SpringBoot01——Framework Introduced and Helloworld

1 Introduction

SpringBoot main solution is to simplify the configuration in the micro-architecture services (fast configuration), separating the front and rear end, rapid development

advantage:

l provides a quick start entry
l-box, providing a default configuration
l embedded container of web projects
l no redundancy code generation and xml configuration requirements

2. Run D EMO

Creating SpringBoot several ways the project:

l official website Initializr
l use the Eclipse , STS , Idea and other IDE to create Maven project and the introduction of dependence
l use STS plug the Spring Initializr create project

Access http://start.spring.io/ into the Spring project Initializr

Generate download demo.zip

Import project

1.Import a Maven project

2. Select the file you want to import

3. Project skeleton

Startup project

l direct run to start the program in the Main () method

l installed STS plug-in or using STS can right click on the project RunAS -> the Spring the Boot APP

Run successfully message:

If you run error, please refer to the FAQ.

personalise

Modify the startup banner

In the new resources under the directory banner.txt

http://www.network-science.de/ascii/ English

https://www.degraeve.com/img2txt.php Pictures

${AnsiColor.BRIGHT_CYAN}
 _      _  _    _    _       ______                   
| |    (_)| |  | |  | |      | ___ \                  
| |     _ | |_ | |_ | |  ___ | |_/ /__ _   __ _   ___ 
| |    | || __|| __|| | / _ \|  __// _` | / _` | / _ \
| |____| || |_ | |_ | ||  __/| |  | (_| || (_| ||  __/
\_____/|_| \__| \__||_| \___|\_|   \__,_| \__, | \___|
                                           __/ |      
                                          |___/     
${AnsiColor.BRIGHT_RED}
Logo Designer: LittlePage
Spring Boot Version: ${spring-boot.version}${spring-boot.formatted-version}

Eclipse的皮肤

菜单栏中

Help -> EclipseMarketplace

搜索Theme

傻瓜式安装这个，安装完成会提示重启，跟随指引选择喜欢的风格。

简单使用

application.properties

把所有的配置全放在这个文件里，方便统一管理，maven也可以做到

修改tomcat端口

server.port=90

修改项目路径

server.servlet.context-path=/demo

多个入口main方法，打包之后找不到入库类

<build>
   <plugins>
      <plugin>  
          <groupId>org.springframework.boot</groupId>  
          <artifactId>spring-boot-maven-plugin</artifactId>  
                <configuration>  
                    <mainClass>com.yxxy.MyApp</mainClass>  
                </configuration>  
            </plugin>  
        </plugins>
</build>

HelloWorld

RestController

RestController = @Controller+@ResponseBody

一个效果

@RestController

 

public class MyAppController {

 

@RequestMapping("/")

public Map<String, String>  index() {

Map<String, String> map = new HashMap<>();

 

map.put("aaa", "bbb");

map.put("aaa", "bbb");

map.put("aaa", "bbb");

map.put("aaa", "bbb");

return map;

}

使用thymeleaf模板引擎

Pom.xml引用

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-thymeleaf</artifactId>

</dependency>

Controller代码

@Controller

public class IndexController {

 

@RequestMapping("/")

public String index(ModelMap map) {

 

// 加入一个属性，用来在模板中读取

map.addAttribute("msg", "nihao~");

return模板文件的名称，对应src/main/resources/templates/index.html

 

return "index";

}

模板文件代码
<h1 th:text="${msg}">hi!</h1>

稍微复杂的restful api应用

UserRestfulController
@RequestMapping("/")

@RestController

public class UserRestfulController {

 

static Map<Long, User> users = Collections.synchronizedMap(new HashMap<Long,User>());

@RequestMapping(value="/User",method=RequestMethod.GET)

public List<User> getUserList(){

ArrayList<User> list = new ArrayList<>(users.values());

return  list;

 

}

 

@RequestMapping(value="User",method=RequestMethod.POST)

public String addUser(@ModelAttribute User user) {

users.put(user.getId(), user);

return "addUser Success";

 

}

}

User
public class User {

 

private Long id;

private String loginName;

private String password;

private String nickName;

注入Service
UserRestfulController
 

@Autowired

private UserService userSrv;

 

 

@RequestMapping(value="/User",method=RequestMethod.GET)

public List<User> getUserList(){

 

return  userSrv.getUserList();

}

 

@RequestMapping(value="User",method=RequestMethod.POST)

public String addUser(@ModelAttribute User user) {

String msg = userSrv.addUser(user);

return msg;

 

}

UserService
@Service

public class UserService {

static Map<Long, User> users = Collections.synchronizedMap(new HashMap<Long,User>());

 

public List<User> getUserList() {

ArrayList<User> list = new ArrayList<>(users.values());

return list;

}

 

public String addUser(User user) {

users.put(user.getId(), user);

return "addUser Success";

}

}

前端模板显示

 <h1>User list</h1>

 

  <table>

    <tr>

      <th>NAME</th>

      <th>loginName</th>

      <th>nickName</th>

    </tr>

    <tr th:each="user : ${list}">

      <td th:text="${user.id}">id</td>

      <td th:text="${user.loginName}">loginName</td>

      <td th:text="${user.nickName}">nickName</td>

    </tr>

  </table>

 

  <p>

    <a href="../home.html" th:href="@{/}">Return to home</a>

  </p>

常见问题

Pom.xml

Springboot项目必须要继承的parnet

Pom.xml第一行报错

进入本地库

for /r %i in (*.lastUpdated) do del %i   

然后update

缺少或包错误

删掉重新update

找不到主类

所有错误都解决后

Jar方式运行首先得有这个jar包

先clean package 生成jar文件，然后再run main方法

找不到jdk

把jre的路径换成jdk的