Context context = new InitialContext();
dataSource = (DataSource) context.lookup("java:comp/env/jdbc/multiDS");
connection = dataSource.getConnection();
请帮我嘲笑上面的代码.
你好,汤姆·安德森
我试了下面的代码
@BeforeClass
public static void setUpClass() throws Exception {
// rcarver - setup the jndi context and the datasource
try {
// Create initial context
System.setProperty(Context.INITIAL_CONTEXT_FACTORY,"org.apache.naming.java.javaURLContextFactory");
System.setProperty(Context.URL_PKG_PREFIXES,"org.apache.naming");
Context ic = new InitialContext();
ic.createSubcontext("java:");
ic.createSubcontext("java:comp");
ic.createSubcontext("java:comp/env");
ic.createSubcontext("java:comp/env/jdbc");
ic.createSubcontext("java:comp/env/jdbc/multiDS");
// Construct DataSource
OracleConnectionPoolDataSource ds = new OracleConnectionPoolDataSource();
ds.setURL("jdbc:oracle:thin:@g9u0696.houston.hp.com:1525:CRNAD");
ds.setUser("uname");
ds.setPassword("pwd");
} catch (NamingException ex) {
ex.printstacktrace();
}
}
但其给出错误为：
com.hp.corona.common.exception.CacheException: org.apache.naming.NamingContext cannot be cast to javax.sql.DataSource
请帮我测试我只想从JNDI数据源连接的代码
解决方法
在这里做的正统的事情是改变你的代码,以便将Context注入它(通过依赖注入框架,或手动).然后,您只需在单元测试中通过模拟.
如果你不能这样做,你的代码必须创建IntialContext本身,那么你将需要设置一个假的JNDI实现,你可以在其中注入mocks.如果您在网上搜索“内存中的JNDI实现”或“模拟JNDI实现”,您会发现各种选项,或者您可以自己编写一个.基本上,您将需要一个InitialContextFactory的实现,它只返回一个合适的模拟,然后您可以通过设置java.naming.factory.initial系统属性来选择.
我在写必要的课程时遇到了一个裂缝.干得好：
public class MockInitialContextFactory implements InitialContextFactory {
private static final ThreadLocal<Context> currentContext = new ThreadLocal<Context>();
@Override
public Context getinitialContext(Hashtable<?,?> environment) throws NamingException {
return currentContext.get();
}
public static void setCurrentContext(Context context) {
currentContext.set(context);
}
public static void clearCurrentContext() {
currentContext.remove();
}
}
public class MockInitialContextRule implements TestRule {
private final Context context;
private MockInitialContextRule(Context context) {
this.context = context;
}
@Override
public Statement apply(final Statement base,Description description) {
return new Statement() {
@Override
public void evaluate() throws Throwable {
System.setProperty(Context.INITIAL_CONTEXT_FACTORY,MockInitialContextFactory.class.getName());
MockInitialContextFactory.setCurrentContext(context);
try {
base.evaluate();
} finally {
System.clearProperty(Context.INITIAL_CONTEXT_FACTORY);
MockInitialContextFactory.clearCurrentContext();
}
}
};
}
}
使用方法如下：
public class FooTest {
private final Context context = mock(Context.class);
@Rule
public MockInitialContextRule mockInitialContextRule = new MockInitialContextRule(context);
@Test
public void testName() throws Exception {
// set up stubbings on the context mock
// invoke the code under test
}
}