how to write microservices in java

One, prepare:1. Ensure that the computer is equipped with Eclipse software and ensure that environment variables are configured(1) Environment variable configuration method:Special note: JDK and Eclipse saved paths cannot have Chinese characters1. Open My Computer--Properties--advanced--environment variables2. New system Variable Java_homeVariable name: java_homeVariable value: The directory of the JDK, such as D:/java3. Select the environment variable named "Path" in "System variables"Double-cl

, we need to troubleshoot on the server. Use the Jmap tool that comes with the JDK to see what the specific objects are in the JAVA application, as well as the number of cases and their size. The specific commands are as follows:Jmap-histo:live ' pid of Java ' # for easy observation, or write output to file Jmap-histo:live ' pid of

Java IO stream: Random file read/write, javaio stream The Java. io package provides the RandomAccessFile class for creating and accessing random files. Using this class, you can jump to any position of the file to read and write data. The program can insert data into a random file without damaging other data of the fil

) Write one character, two bytes 1"Example 10-12"imitates the system log to write data to the end of the file. 2 //********** Ep10_12.java **********3 ImportJava.io.*;4 classep10_12{5 Public Static voidMain (String args[])throwsioexception{6 Try{7BufferedReader in=NewBufferedReader (NewInputStreamReader (system.in));8String s=in.readl

Many examples of reading and writing files in Java are confusing for beginners. I think it is necessary to perform various methods. One analysis and classification to clarify the similarities and differences between different methods. 1. in JDK 1.0, the base classes inputstream and outputstream are usually used for read/write operations.In inputstream, fileinputstream is similar to a file handle, which is

;importjava.util.linkedhashmap;importjava.util.map;import java.util.map.entry;publicclasssharedbufferReadersPackage Readwritelock;import Java.util.random;public class Reader implements Runnable{private final sharedbufferWritten byPackage Readwritelock;import Java.util.random;public class Writer implements Runnable{private final sharedbufferTest classPackage Readwritelock;public class Test {public static void main (string[] args) {System.out.println ("++++++++++++++++++ ++++++++++++++++++"); Shar

); Pw.close (); } Catch(FileNotFoundException e) {//TODO auto-generated Catch blockE.printstacktrace (); } Catch(unsupportedencodingexception e) {//TODO auto-generated Catch blockE.printstacktrace (); } } /*** PrintWriter (Writer out, Boolean autoflush) * Creates a new printwriter, flag = True indicates automatic refresh, i.e. no pw.close () will automatically refresh the content into the text Pieces *@paramWrite *@paramFlag *@paramEmployees*/ Public voidWriteData (Writer

data output stream object3) write the data of the binary file using the method of the data output stream classOut.write (1);//writes the specified byte data to the binary file4) Turn off the data output streamOut.close ();C. Write a Java program to read the Win.ini file in the Windows directory and output its contents1 ImportJava.io.DataInputStream;2 ImportJava.

{ Stmt. close (); Con. close (); } Catch (Exception e ){ E. printStackTrace (); } } } } This Template defines two methods. excute is used to execute add, modify, delete, and so on. query is used to execute queries. In these two methods, the encapsulated parameters and encapsulated results are not sure, therefore, the callback function defined above is used for implementation, and the specific implementation is handed over to the specific implementation class for implementation. (MessagePropert

ad link address, our "Baidu ad auto-click tool" must also append the ck = 645.0.125.295.105.383.115.2563 parameter to simulate the effect of clicking a hyperlink. The value after the ck parameter is not fixed, but calculated by some algorithm. Do we have to use a java program to write such an algorithm tool and method? Let's take a look at how this javascript function is written! View the javascript source

Java storage information php read/write memcache garbled. We use java to write data and then use php to read data. However, when we use php to read data, we find the memcache garbled code problem. Next, I will introduce the solution to memcache garbled code. We use java to

improve the efficiency. For example, there are five threads thread1, thread2, thread3, thread4, thread5, And the consumed CPU time is, and 7, respectively. (Assuming that the CPU rotation cycle is 4 CPU times, and threads are independent of each other) It takes 19 CPU times to execute the task in sequence, and the time required for parallel execution must be less than 19 CPU times, the specific time depends on the threads that can be executed simultaneously. In very small-scale situations, if y

Reprint Please specify source: http://blog.csdn.net/xingjiarong/article/details/47947515Before we talked about Reentrantlock, this kind of lock does not differentiate between read and write operations, and if one thread is performing a read operation, then all other threads cannot perform any read or write operations. This can guarantee the program's mutex, but reduce the concurrency of the program, so that

Randomaccessfile class/ * * Randomaccessfile class, Random Read and write files * * Data segmentation to be regular, each segment size is equal, you can set each piece of data to a larger value, enough to exist each segment of the data * */public class Test04 {public static void main (string[] args) throws IOException {//writefile ();ReadFile ();}//write data public static void WriteFile () throws IOExcepti

This article gives an example of how to read and write files in Java programming. Share to everyone for your reference, specific as follows: What is the function of file reading and writing in Java? The answer to this question should be the first to think of Java is just a language, one of our use tools, so the answe

method.Back to top recommended 46:equals should consider a null value scenarioContinuing with the 45 suggested questions, we solved the question of the reflexive nature of the overwrite equals, is it perfect? To refactor the main method:public static void main (string[] Args) {person p1= new person ("zhang san"); Person p2= the new person (null);/* no changes in other parts, no more repeating */}Very small changes, you must know that the result is the package "null pointer" Except

method.Back to top recommended 46:equals should consider a null value scenarioContinuing with the 45 suggested questions, we solved the question of the reflexive nature of the overwrite equals, is it perfect? To refactor the Main method:public static void Main (string[] args) {person p1= new person ("Zhang San"); Person p2= the new person (NULL);/* No changes in other parts, no more repeating */}Very small changes, you must know that the result is the package "null pointer" except

This article explains the process of writing a HelloWorld program in Eclipse.Students who have just learned Java may write Java source code in Notepad, and finish compiling and running the Java program at the command prompt. Such a method is really enough to learn the basics of Jav