Spring Boot 之 HelloWorld详解
SpringBoot介绍~<暂时假装有>
配置
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.nowcoder</groupId>
<artifactId>wenda</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>wenda</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.3.6.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Controller层
简单Hello输出
@Controller
public class IndexController {
@RequestMapping(path = {"/","/index"})
@ResponseBody
public String index(){
return "Hello";
}
}
访问：
http://127.0.0.1:8080/index
http://127.0.0.1:8080/
输出：
Hello
参数解析输出
路径传递
@Controller
public class IndexController {
@RequestMapping(path = {"/","/index"})
@ResponseBody
public String index(){
return "Hello";
}
@RequestMapping(path = {"/profile/{userId}"})
@ResponseBody
public String profile(@PathVariable("userId") int userId ){
return String.format("Profile Page of %d",userId);
}
}
访问http://127.0.0.1:8080/profile/2 ：
Profile Page of 2
参数解析输出例2
@RequestMapping(path = {"/profile/{groupId}/{userId}"})
@ResponseBody
public String profile(@PathVariable("userId") int userId ,
@PathVariable("groupId") String groupId ){
return String.format("Profile Page of %s / %d",groupId,userId);
}
访问http://127.0.0.1:8080/profile/admin/10086
Profile Page of admin / 10086
eg3请求参数传递
@RequestMapping(path = {"/profile/{groupId}/{userId}"})
@ResponseBody
public String profile(@PathVariable("userId") int userId ,
@PathVariable("groupId") String groupId ,
@RequestParam("type") int type ,
@RequestParam("key") String key ){
return String.format("Profile Page of %s / %d , t:%d k:%s",groupId,userId,type,key);
}
访问http://127.0.0.1:8080/profile/admin/10086?type=2&key=w
Profile Page of admin / 10086 , t:2 k:w
模板Velocity使用
controller
@RequestMapping(path = {"/vm"},method = {RequestMethod.GET})
public String template(Model model){
model.addAttribute("value1","vvvv1");
return "home";
}
指向home.html 渲染
<html>
<body>
<pre>
#*
你看不到我~~~~
*#
$!{value1}
$!{value2} ## 如果不存在，强制为空
${value3}
</pre>
</body>
</html>
依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-velocity</artifactId>
</dependency>
application.properties 配置
spring.velocity.suffix=.html
访问http://127.0.0.1:8080/vm
vvvv1
${value3}
总结
- @Controller 注释来定义说这是一个网页入口
- @RequestMapping 指定访问地址or传入参数
- 用@PathVariable和@RequestParam对传入参数做解析
- 用@ResponseBody or 模板文件 返回结果
Learn ,Practice ,Summary !
