使用PULL解析XML文件

XmlPull和Sax类似，是基于流（stream）操作文件，然后根据节点事件回调开发者编写的处理程序。因为是基于流的处理，因此Xmlpull和 Sax都比较节约内存资源，不会象Dom那样要把所有节点以对橡树的形式展现在内存中。 但Xmlpull比Sax更简明，而且不需要扫描完整个流。

下面来看一个pull解析xml的例子：

student.xml:

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publicclassStudent{
2. privateintid;
3. privateintgroup;
4. privateStringname;
5. privateStringsex;
6. privateintage;
7. privateStringemail;
8. privateStringmemo;
9. privateStringbirthday;
10. publicintgetId(){
11. returnid;
12. }
13. publicvoidsetId(intid){
14. this.id=id;
15. }
16. publicintgetGroup(){
17. returngroup;
18. publicvoidsetGroup(intgroup){
19. this.group=group;
20. publicStringgetName(){
21. returnname;
22. publicvoidsetName(Stringname){
23. this.name=name;
24. publicStringgetSex(){
25. returnsex;
26. publicvoidsetSex(Stringsex){
27. this.sex=sex;
28. publicintgetAge(){
29. returnage;
30. publicvoidsetAge(intage){
31. this.age=age;
32. publicStringgetEmail(){
33. returnemail;
34. publicvoidsetEmail(Stringemail){
35. this.email=email;
36. publicStringgetMemo(){
37. returnmemo;
38. publicvoidsetMemo(Stringmemo){
39. this.memo=memo;
40. publicStringgetBirthday(){
41. returnbirthday;
42. publicvoidsetBirthday(Stringbirthday){
43. this.birthday=birthday;
45. }

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importjava.io.InputStream;
1. importjava.util.ArrayList;
2. importjava.util.List;
3. importorg.xmlpull.v1.XmlPullParser;
4. importorg.xmlpull.v1.XmlPullParserFactory;
5. importandroid.app.Activity;
6. importandroid.os.Bundle;
7. importandroid.os.Handler;
8. importandroid.os.Message;
9. importandroid.view.ViewGroup.LayoutParams;
10. importandroid.widget.LinearLayout;
11. importandroid.widget.TextView;
12. publicclassPullActivityextendsActivityimplementsRunnable{
13. privateTextViewpullTextView;
14. privateLinearLayoutlayout;
15. privateHandlerhandler=newHandler(){
16. publicvoidhandleMessage(android.os.Messagemsg){
17. ListStudent>lists=(List>)msg.obj;
18. for(inti=0;ilists.size();i++){
19. Studentstudent=lists.get(i);
20. StringBuffersb=newStringBuffer();
21. sb.append(student.getId()+"").append(student.getName()+"")
22. .append(student.getAge()+"").append(student.getSex()+"").append(student.getBirthday()+"")
23. .append(student.getEmail()+"").append(student.getGroup()+"");
24. TextViewtxt=newTextView(getApplicationContext());
25. txt.setLayoutParams(newLayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));
26. txt.setText(sb.toString());
27. layout.addView(txt);
28. };
29. };
30. @Override
31. protectedvoidonCreate(BundlesavedInstanceState){
32. //TODOAuto-generatedmethodstub
33. super.onCreate(savedInstanceState);
34. setContentView(R.layout.pull);
35. pullTextView=(TextView)this.findViewById(R.id.pullTextView);
36. layout=(LinearLayout)this.findViewById(R.id.layout);
37. newThread(this).start();
38. //pull解析xml
39. publicList>pullParseXml(){
40. List>lists=null;
41. Studentstudent=null;
42. try{
43. XmlPullParserFactoryfactory=XmlPullParserFactory.newInstance();
44. //获取XmlPullParser实例
45. XmlPullParserpullParser=factory.newPullParser();
46. InputStreamin=this.getClass().getClassLoader().getResourceAsStream("student.xml");
47. pullParser.setInput(in,"UTF-8");
48. //开始
49. inteventType=pullParser.getEventType();
50. while(eventType!=XmlPullParser.END_DOCUMENT){
51. StringnodeName=pullParser.getName();
52. switch(eventType){
53. //文档开始
54. caseXmlPullParser.START_DOCUMENT:
55. lists=newArrayList>();
56. break;
57. //开始节点
58. caseXmlPullParser.START_TAG:
59. if("student".equals(nodeName)){
60. student=newStudent();
61. student.setId(Integer.parseInt(pullParser.getAttributeValue(0)));
62. student.setGroup(Integer.parseInt(pullParser.getAttributeValue(1)));
63. }elseif("name".equals(nodeName)){
64. student.setName(pullParser.nextText());
65. }elseif("sex".equals(nodeName)){
66. student.setSex(pullParser.nextText());
67. }elseif("age".equals(nodeName)){
68. student.setAge(Integer.parseInt(pullParser.nextText()));
69. }elseif("email".equals(nodeName)){
70. student.setEmail(pullParser.nextText());
71. }elseif("birthday".equals(nodeName)){
72. student.setBirthday(pullParser.nextText());
73. }elseif("memo".equals(nodeName)){
74. student.setMemo(pullParser.nextText());
75. break;
76. //结束节点
77. caseXmlPullParser.END_TAG:
78. lists.add(student);
79. student=null;
80. default:
81. //手动的触发下一个事件
82. eventType=pullParser.next();
83. }catch(Exceptione){
84. //TODOAuto-generatedcatchblock
85. e.printStackTrace();
86. returnlists;
87. @Override
88. publicvoidrun(){
89. //TODOAuto-generatedmethodstub
90. >lists=pullParseXml();
91. Messagemsg=handler.obtainMessage();
92. msg.obj=lists;
93. handler.sendMessage(msg);
94. }

注意xml中的<?xml version="1.0" encoding="utf-8"?> 这句话要顶格显示，不要留空隙，附则错了很难调试的。

解析后效果：

（编辑：李大同）

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