Android XML解析之Pull

最新推荐文章于 2025-04-15 17:46:12 发布

转载最新推荐文章于 2025-04-15 17:46:12 发布 · 35 阅读

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原文链接：http://www.cnblogs.com/qingblog/archive/2012/09/05/2672143.html

本文介绍了一种使用Pull解析器处理XML文件的方法，并通过一个具体的Android应用实例进行演示。该应用从XML文件中读取人物信息，将其转换为Java Bean对象，并通过单元测试验证解析的正确性。

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转自：http://telecom.chinaitlab.com/ydkf/872500.html

Pull解析XML文档；

首先建一个android项目，在cn.class3g.service里建一个名为person_list,xml：

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<?xml version="1.0" encoding="UTF-8"?>
<persons>
<person id="111">
<name>Tom</name>
<age>20</age>
</person>
<person id="222">
<name>Mary</name>
<age>17</age>
</person>
</persons>

<?xml version="1.0" encoding="UTF-8"?> <persons> <person id="111"> <name>Tom</name> <age>20</age> </person> <person id="222"> <name>Mary</name> <age>17</age> </person> </persons>
在cn.class3g.domain包下封装javabean，person：

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package cn.class3g.domain;
public class Person {
private int id;
private String name;
private int age;
public Person() {
}
public Person(int id, String name, int age) {
super();
this.id = id;
this.name = name;
this.age = age;
}
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 int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String toString() {
return "Person [id=" + id + ", name=" + name + ", age=" + age + "]";
}
}

package cn.class3g.domain; public class Person { private int id; private String name; private int age; public Person() { } public Person(int id, String name, int age) { super(); this.id = id; this.name = name; this.age = age; } 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 int getAge() { return age; } public void setAge(int age) { this.age = age; } public String toString() { return "Person [id=" + id + ", name=" + name + ", age=" + age + "]"; } }
在service包下创建PersonHandler类：

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<pre name="code" class="html">package cn.class3g.service;
import java.io.InputStream;
import java.io.Writer;
import java.util.ArrayList;
import java.util.List;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlSerializer;
import android.util.Xml;
import cn.class3g.domain.Person;
public class PullPersonService {
public static List<Person> getPersonList(InputStream inStream)
throws Exception {
List<Person> personList = null;
//拿到XmlPullParser解析器
XmlPullParser parser = Xml.newPullParser();
//统一编码
parser.setInput(inStream, "utf-8");
int eventType = parser.getEventType();
//创建一个person对象
Person person = null;
//开始解析
while (eventType != XmlPullParser.END_DOCUMENT) {
switch (eventType) {
case XmlPullParser.START_DOCUMENT:
personList = new ArrayList<Person>();
break;
case XmlPullParser.START_TAG:
// 判断当前元素名是否为person
if ("person".equals(parser.getName())) {
person = new Person();
person.setId(Integer.valueOf(parser.getAttributeValue(0)));
} else if ("name".equals(parser.getName())) {
person.setName(parser.nextText());
} else if ("age".equals(parser.getName())) {
person.setAge(Integer.valueOf(parser.nextText()));
}
break;
case XmlPullParser.END_TAG:
if ("person".equals(parser.getName()) && person != null) {
personList.add(person);
person = null;
}
break;
}
// next方法的调用导致下一个节点的解析，同时返回下一个节点解析的事件类型代码
eventType = parser.next();
}
return personList;
}
｝

<pre name="code" class="html">package cn.class3g.service; import java.io.InputStream; import java.io.Writer; import java.util.ArrayList; import java.util.List; import org.xmlpull.v1.XmlPullParser; import org.xmlpull.v1.XmlSerializer; import android.util.Xml; import cn.class3g.domain.Person; public class PullPersonService { public static List<Person> getPersonList(InputStream inStream) throws Exception { List<Person> personList = null; //拿到XmlPullParser解析器 XmlPullParser parser = Xml.newPullParser(); //统一编码 parser.setInput(inStream, "utf-8"); int eventType = parser.getEventType(); //创建一个person对象 Person person = null; //开始解析 while (eventType != XmlPullParser.END_DOCUMENT) { switch (eventType) { case XmlPullParser.START_DOCUMENT: personList = new ArrayList<Person>(); break; case XmlPullParser.START_TAG: // 判断当前元素名是否为person if ("person".equals(parser.getName())) { person = new Person(); person.setId(Integer.valueOf(parser.getAttributeValue(0))); } else if ("name".equals(parser.getName())) { person.setName(parser.nextText()); } else if ("age".equals(parser.getName())) { person.setAge(Integer.valueOf(parser.nextText())); } break; case XmlPullParser.END_TAG: if ("person".equals(parser.getName()) && person != null) { personList.add(person); person = null; } break; } // next方法的调用导致下一个节点的解析，同时返回下一个节点解析的事件类型代码 eventType = parser.next(); } return personList; } ｝

接下来测试，在activity包下创建Test测试类：

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package cn.class3g.activity;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import cn.class3g.domain.Person;
import cn.class3g.service.PullPersonService;
import android.test.AndroidTestCase;
import android.util.Log;
public class Test extends AndroidTestCase {
public void testPull() throws Throwable {
InputStream inStream = this.getClass().getClassLoader()
.getResourceAsStream("person_list.xml");
List<Person> personList = PullPersonService.getPersonList(inStream);
Log.i("TAG", personList.toString());
}
}

package cn.class3g.activity; import java.io.InputStream; import java.util.ArrayList; import java.util.List; import cn.class3g.domain.Person; import cn.class3g.service.PullPersonService; import android.test.AndroidTestCase; import android.util.Log; public class Test extends AndroidTestCase { public void testPull() throws Throwable { InputStream inStream = this.getClass().getClassLoader() .getResourceAsStream("person_list.xml"); List<Person> personList = PullPersonService.getPersonList(inStream); Log.i("TAG", personList.toString()); } }
在测试前在清单中添加测试权限：

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<instrumentation android:name="android.test.InstrumentationTestRunner" android:targetPackage="cn.class3g.activity"></instrumentation>

<instrumentation android:name="android.test.InstrumentationTestRunner" android:targetPackage="cn.class3g.activity"></instrumentation>
利用Android JUnit Test测试：

控制台输出：

另外两篇http://blog.youkuaiyun.com/qeqeqe236/article/details/6990245

http://yangguangfu.iteye.com/blog/832277

测试成功

转载于:https://www.cnblogs.com/qingblog/archive/2012/09/05/2672143.html