Spring环境配置+helloworld运行 保姆级教程

废话不多说，直接上步骤

目录

1）file->new->project​

2）配置pop.xml

 3）在 com.example.demo3下创建一个名为config的包，包里建一个DruidConfig的Java类

 4）在resources中新建一个application.yaml的file

 5)进行连接：成功！

---

1）file->new->project

需要改动的仅此两处：

勾选一个

勾选三个

2）配置pop.xml

将下面的代码粘到pop里面

<repositories>
        <repository>
            <id>nexus-aliyun</id>
            <name>Nexus aliyun</name>
            <layout>default</layout>
            <url>http://maven.aliyun.com/nexus/content/groups/public</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
            <releases>
                <enabled>true</enabled>
            </releases>
        </repository>
    </repositories>

注意要将下面两个依赖粘到dependencies里面 

<dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.17</version>
    </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.8</version>
        </dependency>

 3）在 com.example.demo3下创建一个名为config的包，包里建一个DruidConfig的Java类

把下面代码粘到DruidConfig里（全部替换）

package com.example.demo3.config;

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.sql.DataSource;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

@Configuration
public class DruidConfig {

    @ConfigurationProperties(prefix = "spring.datasource")
    @Bean
    public DataSource druid(){
        return  new DruidDataSource();
    }

    //配置Druid的监控
    //1、配置一个管理后台的Servlet
    @Bean
    public ServletRegistrationBean statViewServlet(){
        ServletRegistrationBean bean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");
        Map<String,String> initParams = new HashMap<>();

        initParams.put("loginUsername","admin");
        initParams.put("loginPassword","123456");
        initParams.put("allow","");//默认就是允许所有访问
        initParams.put("deny","192.168.15.21");

        bean.setInitParameters(initParams);
        return bean;
    }


    //2、配置一个web监控的filter
    @Bean
    public FilterRegistrationBean webStatFilter(){
        FilterRegistrationBean bean = new FilterRegistrationBean();
        bean.setFilter(new WebStatFilter());

        Map<String,String> initParams = new HashMap<>();
        initParams.put("exclusions","*.js,*.css,/druid/*");

        bean.setInitParameters(initParams);

        bean.setUrlPatterns(Arrays.asList("/*"));

        return  bean;
    }
}

 4）在resources中新建一个application.yaml的file

将下面代码粘进去：

spring:
  datasource:
    #   数据源基本配置
    username: root
    #password替换成自己的
    password: cyj
    driver-class-name: com.mysql.cj.jdbc.Driver
    #第三部分换成自己的数据库student
    url: jdbc:mysql://127.0.0.1:3306/student?useUnicode=true&characterEncoding=utf-8&userSSL=false&serverTimezone=GMT%2B8
    type: com.alibaba.druid.pool.DruidDataSource
    #   数据源其他配置
    initialSize: 5
    minIdle: 5
    maxActive: 20
    maxWait: 60000
    timeBetweenEvictionRunsMillis: 60000
    minEvictableIdleTimeMillis: 300000
    validationQuery: SELECT 1 FROM DUAL
    testWhileIdle: true
    testOnBorrow: false
    testOnReturn: false
    poolPreparedStatements: true
    #   配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
    filters: stat,wall,log4j
    maxPoolPreparedStatementPerConnectionSize: 20
    useGlobalDataSourceStat: true
    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500

下面开始进行helloworld部分：

同样地，在与上面的包同一级建一个controller包，里面加一个HelloController类：

package com.example.demo3.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller
public class HelloController {
    @ResponseBody
    @RequestMapping("/hello")
    public String hello(){
        return "HelloWorld";
    }
    
}

5)进行连接：成功！