xml文件pull的解析

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  1. //分三部分1是得到实体类.2是得到干活的类personservice.3是在主活动调用干活的类做输出.
  1. package cn.itcast.xml.domain;
  2.  
  3. public class Person {
  4. private int id;
  5. private String name;
  6. private int age;
  7.  
  8. public Person(){
  9. }
  10. public Person(int id,String name,int age) {
  11. this.id = id;
  12. this.name = name;
  13. this.setAge(age);
  14. }
  15.  
  16. public int getId() {
  17. return id;
  18. }
  19.  
  20. public void setId(int id) {
  21. this.id = id;
  22. }
  23.  
  24. public String getName() {
  25. return name;
  26. }
  27.  
  28. public void setName(String name) {
  29. this.name = name;
  30. }
  31.  
  32. public int getAge() {
  33. return age;
  34. }
  35.  
  36. public void setAge(int age) {
  37. if (age > 0 && age < 100) {
  38. this.age = age;
  39. }else{
  40. this.age = 0;
  41. }
  42.  
  43. }
  44.  
  45. }
  1. <pre class="java" name="code">package cn.itcast.xml.service;
  2.  
  3. import java.io.File;
  4. import java.io.FileNotFoundException;
  5. import java.io.FileOutputStream;
  6. import java.io.IOException;
  7. import java.io.InputStream;
  8. import java.util.ArrayList;
  9. import java.util.List;
  10.  
  11. import org.xmlpull.v1.XmlPullParser;
  12. import org.xmlpull.v1.XmlSerializer;
  13.  
  14. import android.content.Context;
  15. import android.content.res.AssetManager;
  16. import android.os.Environment;
  17. import android.util.Xml;
  18. import android.widget.Toast;
  19.  
  20. import cn.itcast.xml.domain.Person;
  21.  
  22. public class PersonService {
  23. private Context context;
  24. public PersonService(Context context) {
  25. this.context = context;
  26. }
  27.  
  28. /**
  29. * 把person.xml的输入流 解析 转化成list集合
  30. * @param filename assets目录下的文件
  31. * @return
  32. */
  33. public List<Person> getPersons(String filename){
  34. AssetManager manager = context.getAssets();
  35. try {
  36. InputStream is = manager.open(filename);
  37. //在android下使用pull解析xml文件
  38. //1.获取pull解析器的实例
  39. XmlPullParser parser = Xml.newPullParser();
  40. //2.设置解析器的一些参数
  41. parser.setInput(is,"utf-8");
  42. // 获取pull解析器对应的事件类型
  43. int type = parser.getEventType();
  44. Person person = null;
  45. List<Person> persons = new ArrayList<Person>();
  46. while(type!=XmlPullParser.END_DOCUMENT){
  47. if(type==XmlPullParser.START_TAG){
  48. if("person".equals(parser.getName())){
  49. person = new Person();
  50. int id =Integer.parseInt( parser.getAttributeValue(0));
  51. person.setId(id);
  52. }else if("name".equals(parser.getName())){
  53. String name = parser.nextText();
  54. person.setName(name);
  55. }else if("age".equals(parser.getName())){
  56. int age = Integer.parseInt( parser.nextText());
  57. person.setAge(age);
  58. }
  59. }
  60. if(type==XmlPullParser.END_TAG){
  61. if("person".equals(parser.getName())){
  62. persons.add(person);
  63. person = null;
  64. }
  65. }
  66. type = parser.next();
  67. }
  68. return persons;
  69. } catch (Exception e) {
  70. e.printStackTrace();
  71. Toast.makeText(context,"获取person.xml失败",Toast.LENGTH_SHORT).show();
  72. return null;
  73. }
  74. }
  75. /**
  76. * 把persons集合里面的内容写到xml文件里面
  77. * @param persons person的集合
  78. * @return
  79. */
  80. public boolean savePersonToXml(List<Person> persons){
  81. try {
  82. XmlSerializer serializer = Xml.newSerializer();
  83. // /sdcard/person.xml
  84. // mount unmount 文件系统的权限
  85. File file = new File(Environment.getExternalStorageDirectory(),"person.xml");
  86. FileOutputStream fos = new FileOutputStream(file);
  87. serializer.setOutput(fos,"utf-8");
  88. serializer.startDocument("utf-8",true);
  89. serializer.startTag(null,"persons");
  90. for(Person person:persons){
  91. serializer.startTag(null,"person");
  92. serializer.attribute(null,"id",person.getId()+"");
  93. serializer.startTag(null,"name");
  94. serializer.text(person.getName());
  95. serializer.endTag(null,"name");
  96. serializer.startTag(null,"age");
  97. serializer.text(person.getAge()+"");
  98. serializer.endTag(null,"age");
  99. serializer.endTag(null,"person");
  100. }
  101. serializer.endTag(null,"persons");
  102. serializer.endDocument();
  103. fos.flush();
  104. fos.close();
  105. return true;
  106. } catch (Exception e) {
  107. e.printStackTrace();
  108. return false;
  109. }
  110.  
  111. }
  112. }
  1. <pre class="java" name="code">package cn.itcast.xml;
  2.  
  3. import java.util.List;
  4.  
  5. import cn.itcast.xml.domain.Person;
  6. import cn.itcast.xml.service.PersonService;
  7. import android.app.Activity;
  8. import android.os.Bundle;
  9. import android.widget.TextView;
  10.  
  11. public class MainActivity extends Activity {
  12. /** Called when the activity is first created. */
  13. @Override
  14. public void onCreate(Bundle savedInstanceState) {
  15. super.onCreate(savedInstanceState);
  16. setContentView(R.layout.main);
  17. TextView tv = (TextView) this.findViewById(R.id.tv);
  18. PersonService service = new PersonService(this);
  19. List<Person> persons = service.getPersons("person.xml");
  20. StringBuffer sb = new StringBuffer();
  21. for(Person person : persons){
  22. String age = "年龄"+ person.getAge();
  23. String name =person.getName();
  24. String id = "id="+ person.getId();
  25. sb.append(name +" "+ age+" "+id);
  26. }
  27. tv.setText( sb.toString());
  28. }
  29. }
  1. package cn.itcast.xml.test;
  2.  
  3. import java.util.ArrayList;
  4. import java.util.List;
  5.  
  6. import cn.itcast.xml.domain.Person;
  7. import cn.itcast.xml.service.PersonService;
  8. import android.test.AndroidTestCase;
  9. import android.util.Log;
  10.  
  11. public class TestPersonService extends AndroidTestCase {
  12. private static final String TAG = "TestPersonService";
  13.  
  14. public void testGetPersons() throws Exception{
  15. PersonService service = new PersonService(getContext());
  16. List<Person> persons = service.getPersons("person.xml");
  17. assertEquals(2,persons.size());
  18. Log.i(TAG,persons.get(0).getName());
  19. }
  20. public void testSavePersons() throws Exception{
  21. PersonService service = new PersonService(getContext());
  22. List<Person> persons = new ArrayList<Person>();
  23. Person p1 = new Person(21,"张三",18);
  24. Person p2 = new Person(27,"李四",29);
  25. Person p3 = new Person(29,"wangwu",-3);
  26. persons.add(p1);
  27. persons.add(p2);
  28. persons.add(p3);
  29. assertEquals(true,service.savePersonToXml(persons)) ;
  30. }
  31. }

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