spring boot(二)

spring boot中使用jsp:

1.添加tomcat依赖和jsp支持

<dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-tomcat</artifactId>
    </dependency>
    <dependency>
      <groupId>org.apache.tomcat.embed</groupId>
      <artifactId>tomcat-embed-jasper</artifactId>
    </dependency>

2.在application.yml中设置前缀和后缀　　

spring:
  mvc:
    view:
      prefix: /jsp/
      suffix: .jsp

3.在建一个jsp页面

<%--
  Created by IntelliJ IDEA.
  User: wish
  Date: 2019/12/12
  Time: 9:24
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<h4>
    欢迎光临,${name}
</h4>
</body>
</html>

4.建立controller进行页面跳页面　　

package com.webboot.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
@RequestMapping("/PageJump")
public class PageJump {


    @RequestMapping("/getIndex")
    public  String getIndex(ModelMap modelMap){

        modelMap.put("name","王五");
        return "index";
    }
}

spring boot中使用thymeleaf　

1.导入thymeleaf的依赖

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>

2.在application.yml中设置thymeleaf关闭缓存

spring:
  thymeleaf:
    cache: false

3.建立html页面　　

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    </meta>
</head>
<body>
<ul th:each="stu:${list}">
    <li><span th:text="${stu.stuId}"></span><span th:text="${stu.stuName}"></span></li>
</ul>
</body>
</html>

4.通过controller进行页面跳转

package com.boot.controller;

import com.boot.entity.Student;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.ArrayList;
import java.util.List;

@Controller
public class StuController {

    @RequestMapping("/getHtml")
    public  String getHtml(Model model){
        Student student1 =new Student("李1",1);
        Student student2 =new Student("李2",2);
        Student student3 =new Student("李3",3);

        List<Student> list = new ArrayList<>();
        list.add(student1);
        list.add(student2);
        list.add(student3);

        model.addAttribute("list",list);
        System.out.println("123456");
        return "show";
    }


}

spring boot中使用jpa

1.导入jpa依赖

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>

2.在application.yml中配置数据库连接参数

##数据库四大连接参数
spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/invoicingsystem?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
    username: root
    password: 123456

3.dao层中的接口继承CrudRepository<object, object>

package com.boot.dao;

import com.boot.entity.Users;

import org.springframework.data.repository.CrudRepository;

/**
 * 创建一个IUserDao继承CrudRepository
 */

public interface IUserDao extends CrudRepository<Users, Integer> {



}