Refer to Sun's Java coding specification, semi-translation semi-comprehension.
Use blank lines to split blocks of code and add comments to code blocks;
A file a class (or interface) that places a private class behind a common class that references that class;
Source file composition: The declaration of a file comment, Package/import, class, or interface;
Environment Java Environment JDK1.8 installed mysql-5.6.38-winx64 idea2016 (64)The problem is this: Idea debugging Eclips project into the database and changing question marksFirst of all, Eclips and release of the project is not a problem, the first thought is the coding problem, so check the project and database code, but see that the code is UTF-8, the database is viewed through (navicat)But there are ar
before the question, let's take a look at what is Url,uri and QueryString, as shown in 1:Figure 1:url-uri-querystringURL: is the acronym for the Global Resource Locator, as above localhost: refers to domain (IP or hostname), 8080: is the port Web service is generally 80,8080 is the use of its own test, to avoid and browser port conflicts.ROOT: Is the Contentpath, which is the virtual path, if the Tomcat server object is the Servlet: Is the Servletpath message, which corresponds to the Getspecial
Java inside the built-in strings are all UTF-16 encoding, detailed coding way to see hereimport Java.nio.charset.charset;import java.util.arrays;import java.util.Map; Public classString2bytes { Public Static voidMain (string[] args) {String str="\u005bab Me"; Mapcharset.availablecharsets (); for(String charsetName:charsetMap.keySet ()) {System. out. println (CharsetName +":"+ Charsetmap.Get(CharsetName));
Java Coding Style:1. Factory method should be stateless.State normally refers to the member variables of class. Stateless, more precisely, it means immutable.Factory was just to create objects, and one call should not affect anothers, if it was mutable, then the method call Mnight The chance to the States.And then it would affect other calls which is not supposed to happen.2.Restrict the access level of any
Recently in a project, the overall project is to deal with the database, take out data to be submitted to an interface through the HTTP protocol. The specific function is not much to say, just talk about the inside of a point--coding problems
In the project, it involves taking the MD5 value of all the data.
In Java projects, individuals prefer to change the project's default encoding to UTF-8. The develop
xml| Coding | solve | Problems recently encountered a project, the need to save the declaration file in XML format, coding problems really let me a headache for a while. Now all unified into UTF-8 code. Specific operations in various languages
Here, I use the DOM for XML parsing, which should be simple.
1 customers first use VB to edit the form, generate a Apply.xml file.
In VB, use MSXML 4.0. If you don't
public key, the public key and the private key belong to the message passing parties, carries on the encrypted message passing.Consider a scenario.A machine module needs to export the data to a file, send the file to the B machine, and import the data by B.In this scenario, a is equivalent to the server, which needs to give the certificate to B, encrypt the data with the private key, generate the signature, and export to the file.b corresponds to the client, using the received digital certifica
java.sql.PreparedStatement instead of java.sql.Statement.(6) The method prefix used to set the state of the object must be set; the method prefix used to retrieve the state of a Boolean type object must be is, and the other method prefix must be get.(7) The program should use as few numbers (or characters) as possible, define static variables to illustrate the meaning of the number (or character). When you need to assign or compare in a program, use the static variables defined earlier. Excepti
In this paper, we describe the method of Base64 encoding for utf-8 of Chinese strings by JS. Share to everyone for your reference, specific as follows:
String to encode: "Select username from user"
Using Java for encoding, Java programs:
String sql = "Select User name from user";
String encodestr = new String (Base64.encode (Sql.getbytes ("UTF-8")); Coding
Java coding SpecificationThe first letter of each word in the naming conventions class must be capitalized, as shown in figureUserServiceIncorrect naming methoduserService、userserviceTest caseTestEnd, suchUserServiceTestIf it starts with the abbreviation, the abbreviation should all be in uppercase, as shown in figureHTMLEditorIncorrect syntax · the class name should contain English letters or numbers, and
directly allocated NIO buffer to read sensitive data from a file. After the data has been used. It can be cleared immediately, and sensitive data is not slow to exist in multiple locations, only in system memory.void ReadData () {Bytebuffer BB = bytebuffer.allocatedirect (16*1024); try (filechannel rdr = (new FileInputStream ("file")) . Getchannel ()) {while (Rdr.read (BB) > 0) {//does something with the Bufferbb.clear ();}} catch (Throwable e) {//Handle err or}}It is important to note that the
), which uses other encryption modes other than the ECB, needs to pass in an initial vector, which is equal to the block size and the AES block size is 128bit, so the length of the IV is 16 bytes and the initial vector can enhance the algorithm strength.
Encryption Mode (Cipher mode) has CBC, ECB, CTR, ofb, CFB five species.
The Padding method (Padding) determines the content that the last block needs to be populated, filled with pkcs5padding, pkcs7padding, nopadding three, but the JDK only prov
same problems as I do then look down, if not that may not help you in the following content.
First, check the text encoding of the current database.SHOW VARIABLES like ' character_set_% '
I am using the MySQL database, the code is as follows:
The workaround is simple to add a sentence after the database connection statement? USEUNICODE=TRUECHARACTERENCODING=GBK on the line.String url = "Jdbc:mysql://localhost:3306/db_databaseuseunicode=truecharacterencoding=gbk";String user = "root"
subscript of each node of the Huffcode array is filled by the back forward and the prefix of the encoding is guaranteed to be the same as XX ... huffcode[0][6]=1 huffcode[0][5]=0Then Huffcode is 0000 0001 that is small Mark 1 of a Huffman node Huffman slowedFor (Huffmannode c=hn[j],p=c.getparent ();p!=null;c=p,p=p.getparent ()) {if (P.getlchild (). Equals (c)) huffcode[j][start--]=0;else huffcode[j][start--]=1;}//a path to the same node.huffcode[j][start--]=-1;//to the remaining path is padding
meaning of the Description field */Special NOTES:TodoA place that has not been completed but must be completedFixmeWhere the bug must be modifiedIf a method is an implementation of an interface, then the detailed method document comment should be written in the method of the interface class, and the implementing class method should guide the past through the @see.Code optimization:1. Avoiding the "God class"2. Try to separate some logic implementations, especially reusable ones, into different
1, the class name uses the Hump name method, the first letter capitalization.2, the class variable uses the Hump name method, the first letter lowercase.3, the method name is a verb phrase, the first letter lowercase, as far as possible to describe the intent of this method.4, note in the fine not many, a good note to try to describe the code to express the meaning.5, a function of the different operations of the Code section separated by a blank line, convenient for later maintenance.6, the var
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