Package io.microsphere.spring.config.env.annotation

Annotation Interface JsonPropertySource

@Target(TYPE)
@Retention(RUNTIME)
@Inherited
@Documented
@ResourcePropertySource(factory=JsonPropertySourceFactory.class)
public @interface JsonPropertySource

The extension annotation of @ResourcePropertySource providing a convenient and declarative mechanism for adding a JSON PropertySource to Spring's Environment. To be used in conjunction with @Configuration classes.

Using JsonPropertySource allows declarative loading of external JSON configuration files into the Spring application context's environment. It supports both single and wildcard resource locations, with optional sorting and encoding configurations.

Example Usage

Example 1: Basic usage

 
 @JsonPropertySource("classpath:/config/app.json")
 @Configuration
 public class AppConfig {
 }
 
 

Example 2: Using wildcard and custom sorting

 
 @JsonPropertySource(value = "classpath:/config/*.json",
                     resourceComparator = CustomResourceComparator.class)
 @Configuration
 public class AppConfig {
 }
 
 

Example 3: Optional JSON resource

 
 @JsonPropertySource(value = "classpath:/config/optional.json", ignoreResourceNotFound = true)
 @Configuration
 public class AppConfig {
 }
 
 

Example 4: Auto-refreshing property source

 
 @JsonPropertySource(value = "file:/data/config/app.json", autoRefreshed = true)
 @Configuration
 public class AppConfig {
 }
 
 

Example 5: For specifying the order of property sources

 @JsonPropertySource(value = "classpath:/app.json", first = true)
 @Configuration
 public class AppConfig {
     // configuration beans
 }
 

Example 6: Customizing the character encoding

 @JsonPropertySource(value = "classpath:/app.json", encoding = "ISO-8859-1")
 @Configuration
 public class AppConfig {
     // configuration beans
 }
 

Since:

1.0.0

Author:

Mercy

See Also:

• ResourcePropertySource
• JsonPropertySourceFactory
• MapPropertySource

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element	Description
String	after	The relative order after specified PropertySource
boolean	autoRefreshed	It indicates the property source is auto-refreshed when the configuration is changed.
String	before	The relative order before specified PropertySource
String	encoding	A specific character encoding for the given resources.
boolean	first	Indicates current PropertySource is first order or not If specified , before() and after() will be ignored, or last order.
boolean	ignoreResourceNotFound	Indicate if a failure to find a property resource should be ignored.
String	name	Indicate the name of this property source.
Class<? extends Comparator<org.springframework.core.io.Resource>>	resourceComparator	Indicate the resources to be sorted when value() specifies the resource location wildcards
String[]	value	Indicate the resource location(s) of the JSON file to be loaded.

Element Details

name

@AliasFor(annotation=ResourcePropertySource.class)
String name

Indicate the name of this property source.

See Also:

• PropertySource.getName()
• Resource.getDescription()

Default:

""

autoRefreshed

@AliasFor(annotation=ResourcePropertySource.class)
boolean autoRefreshed

It indicates the property source is auto-refreshed when the configuration is changed.

Returns:

default value is false

Default:

false

first

@AliasFor(annotation=ResourcePropertySource.class)
boolean first

Indicates current PropertySource is first order or not If specified , before() and after() will be ignored, or last order.

Returns:

default value is false

Default:

false

before

@AliasFor(annotation=ResourcePropertySource.class)
String before

The relative order before specified PropertySource

If not specified , current PropertySource will be added last.

If first() specified , current attribute will be ignored.

Returns:

the name of PropertySource, default value is the empty string

Default:

""

after

@AliasFor(annotation=ResourcePropertySource.class)
String after

The relative order after specified PropertySource

If not specified , current PropertySource will be added last.

If first() specified , current attribute will be ignored.

Returns:

the name of PropertySource, default value is the empty string

Default:

""

value

@AliasFor(annotation=ResourcePropertySource.class)
String[] value

Indicate the resource location(s) of the JSON file to be loaded.

For example, "classpath:/com/myco/app.json"

Resource location wildcards (e.g. **/*.json) also are permitted;

${...} placeholders will be resolved against any/all property sources already registered with the Environment.

Each location will be added to the enclosing Environment as its own property source, and in the order declared.

Default:

{}

resourceComparator

@AliasFor(annotation=ResourcePropertySource.class)
Class<? extends Comparator<org.springframework.core.io.Resource>> resourceComparator

Indicate the resources to be sorted when value() specifies the resource location wildcards

For example, "classpath:/com/myco/*.json", suppose there are two resources named "a.json" and "b.json" where two instances of Resource will be resolved, they are the sources of PropertySource, thus it has to sort them to indicate the order of PropertySource that will be added to the enclosing Environment.

Default is DefaultResourceComparator

See Also:

• DefaultResourceComparator

Default:

io.microsphere.spring.config.env.support.DefaultResourceComparator.class

ignoreResourceNotFound

@AliasFor(annotation=ResourcePropertySource.class)
boolean ignoreResourceNotFound

Indicate if a failure to find a property resource should be ignored.

true is appropriate if the JSON file is completely optional.

Default is false.

Default:

false

encoding

@AliasFor(annotation=ResourcePropertySource.class)
String encoding

A specific character encoding for the given resources.

Default is "UTF-8"

Default:

"UTF-8"