使用PropertyPlaceholderConfigurer和PropertySource(Using both PropertyPlaceholderConfigurer and PropertySource)

 我在这里遇到了一些困难。 我正在设计一个实用程序，我需要我的Spring上下文将命令行参数作为属性来处理。 这很容易完成： 
 
if (args != null && args.length > 0) {
    PropertySource<?> ps = new SimpleCommandLinePropertySource(args);
    ctx.getEnvironment().getPropertySources().addFirst(ps);
}
 
 我遇到的问题是下一步：为了符合我的企业框架，我必须设置一个他们提供的PropertyPlaceholderConfigurer 1 。 也很容易完成。 
 
@Bean
public PropertyPlaceholderConfigurer propertyPlaceholderConfigurer() {
    return new MyPropertyPlaceholderConfigurer();
}
 
 问题是，一旦后者被设置，以前与命令行一起工作的是不是，我有错误： 
 
 
 
 java.lang.IllegalArgumentException：无法解析字符串值“$ {input.file}”中的占位符'input.file' 
 
 
 现在，我知道使用两者远非理想（理想情况下，我甚至不应该使用PropertyPlaceholderConfigurer ，而是使用PropertySourcesPlaceholderConfigurer ）。 然而，我对配置器没有选择余地。 
 
 因此，我认为我必须用我的PropertySource改变一些东西，但我对如何以优雅的方式做到这一点感到不知所措。 我应该扩展PropertyPlaceholderConfigurer以添加PropertySource吗？ 这甚至有可能吗？ 
 
 在这种情况下，最佳解决方案是什么？ 即使模糊的线索也是受欢迎的，因为我不知道要走哪条路。 
 
 （Spring版本：4.1.6） 
 
 
 1.此PropertyPlaceholderConfigurer加载一些属性文件并应用一些额外的处理（例如，允许在属性文件中加密值）。 

I am having a bit of a difficulty here. I am designing a utility for which I require the ability for my Spring context to treat command-line arguments as properties. This was easily done:
 
if (args != null && args.length > 0) {
    PropertySource<?> ps = new SimpleCommandLinePropertySource(args);
    ctx.getEnvironment().getPropertySources().addFirst(ps);
}
 
What I have a problem with is the next step: to be compliant with my enterprise framework, I must set a PropertyPlaceholderConfigurer they provide1. Easily done too.
 
@Bean
public PropertyPlaceholderConfigurer propertyPlaceholderConfigurer() {
    return new MyPropertyPlaceholderConfigurer();
}
 
The thing is, once the latter is set, what was previously working with the command-line is not, and I have errors:
 
 
 
java.lang.IllegalArgumentException: Could not resolve placeholder 'input.file' in string value "${input.file}"
 
 
Now, I am aware using both is far from ideal (and that ideally, I should not even be using PropertyPlaceholderConfigurer but rather PropertySourcesPlaceholderConfigurer). Yet, I have no choice as to the configurer.
 
As a consequence, I think I must change something with my PropertySource, but I am at a loss as to how I can do it in an elegant way. Should I extend the PropertyPlaceholderConfigurer to add the PropertySource? Is that even possible?
 
What is the best solution to go for in this case? Even vague leads are welcome, since I don't know in which way to go.
 
(Spring version: 4.1.6)
 
 
1. This PropertyPlaceholderConfigurer loads some properties files and apply some additional processing (e.g. to allow encrypted values in the properties files).

原文：https://stackoverflow.com/questions/33547837