我是疯狂的石头 看看这篇文章 http://blog.csdn.net/daryl715/archive/2007/07/25/1707161.aspx
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package test.xml;
import java.io.File;
import java.io.IOException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.NodeList;
import org.w3c.dom.Document;public class readxml {
public static void main(String arg[]){
File file=new File("NewFile.xml");
Document doc=null;
try {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
doc = db.parse(file);
} catch (IOException ioe) {
System.out.println("can not find the xml");
} catch (Exception e) {
System.out.println(e.getMessage());
}
NodeList messages = doc.getElementsByTagName("MESSAGE"); for (int i = 0; i < messages.getLength(); i++) {
int message_id = 14;
message_id = message_id + i;
System.out.println("MESSAGE_ID:" + message_id);
String conf_num = doc.getElementsByTagName("CONF_NUM").item(i)
.getFirstChild().getNodeValue();
System.out.println("CONF_NUM:" + conf_num);
String message_time = doc.getElementsByTagName("MESSAGE_TIME")
.item(i).getFirstChild().getNodeValue();
System.out.println("MESSAGE_TIME:" + message_time);
String message_from = doc.getElementsByTagName("MESSAGE_FROM")
.item(i).getFirstChild().getNodeValue();
System.out.println("MESSAGE_FROM:" + message_from);
String messgae_to = doc.getElementsByTagName("MESSAGE_TO").item(i)
.getFirstChild().getNodeValue();
System.out.println("MESSAGE_TO:" + messgae_to);
String message_subject = doc
.getElementsByTagName("MESSAGE_SUBJECT").item(i)
.getFirstChild().getNodeValue();
System.out.println("MESSAGE_SUBJECT:" + message_subject);
String message_encoding = doc.getElementsByTagName(
"MESSAGE_ENCODING").item(i).getFirstChild().getNodeValue();
System.out.println("MESSAGE_ENCODING:" + message_encoding);
String message_flag = doc.getElementsByTagName("MESSAGE_FLAG")
.item(i).getFirstChild().getNodeValue();
System.out.println("MESSAGE_FLAG:" + message_flag);
String message_status = doc.getElementsByTagName("MESSAGE_STATUS")
.item(i).getFirstChild().getNodeValue();
System.out.println("MESSAGE_STATUS:" + message_status);
String network_id = doc.getElementsByTagName("NETWORK_ID").item(i)
.getFirstChild().getNodeValue();
System.out.println("NETWORK_ID:" + network_id);
String message_direction = doc.getElementsByTagName(
"MESSAGE_DIRECTION").item(i).getFirstChild().getNodeValue();
System.out.println("MESSAGE_DIRECTION:" + message_direction);
String result = doc.getElementsByTagName("RESULT").item(i)
.getFirstChild().getNodeValue();
System.out.println("RESULT:" + result);
String extend_desc = doc.getElementsByTagName("EXTEND_DESC")
.item(i).getFirstChild().getNodeValue();
System.out.println("EXTEND_DESC:" + extend_desc);
System.out.println("*****************");
}
}}NewFile.xml文件内容<?xml version="1.0" encoding="UTF-8"?>
<RETRIEVEMESSAGES> <MESSAGE MESSAGE_ID="14">
<CONF_NUM>200000014</CONF_NUM>
<MESSAGE_TIME>2005/03/22 19:06:39</MESSAGE_TIME>
<MESSAGE_FROM>test1</MESSAGE_FROM>
<MESSAGE_TO>sc1</MESSAGE_TO>
<MESSAGE_SUBJECT>test to sc1</MESSAGE_SUBJECT>
<MESSAGE_ENCODING>ASCII</MESSAGE_ENCODING>
<MESSAGE_FLAG>READ</MESSAGE_FLAG>
<MESSAGE_STATUS>Delivered</MESSAGE_STATUS>
<NETWORK_ID>3</NETWORK_ID>
<MESSAGE_DIRECTION>Mobile Terminated</MESSAGE_DIRECTION>
<RESULT>1</RESULT>
<EXTEND_DESC>Success</EXTEND_DESC>
</MESSAGE>
<MESSAGE MESSAGE_ID="15">
<CONF_NUM>200000015</CONF_NUM>
<MESSAGE_TIME>2005/03/23 18:26:21</MESSAGE_TIME>
<MESSAGE_FROM>test1</MESSAGE_FROM>
<MESSAGE_TO>sc2</MESSAGE_TO>
<MESSAGE_SUBJECT>test to sc2</MESSAGE_SUBJECT>
<MESSAGE_ENCODING>ASCII</MESSAGE_ENCODING>
<MESSAGE_FLAG>READ</MESSAGE_FLAG>
<MESSAGE_STATUS>Delivered</MESSAGE_STATUS>
<NETWORK_ID>3</NETWORK_ID>
<MESSAGE_DIRECTION>Mobile Terminated</MESSAGE_DIRECTION>
<RESULT>1</RESULT>
<EXTEND_DESC>Success</EXTEND_DESC>
</MESSAGE>
</RETRIEVEMESSAGES>我把
NewFile.xml 放在了
这里
运行提示错误是
can not find the xml
Exception in thread "main" java.lang.NullPointerException
at test.xml.readxml.main(readxml.java:24)
为什么 谢谢大家了
Exception in thread "main" java.lang.NullPointerException
at test.xml.readxml.main(readxml.java:24)你的XML文件不在CLASSPATH当中而找不到,要不你写死绝对路径再试试。