如何在春季启动时从属性文件读取限定符? [英] How to read Qualifier from property file in spring boot?

问题描述

我有一个限定词，我从

public class TestController{
     @Autowired
     @Qualifier("jdbc")
     private JdbcTemplate jtm;
     //.....
}

限定词"jdbc"是定义为

The qualifier "jdbc" is the bean defined as

@Bean(name = "jdbc")
@Autowired
public JdbcTemplate masterJdbcTemplate(@Qualifier("prod") DataSource prod) {
            return new JdbcTemplate(prod);
        }

这是返回该限定符的数据源并可以正常工作的

This is the which returns the datasource for that qualifier and works fine.

现在，我想将限定符名称从application.properties中读取.所以我将代码更改为

Now I want to make the Qualifier name to be read from the application.properties. So I changed my code to

public class TestController{
     @Autowired
     @Qualifier("${database.connector.name}")
     private JdbcTemplate jtm;
     //.....

}

其中database.connector.name=jdbc在我的application.properties中.

where database.connector.name=jdbc in my application.properties.

但是当我这样做时，会引发

But when i do this this throws an error of

申请无法开始

APPLICATION FAILED TO START

说明:

main.java.rest.TestController中的字段userService需要一个Bean 键入找不到的"org.springframework.jdbc.core.JdbcTemplate".

Field userService in main.java.rest.TestController required a bean of type 'org.springframework.jdbc.core.JdbcTemplate' that could not be found.

动作:

考虑在其中定义类型为"org.springframework.jdbc.core.JdbcTemplate"的bean 您的配置.

Consider defining a bean of type 'org.springframework.jdbc.core.JdbcTemplate' in your configuration.

感谢您的帮助.

推荐答案

限定符不解析占位符.您可以将TestController类写为

Qualifier doesn't resolve placeholder. You can write your TestController class as

public class TestController {

    @Value("${database.connector.name}")
    private String name;

    private JdbcTemplate jtm;

    @Autowired
    public void setJdbcTemplate(ApplicationContext context) {

        jtm = (JdbcTemplate) context.getBean(name);
    }
}

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