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There is a problem with grade when Android studio configures the environment. The system cannot find the specified file! (language Java)

img https://img mid.csdnimg.cn/release/static/image/mid/ask/111528445256161.jpg?x oss process=image/auto orient,1/resize,w 320,m lfit Prompt: the system cannot find the specified file , But there is no Chinese in my file directory , Help me all nig...

2022-05-22 | CSDN Q & A | 391 views

Java connection database problem

com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server. How to solve this problem

2022-05-22 | CSDN Q & A | 582 views

What is Linux input method installed

apt//apt get.//yum Every time you use it, you can have problems , I'm really desperate , Is there anything you can ask , Alas, the input method won't download

2022-05-22 | CSDN Q & A | 532 views

Android studio plays audio files from the local Tomcat server

stay Android studio Want to play local tomcat Audio files in , How to use it mediaplayer.setDataSource() img https://img mid.csdnimg.cn/release/static/image/mid/ask/982100745256170.png?x oss process=image/auto orient,1/resize,w 320,m lfit In the ni...

2022-05-22 | CSDN Q & A | 409 views

Building and calling WebService service with Java springboot

One 、 Server side : 1. Add dependency : dependency groupId org.apache.cxf /groupId artifactId cxf spring boot starter jaxws /artifactId version 3.4.3 /version /dependency dependency groupId org.apache.cxf /groupId artifactId cxf rt transports http ...

2022-05-22 | zengwenhe1987 | 760 views

Java receives XML byte data and reads the text content of the modified XML file

public String receivePdfFile byte fileByte { if null == fileByte fileByte.length == 0 { return ' The parameter cannot be null '; }else { try { InputStream input = new ByteArrayInputStream fileByte ; DocumentBuilderFactory dbFactory = DocumentBuilderF...

2022-05-22 | zengwenhe1987 | 887 views

Introduction to the files generated by idea build Maven project

​ .gitignore Distributed version control system git Configuration file for , Ignore submission stay .gitingore In file , Follow the appropriate Syntax , That is, specify an ignore rule on each line . / .log 、/target/、.idea .idea Folder : Confi...

2022-05-22 | Sword song | 771 views

Idea common shortcut key system setting Java syntax record

Catalog Default shortcut 1 mac mac 2 window window 33 Common system settings 59 Automatically import and delete packages 60 FIleType Filter FIleType 63 Character encoding settings 67 Lombok Annotation processing needs to be enabled Lombo...

2022-05-22 | Sword song | 689 views

Springboot development utility - Test - load test specific properties

List of articles test 1 Load test specific properties 3 Simulation case 5 New projects 7 newly build PropertiesAndArgsTest.java PropertiesAndArgsTestjava 14 edit yml yml 41 test run 48 Simulation case ( The second form ) 53 Direct co...

2022-05-22 | Ghost Knight | 102 views

Springboot development practical chapter - Advanced Configuration - configurationapplications injection, loose binding

Configure advanced configrationProperties Inject configrationProperties Inject Case presentation Self developed components bean binding Create a new module ( Not web) Failed to transfer the external chain picture , The origin station may h...

2022-05-22 | Ghost Knight | 183 views

Springboot development practical chapter - configuration advanced - common UOM application, bean attribute validation framework, hexadecimal data conversion rules

List of articles Common UOM application 1 Summary 9 Bean Attribute verification framework Bean 17 Case simulation 19 test run 38 Summary 50 Binary data conversion rules 64 Case simulation 66 test run 104 Summary 116 Common UOM ...

2022-05-22 | Ghost Knight | 326 views

Download spring source code and build

① download spring Source code : projects/spring framework/tree/v5.2.10.RELEASE ② See what you need to download gradle edition :D: source study spring source spring framework gradle wrapper gradle wrapper.properties distributionBase=GRADLE USER HOM...

2022-05-22 | Camellia Inn | 208 views

0.1 + 0.2 is not equal to 0.3. How can wechat applet cloud development solve the problem of inaccurate JavaScript decimal calculation accuracy

Look at the picture first ,0.1+0.2 It's not equal to 0.3 https://img blog.csdnimg.cn/8cddd71364684e229ee3adf1952fa6e3.png pic center This is JavaScript A problem with language itself . Speaking of this, I have to mention the information circulated ...

2022-05-22 | Little bald monk | 839 views

[Java] collection details

At a glance https://img blog.csdnimg.cn/c5871030767b4d0aaccc6835a47fac60.png https://img blog.csdnimg.cn/27330645dd174f0cb7cf4d6a172a39e7.png https://img blog.csdnimg.cn/7def294087444d4d9b56a82c41351ecf.png / / summary : / / Connection Interface ...

2022-05-22 | W worlds | 724 views

[Java] generic

summary : stay Java5 before , Ordinary classes and methods can only use specific types : Basic data type or class type , If you write code that needs to be applied to multiple types , This kind of strict restriction will bind the code a lot . Java...

2022-05-22 | W worlds | 854 views

JavaScript Date object

javaScript Built in objects for var myDate=new Date Date Object will automatically save the current date and time as the initial value Date object and method Method name effect getFullYear from Date Object returns the year... In four digi...

2022-05-22 | zhangsan3333 | 823 views

JavaScript method to find nodes, add links to tags, and select all or none

How to find nodes https://img blog.csdnimg.cn/bbe5078bae804750951c4fa9d54fab11.png How to get elements effect document.getElementById “id” adopt id Attribute to a unique element if there are multiple elements with the same name on the page id...

2022-05-22 | zhangsan3333 | 870 views

JavaScript realizes the operation of provincial and municipal union

case analysis : 1. Create a 2D array , Save the city corresponding to each province , The first 1 Victoria's first 0 The first element is an empty array . 1. Add a change event to the drop-down list in the left Province , Get the index value sele...

2022-05-22 | zhangsan3333 | 453 views

JavaScript window Understanding of onload events

window.onload The role of window.onload Method is used to perform the operation immediately after the web page is loaded , When HTML When the document is loaded , Execute a method immediately . window.onload Usually used for Elements , After...

2022-05-22 | zhangsan3333 | 867 views

Database programming in Java: JDBC

https://img blog.csdnimg.cn/9c612636d22a49c79376aab72d0e0919.jpeg Catalog One 、JDBC What is it? ? %E4%B8%80%E3%80%81JDBC%E6%98%AF%E4%BB%80%E4%B9%88%EF%BC%9F Two 、 Use steps %E4%BA%8C%E3%80%81%E4%BD%BF%E7%94%A8%E6%AD%A5%E9%AA%A4 1. First of all,...

2022-05-22 | Dongzzzz | 515 views