springBoot配置

概述

　　虽然说springBoot讲究“约定大于配置”，但有时或多或少也需要一些额外的配置项，比如说数据库配置，队列配置，缓存配置等等。springBoot的全局配置文件为application.properties

自定义配置

application.properties，一些常量配置也可以写在这里

date.year = 2019
date.month = 7
date.day = 29
date.hour = 10
date.minute = 29

通过注解 “@Value(${config.name})”绑定到你想要的属性上面去

package com.xmlxy.firstspringbootproject;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
/*测试类 2019-7-29*/
@RestController
public class DemoController
{
    @Value("${date.year}")
    String year;

    @Value("${date.month}")
    String mouth;

    @Value("${date.day}")
    String day;

    @Value("${date.hour}")
    String hour;

    @Value("${date.minute}")
    String minute;

    @RequestMapping(value = "/demo",method = RequestMethod.GET)
    public String demo()
    {
        return "Hello SpringBoot";
    }
    @RequestMapping(value = "/demo1",method = RequestMethod.GET)
    public String demo1()
    {
        return year + "." + mouth + "." + day + "  " + hour + ":" + minute;
    }
}

通过 127.0.0.1:8080/demo1 访问，可以看到我们配置中的值被绑定到属性中去了

但是我们会发现，如果需要绑定的值很多，一个个绑定会累到死，所以springBoot提供绑定一个对象bean，新建Config.java

package com.xmlxy.bean;

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;

@Component
@ConfigurationProperties(prefix = "date")
@Data
public class Config {
    private String year;
    private String month;
    private String day;
    private String hour;
    private String minute;

}

如果IDEA没配置lombok可以百度配置一下，这样就省得写get and set的一些函数，然后在改下DemoController.class类

package com.xmlxy.firstspringbootproject;

import com.xmlxy.bean.Config;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
/*测试类 2019-7-29*/
@ComponentScan("com.xmlxy.bean")
@RestController
public class DemoController
{
    @Autowired
    private Config config;

    @RequestMapping(value = "/demo",method = RequestMethod.GET)
    public String demo()
    {
        return "Hello SpringBoot";
    }

    @RequestMapping(value = "/demo1",method = RequestMethod.GET)
    public String demo1()
    {
        return config.getYear() + "." + config.getMonth() + "." + config.getDay() + "  " + config.getHour() + ":" + config.getMinute();
    }
}

输出的结果与上面一致。而且在配置文件中各个属性的参数是可以互相引用的

application.properties

date.year = 2019
date.month = 7
date.day = 29
date.hour = 14
date.minute = 54
date.desc = ${date.year}.${date.month}.${date.day} ${date.hour}:${date.minute}

DemoController.java新添加一个例

package com.xmlxy.firstspringbootproject;

import com.xmlxy.bean.Config;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
/*测试类 2019-7-29*/
@ComponentScan("com.xmlxy.bean")
@RestController
public class DemoController
{
    @Autowired
    private Config config;

    @Value("${date.desc}")
    private String desc;

    @RequestMapping(value = "/demo",method = RequestMethod.GET)
    public String demo()
    {
        return "Hello SpringBoot";
    }

    @RequestMapping(value = "/demo1",method = RequestMethod.GET)
    public String demo1()
    {
        return config.getYear() + "." + config.getMonth() + "." + config.getDay() + "  " + config.getHour() + ":" + config.getMinute();
    }
    @RequestMapping(value = "/demo2",method = RequestMethod.GET)
    public String demo2()
    {
        return desc;
    }
}

访问 http://127.0.0.1:8080/demo2

随机数

通过${random}来产生随机数，包括int值，long等，支持属性的随机值。

date.year = 2019
date.month = 7
date.day = 29
date.hour = 14
date.minute = 54
date.desc = ${date.year}.${date.month}.${date.day} ${date.hour}:${date.minute}
date.value = ${random.int}

DemoController.java

package com.xmlxy.firstspringbootproject;

import com.xmlxy.bean.Config;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
/*测试类 2019-7-29*/
@ComponentScan("com.xmlxy.bean")
@RestController
public class DemoController
{
    @Autowired
    private Config config;

    @Value("${date.desc}")
    private String desc;

    @Value("${date.value}")
    private int value;

    @RequestMapping(value = "/demo",method = RequestMethod.GET)
    public String demo()
    {
        return "Hello SpringBoot";
    }

    @RequestMapping(value = "/demo1",method = RequestMethod.GET)
    public String demo1()
    {
        return config.getYear() + "." + config.getMonth() + "." + config.getDay() + "  " + config.getHour() + ":" + config.getMinute();
    }
    @RequestMapping(value = "/demo2",method = RequestMethod.GET)
    public String demo2()
    {
        return desc;
    }

    @RequestMapping(value = "/demo3",method = RequestMethod.GET)
    public String demo3()
    {
        return String.valueOf(value);
    }

}

访问 http://127.0.0.1:8080/demo3 得

自定义配置文件

 引入自定义的配置文件jdbc.properties

jdbc.url = 10.105.9.119

将jdbc的配置文件引入

package com.xmlxy.firstspringbootproject;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.context.annotation.PropertySource;

@SpringBootApplication
@PropertySource(value = "classpath:jdbc.properties",encoding = "utf-8")
public class FirstSpringbootProjectApplication {

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

}

测试获取下url属性值

package com.xmlxy.firstspringbootproject;

import com.xmlxy.bean.Config;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
/*测试类 2019-7-29*/
@ComponentScan("com.xmlxy.bean")
@RestController
public class DemoController
{
    @Autowired
    private Config config;

    @Value("${date.desc}")
    private String desc;

    @Value("${date.value}")
    private int value;

    @Value("${jdbc.url}")
    private String url;

    @RequestMapping(value = "/demo",method = RequestMethod.GET)
    public String demo()
    {
        return "Hello SpringBoot";
    }

    @RequestMapping(value = "/demo1",method = RequestMethod.GET)
    public String demo1()
    {
        return config.getYear() + "." + config.getMonth() + "." + config.getDay() + "  " + config.getHour() + ":" + config.getMinute();
    }
    @RequestMapping(value = "/demo2",method = RequestMethod.GET)
    public String demo2()
    {
        return desc;
    }

    @RequestMapping(value = "/demo3",method = RequestMethod.GET)
    public String demo3()
    {
        return String.valueOf(value);
    }

    @RequestMapping(value = "/demo4",method = RequestMethod.GET)
    public String demo4()
    {
        return url;
    }
}

 jdbc连接数据库

pom.xml引入jdbc依赖支撑

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

application.properties

date.year = 2019
date.month = 7
date.day = 29
date.hour = 14
date.minute = 54
date.desc = ${date.year}.${date.month}.${date.day} ${date.hour}:${date.minute}
date.value = ${random.int}
spring.datasource.url = jdbc:mysql://10.105.9.119:3306/hwc_db?useUnicode=true&characterEncoding=UTF-8&useSSL=false
spring.datasource.driver-class-name = com.mysql.cj.jdbc.Driver
spring.datasource.username = root
spring.datasource.password = DsideaL147258369

dao接口

TestDao.java

package com.xmlxy.dao;

import com.xmlxy.bean.TestData;

public interface TestDao
{
    int add(TestData testDao);
}

TestDaoImp.java

package com.xmlxy.dao;

import com.xmlxy.bean.TestData;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import org.springframework.stereotype.Repository;

import java.util.HashMap;
import java.util.Map;

@Repository
public class TestDaoImp implements TestDao
{
    @Autowired
    private NamedParameterJdbcTemplate jdbcTemplate;
    @Override
    public int add(TestData testData) {

        String sql = "INSERT t_hwc_db(name,age) VALUES(:name,:age)";
        Map<String,Object> param = new HashMap<>();
        System.out.printf("本次插入的值===>" + testData.getName() + ",年龄为==>" + testData.getAge());
        param.put("name",testData.getName());
        param.put("age",testData.getAge());
        return jdbcTemplate.update(sql,param);
    }
}

访问接口测试

package com.xmlxy.firstspringbootproject;

import com.xmlxy.bean.Config;
import com.xmlxy.bean.TestData;
import com.xmlxy.dao.TestDaoImp;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
/*测试类 2019-7-29*/
@ComponentScan("com.xmlxy.bean")
@ComponentScan("com.xmlxy.dao")
@RestController
public class DemoController
{
    @Autowired
    private Config config;

    @Value("${date.desc}")
    private String desc;

    @Value("${date.value}")
    private int value;

    @Value("${jdbc.url}")
    private String url;

    @Autowired
    private TestDaoImp testDaoImp;

    @RequestMapping(value = "/demo",method = RequestMethod.GET)
    public String demo()
    {
        return "Hello SpringBoot";
    }

    @RequestMapping(value = "/demo1",method = RequestMethod.GET)
    public String demo1()
    {
        return config.getYear() + "." + config.getMonth() + "." + config.getDay() + "  " + config.getHour() + ":" + config.getMinute();
    }
    @RequestMapping(value = "/demo2",method = RequestMethod.GET)
    public String demo2()
    {
        return desc;
    }

    @RequestMapping(value = "/demo3",method = RequestMethod.GET)
    public String demo3()
    {
        return String.valueOf(value);
    }

    @RequestMapping(value = "/demo4",method = RequestMethod.GET)
    public String demo4()
    {
        return url;
    }

    @RequestMapping(value = "/demo5",method = RequestMethod.GET)
    public String demo5()
    {
        TestData testData = new TestData();
        testData.setName("ipad");
        testData.setAge(18);
        testDaoImp.add(testData);
        return "插入成功";
    }



}

访问 http://127.0.0.1:8080/demo5 查看数据库，可以发现数据已经插入