android SAX 解析 xml文档

res/layout/main014.xm

View Code

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <TextView android:text="用户Id" android:layout_width="wrap_content"
        android:layout_height="wrap_content"></TextView>
    <EditText android:text="" android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:id="@+id/userid"
        android:singleLine="true"></EditText>
    <TextView android:text="用户名" android:layout_width="wrap_content"
        android:layout_height="wrap_content"></TextView>
    <EditText android:text="" android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:id="@+id/username"
        android:singleLine="true"></EditText>
    <TextView android:text="用户密码" android:layout_width="wrap_content"
        android:layout_height="wrap_content"></TextView>
    <EditText android:text="" android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:id="@+id/password"
        android:singleLine="true"></EditText>
    <TextView android:text="用户信息" android:layout_width="wrap_content"
        android:layout_height="wrap_content"></TextView>
    <EditText android:text="" android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:id="@+id/info"
        android:singleLine="true"></EditText>
    <Button android:text="To XML" android:id="@+id/toXml"
        android:layout_width="fill_parent" android:layout_height="wrap_content"></Button>
    <Button android:text="Read XML" android:id="@+id/readXml"
        android:layout_width="fill_parent" android:layout_height="wrap_content"></Button>


</LinearLayout>

res/layout/read.xml

View Code

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent" android:layout_height="wrap_content"
    android:orientation="vertical">
    <LinearLayout android:layout_width="fill_parent"
        android:layout_height="fill_parent">
        <TextView android:text="用户id:\n" android:layout_width="wrap_content"
            android:layout_height="wrap_content"></TextView>
        <TextView android:text="" android:id="@+id/r_userid"
            android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView>
    </LinearLayout>

    <LinearLayout android:layout_width="fill_parent"
        android:layout_height="fill_parent">
        <TextView android:text="用户名:\n" android:id="@+id/textView1"
            android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView>
        <TextView android:text="" android:id="@+id/r_username"
            android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView>
    </LinearLayout>

    <LinearLayout android:layout_width="fill_parent"
        android:layout_height="fill_parent">
        <TextView android:text="用户密码:\n" android:id="@+id/textView1"
            android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView>
        <TextView android:text="" android:id="@+id/r_password"
            android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView>
    </LinearLayout>

    <LinearLayout android:layout_width="fill_parent"
        android:layout_height="fill_parent">
        <TextView android:text="用户信息:\n" android:id="@+id/textView1"
            android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView>
        <TextView android:text="" android:id="@+id/r_info"
            android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView>
    </LinearLayout>
</LinearLayout>

src/B.Unit/User.java

View Code

package B.Unit;

public class User {
    private int userId;
    private String userName;
    private String password;
    private String info;

    public int getUserId() {
        return userId;
    }

    public void setUserId(int userId) {
        this.userId = userId;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getInfo() {
        return info;
    }

    public void setInfo(String info) {
        this.info = info;
    }

}

src/B.Unit/SaxDoc.java

package B.Unit;

import java.util.ArrayList;
import java.util.List;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

/**
 * 实现丢xml文件解析，返回一个list对象
 * 
 * */

public class SaxDoc extends DefaultHandler {
    private List<User> list = null;
    private User user = null;
    private String tagname;

    /**
     * 开始解析xml文档
     * */
    @Override
    public void startDocument() throws SAXException {
        System.out.println("startDocument");
        list = new ArrayList<User>();
        super.startDocument();
    }

    StringBuffer sb = new StringBuffer();
    /**
     * 开始处理节点，获得节点的属性
     * */
    @Override
    public void startElement(String uri, String localName, String qName,
            Attributes attributes) throws SAXException {
        sb.delete(0, sb.length());
        if (localName.equals("user")) {
            user = new User();
            user.setUserId(Integer.parseInt(attributes.getValue("id")));
        }
        this.tagname = localName;
        super.startElement(uri, localName, qName, attributes);
    }

    /**
     * 获取节点内容
     * */
    @Override
    public void characters(char[] ch, int start, int length)
            throws SAXException {

        if (this.tagname != "") {
            if (this.tagname.equals("name")) {
                sb.append(ch, start, length);
                user.setUserName(sb.toString());
            } else if (this.tagname.equals("pwd")) {
                sb.append(ch, start, length);
                user.setPassword(sb.toString());
            } else if (this.tagname.equals("info")) {
                sb.append(ch, start, length);
                user.setInfo(sb.toString());
            }
        }
        super.characters(ch, start, length);
    }

    @Override
    public void endElement(String uri, String localName, String qName)
            throws SAXException {
        // 一个元素结束后往list里加入一个user对象
        if (localName.equals("user")) {
            list.add(user);
        }
        super.endElement(uri, localName, qName);
    }

    @Override
    public void endDocument() throws SAXException {
        super.endDocument();
    }

    // 返回user list对象
    public List<User> getUserList() {
        return list;
    }
}

src/B.Unit/SaxWriteXml.java

package B.Unit;

import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.StringWriter;
import java.util.List;

import org.xmlpull.v1.XmlSerializer;

import android.os.Environment;
import android.util.Xml;

public class SaxWriteXml {

    public String writeUserInfoToString(List<User> users) {

        // 实现xml信息序列化的一个对象
        XmlSerializer serializer = Xml.newSerializer();
        StringWriter writer = new StringWriter();
        try {
            // xml数据经过序列化后保存到String中，然后将字符串通过OutputStream保存为xml文件
            serializer.setOutput(writer);
            // 文档开始
            serializer.startDocument("utf-8", true);
            // 开始一个节点
            serializer.startTag("", "users");
            // 开始一个子节点
            for (User user : users) {
                serializer.startTag("", "user");
                serializer
                        .attribute("", "id", String.valueOf(user.getUserId()));

                serializer.startTag("", "name");
                serializer.text(user.getUserName());
                serializer.endTag("", "name");

                serializer.startTag("", "pwd");
                serializer.text(user.getPassword());
                serializer.endTag("", "pwd");

                serializer.startTag("", "info");
                serializer.text(String.valueOf(user.getInfo()));
                serializer.endTag("", "info");

                serializer.endTag("", "user");
            }
            serializer.endTag("", "users");

            // 关闭文档
            serializer.endDocument();

        } catch (Exception e) {
            e.printStackTrace();
        }

        return writer.toString();
    }

    public boolean writeToXml( String str,String filePat) {
        System.out.println("run==>writeToXml");
        OutputStream out = null;
        try {
            String dirPath = Environment.getExternalStorageDirectory()
                    .toString() + "/xml";
            File dir = new File(dirPath);
            if (!dir.exists())
                dir.mkdir();
            File f = new File(dirPath +"/"+ filePat);
            System.out.println(dirPath +"/"+ filePat);            
            out = new FileOutputStream(f);

        } catch (Exception e) {
            System.out.println("Error"+e.getMessage());
            return false;
        }
        OutputStreamWriter outw = new OutputStreamWriter(out);
        try {
            outw.write(str);
            outw.close();
            out.close();
        } catch (Exception e) {
            return false;
        }
        return true;
    }
}

src/B.Unit/Activity014.java

package B.P1;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.xml.parsers.FactoryConfigurationError;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.SAXException;

import B.Unit.SaxDoc;
import B.Unit.SaxWriteXml;
import B.Unit.User;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class Activity014 extends Activity {

    private EditText userid, username, password, info;
    private Button toXml, readXml;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main014);

        userid = (EditText) findViewById(R.id.userid);
        username = (EditText) findViewById(R.id.username);
        password = (EditText) findViewById(R.id.password);
        info = (EditText) findViewById(R.id.info);

        toXml = (Button) findViewById(R.id.toXml);
        toXml.setOnClickListener(toXmlClick);

        readXml = (Button) findViewById(R.id.readXml);
        readXml.setOnClickListener(readXmlClick);

    }

    OnClickListener toXmlClick = new OnClickListener() {

        @Override
        public void onClick(View v) {
            System.out.println("toXmlButton  onclick");
            // 用户Id必须填入一个数字否则会出现转换数字异常
            String id = userid.getText().toString();
            String user = username.getText().toString();
            String pwd = password.getText().toString();
            String _info = info.getText().toString();

            User u = new User();

            u.setUserId(new Integer(id));
            u.setUserName(user);
            u.setPassword(pwd);
            u.setInfo(_info);
            // 如果有多个User对象,可以继续添加
            List<User> list = new ArrayList<User>();
            list.add(u);

            SaxWriteXml sax = new SaxWriteXml();
            String strXml = sax.writeUserInfoToString(list);
            System.out.println(strXml);
            sax.writeToXml(strXml, "user.xml");

            Toast.makeText(getApplicationContext(),
                    "write to xml file successful ", Toast.LENGTH_SHORT).show();
        }
    };

    OnClickListener readXmlClick = new OnClickListener() {

        @Override
        public void onClick(View v) {
            System.out.println("readXmlButton  onclick");

            SaxDoc sax = new SaxDoc();

            SAXParser sp = null;
            try {
                sp = SAXParserFactory.newInstance().newSAXParser();
            } catch (ParserConfigurationException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();

            } catch (SAXException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();

            } catch (FactoryConfigurationError e) {
                // TODO Auto-generated catch block

                e.printStackTrace();

            }
            // 解析user.xml文件
            File f = new File(Environment.getExternalStorageDirectory()
                    .toString() + "/xml/user.xml");
            System.out.println(Environment.getExternalStorageDirectory()
                    .toString() + "/xml/user.xml");
            
            if (!f.exists()) {
                Toast.makeText(getApplicationContext(), "not exist user.xml  ",
                        Toast.LENGTH_SHORT).show();
                return;
            }
            try {
                sp.parse(f, sax);
                System.out.println("sp.parse(f, sax);");
            } catch (SAXException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();

            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            // 解析user.xml后,获取返回list的user数据
            List<User> list = sax.getUserList();
            // 目前只有一个User对象
            User user = list.get(0);
            int r_userid = user.getUserId();
            String r_username = user.getUserName();
            String r_password = user.getPassword();
            String r_info = user.getInfo();

            System.out.println("r_userid" + r_userid);
            System.out.println("r_username" + r_username);
            System.out.println("r_password" + r_password);
            System.out.println("r_info" + r_info);

            Intent intent = new Intent(Activity014.this, Activity014Read.class);
            Bundle map = new Bundle();
            map.putSerializable("r_userid", r_userid);
            map.putSerializable("r_username", r_username);
            map.putSerializable("r_password", r_password);
            map.putSerializable("r_info", r_info);
            intent.putExtra("user", map);
            startActivity(intent);

        }
    };

}

src/B.Unit/Activity014Read.java

View Code

package B.P1;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class Activity014Read extends Activity {

    private TextView userid, username, password, info;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.read);

        int _userid = this.getIntent().getBundleExtra("user")
                .getInt("r_userid");

        String _username = this.getIntent().getBundleExtra("user")
                .getString("r_username");

        String _password = this.getIntent().getBundleExtra("user")
                .getString("r_password");

        String _info = this.getIntent().getBundleExtra("user")
                .getString("r_info");

        userid = (TextView) findViewById(R.id.r_userid);
        username = (TextView) findViewById(R.id.r_username);
        password = (TextView) findViewById(R.id.r_password);
        info = (TextView) findViewById(R.id.r_info);

        System.out.println("_userid" + _userid);
        System.out.println("_username" + _username);
        System.out.println("_password" + _password);
        System.out.println("_info" + _info);

        userid.setText(String.valueOf(_userid));
        username.setText(_username);
        password.setText(_password);
        info.setText(_info);
    }
}

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