php转java 系列2 Spring boo 链接数据库jdbc

php转java 系列2 Spring boo 链接数据库jdbc

JDBC 
首先创建一个新项目，在创建项目时要注意导入依赖，

 

在项目创建成功后就会看到在 pom.xml 文件中找到，但是如果在创建项目的时候没有导入，就要在pom.xml中手动的添加依赖；

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

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

<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>

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

连接数据库
在连接数据库之后，编写数据库配置文件

#访问根路径

#应用名称
spring.application.name=springboot-demo

#访问端口号
server.port=8080

#编码格式
server.tomcat.uri-encoding=utf-8

#数据库相关配置
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://111:3306/wangzhan
spring.datasource.username=111
spring.datasource.password=111
spring.datasource.max-idle=10
spring.datasource.max-wait=10000
spring.datasource.min-idle=5
spring.datasource.initial-size=5

#session生命周期

server.servlet.session.timeout=30m

package com.example.demo;
import java.util.*;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;

@Controller
@SpringBootApplication
public class DemoApplication {
    @Autowired
    private final JdbcTemplate jdbcTemplate;

    public DemoApplication(JdbcTemplate jdbcTemplate) {
        this.jdbcTemplate = jdbcTemplate;
    }
    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

    @ResponseBody
    @RequestMapping("hello1")

    public String hello1() {
        Object dddd="fwef";
        Object[] ff=new Object[]{"111","1"};
        System.out.print("输入你的姓名：");
        System.out.print("输入你的姓名1：");
        System.out.print("输入你的姓名2：");
//        String sql = "insert into t_user(username, password) values(?, ?)";
//
//        jdbcTemplate.update(sql, new Object[]{"111","1"});

        String sql = "SELECT * FROM t_user";
        List<Map<String, Object>> list = jdbcTemplate.queryForList(sql);
        for (Map<String, Object> map : list) {
            System.out.println(map);
        }
        return "1";
    }



}