零教程

演示示例

这是我们需要通过修改XML输入文件附加%uA0<Result>Pass<Result/>

在</marks>标记结束

<?xml version="1.0"?>
<class>
   <student rollno="393">
      <firstname>dinkar</firstname>
      <lastname>kad</lastname>
      <nickname>dinkar</nickname>
      <marks>85</marks>
   </student>
   <student rollno="493">
      <firstname>Vaneet</firstname>
      <lastname>Gupta</lastname>
      <nickname>vinni</nickname>
      <marks>95</marks>
   </student>
   <student rollno="593">
      <firstname>jasvir</firstname>
      <lastname>singn</lastname>
      <nickname>jazz</nickname>
      <marks>90</marks>
   </student>
</class>

%uA0

SAXModifyDemo.java

package com.yiibai.xml

import java.io.*
import org.xml.sax.*
import javax.xml.parsers.*
import org.xml.sax.helpers.DefaultHandler

public class SAXModifyDemo extends DefaultHandler {
   static String displayText[] = new String[1000]
   static int numberLines = 0
   static String indentation = ""

   public static void main(String args[]) {

      try {	
         File inputFile = new File("input.txt")
         SAXParserFactory factory = 
         SAXParserFactory.newInstance()
         SAXModifyDemo obj = new SAXModifyDemo()
            obj.childLoop(inputFile)
         FileWriter filewriter = new FileWriter("newfile.xml")
         for(int loopIndex = 0 loopIndex < numberLines loopIndex++){
            filewriter.write(displayText[loopIndex].toCharArray())
            filewriter.write(&apos\n&apos)
            System.out.println(displayText[loopIndex].toString())
         }
         filewriter.close()
      }
      catch (Exception e) {
         e.printStackTrace(System.err)
      }
   }

   public void childLoop(File input){
      DefaultHandler handler = this
         SAXParserFactory factory = SAXParserFactory.newInstance()
      try {
         SAXParser saxParser = factory.newSAXParser()
         saxParser.parse(input, handler)
      } catch (Throwable t) {}
   }

   public void startDocument() {
      displayText[numberLines] = indentation
      displayText[numberLines] += "<?xml version=\"1.0\" encoding=\""+
         "UTF-8" + "\"?>"
      numberLines++
   }

   public void processingInstruction(String target,
      String data) {
      displayText[numberLines] = indentation
      displayText[numberLines] += "<?"
      displayText[numberLines] += target
      if (data != null && data.length() > 0) {
         displayText[numberLines] += &apos &apos
         displayText[numberLines] += data
      }
      displayText[numberLines] += "?>"
      numberLines++
   }

   public void startElement(String uri, String localName,
      String qualifiedName, Attributes attributes) {
      displayText[numberLines] = indentation

      indentation += "    "

      displayText[numberLines] += &apos<&apos
      displayText[numberLines] += qualifiedName
      if (attributes != null) {
         int numberAttributes = attributes.getLength()
         for (int loopIndex = 0 loopIndex < numberAttributes
            loopIndex++){
            displayText[numberLines] += &apos &apos
            displayText[numberLines] += attributes.getQName(loopIndex)
            displayText[numberLines] += "=\""
            displayText[numberLines] += attributes.getValue(loopIndex)
            displayText[numberLines] += &apos"&apos
         }
      }
      displayText[numberLines] += &apos>&apos
      numberLines++
   }

   public void characters(char characters[],
      int start, int length) {
      String characterData = (new String(characters, start, length)).trim()
      if(characterData.indexOf("\n") < 0 && characterData.length() > 0) {
         displayText[numberLines] = indentation
         displayText[numberLines] += characterData
         numberLines++
      }
   }

   public void endElement(String uri, String localName,
      String qualifiedName) {
      indentation = indentation.substring(0, indentation.length() - 4) 
      displayText[numberLines] = indentation
      displayText[numberLines] += "</"
      displayText[numberLines] += qualifiedName
      displayText[numberLines] += &apos>&apos
      numberLines++

      if (qualifiedName.equals("marks")) {
            startElement("", "Result", "Result", null)
            characters("Pass".toCharArray(), 0, "Pass".length())
            endElement("", "Result", "Result")
      }
   }
}

这将产生以下结果：

<?xml version="1.0" encoding="UTF-8"?>
<class>
    <student rollno="393">
        <firstname>
            dinkar
        </firstname>
        <lastname>
            kad
        </lastname>
        <nickname>
            dinkar
        </nickname>
        <marks>
            85
        </marks>
        <Result>
            Pass
        </Result>
    </student>
    <student rollno="493">
        <firstname>
            Vaneet
        </firstname>
        <lastname>
            Gupta
        </lastname>
        <nickname>
            vinni
        </nickname>
        <marks>
            95
        </marks>
        <Result>
            Pass
        </Result>
    </student>
    <student rollno="593">
        <firstname>
            jasvir
        </firstname>
        <lastname>
            singn
        </lastname>
        <nickname>
            jazz
        </nickname>
        <marks>
            90
        </marks>
        <Result>
            Pass
        </Result>
    </student>
</class>