Question

1）使用此行修改$ CATALINA_HOME / conf / context.xml

<Environment name="testValue" value="hello world" type="java.lang.String" override="true" />

2）在新的web-app

的web.xml中添加它

<resource-env-ref>
    <resource-env-ref-name>testValue</resource-env-ref-name>
    <resource-env-ref-type>java.lang.String</resource-env-ref-type>
</resource-env-ref>

3）通过

检索此属性

Context ic = new InitialContext();
String value = (String)ic.lookup("testValue");
System.err.println("value = " + value);

收到以下错误：

javax.naming.NameNotFoundException: Name testValue is not bound in this Context
    at org.apache.naming.NamingContext.lookup(NamingContext.java:770)
    at org.apache.naming.NamingContext.lookup(NamingContext.java:153)
    at org.apache.naming.SelectorContext.lookup(SelectorContext.java:152)
    at javax.naming.InitialContext.lookup(InitialContext.java:392)
    at it.skillbill.at.CustomProperties.contextInitialized(CustomProperties.java:18)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3972)
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4467)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:546)
    at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:905)
    at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:740)
    at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:500)
    at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1277)
    at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:321)
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
    at org.apache.catalina.core.StandardHost.start(StandardHost.java:785)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
    at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
    at org.apache.catalina.core.StandardService.start(StandardService.java:519)
    at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:581)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)

我只有一个问题：为什么呢？

Answer 1

在这种情况下，您的web.xml中不需要“resource-env-ref”条目。当您想要引用像DataSource这样的已配置资源时，可以使用此选项。如果您只需要配置一些环境属性，您可以使用“环境”配置或使用web.xml中的专用“env-entry”。然后你可以使用“java：comp / env / testValue”

来引用值

Answer 2

我通过使用以下行检索此属性来解决此问题：

(String)ic.lookup("java:comp/env/testValue");

tomcat 6自定义属性资源

2 个答案: