m way camera

HTTPS configuration is divided into one-way and two-way connections, one-way connection only requires the Server installation certificate, the client does not need, two-way connection requires both the server and the client to install the certificateOne, one-way HTTPS connec

In the middle of a complete interruption of the entire process, we do not know what the whole thing is going on. It can also cause resource leaks, and programmers will not get a predetermined result (even if the result of failure is recorded in the programmer's format).In addition, internal atomic operations do not have to log errors (otherwise the same file error, there will be too many records, but can no longer scrutiny), the external logical result error can be recorded.This

1.1.API mode 1.1.1.Development Stepsgoal : use MyBatis to query All records of the T_person table from the database. MyBatis can also use the direct API To configure mappings between records in a database and Java objects, as well as various other required configurations. You no longer need to use any XML configuration file at this time. Because the API is used to establish a mapping relationship,theMapper interface does not need to add any annotations. Use The steps to develop a database appli

I. TCP three-way handshake and four-way handshake Flag space: Syn (synchronous online) Ack (acknowledgement confirmation) Psh (push transfer) FIN (finish) RST (reset) URG (Urgent urgent) Sequence Number: Sequence Number (sequential number) -- seq Acknowledge number (confirmation number) -- ack Format of the first handshake packet: The second handshake packet forma

Tags: network socket three-way handshake Three-way handshake:TCP creation requires three handshakes,First, the client sends a connection request packet. The server segment receives the connection and replies to the ACK packet, and allocates resources for the connection. After the client receives the ACK packet, it also generates an ACK packet to the server segment and allocates resources so that the TCP co

userview--the second way (avoid set saturation in the first way), Java code implementation based on spark operatortest DataJava Code1 PackageCom.hzf.spark.study;2 3 ImportJava.util.Map;4 ImportJava.util.Set;5 6 Importorg.apache.spark.SparkConf;7 ImportOrg.apache.spark.api.java.JavaPairRDD;8 ImportOrg.apache.spark.api.java.JavaRDD;9 ImportOrg.apache.spark.api.java.JavaSparkContext;Ten Importorg.apache.spark

TCP three-way handshake and four-way handshake 1. Establish a connection protocol (three-way handshake) (1) the client sends a TCP packet with SYN flag to the server. This is packet 1 during the three-way handshake. (2) The server responds to the client. This is the first packet in the three-

Saved In a fierce battle, the Captain suddenly found an enemy plane diving down to the position. As usual, do not hesitate to lie down when an enemy plane is found to dive. But the captain did not immediately lie down, and he found a soldier standing four or five meters away from him. He did not care much about it. A fish jumped to the air and pressed the soldiers tightly under him. At this time, the splash of dirt fell onto them. The captain patted the dust on his body and looked back. He was

When learning the network basics, the transport layer protocols include TCP and UDP; In Linux network programming, we use the socket API to implement network communication. So: How does the status of Socket API correspond to that of TCP? We can see through: How to complete three handshakes and four waves in Socket System calls: Sock_dgram, that is, the connect operation knowledge in UDP registers the IP address and port information of the other machine in the kernel, and does not establish a l

I think this is the difference between marketing ideas. The so-called ideas determine the way out and the Way OutArticle marketing rather than soft text MarketingFirst of all, I want to talk about it.C. I prefer to call it article marketing for soft-article marketing. When talking about Soft Text marketing, you may first think about how to embed the product information to be promoted into the chapter. Howev

Two-way merge Insert merge in-situ merge, two-way merge sort Insert and merge The time complexity of Merge Sorting is O (nlgn), and the space complexity is O (n ); However, sorting based on a single record that is merged by two is not particularly advocated. A common improvement is to combine insertion sorting, that is, we first use the insert sort to obtain a long ordered subsequence, and then merge the

Get data with Get methodThe data in the original project was obtained by post, the acquisition process is, now is the first angular in the router routing configuration when---html-ctrl three parties, First, click Submit in HTML to find the relevant ctrl in the angular front-end route, and then CTRL to invoke the appropriate method.Take login As an example: it invokes the login method in service, and the Post method is used in the middle of login$http. Post ('/signin ', {Username:username,Passwor

TCP three-way handshake1. When a connection is established, the client sends a SYN packet to the server and generates an sequential number seq number = K, waiting for the server to confirm.2. After the server receives a request, confirm the online information, send the confirmation code ACK = k + 1, Syn packet to the client, and generate an sequence number seq number = Q.3. Check whether the Ack is correct after the client receives the confirmation in

One-way certification: 1.clinet--server2.clinet-->server1. The client takes the server's certificate from the server and verifies the certificate through the company's CA to confirm that the server is real;2. Remove the public key from the server's certificate, A key that is generated on the client side is encrypted (the key is the symmetric key). Sends the encrypted key to the server side. The server side decrypts the data with its private key, and t

Tutorial on using Baidu map along the way:1. First open the Baidu map APP,Click avatar in the upper left corner;2. Click"Traveling along the way"Option;3. On the "same journey" page, click"I want to create a group"Option. If the password already exists, you can enter the password to quickly join the group chat;4. After entering the group, you will be given a group password. You

Introduction Fact table A foreign key that holds measures and dimension tables. Dimension table Angle, classification. Time dimension, Region dimension, State dimension. The old way Select * from Order o inner join District D to O.discode=d.discode inner join address A on O.ADDRESSID=A.A Ddressid where o.createdate > ' 2012-2-5 ' and O.createdate Writing dead stored procedures, adding conditions is difficult. If the condition changes, or ther

Previous post: tomcat7.0.55 Configuring one-way and two-way HTTPS connectionsJust a brief configuration of the HTTPS, there are many problems are not resolved, this article to resolve these filesStart by following this article:Widows using OpenSSL to generate a certificate, since TOMCAT7 currently only supports JKS, PKCS11, PKCS12 keystore, below we convert the resulting certificate into these formatsTo sav

test time are reduced. Writing several relatively small, self-contained components is easier than writing a single chunk of code. You can design, write simple components, unit test them, and forget about them--you don't have to constantly change the code you have when you add new code. The orthogonal approach can also facilitate reuse. If components have clear and specific, well-defined responsibilities, they can be combined with new components in a way