android network develop(3)----Xml Parser

Normally, there are three type parser in android. Xmlpullparser, DOM & SAX.

Google recomand Xmlpullparser to doing this.

But to parser xml files or inputstream, it based on xml content.

So using an general way to parser xml.

BaseXmlObj:

/***********************************************************

 *@description : This class function is TODO 

 *

 * @create author : deman.lu

 * @create date   :2015-07-15

 * @modify author :

 * @modify date   :

 * @contact: joyfulmath.china@gmail.com

 *

 **********************************************************/
package com.joyfulmath.androidstudy.connect.xmlparser;

import java.lang.reflect.Field;

public abstract class BaseXmlObj {
    public abstract String[] getNodes();

    public void setParamater(String tag, Object value) {

        try {

            Field field = getClass().getField(tag);

            field.setAccessible(true);

            field.set(this, value);

        } catch (SecurityException e) {

            e.printStackTrace();

        } catch (NoSuchFieldException e) {

            e.printStackTrace();

        } catch (IllegalArgumentException e) {

            e.printStackTrace();

        } catch (IllegalAccessException e) {

            e.printStackTrace();

        }

    }
}

/***********************************************************

 *@description : This class function is TODO 

 *

 * @create author : deman.lu

 * @create date   :2015-07-15

 * @modify author :

 * @modify date   :

 * @contact: joyfulmath.china@gmail.com

 *

 **********************************************************/

package com.joyfulmath.androidstudy.connect.xmlparser;

import java.io.InputStream;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;

import android.content.res.XmlResourceParser;

public class XmlParserUtils {

    private static String encode = "utf-8";
    public static XmlPullParser pullParser;
    static {

        try {
            pullParser = XmlPullParserFactory.newInstance().newPullParser();
        } catch (XmlPullParserException e) {
            e.printStackTrace();
        }
    }

    /**
     *
     * @description :解析节点中的内容，封装成对象模型。
     *
     * @author : deman.lu
     *
     * @create :2015-07-15
     *
     * @param in    network data contains xml
     *
     * @param obj
     *
     * @throws Exception
     *
     * @return :T extends BaseXmlObj
     */
    public static <T extends BaseXmlObj> void streamText2Model(InputStream in,
            T obj) throws Exception {

        pullParser.setInput(in, encode);
        int eventType = pullParser.getEventType();
        String[] nodes = obj.getNodes();
        String nodeName = null;
        boolean success = true;

        while (eventType != XmlPullParser.END_DOCUMENT && success) {

            switch (eventType) {
            case XmlPullParser.START_DOCUMENT:
                break;

            case XmlPullParser.START_TAG:
                nodeName = pullParser.getName();
                break;

            case XmlPullParser.TEXT:
                for (int i = 0; i < nodes.length; i++) {
                    if (nodes[i].equals(nodeName)) {
                        obj.setParamater(nodeName, pullParser.getText());
                    }
                }
                break;

            case XmlPullParser.END_TAG:
                break;
            }

            eventType = pullParser.next();
        }
    }

    /**
     *
     * @description :解析节点中的内容，封装成对象模型。
     *
     * @author : deman.lu
     *
     * @create :2015-07-15
     *
     * @param resParser        XmlResourceParser read form resource
     *
     * @param obj
     *
     * @throws Exception
     *
     * @return :void
     */
    public static <T extends BaseXmlObj> void streamText2Model(XmlResourceParser resParser,
            T obj) throws Exception {

        int eventType = resParser.getEventType();
        String[] nodes = obj.getNodes();
        String nodeName = null;
        boolean success = true;

        while (eventType != XmlPullParser.END_DOCUMENT && success) {

            switch (eventType) {
            case XmlPullParser.START_DOCUMENT:
                break;

            case XmlPullParser.START_TAG:
                nodeName = resParser.getName();
                break;

            case XmlPullParser.TEXT:
                for (int i = 0; i < nodes.length; i++) {
                    if (nodes[i].equals(nodeName)) {
                        obj.setParamater(nodeName, resParser.getText());
                    }
                }
                break;

            case XmlPullParser.END_TAG:
                break;
            }

            eventType = resParser.next();
        }
    }

}

we using reflect, but if xml is complex, the efficiency may be low.

The way should be decided.

package com.joyfulmath.androidstudy.connect;

import java.io.Serializable;

import com.joyfulmath.androidstudy.connect.xmlparser.BaseXmlObj;

public class Student extends BaseXmlObj implements Serializable {

    /**
     *
     */
    private static final long serialVersionUID = 1L;

    public String GradeID, GradeName, ClassID, ClassName, UserID, UserName;

    public Student() {
    }

    @Override
    public String[] getNodes() {
        return new String[] { "GradeID", "GradeName", "ClassID", "ClassName", "UserID", "UserName" };
    }

    @Override
    public String toString() {
        String su = "@student:"+"GradeID:"+GradeID
                +"GradeName:"+GradeName
                +"ClassID:"+ClassID
                +"ClassName:"+ClassName
                +"UserID:"+UserID
                +"UserName:"+UserName;
        return NetWorkUtils.replaceBlank(su);
    }

}

package com.joyfulmath.androidstudy.connect;

import com.joyfulmath.androidstudy.connect.xmlparser.XmlParserUtils;

import android.content.Context;
import android.content.res.XmlResourceParser;

public class XmlParserDemo {

    public static Student parserStudentXml(Context context,int resId)
    {
        try {
            Student student = new Student();
            XmlResourceParser xml = context.getResources()
                    .getXml(resId);
            XmlParserUtils.streamText2Model(xml, student);
            xml.close();
            return student;
        } catch (Exception e) {
            e.printStackTrace();
        }

        return null;

    }
}

<?xml version="1.0" encoding="UTF-8"?>
<DsXml>

    <IsLog>
true

    </IsLog>

    <GradeID>
10001

    </GradeID>

    <GradeName>
高一年级

    </GradeName>

    <ClassID>
10010

    </ClassID>

    <ClassName>
高一(01)班

    </ClassName>

    <UserID>
10000

    </UserID>

    <UserName>
张三

    </UserName>

</DsXml>

转载：http://www.cnblogs.com/vanezkw/archive/2013/03/03/2941496.html