属性文件 [英] properties file in web app

问题描述

首先，有很多解决方案，我已经读了很多他们。但由于某种原因，我不能工作。

我试图将我的配置数据外包给我的webapp，所以我可以在部署后进行配置。 p>

这是我的属性服务：

  public class PropertiesService {
 
属性属性; 
 public PropertiesService（）{
 try {
 properties = new Properties（）; 
 ClassLoader classLoader = Thread.currentThread（）。getContextClassLoader（）; 
 InputStream stream = classLoader.getResourceAsStream（META-INF / config.properties）; 
 properties.load（stream）; 
} catch（Exception e）{
 e.printStackTrace（）; 
} 
} 
 
 public String getHost（）{
 return properties.getProperty（server_host）; 
} 
 
 public String getServerName（）{
 return properties.getProperty（server_naming）; 
} 
} 
  

在调试后，我注意到变量流保持为null！但我不知道为什么 - 。

需要帮助： - ）

这里的错误日志：

  java.lang.NullPointerException 
 at java.util.Properties $ LineReader.readLine（Properties.java:418） 
 at java.util.Properties.load0（Properties.java:337）
 at java.util.Properties.load（Properties.java:325）
  

---

更新：

我现在做以下：

  properties.load（this.getClass（）。getResourceStream（/ config / config.properties ））; 
 

我还是得到一个nullPointerException

解决方案

从 META-INF 中取出，放入 src / config to config package in source，一旦构建，它将转到 /WEB-INF/classes/config/config.properties

和 this.getClass（）。getResourceAsStream（/ config / config.properties）;

strong>更新

，然后我在同一个项目中创建了一个 Service 类，它有一个方法。

  public static InputStream getConfigAsInputStream（）{
 return Service.class.getResourceAsStream（/ config / config.properties）; 
} 
  

比较您的

First, there are a lot of solutions out there and I have already read a lot of them. But for some reason I don't get it working.

I am trying to outsource my config data for my webapp, so that I can cnange it after deployment.

That is my properties service:

   public class PropertiesService {

 Properties properties;
     public PropertiesService() {
      try {
       properties = new Properties();
       ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
       InputStream stream = classLoader.getResourceAsStream("META-INF/config.properties");
       properties.load(stream);
      } catch (Exception e) {
       e.printStackTrace();
      }
     }

     public String getHost(){
      return properties.getProperty("server_host");
     }

     public String getServerName(){
      return properties.getProperty("server_naming");
     }
    }

After debugging I noticed that the variable stream remains null! But I don't know why -.-

Need help :-)

here the error log:

java.lang.NullPointerException
 at java.util.Properties$LineReader.readLine(Properties.java:418)
 at java.util.Properties.load0(Properties.java:337)
 at java.util.Properties.load(Properties.java:325)

---

Update

I do the following now:

properties.load(this.getClass().getResourceStream("/config/config.properties"));

And I still get a nullPointerException

解决方案

Take out from META-INF , put it in src/config direct to config package in source , upon build it will go to /WEB-INF/classes/config/config.properties

and this.getClass().getResourceAsStream("/config/config.properties");

Update

and then I created a Service Class in the same project which has a method.

public static InputStream getConfigAsInputStream(){
    return Service.class.getResourceAsStream("/config/config.properties");
}

This works..!!

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