throw new InValidDataException("消息格式错误");
            }
            String tagId=ts[0];
            if(allHead.contains(tagId)){
                seqHead.add(i);
                indexHead=i;
            }
            if(allTailer.contains(tagId)){
                seqTailer.add(i);
                if(firstTail){
                    indexTail=i;
                }
                firstTail=false;
            }
        }
        for(int i=0;i<seqHead.size()-1;i++){
            if(seqHead.get(i+1)-seqHead.get(i)!=1){
                throw new InValidDataException("消息格式错误");
            }
        }
        for(int i=0;i<seqTailer.size()-1;i++){
            if(seqTailer.get(i+1)-seqTailer.get(i)!=1){
                throw new InValidDataException("消息格式错误");
            }
        }
        int index=0;
        indexHead++;
        while(indexHead-->0){
            index=msgStr.indexOf("=", index+1);
        }
        index=msgStr.indexOf(BaseMsg.SOH, index);
        String head=msgStr.substring(0, index+1);
        int indexT=0;
        while(indexTail-->0){
            indexT=msgStr.indexOf("=",indexT+1);
        }
        indexT=msgStr.indexOf(BaseMsg.SOH, indexT);
        String tailer=msgStr.substring(indexT+1);
        String body=msgStr.substring(index+1, indexT+1);
        String[]sep=new String[3];
        sep[0]=head;
        sep[1]=body;
        sep[2]=tailer;
        return sep;
    }

checkSum计算10的值，

seperate将消息，分割为头，体，尾