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Y o k a Study hut Y o k a Study hut I C P Registration number: Zhejiang I C P Preparation 2 0 2 3 0 0 3 3 0 8 No. 1 P r o u d l y p u b l i s h e d w i t h H a l o ！ Home Article Archives Default Classification About the Basic Syntax of Page Regular Expressions: 1. Match some abbreviated characters. All characters except line breaks \ \ w Match all alphanumeric numbers, equivalent to [ a z A Z 0 9 _ ] \ \ W Match all non-alphanumeric numbers, i.e. symbols, equivalent to: [ ^ \ \ w ] \ \ d Match numbers: [ 0 9 ] \ \ D Match non-numbers: [ ^ \ \ d ] \ \ s Match all space characters, equivalent to: [ \ \ t \ \ n \ \ f \ \ r \ \ p ] \ \ S Match all non-space characters: . . . . 2 0 2 4 0 3 1 5 C o m m e n t s Some websites cannot be accessed during development (change h o s t ） 1 . Use first h t t p s : / / p i n g . c h i n a z . c o m website p i n g This URL 2. Find a low latency i p ， c m d Manual p i n g Is the connection normal? 3. Modify the computer h o s t document( C : \ \ W i n d o w s \ \ S y s t e m 3 2 \ \ d r i v e r s \ \ e t c ） Add the bottom like this; 2 0 3 . 2 0 8 . 5 0 . 1 6 1 d l . g o o g l e . c o m . . . 2 0 2 4 0 3 0 4 C o m m e n t s r e d i s Turn off persistence r e d i s There are two ways to persist 1. R D B 2 . A O F r e d i s Persistence is enabled by default, R D B 1 . closure R D B R D B The persistence rule is # s a v e 3 6 0 0 1 3 0 0 1 0 0 6 0 1 0 0 0 0 or # s a v e 3 6 0 0 1 # s a v e 3 0 0 1 0 0 # s a v e 6 0 1 0 0 0 0 First comment out the original rules, and then s a . . . 2 0 2 4 0 1 2 0 C o m m e n t s j a v a implement s h script i n t e x i t C o d e ; S t r i n g B u i l d e r r e s u l t = n e w S t r i n g B u i l d e r ( ) ; t r y } s t a g e s p u b l i . . . 2 0 2 3 0 4 1 8 C o m m e n t s s p r i n g b o o t Configuration file loading priority: f i l e : . / c o n f i g / （ Under the project root path c o n f i g Folder) f i l e : . / （ Project root path) c l a s s p a t h : / c o n f i g / （ Under the classpath c o n f i g Folder) c l a s s p a t h : / （ Classpath) Project root path: p o m The path classpath where the file is located: r e s o u r c e s The directory with high priority configuration will cover the low-priority. . . 2 0 2 3 0 4 1 7 C o m m e n t s n a c o s Use and p o m Multi-environment 1. m a v e n rely c o m . a l i b a b a . c l o u d s p r i n g c l o u d s t a r t e r a l i b . . . 2 0 2 3 0 4 1 7 C o m m e n t s l o g b a c k File learning and examples can be printed to: Class method line number 2 0 2 3 0 4 1 4 C o m m e n t s o p e n f e i g n Use Interceptor 1. Define a F e i g n Client, add @ on the class F e i g n C l i e n t Annotation, used in annotation u r l Specify the called domain name or i p ， use c o n f i g u r a t i o n Specify one F e i g n C o n f i g Class 2. F e i g n C o n f i g This class contains a @ B e a n Method, this method returns an implementation R e q u e s t I n t e r c e p t o r interceptor. 3 . . . . 2 0 2 3 0 4 1 3 C o m m e n t s s p r i n g b o o t Implementation of global exception capture in 1. Define a C o m m o n E x c e p t i o n Class 2. Define a global exception capture class G l o b a l E x c e p t i o n H a n d l e r ， Add to @ R e s t C o n t r o l l e r A d v i c e Annotation code: @ G e t t e r p u b l i c c l a s s C o m m o n E x c e p t i o n e x t e n d s R u n t i m e E x c e p t i o n { . . . 2 0 2 3 0 4 1 3 C o m m e n t s use m y b a t i s p l u s When the creation time and update time need to be automatically generated code: Implementation M e t a O b j e c t H a n d l e r Just class @ C o m p o n e n t p u b l i c c l a s s A u t o D a t e T i m e H a n d l e r i m p l e m e n t s M e t a O b j e c t H a n d l e r { @ O v e r r i d e p u b l i c v o i d i n s e r t F i l l ( M e t a O b j e c t m . . . 2 0 2 3 0 4 1 3 C o m m e n t s m y b a t i s Automatically generated m a p p e r and D O File dependencies: o r g . m y b a t i s . g e n e r a t o r m y b a t i s g e n e r a t o r c o r e 2 0 2 3 0 4 1 3 C o m m e n t s use h t t p c l i e n t hour, g e t Method cannot set requested rewrite h t t p g e t method: i m p o r t o r g . a p a c h e . h t t p . c l i e n t . m e t h o d s . H t t p E n t i t y E n c l o s i n g R e q u e s t B a s e ; i m p o r t j a v a . n e t . U R I ; p u b l i c c l a s s H t t p G e t e x t e n d s H t t p E n t i t y E n c l o s i n g R . . . 2 0 2 3 0 4 1 3 C o m m e n t s W L A N Wireless LAN W L A N ， Wireless LAN I E E E 8 0 2 . 1 1 yes W L A N General standards, W I F I Created in 8 0 2 . 1 1 , these two are equivalent in most scenarios. W I F I 5 5 G H z 1 3 0 0 M b i t / s 8 0 2 . 1 1 a c w a v e 1 W I F I 5 5 G H z 6 . 9 G b i t / s 8 0 2 . 1 1 a c w a v e . . . 2 0 2 3 0 3 1 5 C o m m e n t s w e b s o c k e t Test tool download link h t t p s : / / b l o g . c s d n . n e t / o p e n o w n w o r l d / a r t i c l e / d e t a i l s / 9 5 1 7 8 5 8 3 . . . 2 0 2 3 0 3 0 8 C o m m e n t s J a c k s o n Probability appears b e a n Turn to j s o n I don't know why the class name was added, there is no problem with the local test, and after conversion, it contains all attributes. j s o n String, no class name. There is a probability that it will occur when deployed, but the reason for it will be unknown. . . . 2 0 2 3 0 3 0 6 C o m m e n t s Dental reading process record 2 0 2 2 1 2 2 4 1 7 1 7 5 8 . 9 7 Half of the upper left tooth fell off during the meal. It happened that the teeth were getting worse and worse recently, and many of them needed to be repaired, so I hung up the ordinary number of Zhejiang University Dental Weekend, and the expert number was completely impossible. When I registered, I didn’t know which department I went to, so I just went to the oral restoration department. After I went there, I got the number and asked the doctor to do an overall examination and took a film. The doctor told me all the teeth that need repair and the corresponding plan. The upper left tooth needs a root canal. . . . 2 0 2 3 0 3 0 6 C o m m e n t s D H C P Message type d i s c o v e r Broadcasting, used to discover the current network D H C P server o f f e r Unicast, server allocation i p To the client r e q u e s t Broadcast, the client informs the server that it will use this i p a c k Unicast, server answer, can be used i p . . . 2 0 2 3 0 3 0 3 C o m m e n t s A C L Some concepts of A C L ， Access control list through A C L Implement the identification and control of messages in the network. A C L Depend on p e r m i t and d e n y Compositions to match i p Source in the packet i p Address, Purpose i p Address, protocol type, source destination port and other elements. r u l e i d ， Rule number, A C L Each rule of , has a corresponding number , when assigning the number, the step size (difference) of the adjacent rule is 5 . When assigning a new rule number, use greater than when. . . . 2 0 2 3 0 3 0 3 C o m m e n t s S T P Some concepts of agreement S T P protocol, s p a n n i n g t r e e p r o t o c o l ， Spanning tree protocol to solve the loop problem of layer 2 B I D ， bridge I D ， b r i d g e I D ， By 1 6 b i t Bridge priority and 4 8 b i t The bridge M A C Address composition; B I D The smallest device is elected as the root bridge, the default value is 3 2 7 6 9, which can be modified but must be multiples of 4 0 9 6, and compare when the priority is the same M A C The smallest address is the root. . . . 2 0 2 3 0 3 0 2 C o m m e n t s Subnet division calculation and judgment i p Whether the communication can distinguish the network number from the host number is the mask. The part with the mask of 1 is the network number, for example: 1 7 2 . 1 6 . 1 0 . 1 / 1 6 Network address: 1 7 2 . 1 6 . 0 . 0 / 1 6 Broadcast address: 1 7 2 . 1 6 . 2 5 5 . 2 5 5 / 1 6 I P Number of addresses: Calculated according to the host number, 2 is available to the power of 16 I P Number: 2 of 1 6th power available I P Range: 1 7 2 . 1 6 . 0 . 1 / 1 6 1 7 2 . 1 6 . 2 5 5 . . . . 2 0 2 3 0 3 0 2 C o m m e n t s O S P F Some memory concepts O S P F （ o p e n s h o r t e s t p a t h f i r s t ， Open shortest path priority) Link state routing protocol, the interaction between routers is L S information, L S yes O S P F Key information that can perform topology and routing calculations normally. L S ： l i n k s t a t e L S A ： l i n k s t a t e a d v e r t i s e m e n t （ notice) L S D B ： l i n k s t a t e d . . . 2 0 2 3 0 3 0 2 C o m m e n t s The switch command error message comes from the Hsan document u n r e c o g n i z e d c o m m a n d f o u n d a t ‘ ’ p o s i t i o n Commands in this location cannot be resolved / No keywords i n c o m p l e t e c o m m a n d f o u n d a t ‘ ’ p o s i t i o n The command in this location is incomplete a m b i g u o u s c o m m a n d f o u n d a t ‘ ’ p o s i t i o n In this location. . . . 2 0 2 3 0 3 0 1 C o m m e n t s i p v 4 The meaning of the protocol message T T L ： 8 b i t ， The number of routers that the packet can pass through, the initial value is set by the source device, and the number is forwarded 1 each time until it is reduced to 0 and is discarded. Congestion caused by network loops can be avoided. . . . 2 0 2 3 0 3 0 1 C o m m e n t s Network hierarchy and corresponding protocols are used to give examples of the physical layer data link layer: P P P o E 、 E t h e r n e t 、 P P P Network layer: I P 、 I C M P 、 I G M P Transport layer: T C P 、 U D P Application layer: H T T P 、 D N S 、 T e l n e t 、 D H C P 、 F T P . . . 2 0 2 3 0 3 0 1 C o m m e n t s l i n u x Order p s It should be p r o c e s s s e a r c h ， Mainly for viewing server process information, generally used p s – e f and p s a u x Two, the data displayed in the two usages are slightly different, and the overall effect is not much different. General and g r e p Use commands in conjunction with, for example p s – e f | g r e p j a v a . j a r 。 in | Symbol, is a pipe symbol, indicating p s and g r e p The command is executed simultaneously. g . . . 2 0 2 3 0 2 2 8 C o m m e n t s Multicast introduction: The source host sends a copy of data, and the destination address is the multicast group address. All hosts in the group will receive the data. I G M P ： I n t e r n e t Group management protocol, a protocol used for interactive information between a host and a router. All hosts to join the multicast group and all routers connected to subnets with multicast hosts must be used I G M P 。 I G M P Messages cannot be forwarded by routing and can only be restricted to the local network segment. I G M P of . . . 2 0 2 3 0 2 2 8 C o m m e n t s I P Address Classification Address Classification: A Class address, 0 x x x x x x x . x x x x x x x x . x x x x x x x x . x x x x x x x x 0 . 0 . 0 . 0 1 2 7 . 2 5 5 . 2 5 5 . 2 5 5 / 8 B Class address, 1 0 x x x x x x . x x x x x x x x . x x x x x x x x . x x x x x x x x 1 2 8 . 0 . 0 . 0 1 9 1 . 2 5 5 . 2 5 5 . 2 5 5 / 1 6 C Class address, 1 . . . 2 0 2 3 0 2 2 8 C o m m e n t s * and * * * ： Match any file in the current directory * * ： Any file matching any directory and all subdirectories a p p l i c a t i o n * . y m l ： Match files that comply with this rule. . . . . 2 0 2 3 0 2 2 7 C o m m e n t s n e t t y Some source code knowledge (reprinted) h t t p s : / / b l o g . c s d n . n e t / w e i x i n _ 4 1 3 8 5 9 1 2 / a r t i c l e / d e t a i l s / 1 1 0 9 4 4 4 6 2 . . . 2 0 2 3 0 2 2 4 C o m m e n t s J a c k s o n U t i l s J a c k s o n U t i l s Tools, can be used directly i m p o r t c o m . f a s t e r x m l . j a c k s o n . a n n o t a t i o n . J s o n I n c l u d e ; i m p o r t c o m . f a s t e r x m l . j a c k s o n . c o r e . J s o n P a r s e r ; i m p o r t c o m . f a s t e r x m l . j a c k s o n . c o r . . . 2 0 2 3 0 2 2 3 C o m m e n t s p o m File examples and explanations s p r i n g b o o t Project p o m File example 2 0 2 3 0 2 2 3 C o m m e n t s If you are asked to design the network (reprint | network i p and m a c ） h t t p s : / / m p . w e i x i n . q q . c o m / s / j i P M U k 6 z U d O Y 6 e K x A j N D b Q . . . 2 0 2 3 0 2 2 2 C o m m e n t s k 8 s of y a m l Configuration details a p i V e r s i o n : a p p s / v 1 # Version number k i n d : D e p l o y m e n t # Resource type, P o d | D e p l o y m e n t | J o b | I n g r e s s | S e r v i c e 。 K 8 s Generally not created directly P o d ， Instead, it is managed and scheduled through controller and template configuration# We use D e p l o y m e n t Controller, . . . . . 2 0 2 3 0 2 2 1 C o m m e n t s Next page

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