Spring Boot起步以及集成themaleaf

1、创建项目

2、选择Maven项目

Maven配置文件

打开项目

查看项目结构

添加依赖pom.xml

<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.imooc</groupId>
  <artifactId>miaosha_1</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>miaosha_1</name>
  <url>http://maven.apache.org</url>

  <!-- 1、spring-boot-starter-parent依赖 -->
  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.9.RELEASE</version>
</parent>


  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <dependencies>
    <!-- 2、添加Spring web依赖 -->
  <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <!-- 3、添加thymeleaf依赖 -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-thymeleaf</artifactId>
  </dependency>

  </dependencies>
</project>

错误通用编码

public class CodeMsg {
  
  private int code;
  private String msg;
  
  //通用的错误码
  public static CodeMsg SUCCESS = new CodeMsg(0, "success");
  public static CodeMsg SERVER_ERROR = new CodeMsg(500100, "服务端异常");
  public static CodeMsg BIND_ERROR = new CodeMsg(500101, "参数校验异常：%s");
  //登录模块 5002XX
  public static CodeMsg SESSION_ERROR = new CodeMsg(500210, "Session不存在或者已经失效");
  public static CodeMsg PASSWORD_EMPTY = new CodeMsg(500211, "登录密码不能为空");
  public static CodeMsg MOBILE_EMPTY = new CodeMsg(500212, "手机号不能为空");
  public static CodeMsg MOBILE_ERROR = new CodeMsg(500213, "手机号格式错误");
  public static CodeMsg MOBILE_NOT_EXIST = new CodeMsg(500214, "手机号不存在");
  public static CodeMsg PASSWORD_ERROR = new CodeMsg(500215, "密码错误");
  
  //商品模块 5003XX
  
  //订单模块 5004XX
  
  //秒杀模块 5005XX
  
  private CodeMsg( ) {
  }
      
  private CodeMsg( int code,String msg ) {
    this.code = code;
    this.msg = msg;
  }
  
  public int getCode() {
    return code;
  }
  public void setCode(int code) {
    this.code = code;
  }
  public String getMsg() {
    return msg;
  }
  public void setMsg(String msg) {
    this.msg = msg;
  }
  
  public CodeMsg fillArgs(Object... args) {
    int code = this.code;
    String message = String.format(this.msg, args);
    return new CodeMsg(code, message);
  }

  @Override
  public String toString() {
    return "CodeMsg [code=" + code + ", msg=" + msg + "]";
  }
  
  
}

泛型

public class Result<T> {
  
  private int code;
  private String msg;
  private T data;
  
  /**
   *  成功时候的调用
   * */
  public static  <T> Result<T> success(T data){
    return new Result<T>(data);
  }
  
  /**
   *  失败时候的调用
   * */
  public static  <T> Result<T> error(CodeMsg codeMsg){
    return new Result<T>(codeMsg);
  }
  
  private Result(T data) {
    this.data = data;
  }
  
  private Result(int code, String msg) {
    this.code = code;
    this.msg = msg;
  }
  
  private Result(CodeMsg codeMsg) {
    if(codeMsg != null) {
      this.code = codeMsg.getCode();
      this.msg = codeMsg.getMsg();
    }
  }
  
  
  public int getCode() {
    return code;
  }
  public void setCode(int code) {
    this.code = code;
  }
  public String getMsg() {
    return msg;
  }
  public void setMsg(String msg) {
    this.msg = msg;
  }
  public T getData() {
    return data;
  }
  public void setData(T data) {
    this.data = data;
  }
}

编写启动类

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class MainApplication {

    public static void main(String[] args) throws Exception {
        SpringApplication.run(MainApplication.class, args);
    }
}

SampleController

@Controller
@RequestMapping("/demo")
public class SampleController {

    /**
     * 使用Model往模板里面传递参数
     * @param model
     * @return
     */
    @RequestMapping("/hello/themaleaf")
    public String themaleaf(Model model) {
        model.addAttribute("name", "Joshua");
        return "hello";
    }

}

编写themaleaf配置

application.properties

#thymeleaf
# 前缀
spring.thymeleaf.prefix=classpath:/templates/
# 后缀
spring.thymeleaf.suffix=.html

创建themaleaf模板

hello.html

<!DOCTYPE HTML>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <title>hello</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>
<body>
<p th:text="'hello:'+${name}" ></p>
</body>
</html>

将resources添加到源码目录

鼠标右击resources->Mark Directory as ->Sources Root

右击MainApplication ->Run 'MainApplication'

访问:localhost:8080/demo/thymeleaf

备注：IDEA导入项目

选中项目