springboot入门
java.boot
主程序
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| package cn.sdadgz.boot;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class MainApplication {
public static void main(String[] args) {
SpringApplication.run(MainApplication.class, args);
}
}
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controller
注解：
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| @RestController
@Controller
@RequestMapping("[路径]")
@ResponseBody
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config
手动添加bean
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| @Configuration
public class MyConfig(){
@Bean
public User user01(){
return new User("张三",18);
}
}
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自定义
拦截器config
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| @Configuration
public class adminWebConfig implements WebMvcConfigurer {
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(new LoginInterceptor())
.addPathPatterns("/**")
.excludePathPatterns("/","/login","/css/**","/fonts/**","/images/**","/js/**");
}
}
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矩阵变量|converter
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|
@Bean
public WebMvcConfigurer webMvcConfigurer(){
return new WebMvcConfigurer() {
@Override
public void configurePathMatch(PathMatchConfigurer configurer) {
UrlPathHelper urlPathHelper = new UrlPathHelper();
urlPathHelper.setRemoveSemicolonContent(false);
configurer.setUrlPathHelper(urlPathHelper);
}
@Override
public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
converters.add(new GuiguconventerMessage());
}
};
}
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converter 提交数据时
messageConverter 返回数据时
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| public class GuiguconventerMessage implements HttpMessageConverter<Person> {
@Override
public boolean canRead(Class<?> aClass, MediaType mediaType) {
return false;
}
@Override
public boolean canWrite(Class<?> aClass, MediaType mediaType) {
return true;
}
@Override
public List<MediaType> getSupportedMediaTypes() {
return MediaType.parseMediaTypes("application/x-guigu");
}
@Override
public Person read(Class<? extends Person> aClass, HttpInputMessage httpInputMessage) throws IOException, HttpMessageNotReadableException {
return null;
}
@Override
public void write(Person person, MediaType mediaType, HttpOutputMessage httpOutputMessage) throws IOException, HttpMessageNotWritableException {
String data = person.getName()+";"+person.getPassword()+";"+person.getAge();
OutputStream body = httpOutputMessage.getBody();
body.write(data.getBytes());
}
}
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@Configuration
- proxyBeanMethods = false // 默认true，其他组件不依赖它时用false更快
@Import({})
- {User.class,Pet.class} // 自动创建组件
@ConditionalOnBean(name = “[tom]”) // tom存在时创建组件，省略其他条件装配
@ImportResource(“classpath:beans.xml”) // 导入xml装配
@EnableConfigurationProperties(User.class) // 自动装配配置文件
pojo
注解：
@Component // 组件
@ConfigurationPeroperties(Prefix = “[mycar]”) // 配置文件自动装配
拦截器旧
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| package com.atguigu.springboot.demo2.interceptor;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class LoginInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
HttpSession session = request.getSession();
Object loginuser = session.getAttribute("loginuser");
if(loginuser != null){
return true;
}else {
session.setAttribute("msg","请先登录");
request.getRequestDispatcher("/").forward(request,response);
return false;
}
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
}
}
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文件上传
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| @Controller
public class FormTestController {
@GetMapping("/form_layouts")
public String formLayout(){
return "form/form_layouts";
}
@PostMapping("/upload")
public String uploadForm(
@RequestParam("email") String email,
@RequestParam("username") String username,
@RequestParam("headerImg")MultipartFile headerImg,
@RequestParam("photos") MultipartFile [] photos
// 自动封装
){
System.out.println("email:"+email+"username:"+username+"headering:"+headerImg.getSize()+"photos:"+photos.length);
if(!headerImg.isEmpty()){
try {
String originalFilename = headerImg.getOriginalFilename();
headerImg.transferTo(new File("D:/cache/"+originalFilename));
} catch (IOException e) {
throw new RuntimeException(e);
}
}
if (photos.length>0){
for (MultipartFile photo : photos) {
if(!photo.isEmpty()){
String originalFilename = photo.getOriginalFilename();
try {
photo.transferTo(new File("D:/cache/"+originalFilename));
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}
}
return "main";
}
}
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resources
application.properties|application.yaml
springboot配置文件 官网
开启页面表单的Rest功能
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| spring:
mvc:
hiddenmethod:
filter:
enabled: true
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开启请求参数内容协商模式
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| spring:
mvc:
contentnegotiation:
favor-parameter: true
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pom
导入JDBC
导入boot
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| <parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.7.2</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
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yaml和properties自动提示
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| <dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<optional>true</optional>
</dependency>
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maven打包jar
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<packaging>jar</packaging>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
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maven重写boot配置
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| <properties>
<mysql.version>5.1.43</mysql.version>
</properties>
<dependecies>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
</dependecies>
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springboot+mybatis
导入pom
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| <dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.4</version>
</dependency>
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配置文件properties|yaml
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mybatis:
config-location: classpath:mybatis/mybatis-config.xml
mapper-locations: classpath:mybatis/mapper/*.xml
mybatis:
mapper-locations: classpath:mybatis/mapper/*.xml
configuration:
map-underscore-to-camel-case: true
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mapper
注解
我不会，长大后再学习
原生组件注入(Servlet,Filters,Listeners)
尚硅谷65p mybatisPlus下次从这p开始看，草，这会不看了
SpringBoot2核心技术与响应式编程 · 语雀 (yuque.com)
