读取Springboot的三种方式

Posted 2023-03-25

参考技术A 1.通过Value注解

<code>

package com.hengan.springboottest.controller;

import org.springframework.beans.factory.annotation.Value;

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

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

@RestController

public class HelloController

//读取配置文件

    @Value("$user.uname")

private Stringuname;

@RequestMapping("/method1")

public String getProp()

return "读取配置文件的第一种方式:通过Value注解      "+uname;





</code>

2.通过Environment类

```

package com.hengan.springboottest.controller;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.core.env.Environment;

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

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

@RestController

public class HelloController

@Autowired

    private Environmentenv;

@RequestMapping("/method2")

public String getProp2()

return "读取配置文件的第二种方式Env：    "+env.getProperty("user.uname");





```

3.通过配置实体类

```

package com.hengan.springboottest.controller;

import org.springframework.beans.factory.annotation.Autowired;

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

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

@RestController

public class HelloController

@Autowired

    private ReadConfFilereadConfFile;

@RequestMapping("/method3")

public ReadConfFile getProp3()

return readConfFile;





```

  ```

package com.hengan.springboottest.controller;

import lombok.Data;

import lombok.ToString;

import org.springframework.boot.context.properties.ConfigurationProperties;

import org.springframework.context.annotation.PropertySource;

import org.springframework.stereotype.Component;

//用@Data省去了getter,setter

@Data

//@ToString注解免去了手动写toString方法

@ToString

//是否当前缀不符合时抛出异常

@ConfigurationProperties(prefix ="user",ignoreUnknownFields =false)

@PropertySource("classpath:")

//声明一个组件

@Component

public class ReadConfFile

private Stringuname;

private Stringpwd;

private Stringage;

private Stringaddr;

private Stringsex;



```