SpringBoot summary and springboot Summary

SpringBoot summary and springboot Summary
Directory

1. Create a project

2.

How to create a project in Springboot Step by Step open Intellij Idea editor to create a new project

• Click Create New Project
• Select Spring Initializr on the left
• On the right, select default to create from https://start.spring.io and click Next
• On the following page, enter relevant information, such as the group name or project name, and specifyGradleProject, click Next
• On this page, add the Spring plug-in we need in the project. In general, click Next on Web/Jpa/Thymeleaf/MySQL.
• Then, enter the project name, specify the Save directory, and click Finish to initialize the Gradle project.

Configure our Springboot Parameters

• Modify the configuration of our build. gradle and refresh it.

  apply plugin: 'idea'ext['thymeleaf.version'] = '3.0.9.RELEASE'ext['thymeleaf-layout-dialect.version'] = '2.2.2'

• Modify basic parameters in application. properties

  server.port=6666spring.datasource.url=jdbc:mysql://localhost:3306/another_springboot_dbspring.datasource.username=rootspring.datasource.password=rootspring.datasource.driver-class-name=com.mysql.jdbc.Driverspring.jpa.show-sql=truespring.jpa.hibernate.ddl-auto=updatespring.thymeleaf.mode=htmlspring.thymeleaf.cache=falsespring.messages.encoding=GBK

• Enable MySQL service and create related databases in MySQL

  create database another_springboot_db

• Enable our server

  localhost:6666

Create the Book module and create entity/dao/controller

• Create model/Author. java

  @Entitypublic class Author {    @Id    @GeneratedValue    private Long id;    private String name;    private String telephone;    @OneToMany(mappedBy = "author")    private List<Book> books;    //...}

• Create model/Book. java
• Create dao/AuthorDAO. java

  public interface AuthorDAO extends JpaRepository<Author, Long> {}

• Create dao/BookDAO. java
• Create web/AuthorController. java

  @Controllerpublic class AuthorController {    @Autowired    private AuthorDAO authorDAO;    @GetMapping("/author_add")    public String add() {        return "book/add_author";    }    @PostMapping("/author_add")    public String store(Author author) {        authorDAO.save(author);        return "redirect:author_add";    }}

• Create web/BookController. java

Create the Thymeleaf template Layout for the Book Module

• First, create the resource file messages. properties under the resource Directory.

• Add the public parameters to be used in the resource file.
• Create a public layout file layout/book.html


Example of adding a function to Book

• Create two add/save methods in BookController to present the added form and process the form request respectively.

  @GetMapping("/add")public String add(Model model) {    model.addAttribute("authors", authorDAO.findAll());    return "book/add";}@PostMapping("/add")public String save(Book book, Model model) {    bookDAO.save(book);    return "redirect:index";}

• Create a form page for the newly added book and use the layout extension we have defined

  <! DOCTYPE html> Add verification for the new page
    
     
  
     
      
  First, it is recommended to use a Java verification framework for JSR-303 specifications
     
      
  Second, use the errors. reject () method for manual verification in the Controller for other simple errors.
  If (book. getAuthor () = null | book. getAuthor (). getId () <1) {errors. rejectValue ("author", null, "Enter the author's information! ");} If (errors. hasErrors () {model. addattriors (" authors ", authorDAO. findAll (); return" book/add ";}
     
      
  Then, you can: 
       
   
        
  Customize verification annotations and verification classes for the JSR Standard
   
        
  Custom Spring validator