XML解析之PULL
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在android中极力推荐的xmlpull方式解析xml。
为什么 STAX 解析方式 效率 好于 SAX ?
1、SAX 无选择性的,所有事件都会处理 解析方式,Stax 由用户控制需要处理事件类型
2、在使用Stax进行数据解析时,随时终止解析
环境:
xmlpull_1_1_3_4c.jar
http://www.xmlpull.org/ xmlpull
XML文件:
<?xml version="1.0" encoding="UTF-8"?><root> <student id="1" group="1"> <name>张三</name> <sex>男</sex> <age>18</age> <email>[email protected]</email> <birthday>1987-06-08</birthday> <memo>好学生</memo> </student> <student id="2" group="2"> <name>李四</name> <sex>女</sex> <age>18</age> <email>[email protected]</email> <birthday>1987-06-08</birthday> <memo>好学生</memo> </student> <student id="3" group="3"> <name>小王</name> <sex>男</sex> <age>18</age> <email>[email protected]</email> <birthday>1987-06-08</birthday> <memo>好学生</memo> </student> <student id="4" group="4"> <name>小张</name> <sex>男</sex> <age>18</age> <email>[email protected]</email> <birthday>1987-06-08</birthday> <memo>好学生</memo> </student> <student id="5" group="5"> <name>小明</name> <sex>男</sex> <age>18</age> <email>[email protected]</email> <birthday>1987-06-08</birthday> <memo>好学生</memo> </student></root>
XML对应的实体文件:
public class Student { private int id; private int group; private String name; private String sex; private int age; private String email; private String memo; private String birthday; public int getId() { return id; } public void setId(int id) { this.id = id; } public int getGroup() { return group; } public void setGroup(int group) { this.group = group; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getSex() { return sex; } public void setSex(String sex) { this.sex = sex; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } public String getMemo() { return memo; } public void setMemo(String memo) { this.memo = memo; } public String getBirthday() { return birthday; } public void setBirthday(String birthday) { this.birthday = birthday; } }
Pull解析代码
public class PullParseXml { public List<Student> PullParseXML(){ List<Student> list=null; Student student = null; //构建XmlPullParserFactory try { XmlPullParserFactory pullParserFactory=XmlPullParserFactory.newInstance(); //获取XmlPullParser的实例 XmlPullParser xmlPullParser=pullParserFactory.newPullParser(); //设置输入流 xml文件 xmlPullParser.setInput(Thread.currentThread().getContextClassLoader().getResourceAsStream("Student.xml"), "UTF-8"); //开始 int eventType=xmlPullParser.getEventType(); try { while(eventType!=XmlPullParser.END_DOCUMENT){ String nodeName=xmlPullParser.getName(); switch (eventType) { //文档开始 case XmlPullParser.START_DOCUMENT: list=new ArrayList<Student>(); break; //开始节点 case XmlPullParser.START_TAG: //判断如果其实节点为student if("student".equals(nodeName)){ //实例化student对象 student=new Student(); //设置Id属性 student.setId(Integer.parseInt(xmlPullParser.getAttributeValue(0))); //设置Group属性 student.setGroup(Integer.parseInt(xmlPullParser.getAttributeValue(1))); }else if("name".equals(nodeName)){ //设置name student.setName(xmlPullParser.nextText()); }else if("sex".equals(nodeName)){ //设置sex student.setSex(xmlPullParser.nextText()); }else if("age".equals(nodeName)){ //设置age student.setAge(Integer.parseInt(xmlPullParser.nextText())); }else if("email".equals(nodeName)){ //设置email student.setEmail(xmlPullParser.nextText()); }else if("birthday".equals(nodeName)){ //设置birthday student.setBirthday(xmlPullParser.nextText()); }else if("memo".equals(nodeName)){ //设置memo属性 student.setMemo(xmlPullParser.nextText()); } break; //结束节点 case XmlPullParser.END_TAG: if("student".equals(nodeName)){ list.add(student); student=null; } break; default: break; } eventType=xmlPullParser.next(); } } catch (NumberFormatException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } catch (XmlPullParserException e) { e.printStackTrace(); } return list; } public static void main(String[] args) { List<Student> list=new PullParseXml().PullParseXML(); for(Student student:list){ System.out.println("id:"+student.getId()+"\tgroup:"+student.getGroup()+"\tname:"+student.getName()+"\tsex:"+student.getSex()+"\tage:"+student.getAge()+"\temail:"+student.getEmail()+"\tbirthday:"+student.getBirthday()+"\tmemo:"+student.getMemo()); } } }
Event_Type事件返回的事件代码:
public static final java.lang.String NO_NAMESPACE = ""; public static final int START_DOCUMENT = 0; public static final int END_DOCUMENT = 1; public static final int START_TAG = 2; public static final int END_TAG = 3; public static final int TEXT = 4; public static final int CDSECT = 5; public static final int ENTITY_REF = 6; public static final int IGNORABLE_WHITESPACE = 7; public static final int PROCESSING_INSTRUCTION = 8; public static final int COMMENT = 9; public static final int DOCDECL = 10;
对XML数据通过PULL解析器进行CURD示意图:
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