引言
当我们通过@configurationproperties注解实现配置 bean的时候,如果默认的配置属性转换无法满足我们的需求的时候,我们可以根据自己的需求通过以下扩展方式对配置属性进行转换
propertyeditorsupport实现
下面的例子是把属性中定义的字符串转换成movie,并且把name的值大写
继承propertyeditorsupport并且实现propertyeditorregistrar接口
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 |
package com.paderlol.spring.practice.properties.editor;
import com.paderlol.spring.practice.properties.pojo.movie; import java.beans.propertyeditorsupport; import lombok.extern.slf4j.slf4j; import org.springframework.beans.propertyeditorregistrar; import org.springframework.beans.propertyeditorregistry;
/** * @author pader propertyeditor 在不同的包下面 */ @slf4j public class custommovieeditor extends propertyeditorsupport implements propertyeditorregistrar {
@override public string getastext() { movie movie = (movie) getvalue(); return movie == null ? "" : movie.getname(); }
@override public void setastext(string text) throws illegalargumentexception { log.info( "继承[propertyeditorsupport]类,转换数据={}" , text); string[] data = text.split( "-" ); movie movie = movie.builder().name(data[ 0 ] .touppercase()).seat(integer.parseint(data[ 1 ])) .build(); setvalue(movie); }
@override public void registercustomeditors(propertyeditorregistry registry) { registry.registercustomeditor(movie. class , this ); } } |
注册自定义的propertyeditor
|
1 2 3 4 5 6 7 8 9 10 11 12 |
@bean public customeditorconfigurer customeditorconfigurer() { customeditorconfigurer customeditorconfigurer = new customeditorconfigurer(); // 有两种注册方式 这是第一种 customeditorconfigurer.setpropertyeditorregistrars( new propertyeditorregistrar[]{ new custommovieeditor() }); // 第二 种 map< class <?>, class <? extends propertyeditor>> maps = new hashmap<>(); maps.put(movie. class ,custommovieeditor. class );
return customeditorconfigurer; } |
converter接口+@configurationpropertiesbinding注解
|
1 2 3 4 5 6 7 8 9 10 11 12 |
//注意 @component @configurationpropertiesbinding public class stringtopersonconverter implements converter<string, person> {
@override public person convert(string from) { log.info( "使用[converter]接口,转换数据={}" , from); string[] data = from.split( "," ); return person.builder().name(data[ 0 ]).age(integer.parseint(data[ 1 ])).build(); } } |
总结
以上两种实现方式结果,但是converter接口相比propertyeditor接口更加灵活一些,propertyeditor接口仅限于string转换,converter可以自定义别的,并且propertyeditor接口通常用于controller中的接收参数的转换。 @configurationpropertiesbinding是限定符注解@qualifier的派生类而已,参考org.springframework.boot.context.properties.conversionservicededucer，以下是源代码片段
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 |
@autowired (required = false ) @configurationpropertiesbinding public void setconverters(list<converter<?, ?>> converters) { this .converters = converters; }
/** * a list of custom converters (in addition to the defaults) to use when * converting properties for binding. * @param converters the converters to set */ @autowired (required = false ) @configurationpropertiesbinding public void setgenericconverters(list<genericconverter> converters) { this .genericconverters = converters; } |
|
1 2 3 4 5 6 7 8 9 10 11 12 13 |
public conversionservice getconversionservice() { try { //默认首先寻找bean名称叫conversionservice的conversionservice的bean类 return this .applicationcontext.getbean( configurableapplicationcontext.conversion_service_bean_name, conversionservice. class ); } catch (nosuchbeandefinitionexception ex) { //找不到就默认生成applicationconversionservice类 return this .applicationcontext.getautowirecapablebeanfactory() .createbean(factory. class ).create(); } } |
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
原文链接：https://segmentfault测试数据/a/1190000016941868
查看更多关于Spring Boot 2.0 配置属性自定义转换的方法的详细内容...