Important annotations of Spring boot Framework Learning 3 annotation Method Read External resource profile

The main contents of this section:

1: How to get Configuration items in a configuration file in a non-annotated way

2: Use annotations to Get External properties file configuration items

Statement:

This article is an important note for the Spring boot framework to learn preschool Mastery (3)-Read the external resource profile by annotating the Edith accompany you learn series-Framework learning Spring boot Framework learning. You are welcome to comment

One: How to get Configuration items in a configuration file in a non-annotated way

Description

In the project, some information needs to be configured in the file.

For example, we will configure FTP-related files in fto.properties.

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Before we want to get information about FTP, such as:

Used in Java classes:

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Tool Class: Getpropertiesvlaue class such as:

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In this way, you can get the values in the corresponding configuration file.

From the above, we can know that to get the values in the configuration file, you need to:

1: Need to know the filename (file name or file relative path)

2: Need to know the key in the get file.

such as the above:

static String Ftpserver = Getpropertiesvalue.getvalue (Ftpfile, "Ftpip");

This method is not feeling a bit troublesome.

Second: using annotations to Get External properties file configuration items

2.1: Annotations on the use of @propertysource and @value

Please look first, the following is the source of the demo:

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Source comments in the general meaning:

@configuration annotations are used in a class, and @propertysource is used for this annotation

The Key/value value in the corresponding file can be obtained from the propertysource annotation.

Next, let's take a look at the actual pseudo-code:

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Description

@propertysource: The note is the file used to read the configured address in value.

@value (${}): Where the value in ${} is the value of the key in the corresponding configuration file

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Consider the question:

1: What if multiple profiles are written?

2: What if the configuration file configured in the value of Propertysource is not present?

You are welcome to learn the next article. In the next article, we will explain how to deal with the problem of thinking.

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Related reading:

Spring Boot Framework Learn important notes for preschool mastery (4)-read external resource profiles by annotation 2

Important annotations of Spring boot Framework Learning 3 annotation Method Read External resource profile

Spring Boot Framework Learn important annotations for preschool Mastery (2)-Configure with Java configuration spring

Spring Boot Framework Learn the important annotations of preschool mastery (1)-sprng Java configuration method

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Important annotations of Spring boot Framework Learning 3 annotation Method Read External resource profile