SAX解析XML出现特殊字符

import java.io.InputStream; import java.util.ArrayList; import java.util.List; import javax.xml.parsers.SAXParser; import javax.xml.parsers.SAXParserFactory; import org.xml.sax.Attributes; import org.xml.sax.SAXException; import org.xml.sax.helpers.DefaultHandler; public class SaxParseService extends DefaultHandler{ private List<Book> books = null; private Book book = null; private String preTag = null;//作用是记录解析时的上一个节点名称
    /** * 特殊字符数量很多时方法1显然不实用此时可用转义来实现 * &lt; < * &gt; > * &amp; & * &apos; ' * &quot; " * 即将xml中的特殊文档全部替换为转义字符 * 如<name><thinking in java ><name>变成<name>&lt;thinking in java&gt;<name>。 * 但是对于这种情况解析过程会发生变化不是一次性解析<thinking in java > * 而是分三步先解析&lt;然后是thinking in java然后是&gt; * 因此要注意想要获得<name>中数据必须要用StringBuffer将这三部分加起来。 * */ StringBuffer sb = new StringBuffer(); public List<Book> getBooks(InputStream xmlStream) throws Exception{ SAXParserFactory factory = SAXParserFactory.newInstance(); SAXParser parser = factory.newSAXParser(); SaxParseService handler = new SaxParseService(); parser.parse(xmlStream,handler); return handler.getBooks(); } public List<Book> getBooks(){ return books; } @Override public void startDocument() throws SAXException { books = new ArrayList<Book>(); } @Override public void startElement(String uri,String localName,String qName,Attributes attributes) throws SAXException { sb.delete(0,sb.length());  //清除字符内容
        if("book".equals(qName)){ book = new Book(); book.setId(Integer.parseInt(attributes.getValue(0))); } preTag = qName;//将正在解析的节点名称赋给preTag
 } @Override public void endElement(String uri,String qName) throws SAXException { if("book".equals(qName)){ books.add(book); book = null; } preTag = null;/**当解析结束时置为空。这里很重要，例如，当图中画3的位置结束后，会调用这个方法 ，如果这里不把preTag置为null，根据startElement(....)方法，preTag的值还是book，当文档顺序读到图 中标记4的位置时，会执行characters(char[] ch,int start,int length)这个方法，而characters(....)方 法判断preTag!=null，会执行if判断的代码，这样就会把空值赋值给book，这不是我们想要的。*/ } @Override public void characters(char[] ch,int start,int length) throws SAXException { if(preTag!=null){ // String content = new String(ch,start,length);
            sb.append(ch,length);//字符相加
            String content =sb.toString(); if("name".equals(preTag)){ book.setName(content); }else if("price".equals(preTag)){ book.setPrice(Float.parseFloat(content)); } } } }@H_502_210@

public class Book { private int id; private String name; private float price; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public float getPrice() { return price; } public void setPrice(float price) { this.price = price; } @Override public String toString(){ return this.id+":"+this.name+":"+this.price; } }@H_502_210@

<?xml version="1.0" encoding="UTF-8"?>
<books>
    <book id="12">
        <name>&lt;thing in java ></name>
        <price>45.0</price> 
    </book>
    <book id="15">
        <name>Spring in Action</name>
        <price>39.0</price>
    </book>
</books>@H_502_210@

采用JUNIT4测试

public class Test { @org.junit.Test public void testSAX() throws Throwable{ SaxParseService sax = new SaxParseService(); InputStream input = this.getClass().getClassLoader().getResourceAsStream("book.xml"); List<Book> books = sax.getBooks(input); for(Book book : books){ System.out.println(book.getName()); } }} @H_502_210@

原文链接：https://www.f2er.com/xml/297624.html

SAX解析XML出现特殊字符

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