如何用 sax 读取xml文件，请大侠指教

Question

新建一个Java类，实现通过 sax 读取xml文件，xml文件放在src根目录下，谢谢

Answer 1

  import org.xml.sax.Attributes;
import org.xml.sax.SAXParseException;
import org.xml.sax.SAXException;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.parsers.SAXParser;
import org.xml.sax.helpers.DefaultHandler;
        class SAXTest extends DefaultHandler{
            private StringBuffer buffer=new StringBuffer();
            public void parseURI(String uri)
            {
                try
                {
                    SAXParserFactory spf = SAXParserFactory.newInstance();
                    SAXParser sp = spf.newSAXParser();
                    sp.parse(uri,this);
                }
                catch (Exception e)
                {
                    e.printStackTrace();
                }
            }
            /** Start document. */
            public void startDocument()
            { 
                buffer.append("< ?xml version=\"1.0\"?>");
            } 
            /** Start element. */
            public void startElement(String namespaceURI, String localName,
                                     String rawName, Attributes attrs)
            {
                buffer.append("< ");
                buffer.append(rawName);
                if (attrs != null)
                {
                    int len = attrs.getLength();
                    for (int i = 0; i < len; i++)
                    {
                        buffer.append(" ");
                        buffer.append(attrs.getQName(i));
                        buffer.append("=\"");
                        buffer.append(attrs.getValue(i));
                        buffer.append("\"");
                    }
                }
                buffer.append(">");
            }
            /** Characters. */
            public void characters(char ch[], int start, int length)
            {
                buffer.append(new String(ch, start, length));
            }
            /** Ignorable whitespace. */
            public void ignorableWhitespace(char ch[], int start, int length)
            {
                characters(ch, start, length);
            }
            /** End element. */
            public void endElement(String namespaceURI, String localName,
                                   String rawName)
            {
                buffer.append("");
            } // endElement(String)
            /** End document. */
            public void endDocument()
            {
            }
            /** Processing instruction. */
            public void processingInstruction(String target, String data)
            {
                buffer.append("< ?");
                buffer.append(target);
                if (data != null && data.length() > 0)
                {
                    buffer.append(' ');
                    buffer.append(data);
                }
                buffer.append("?>");
            }
            /** Returns a string of the location. */
            private String getLocationString(SAXParseException ex)
            {
                StringBuffer str = new StringBuffer();
                String systemId = ex.getSystemId();
                if (systemId != null)
                {
                    int index = systemId.lastIndexOf('/');
                    if (index != -1)
                        systemId = systemId.substring(index + 1);
                    str.append(systemId);
                }
                str.append(':');
                str.append(ex.getLineNumber());
                str.append(':');
                str.append(ex.getColumnNumber());
                return str.toString();
            }
          public static void main(String args[]){
           SAXTest st=new SAXTest();
           st.parseURI("student.xml");
          System.out.println(st.buffer.toString());
        }
        }

Answer 2

运行报错java.io.FileNotFoundException: D:\JAVA\workspace\Stu_DWR\Student.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 java.io.FileInputStream.<init>(Unknown Source)
at sun.net.www.protocol.file.FileURLConnection.connect(Unknown Source)
at sun.net.www.protocol.file.FileURLConnection.getInputStream(Unknown Source)
at org.apache.xerces.impl.XMLEntityManager.setupCurrentEntity(Unknown Source)
at org.apache.xerces.impl.XMLVersionDetector.determineDocVersion(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at javax.xml.parsers.SAXParser.parse(Unknown Source)
at javax.xml.parsers.SAXParser.parse(Unknown Source)
at test.解析xml文件.SAXTest.parseURI(SAXTest.java:20)
at test.解析xml文件.SAXTest.main(SAXTest.java:104)文件在src根目录下: Student.xml
<?xml version="1.0" encoding="UTF-8"?>
<person> 
<name>王小明</name> 
<college>信息学院</college> 
<telephone>6258113</telephone> 
<notes>男,1955年生,博士，95年调入海南大学</notes> 
</person>
如果在src下test包中，如何写路径
请大侠指教，谢谢了

Answer 3

你看一下这个例子
import java.io.*;
import java.net.*;
import javax.xml.parsers.*;
import org.xml.sax.*;
import org.xml.sax.helpers.*;/**
 * This program demonstrates how to use a SAX parser. The program prints all hyperlinks links of an
 * XHTML web page. <br>
 * Usage: java SAXTest url
 * @version 1.00 2001-09-29
 * @author Cay Horstmann
 */
public class SAXTest
{
   public static void main(String[] args) throws Exception
   {
      String url;
      if (args.length == 0)
      {
         url = "http://www.w3c.org";
         System.out.println("Using " + url);
      }
      else url = args[0];      DefaultHandler handler = new DefaultHandler()
         {
            public void startElement(String namespaceURI, String lname, String qname,
                  Attributes attrs)
            {
               if (lname.equals("a") && attrs != null)
               {
                  for (int i = 0; i < attrs.getLength(); i++)
                  {
                     String aname = attrs.getLocalName(i);
                     if (aname.equals("href")) System.out.println(attrs.getValue(i));
                  }
               }
            }
         };      SAXParserFactory factory = SAXParserFactory.newInstance();
      factory.setNamespaceAware(true);
      SAXParser saxParser = factory.newSAXParser();
      InputStream in = new URL(url).openStream();
      saxParser.parse(in, handler);
   }
}

Answer 4

String dirBase = System.getProperty("user.dir")
dirBase +"/" +src/Student.xml

Answer 5

Using http://www.w3c.org
Exception in thread "main" java.io.IOException: Server returned HTTP response code: 503 for URL: http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at org.apache.xerces.impl.XMLEntityManager.setupCurrentEntity(Unknown Source)
at org.apache.xerces.impl.XMLEntityManager.startEntity(Unknown Source)
at org.apache.xerces.impl.XMLEntityManager.startDTDEntity(Unknown Source)
at org.apache.xerces.impl.XMLDTDScannerImpl.setInputSource(Unknown Source)
at org.apache.xerces.impl.XMLDocumentScannerImpl$DTDDispatcher.dispatch(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at javax.xml.parsers.SAXParser.parse(Unknown Source)
at javax.xml.parsers.SAXParser.parse(Unknown Source)
at test.解析xml文件.SAXTest.main(SAXTest.java:44)
还是报错如何取出xml文件中的内容，请大侠指教，谢谢

Answer 6

可以设置为不验证doctype 。

Answer 7

1、先下载：jdom-1.0.jar、dom4j-1.7.jar 这两个包引入到项目中
2、代码如下：MyXMLReader.java
import java.io.File;
import java.util.Iterator;
import java.util.List;import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;import org.dom4j.io.SAXReader;
import org.jdom.Element;
import org.jdom.input.SAXBuilder;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;public class MyXMLReader extends DefaultHandler {java.util.Stack tags = new java.util.Stack();
String path = "xmltest.xml";
//windows 系统获取路径
String rpath = MyXMLReader.class.getResource("").getPath().substring(1)
+ path;public MyXMLReader() {
super();
System.out.println("rpath:"+rpath);
}/**
* DOM方式
* @since V2.0
* @author David.Wei
* @date 2008-4-11
* @return void
*/
public void DOM() {
long lasting = System.currentTimeMillis();try {
File f = new File(rpath);
DocumentBuilderFactory factory = DocumentBuilderFactory
.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document doc = builder.parse(f);
NodeList nl = doc.getElementsByTagName("node");
for (int i = 0; i < nl.getLength(); i++) {
System.out.println("|| Name: |"
+ doc.getElementsByTagName("name").item(i)
.getFirstChild().getNodeValue());
System.out.println("||Space: |"
+ doc.getElementsByTagName("space").item(i)
.getFirstChild().getNodeValue());
System.out.println("-------------------------------------------------"); }
} catch (Exception e) {
e.printStackTrace();
}
System.out.println("DOM RUNTIME："
+ (System.currentTimeMillis() - lasting) + " MS");
}/**
* SAX方式
* @since V2.0
* @author David.Wei
* @date 2008-4-11
* @return void
*/
public void SAX() {long lasting = System.currentTimeMillis();
try {
SAXParserFactory sf = SAXParserFactory.newInstance();
SAXParser sp = sf.newSAXParser();
MyXMLReader reader = new MyXMLReader();
sp.parse(new InputSource(rpath), reader);
} catch (Exception e) {
e.printStackTrace();
}
System.out.println("SAX RUNTIME："
+ (System.currentTimeMillis() - lasting) + " MS");
}public void startElement(String uri, String localName, String qName,
Attributes attrs) {
tags.push(qName);
}public void characters(char ch[], int start, int length)
throws SAXException {
String tag = (String) tags.peek();
if (tag.equals("name")) {
System.out.println("|| Name: |" + new String(ch, start, length));
}
if (tag.equals("space")) {
System.out.println("||Space: |" + new String(ch, start, length));
}
System.out.println("-------------------------------------------------");
}/**
* JDOM方式
* @since V2.0
* @author David.Wei
* @date 2008-4-11
* @return void
*/
public void JDOM() {
long lasting = System.currentTimeMillis();
try {
SAXBuilder builder = new SAXBuilder();
org.jdom.Document doc = builder.build(new File(rpath));
Element foo = doc.getRootElement();
List allChildren = foo.getChildren();
for (int i = 0; i < allChildren.size(); i++) {
System.out.println("|| Name: |"
+ ((Element) allChildren.get(i)).getChild("name")
.getText());
System.out.println("||Space: |"
+ ((Element) allChildren.get(i)).getChild("space")
.getText());
System.out.println("-------------------------------------------------"); }
} catch (Exception e) {
e.printStackTrace();
}
System.out.println("JDOM RUNTIME："
+ (System.currentTimeMillis() - lasting) + " MS");
}/**
* DOM4J方式
* @since V2.0
* @author David.Wei
* @date 2008-4-11
* @return void
*/
public void DOM4J() {
long lasting = System.currentTimeMillis();
try {
File f = new File(rpath);
SAXReader reader = new SAXReader();
org.dom4j.Document doc = reader.read(f);
org.dom4j.Element root = doc.getRootElement();
org.dom4j.Element foo;
for (Iterator i = root.elementIterator("node"); i.hasNext();) {
foo = (org.dom4j.Element) i.next();
System.out.println("|| Name: |" + foo.elementText("name"));
System.out.println("||Space: |" + foo.elementText("space"));
System.out.println("-------------------------------------------------");
}
} catch (Exception e) {
e.printStackTrace();
}
System.out.println("DOM4J RUNTIME："
+ (System.currentTimeMillis() - lasting) + " MS");
}public static void main(String arge[]) {
MyXMLReader myXML = new MyXMLReader();
System.out.println("=====================DOM=========================");
myXML.DOM();
System.out.println("=====================SAX=========================");
myXML.SAX();
System.out.println("=====================JDOM========================");
myXML.JDOM();
System.out.println("=====================DOM4J=======================");
myXML.DOM4J();
System.out.println("=================================================");
}
}3、xmltest.xml
<?xml version="1.0" encoding="gbk"?>
<list>
<node>
<name>weidewei</name>
<space>http://wishlife.javaeye.com</space>
</node>
<node>
<name>flying</name>
<space>http://user.qzone.qq.com/94611981</space>
</node>
</list>备注：xmltest.xml在src目录下
以上代码应该能满足你需求

Answer 8

运行发生异常rpath:D:/JAVA/workspace/Test/WebRoot/WEB-INF/classes/%e8%af%bb%e5%8f%96xml%e6%96%87%e4%bb%b6/xmltest.xml
=====================SAX=========================
rpath:D:/JAVA/workspace/Test/WebRoot/WEB-INF/classes/%e8%af%bb%e5%8f%96xml%e6%96%87%e4%bb%b6/xmltest.xml
java.io.FileNotFoundException: D:\JAVA\workspace\Test\WebRoot\WEB-INF\classes\读取xml文件\xmltest.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 java.io.FileInputStream.<init>(Unknown Source)
at sun.net.www.protocol.file.FileURLConnection.connect(Unknown Source)
at sun.net.www.protocol.file.FileURLConnection.getInputStream(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLVersionDetector.determineDocVersion(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
at javax.xml.parsers.SAXParser.parse(Unknown Source)
at 读取xml文件.MyXMLReader.SAX(MyXMLReader.java:80)
at 读取xml文件.MyXMLReader.main(MyXMLReader.java:107)
SAX RUNTIME：31 MS

Answer 9

String str = xxx.class.getResource("/Student.xml").getPath();  //路径;