Idea下Spring Boot、thymeleaf、Jpa項目整合實例

時間 2019-11-08

標籤 idea spring boot thymeleaf jpa 項目整合實例欄目 Eclipse 简体版

原文原文鏈接

Idea下Spring Boot、thymeleaf、Jpa項目整合實例html

1、建立項目java

JDK選擇1.8便可。mysql

選中Web下的web、Template Engines下的Thymeleaf、SQL下的JPA和MySQLweb

而後點擊Next，下一界面中，直接點擊Finishspring

2、修改Mydemo2Applicationsql

package com.example.mydemo2;

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

@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)
public class Mydemo2Application {

	public static void main(String[] args) {
		SpringApplication.run(Mydemo2Application.class, args);
	}
}

3、編寫控制器數據庫

1.在com.example.mydemo2下新建package，名爲controller瀏覽器

2.在controller新建控制器（Java類），命名爲HelloController，其代碼以下：app

package com.example.mydemo2.controller;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {
    @RequestMapping("/")
    public String hello(){
        return "Hello Spring-Boot";
    }
}

3.執行程序ide

4.打開瀏覽器，在地址欄中輸入：http://localhost:8080,出現以下頁面

代表，環境配置成功

4、配置數據庫鏈接信息

1.打開application.properties，該文件在resources下，配置內容以下：

####datasource###############
spring.datasource.url = jdbc:mysql://localhost:3306/db_student  
spring.datasource.username = root  
spring.datasource.password = 123456  
spring.datasource.driverClassName = com.mysql.jdbc.Driver  
spring.datasource.max-active=20  
spring.datasource.max-idle=8  
spring.datasource.min-idle=8  
spring.datasource.initial-size=10 
#################################

2.修改MyDemo2Application文件，作以下修改.

@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)
//將上句修改成@SpringBootApplication

5、訪問數據庫

1.在src、java下建立package，「com.example.entity"，並建立實體類"StudentInfo"代碼以下:

import javax.persistence.Table;

@Entity
@Table(name="tb_studentinfo")
public class StudentInfo {
    @Id
    private int id;
    private String name;
    private int age;
    private String address;

    public StudentInfo(){}
//此處省略了其get和set方法

2.建立數據訪問層Dao層，在 src、java下新建package，"com.example.dao"，並建立接口StudentDao，代碼以下：

package com.example.dao;

import com.example.entity.StudentInfo;
import org.springframework.data.jpa.repository.JpaRepository;

public interface StudentDao extends JpaRepository<StudentInfo,Integer>{
}

3.建立事務層接口StudentService

package com.example.mydemo2.service;

import com.example.mydemo2.entity.StudentInfo;

import java.util.List;

public interface StudentService {

    List<StudentInfo> getAllStudents();
}

3.建立事務層StudentServiceImpl類，實現StudentService接口

package com.example.mydemo2.service.impl;

import com.example.mydemo2.dao.StudentDao;
import com.example.mydemo2.entity.StudentInfo;
import com.example.mydemo2.service.StudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class StudentServiceImpl implements StudentService {

    @Autowired
    private StudentDao studentDao;
    @Override
    public List<StudentInfo> getAllStudents() {
        return studentDao.findAll();
    }
}

6、建立控制器，測試數據庫訪問

1.在controller下新建StudentController控制器，代碼以下：

package com.example.mydemo2.controller;
import com.example.mydemo2.entity.StudentInfo;
import com.example.mydemo2.service.StudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
public class StudentController {

    @Autowired
   private StudentService studentService;

    @RequestMapping("/showInfo")
    public String showInfo(){
        List<StudentInfo> stus= studentService.getAllStudents();
        String name="姓名：";
        for(StudentInfo stu:stus){
            name=name+stu.getName();
        }
        return name;
    }
}

2.打開瀏覽器，輸入localhost:8080/showInfo，結果以下

7、使用thymeleaf視圖層

1.在resources下的templates下建立文件夾（Directory）student,並在其中建立StudentsInfo.html文件,內容以下：

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>顯示全部學生信息</title>
    <style>
        table,tr,td{
            border: 1px solid #115588;
        }
    </style>
</head>
<body>
    <table>
        <thead>
            <tr>
                <td>編號</td>
                <td>姓名</td>
                <td>年齡</td>
                <td>地址</td>
            </tr>
        </thead>
        <tbody>
            <tr th:each="stu:${stus}">
                <td th:text="${stu.getId()}"></td>
                <td th:text="${stu.getName()}"></td>
                <td th:text="${stu.getAge()}"></td>
                <td th:text="${stu.getAddress()}"></td>
            </tr>
        </tbody>
    </table>
</body>
</html>

2.修改StudentController控制器以下所示

package com.example.mydemo2.controller;
import com.example.mydemo2.entity.StudentInfo;
import com.example.mydemo2.service.StudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@Controller
public class StudentController {

    @Autowired
   private StudentService studentService;

    @RequestMapping("/showInfo")
    public String showInfo(Model model){
        List<StudentInfo> stus= studentService.getAllStudents();
        model.addAttribute("stus",stus);
        return "/student/StudentsInfo";
    }
}

3.運行程序，打開瀏覽器，輸入localhost:8080/showInfo，結果以下所示