本文介绍了Java中JNDI的简单字符串值的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
如何在tomcat的配置中设置简单的字符串值然后在java应用程序中读取?
How can i set simple string value in configuration of tomcat and then read in java application?
context.xml
context.xml
<ResourceLink name="global/test" global="testing" type="java.lang.String" />
server.xml
server.xml
<Enviroment name="testing" value="myUser" type="java.lang.String"/>
应用程序中的web.xml
web.xml in application
<resource-env-ref>
<resource-env-ref-name>global/test</resource-env-ref-name>
<resource-env-ref-type>java.lang.String</resource-env-ref-type>
</resource-env-ref>
public String getValue(){
return new JndiDataSourceLookup().getDataSource("global/test").toString();
}
当我运行tomcat时,我看到这些错误......
When i Run tomcat, i see these errors...
org.springframework.jdbc.datasource.lookup.DataSourceLookupFailureException: Failed to look up JNDI DataSource with name 'global/test'; nested exception is javax.naming.NameNotFoundException: Name [global/test] is not bound in this Context. Unable to find [global].
javax.naming.NameNotFoundException: Name [global/test] is not bound in this Context. Unable to find [global].
推荐答案
在你的web.xml使用中,
In your web.xml use,
<env-entry>
<description>Sample env entry</description>
<env-entry-name>isConnected</env-entry-name>
<env-entry-type>java.lang.Boolean</env-entry-type><!--order matters -->
<env-entry-value>true</env-entry-value>
</env-entry>
在代码中,
try {
Context initCxt = new InitialContext();
Boolean isConn = (Boolean)initCxt.lookup("java:comp/env/isConnected");
System.out.println(isConn.toString());
// one could use relative names into the sub-context
Context envContext = (Context) initCxt.lookup("java:comp/env");
Boolean isConn2 = (Boolean)envContext.lookup("isConnected");
System.out.println(isConn2.toString());
} catch (NamingException e) {
e.printStackTrace();
}
看看这里,以便更好地理解InitialContext和JNDI。
Have a look here Naming service tutorial to get a good understanding of InitialContext and JNDI.
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