1. Create a project SpringBoot
- The first way: create a page in the official Web SpringBoot (address: https://start.spring.io ) interface is as follows:
Fill project, language, version SpringBoot, the project meta-information (group, Artifact), then enter the Dependencies in the "web", click on the search results "SpringBoot" plus sign in the back above the interface, and click the Generate-Ctrl downloads project files.
- The second way: to create the command line (refer to Ma Ying-jeou of the book "SpringBoot programming ideas")
File using the Maven Archetype plug-in, first need to create a project folder, open a command line window, the command is as follows:
mvn archetype:generate -DgroupId=thinking-in-spring-boot -DartifactId=first-spring-boot-application -Dversion=1.0.0-SNAPSHOT -DinteractiveMode=false -Dpackage=thinking.in.spring.boot
Command interpreter:
archetype: generate goal plugin
groupId:your groupId
artifactId:your artifactId
version:your version
package:your package
interactiveMode When the parameter is false to build a non-interactive, which is often said that "silently"
Results are as follows:
Of course, this should have a maven based on your local installation.
2, the project into the compiler
This is not simple, this is not a write.
3, edit POM.xml file, the introduction of the package needed for the project
There is also a trick, is to learn from Ma Ying-jeou came. Hold down the CTRL key is left click
spring-boot-starter-parent version number, as shown below:
进入spring-boot-starter-parent-2.2.1.RELEASE.pom，然后继续点击版本号，如下图所示
然后里面就可以看到各种依赖的包，例如mysql，CRTL+f 搜索你需要添加的依赖，可以知道支持的版本号。
这里需要注意下，如果引入的依赖版本之间有冲突，会报错。
4、配置访问路径和项目根路径
这里也有两种方式，具体如下：
- 配置文件方式
在application.properties配置文件中加入配置
spring.mvc.view.prefix=/WEB-INF/views/
spring.mvc.view.suffix=.jsp
- 代码编程方式
启动类加入如下代码：
@Bean
public InternalResourceViewResolver setupViewResolver() {
InternalResourceViewResolver resolver = new InternalResourceViewResolver();
*//** 设置视图路径的前缀 *//*
resolver.setPrefix("/WEB-INF/views/");
*//** 设置视图路径的后缀 *//*
resolver.setSuffix(".jsp");
return resolver;
}
这里面有一个问题，就是如果将resolver.setSuffix属性为.html,访问不到页面。如果要使用html要采用别的配置方式。
配置项目根路径：
在application.properties配置文件中加入配置
server.servlet.context-path=/你的根路径
5、编辑crontroller
编辑controller，将访问根目录的reuest跳转到具体的页面，代码如下：
@Controller
@RequestMapping("/")
public class IndexPageController {
@RequestMapping("/")
public String index(){
return "login";
}
}
这里有一个问题需要注意下，就是controller的映射地址应该在@RequestMapping里面配置，而不应该加在@Controller里面，我就是因为把映射地址写在@Controller里面报错了，错误如下：
6、编辑登录界面
登录页面的位置看你的访问路径设置，如果是/WEB-INF/views/就在/WEB-INF/views/文件夹下面窗机看login.jsp,我的路径src\main\webapp\WEB-INF\views\login.jsp
7、启动类添加@SpringBootApplication注解
@SpringBootApplication注解有如下三个元注解
@Configuration
allow to register extra beans in the context or import additional configuration
classes
允许在上下文中注册额外的bean或导入额外的配置类
@ComponentScan
enable @Component scan on the package where the application is located (see the
best practices)
The guide in the package where the scanned object class
@EnableAutoConfiguration
Enable automatic configuration mechanism of Spring Boot
8 to start the project, access the login screen
In the startup class blank right click and select Run, so that the project started for a while, open your browser and enter the access path http: // localhost: 8080 / You root path configuration
tomcat default port 8080 to publish a project, but can also be configured in port projects in application.properties.
9, several problems encountered
- mysql driven obsolescence
When the project started being given the Registered driver with driverClassName = com.mysql.jdbc.Driver was not found, trying direct instantiation.
This is because the latest driver mysql has become com.mysql.cj.jdbc.Driver. Only need to modify mysql in the driver configuration can be application.properties
#spring.datasource.driver-class-name = com.mysql.jdbc.Driver
spring.datasource.driver-class-name = com.mysql.cj.jdbc.Driver
- Include the configuration of official documents springboot project
https://spring.io/guides/gs/centralized-configuration/