记录读取XML文件方式二
记录：使用SAX方式读取，在速度上要优于DOM
1 public class SchoolSax extends DefaultHandler { 2 /** 3 * 接收XML中所有有用的数据 4 */ 5 private List<School> schoolList; 6 /** 7 * 临时变量 8 */ 9 private School school; 10 private SClass sClass; 11 private Student student; 12 13 public List<School> getSchoolList() { 14 return schoolList; 15 } 16 17 18 /** 19 * 文档接受文档开始的通知--此事件用于对象的初始化 20 */ 21 @Override 22 public void startDocument() throws SAXException { 23 schoolList = new ArrayList<School>(); 24 25 } 26 27 /** 28 * 文档接受结束 29 */ 30 @Override 31 public void endDocument() throws SAXException { 32 33 } 34 35 @Override 36 public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException { 37 if (qName.equals(SchoolTag.SCHOOL)) { 38 String schoolId = attributes.getValue(SchoolTag.ID); 39 String schoolName = attributes.getValue(SchoolTag.NAME); 40 school = new School(schoolId, schoolName); 41 } else if (qName.equals(SchoolTag.CLASS)) { 42 String sClassId = attributes.getValue(SchoolTag.ID); 43 String sClassName = attributes.getValue(SchoolTag.NAME); 44 sClass = new SClass(sClassId, sClassName, school); 45 } else if (qName.equals(SchoolTag.STUDENT)) { 46 String studentId = attributes.getValue(SchoolTag.ID); 47 String studentName = attributes.getValue(SchoolTag.NAME); 48 student = new Student(studentId, studentName, sClass); 49 } else { 50 System.out.println("其他的Tag：" + qName); 51 } 52 } 53 54 @Override 55 public void endElement(String uri, String localName, String qName) throws SAXException { 56 if (qName.equals(SchoolTag.SCHOOL)) { 57 this.schoolList.add(school); 58 } else if (qName.equals(SchoolTag.CLASS)) { 59 this.school.getsClassList().add(sClass); 60 } else if (qName.equals(SchoolTag.STUDENT)) { 61 this.sClass.getStudents().add(student); 62 } 63 } 64 65 @Override 66 public void characters(char[] ch, int start, int length) throws SAXException { 67 68 } 69 }
Test：
1 public class TestSax { 2 3 public static void test(File file) throws Exception { 4 SAXParserFactory factory = SAXParserFactory.newInstance(); 5 try { 6 SAXParser saxParser = factory.newSAXParser(); 7 SchoolSax sax = new SchoolSax(); 8 //事件注册（允许多个接受者） 9 saxParser.parse(file, sax); 10 List<School> schoolList = sax.getSchoolList(); 11 for (School sch : schoolList) { 12 System.out.println(sch.getId() + "--" + sch.getName()); 13 List<SClass> classList = sch.getsClassList(); 14 for (SClass sclass : classList) { 15 System.out.println(sclass.getId() + "--" + sclass.getName()); 16 List<Student> studentList = sclass.getStudents(); 17 for (Student stu : studentList) { 18 System.out.println(stu.getId() + "--" + stu.getName()); 19 } 20 } 21 } 22 } catch (Exception e) { 23 e.printStackTrace(); 24 } 25 } 26 27 28 public static void main(String[] args) { 29 try { 30 String path = TestSax.class.getResource("/").toURI().getPath(); 31 String pathFileName = path + "\\School.xml"; 32 TestSax.test(new File(pathFileName)); 33 } catch (Exception e) { 34 e.printStackTrace(); 35 } 36 } 37 }
同DOM相比，处理同一个XML文档，SAX用时：1s 459ms，DOM用时：4s 621ms
