1 、 Aliyun Java Initializr
In daily development work and demowhen learning to run by yourself , it is often necessary to quickly build a springbootbasic project. In addition to using IDEAbuild tools, more is used Spring Initializrto generate, but with the discovery of a long time, it will only help us to introduce only the necessary jarpackages, or other plug-ins wheels have their own configuration. All the functions 
Aliyun Java Initializrcovered Spring Initializrare added with many practical functions. It can integrate almost all current mainstream technologies, and it can be automatically integrated as long as the corresponding modules are checked.
It's not just a simple introduction of the jar package, but to help you generate the project directory, related configuration files and basic java code , saving a lot of time in setting up the environment.
Address: https://start.aliyun.com/bootstrap.html
2、magicalcoder
magicalcoderIt is a tool for automatically generating code, JAVA code is automatically generated, and H5 style layout device.
For writing a page needs back-end development is a artifact, you can drag and drop directly control layout generation css, and jssupport element, layui, bootstrap4these common front-end framework. 
Address: http://bbs.magicalcoder.com/
3. Novice tools
This is a very powerful tool site. Personally, I often use JSONformat chemicals and pythononline tools. Although I do Javait, I usually write some pythonscripts. It is very convenient to run online anytime and anywhere.
Address: http://c.runoob.com/
4 、 BEJSON
BEJSONMany useful gadgets are provided on the site. For example, I’m currently developing a configuration platform for scheduling tasks. It is inevitable to write Cronexpressions, but those who have worked on timed tasks know that Cronexpressions are not easy to memorize, and the frequency of use is relatively low, and too much time is spent on rote memorization. It's not worth it. This online tool provides a graphical interface, as long as we enter the period that we want to execute regularly, the Cronexpression can be automatically generated .
Address: https://www.bejson.com/othertools/cron
5. Online regular expressions
The writing of regular expressions is complicated and troublesome, and usually requires a lot of testing and verification before it can be adopted. This online tool provides almost all common regular verification rules.
Address: http://tool.chinaz.com/tools/regexgenerate
6. Online tools
This is also an online tool site, but its functions are relatively complicated
Address: https://tool.lu/
7, text and pictures
From time to time in the work, there will be operators or bosses who will directly give me a task, and give me statistics on the sales indicators of XX. SQLIt is very simple to query, but it is more intuitive to show this type of data to laymen. Anyway, it is all work. Why don't you finish it a little bit more brilliantly .
The text image can excelautomatically generate corresponding statistical graphics based on the data in it, and the style can be switched freely to generate PDF, JPG and other formats.
Address: https://www.wentu.io/
8. Online comparison
DiffcheckerIt is a very good code difference comparison tool, so people who have been svnor gitare diffchecknot unfamiliar with it, and he supports more types of comparisons, excel and pdf support.
Address: https://www.diffchecker.com/
9, nginx online formatting
Always modify the nginxconfiguration, this can cure your obsessive-compulsive disorder
Address: http://www.html580.com/tool/nginx/index.php
10. Generate code pictures online
The code generates pictures. This little friend who doesn’t write a blog may not often use it. For example, I often share some technical articles. It is inevitable that code blocks will be posted inside, which will be converted into pictures for viewing convenience and beautiful styles.
Address: https://www.dute.org/code-snapshot
to sum up
The above are a few online tools that I often use. In fact, they are far more than these. Although it is not a magical tool, it really improves my work efficiency. I hope it can help you a little bit.