SpringBoot
案例一
1、导入依赖
</properties>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.1.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<!-- spring-boot-starter-web是为我们提供了包括mvc,aop等需要的一些jar -->
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<!-- 因为我们已经配置了 parent 中的version 所以这里不需要指定version了 -->
</dependency>
2、创建FirstController类
@RestController public class FirstController { @RequestMapping("/firstController") public String firstController(){ System.out.println("第一个请求"); return "Hello SpringBoot"; } }
3创建StartSpringBoot 测试类
@SpringBootApplication public class StartSpringBoot { public static void main(String[] args) { SpringApplication.run(StartSpringBoot.class,args); } }
控制台输出
. ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v1.4.1.RELEASE) 2019-12-10 16:19:28.638 INFO 12836 --- [ main] com.wdksft.StartSpringBoot : Starting StartSpringBoot on LAPTOP-98IAV276 with PID 12836 (E:\San\SpringBoot\springboot(1)\springboot\target\classes started by s in E:\San\SpringBoot\springboot(1)\springboot) 2019-12-10 16:19:28.647 INFO 12836 --- [ main] com.wdksft.StartSpringBoot : No active profile set, falling back to default profiles: default 2019-12-10 16:19:28.904 INFO 12836 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@1c1bced: startup date [Tue Dec 10 16:19:28 CST 2019]; root of context hierarchy 2019-12-10 16:19:32.255 INFO 12836 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http) 2019-12-10 16:19:32.278 INFO 12836 --- [ main] o.apache.catalina.core.StandardService : Starting service Tomcat 2019-12-10 16:19:32.280 INFO 12836 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.5 2019-12-10 16:19:32.574 INFO 12836 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext 2019-12-10 16:19:32.574 INFO 12836 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 3683 ms 2019-12-10 16:19:33.083 INFO 12836 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/] 2019-12-10 16:19:33.095 INFO 12836 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*] 2019-12-10 16:19:33.096 INFO 12836 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*] 2019-12-10 16:19:33.097 INFO 12836 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*] 2019-12-10 16:19:33.098 INFO 12836 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*] 2019-12-10 16:19:33.992 INFO 12836 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@1c1bced: startup date [Tue Dec 10 16:19:28 CST 2019]; root of context hierarchy 2019-12-10 16:19:34.159 INFO 12836 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/firstController]}" onto public java.lang.String com.wdksft.cotroller.FirstController.firstController() 2019-12-10 16:19:34.171 INFO 12836 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest) 2019-12-10 16:19:34.172 INFO 12836 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse) 2019-12-10 16:19:34.250 INFO 12836 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler] 2019-12-10 16:19:34.250 INFO 12836 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler] 2019-12-10 16:19:34.300 INFO 12836 --- [ main] .m.m.a.ExceptionHandlerExceptionResolver : Detected @ExceptionHandler methods in exceptionHan 2019-12-10 16:19:34.372 INFO 12836 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler] 2019-12-10 16:19:34.794 INFO 12836 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup 2019-12-10 16:19:34.990 INFO 12836 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http) 2019-12-10 16:19:35.002 INFO 12836 --- [ main] com.wdksft.StartSpringBoot : Started StartSpringBoot in 7.743 seconds (JVM running for 11.854)
网页访问
二、SpringBoot静态资源访问
1、在resources文件下创建static包，再static下创建img包
三、SpringBoot解决异常问题
1、在Controller类中定义一个异常
@RestController public class FirstController { @RequestMapping("/firstController") public String firstController(){ int result=5/0; System.out.println("第一个请求"); return "Hello SpringBoot"; } }
2. 定义异常类
@ControllerAdvice public class ExceptionHan { @org.springframework.web.bind.annotation.ExceptionHandler(RuntimeException.class) @ResponseBody public Map<String,Object> exceHandler(){ Map<String,Object> map=new HashMap<>(); map.put("error","500"); map.put("msg","异常"); return map; }
3、结果如下
四、SpringBoot使用freemarker
1、导入依赖freemarker
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-freemarker</artifactId>
</dependency>
2、配置application.propertiesleuk文件
## Freemarker 配置 spring.freemarker.template-loader-path=classpath:/templates/ spring.freemarker.cache=false spring.freemarker.charset=UTF-8 spring.freemarker.check-template-location=true spring.freemarker.content-type=text/html spring.freemarker.expose-request-attributes=false spring.freemarker.expose-session-attributes=false spring.freemarker.request-context-attribute=request spring.freemarker.prefix=/ spring.freemarker.suffix=.ftl
3、在resources包下创建templates包并创建holle.ftl模板
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>SpringBoot整合FreeMarker</title>
</head>
<body>
欢迎：
` ${name}
<#list stulist as stu>
${stu.stu_name}
</#list>
<#if 1==1>
等等等等！！！
</#if>
<#list userList as user>
${user}
</#list>
</body>
</html>
4、创建StartSpringBoot启动类
package com.freemarker;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class StartSpringBoot {
public static void main(String[] args){
SpringApplication.run(StartSpringBoot.class,args);
}
}
5、创建Controller类freemarkerController类
package com.freemarker.Controller;
import com.freemarker.entity.student;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import java.util.ArrayList;
import java.util.List;
@Controller
@RequestMapping("/free")
public class freemarkerController {
@RequestMapping("/freeFirst")
public String freeFirst(ModelMap map){
map.put("name","张三");
return "hello"; //找templates/name.ftl
}
@RequestMapping("/freeSecond")
public String freeSecond(ModelMap map){
List<String> list=new ArrayList<>();
list.add("张三");
list.add("李四");
list.add("王五");
map.put("userList",list);
return "hello";
}
@RequestMapping("/freeThread")
public String freeThread(ModelMap map){
List<student> list=new ArrayList<>();
student stu=new student();
stu.setStu_id(1);
stu.setStu_name("小王");
list.add(stu);
map.put("stulist",list);
return "hello";
}
}
6、页面访问实现效果如下
