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SAX 解析器 - 修改 XML 文档
演示示例
这是我们需要通过在</marks> 标记末尾附加<Result>Pass<Result/>来修改的输入 xml 文件。
<?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>Vineet</firstname> <lastname>Gupta</lastname> <nickname>Vinni</nickname> <marks>95</marks> </student> <student rollno = "593"> <firstname>Jasvir</firstname> <lastname>Singh</lastname> <nickname>Jazz</nickname> <marks>90</marks> </student> </class>
SAXModifyDemo.java
package com.tutorialspoint.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('\n'); 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] += ' '; displayText[numberLines] += data; } displayText[numberLines] += "?>"; numberLines++; } public void startElement(String uri, String localName, String qualifiedName, Attributes attributes) { displayText[numberLines] = indentation; indentation += " "; displayText[numberLines] += '<'; displayText[numberLines] += qualifiedName; if (attributes != null) { int numberAttributes = attributes.getLength(); for (int loopIndex = 0; loopIndex < numberAttributes; loopIndex++){ displayText[numberLines] += ' '; displayText[numberLines] += attributes.getQName(loopIndex); displayText[numberLines] += "=\""; displayText[numberLines] += attributes.getValue(loopIndex); displayText[numberLines] += '"'; } } displayText[numberLines] += '>'; 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] += '>'; numberLines++; if (qualifiedName.equals("marks")) { startElement("", "Result", "Result", null); characters("Pass".toCharArray(), 0, "Pass".length()); endElement("", "Result", "Result"); } } }
上述程序将生成以下结果 -
<?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> Vineet </firstname> <lastname> Gupta </lastname> <nickname> Vinni </nickname> <marks> 95 </marks> <Result> Pass </Result> </student> <student rollno = "593"> <firstname> Jasvir </firstname> <lastname> Singh </lastname> <nickname> Jazz </nickname> <marks> 90 </marks> <Result> Pass </Result> </student> </class>