Spring Jndi上下文和PropertyPlaceholderConfigurer [英] Spring Jndi Context and PropertyPlaceholderConfigurer

问题描述

定义数据。 ... web.xml中的

 < env-entry> 
< env-entry-name> varName< / env-entry-name> 
< env-entry-value> 56< / env-entry-value> 
< env-entry-type> java.lang.String< / env-entry-type> 
< / env-entry> 
  

使用java查看

  Context envEntryContext =（Context）new InitialContext（）。lookup（java：comp / env）; 
 String mydata =（String）envEntryContext.lookup（varName）; 
  

但是我想把数据放在我的common.xml中，如

 < bean id =propertyPlaceholderConfigurer
 class =org.springframework.beans.factory.config.PropertyPlaceholderConfigurer> 
< property name =locations> 
< list> 
< value> /WEB-INF/context/servweb.properties< / value> 
< / list> 
< / property> 
< property name =ignoreUnresolvablePlaceholders> 
< value> true< / value> 
< / property> 
< / bean> 
  

可能是这样的东西

 < constructor-arg> 
< jee：jndi-lookup jndi-name =java：comp / envdefault-value =data/> 
< / constructor-arg> 
  

但是上下文做同样的

 上下文envEntryContext =（Context）new InitialContext（）。lookup（java：comp / env）; 
 String mydata =（String）envEntryContext.lookup（varName）; 
  

可能是这样的：

 < constructor-arg> 
< jee：jndi-lookup jndi-name =java：comp / env> 
< jee：environment> 
 varName = default 
< / jee：environment> 
< / jee：jndi-lookup> 
  

任何人都知道正确的方式？

感谢提前

解决方案

您可以创建自己的PropertyPlaceholderConfigurer

  public class JndiPropertyPlaceholderConfigurer extends PropertyPlaceholderConfigurer {
 
 private String jndiPrefix =java：comp / env /; 
 private JndiTemplate jndiTemplate = new JndiTemplate（）; 
 
 @Override 
 protected String resolvePlaceholder（String placeholder，Properties props）{
 String value = null; 
 value = resolveJndiPlaceholder（placeholder）; 
 if（value == null）{
 value = super.resolvePlaceholder（placeholder，props）; 
} 
返回值; 
} 
 
 private String resolveJndiPlaceholder（String placeholder）{
 try {
 String value =（String）jndiTemplate.lookup（jndiPrefix + placeholder，String.class）; 
返回值; 
} catch（NamingException e）{
 //忽略
} 
返回null; 
} 
 
 public void setJndiPrefix（String jndiPrefix）{
 this.jndiPrefix = jndiPrefix; 
} 
 
 public void setJndiTemplate（JndiTemplate jndiTemplate）{
 this.jndiTemplate = jndiTemplate; 
} 
} 
  

然后在您的 applicationContext.xml

 < bean id =propertyPlaceholderConfigurer
 class = mypkg.helper.JndiPropertyPlaceholderConfigurer> 
< property name =properties> 
<道具> 
< prop key =varName> default< / prop> 
< / props> 
< / property> 
< / bean> 
  

或定义属性文件中的默认值

$ b $
class =mypkg.helper.JndiPropertyPlaceholderConfigurer>
< property name =locationvalue =classpath：/defaults.properties/>
< / bean>

Using Spring, I want to read a variable inside the context of Webspehere.

Read a Environment Variable in Java with Websphere

To define the data.... inside web.xml

<env-entry>
   <env-entry-name>varName</env-entry-name>
   <env-entry-value>56</env-entry-value>
   <env-entry-type>java.lang.String</env-entry-type>
</env-entry>

To see with java

Context envEntryContext = (Context) new InitialContext().lookup("java:comp/env");
String mydata = (String)envEntryContext.lookup("varName");

But I want take the data in my common.xml like

<bean id="propertyPlaceholderConfigurer"
    class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="locations">
        <list>
            <value>/WEB-INF/context/servweb.properties</value>
        </list>
    </property>
    <property name="ignoreUnresolvablePlaceholders">
        <value>true</value>
    </property>
</bean>

maybe with something like that

 <constructor-arg>
     <jee:jndi-lookup jndi-name="java:comp/env" default-value="data" /> 
  </constructor-arg>

but with context for do the same that

Context envEntryContext = (Context) new InitialContext().lookup("java:comp/env");
String mydata = (String)envEntryContext.lookup("varName");

maybe something like that:

 <constructor-arg>
    <jee:jndi-lookup  jndi-name="java:comp/env">
      <jee:environment>
          varName=default
     </jee:environment>
  </jee:jndi-lookup>

Anybody knows the correct way?

Thanks in Advance

解决方案

You can create your own PropertyPlaceholderConfigurer

public class JndiPropertyPlaceholderConfigurer extends PropertyPlaceholderConfigurer {

    private String jndiPrefix = "java:comp/env/";
    private JndiTemplate jndiTemplate = new JndiTemplate();

    @Override
    protected String resolvePlaceholder(String placeholder, Properties props) {
        String value = null;
        value = resolveJndiPlaceholder(placeholder);
        if (value == null) {
            value = super.resolvePlaceholder(placeholder, props);
        }
        return value;
    }

    private String resolveJndiPlaceholder(String placeholder) {
        try {
            String value = (String)jndiTemplate.lookup(jndiPrefix + placeholder, String.class);
            return value;
        } catch (NamingException e) {
            // ignore
        } 
        return null;
    }

    public void setJndiPrefix(String jndiPrefix) {
        this.jndiPrefix = jndiPrefix;
    }

    public void setJndiTemplate(JndiTemplate jndiTemplate) {
        this.jndiTemplate = jndiTemplate;
    }
}

and then use it in your applicationContext.xml

<bean id="propertyPlaceholderConfigurer"
      class="mypkg.helper.JndiPropertyPlaceholderConfigurer">
    <property name="properties">
        <props>
            <prop key="varName">default</prop>
        </props>
    </property>
</bean>

or for defining the default values in a properties file

<bean id="propertyPlaceholderConfigurer"
      class="mypkg.helper.JndiPropertyPlaceholderConfigurer">
    <property name="location" value="classpath:/defaults.properties"/>
</bean>

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