PS: dao.properties文件已经在classes根目录下了...

代码：

private Properties prop = null;
private String daoClass = null;

public Factory()
{
try
{
prop = new Properties();
InputStream in = ClassLoader.getSystemResourceAsStream("dao.properties"); //问题出现在这里读不到dao.properties文件
System.out.println("in:"+in); //总是打出null
prop.load(in);
daoClass = prop.getProperty("dao.class");
}
catch (Exception e) {
e.printStackTrace();
}
}

在线急等~~~~~~~~

大哥，再帮忙想下。。这会是什么问题。。。以前我记得也是这么读的配置文件。。

和之前一样，找不到doa.properties文件。。

in:null
java.lang.NullPointerException
at java.util.Properties$LineReader.readLine(Properties.java:418)
at java.util.Properties.load0(Properties.java:337)
at java.util.Properties.load(Properties.java:325)
at test.Factory.<init>(Factory.java:20)
at org.apache.jsp.a_jsp._jspService(a_jsp.java:65)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:384)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:228)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:216)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:634)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:445)
at java.lang.Thread.run(Thread.java:619)

谢了，哥们儿。。

是下面这样，不用ClassLoader去getResource，直接用getClass().getResource()就可以了。。呵呵。。

InputStream in = getClass().getResourceAsStream("dao.properties");

耽误你睡觉了。。多谢。。