关于dom4j如何读取xml文件。在jsp页面!

关于dom4j怎么读取xml文件。。在jsp页面!急
首先我写了一个方法，用dom4j拿到mbs.xml文件，又写了一个测试文件（test.java)，看这个方法能不能用，这个test.java。里面用的是main方法输出的。没有问题，控制台能输入xml里的值。，后来，我又写了几个jsp和servlet，想把这个xml的值，在页面上输入出来，报错，说找不到xml文件了，这个用jsp怎么写。
先贴几个代码，谢谢了
这是显示的那个servlet代码，用来在页面上输入的。

Java code

Message m = new Message();        LookMessage lm = new LookMessage();        List list = new ArrayList();        try {            list = lm.getMessage();        } catch (Exception e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        out.println("<title>查看留言</title>");        out.println("<table align=center border=1");        out.println("<tr><td colspan=3><font color=red>已发表留言有</font></td></tr>");        out.println("<tr><td><font color=red>姓名</font></td></tr><td><font color=red>内容</font></td><td><font color=red>时间</font></td>");        for(int i=0;i<list.size();i++){            m = (Message) list.get(i);            out.println("<tr><td>"+m.getName()+"</td></tr>");            out.println("<tr><td>"+m.getContents()+"</td></tr>");            out.println("<tr><td>"+m.getDate()+"</td></tr>");        }        out.println("</table>");

这是拿到xml文件的一个方法，放在LookMessage.java里面， 就是在这我写了含有main方法的test文件没有问题。

Java code

public List getMessage() {        // TODO Auto-generated method stub                List list = new ArrayList();        StringBuffer sb = new StringBuffer();        SAXReader reader = new SAXReader();        Document doc = null;        try {            doc = reader.read(new File("mbs.xml"));        } catch (DocumentException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }                Element root = doc.getRootElement();                List nodes = root.elements("value");        for(Iterator it = nodes.iterator();it.hasNext();){//循环有几个"value"节点            Element elm = (Element) it.next();            Message m = new Message();            for(Iterator itr = elm.elementIterator();itr.hasNext();){//循环“value”下面的节点                Element e1 = (Element) itr.next();                m.setName(e1.getText());                                Element e2 = (Element) itr.next();                m.setContents(e2.getText());                                Element e3 = (Element) itr.next();                m.setDate(e3.getText());                                list.add(m);                //                System.out.println("根节点"+e.getText());            }                    }        return list;    }

后来错误信息是（好长好长的）主要是找不到文件 ，是不是可以有别的文件输入，或者，我的方法不对的。
org.dom4j.DocumentException: mbs.xml (系统找不到指定的文件。) Nested exception: mbs.xml (系统找不到指定的文件。)
at org.dom4j.io.SAXReader.read(SAXReader.java:266)
at com.java.mge.LookMessage.getMessage(LookMessage.java:30)
at com.java.mge.LookM.doGet(LookM.java:53)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
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:230)
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:261)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)
Nested exception: 
java.io.FileNotFoundException: mbs.xml (系统找不到指定的文件。)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(Unknown Source)
at org.dom4j.io.SAXReader.read(SAXReader.java:243)
at com.java.mge.LookMessage.getMessage(LookMessage.java:30)
at com.java.mge.LookM.doGet(LookM.java:53)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
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:230)
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:261)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)
Nested exception: java.io.FileNotFoundException: mbs.xml (系统找不到指定的文件。)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(Unknown Source)
at org.dom4j.io.SAXReader.read(SAXReader.java:243)
at com.java.mge.LookMessage.getMessage(LookMessage.java:30)
at com.java.mge.LookM.doGet(LookM.java:53)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
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:230)
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:261)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)
java.lang.NullPointerException
at com.java.mge.LookMessage.getMessage(LookMessage.java:36)
at com.java.mge.LookM.doGet(LookM.java:53)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
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:230)
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:261)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)


[解决办法]
new File("mbs.xml")中文件地址不对。。。获取xml文件正确的存放路径。。。

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