数据传输协议protobuf的使用转

2020年10月28日 0条评论 224次阅读 0人点赞慕容

转自：https://www.cnblogs.com/gxyandwmm/p/11437417.html

一、交互流程图：

总结点：

问题：一开始设置http请求中content-type 设置为默认文本格式，导致使用http传输body信息的时候必须进行base64加密才可以传输，这样会导致增加传输1/3的数据量，

解决：使用流进行写入与读取，客户端请求中使用inputStream，服务端使用outputStream，http数据格式设置application/octet-stream；

二、示例代码：

服务端：

    private static void sendProtobufObject() throws Exception {
        org.chench.test.protobuf.OriginalData.Tdata.Rdata.Builder rdata = org.chench.test.protobuf.OriginalData.Tdata.Rdata.newBuilder();
        rdata.setV(101);
        rdata.setC("got doub");
        rdata.setR("test");
        rdata.setRS("rolen1");

        org.chench.test.protobuf.OriginalData.Tdata.Builder tdata = org.chench.test.protobuf.OriginalData.Tdata.newBuilder();
        tdata.setDatatype("aias");
        tdata.setIdVer("An1");
        tdata.setTrans("y");
        tdata.setRk("uZkmGAC=");
        tdata.addData(rdata);

        org.chench.test.protobuf.OriginalData.Tdata staff = tdata.build();
        byte[] buff = staff.toByteArray();

        //String source = new String(buff, "utf-8");

        byte[] payload = Encrypt(buff, "1234567890123456");

        //封装最外层数据
        org.chench.test.protobuf.messages.Amsg.Builder msg = org.chench.test.protobuf.messages.Amsg.newBuilder();
        msg.setContentValue("zYaIF1toXcw=");
        msg.setContentId("1HEABwINCAcOAQ==");
        msg.setVersionType("1001");
        msg.setPayload(ByteString.copyFrom(payload));


        URL url = new URL("http://127.0.0.1:9090/api/v1/suss_msg");
        HttpURLConnection connection = (HttpURLConnection)url.openConnection();
        connection.setConnectTimeout(15000);
        connection.setReadTimeout(60000);
        connection.setRequestMethod("POST");
        connection.setDoInput(true);
        connection.setDoOutput(true);
        connection.setUseCaches(false);
        connection.setInstanceFollowRedirects(true);
        connection.setRequestProperty("Content-Type", "application/octet-stream");

        //connection.connect();

        // 通过连接对象获取一个输出流
        OutputStream  os = connection.getOutputStream();
        // 通过输出流对象将参数写出去/传输出去,它是通过字节数组写出的
        os.write(msg.build().toByteArray());

        ///msg.build().writeTo(connection.getOutputStream());
        os.flush();
        os.close();
        int responseCode = connection.getResponseCode();// 调用此方法就不必再使用conn.connect()方法
        if (responseCode == 200) {

        }else
        {

        }
        connection.disconnect();// 关闭连接

客户端：

public Object processRequest(HttpServletRequest request) throws Exception
    {
        //new BASE64Decoder().decodeBuffer(requestBody)
        InputStream inputStream = request.getInputStream();
        messages.Amsg msg = messages.Amsg.parseFrom(inputStream);
        System.out.println("----------header-------------");
        System.out.println(msg.getContentValue());
        System.out.println(msg.getContentId());
        System.out.println(msg.getVersionType());
        System.out.println("----------payload-------------");
        byte[] data = Decrypt(msg.getPayload().toByteArray(), "1234567890123456");
        OriginalData.Tdata tdata = OriginalData.Tdata.parseFrom(data);
        System.out.println("----------tdate:");
        System.out.println(tdata.getAid());
        System.out.println(tdata.getDatatype());
        System.out.println(tdata.getIdVer());
        System.out.println(tdata.getTrans());
        System.out.println(tdata.getRk());
        System.out.println("----------rdate:");
        OriginalData.Tdata.Rdata rdata = tdata.getData(0);
        System.out.println(rdata.getA());
        System.out.println(rdata.getP());
        System.out.println(rdata.getM());
        System.out.println(rdata.getGJ());
        return null;
    }

Schema：

syntax = "proto3";
package msg;
option java_package = "org.chench.test.protobuf";
option java_outer_classname = "messages";
message Amsg {
    string content_value = 1;
    string content_id = 2;             //appid
    string version_type = 3;           //协议类型
    bytes payload = 4;                //加密数据
}

syntax = "proto3";
package originaldata;
option java_package = "org.chench.test.protobuf";
option java_outer_classname = "OriginalData";
message Tdata {
    string aid = 1;                   
    string datatype = 2;
    string hk = 3;                   
    string id_ver = 4;                
message Rdata{
     int32 V = 1;
     int32 oo = 2;            //为区分大小写，原小写字母变为双小写
     string pp = 3;
}
    repeated Rdata data = 5;           //rdata对含数据请参考安全热更请求数据
}

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数据传输协议protobuf的使用转

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