android XMl 解析神奇xstream 六： 把集合list 转化为 XML文档

package com.android10;

public class Person {

    String pName ;
    String pAge  ;
    
    public String getpName() {
        return pName;
    }
    public void setpName(String pName) {
        this.pName = pName;
    }
    public String getpAge() {
        return pAge;
    }
    public void setpAge(String pAge) {
        this.pAge = pAge;
    } 
}

package com.android10;

public class Product {

    private String name ;

    private String age  ;

    private Person person ;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAge() {
        return age;
    }

    public void setAge(String age) {
        this.age = age;
    }

    public Person getPerson() {
        return person;
    }

    public void setPerson(Person person) {
        this.person = person;
    }
}

package com.android10;

import java.util.List;

public class ListBean {

    private List<Product> root ;

    public List<Product> getRoot() {
        return root;
    }

    public void setRoot(List<Product> root) {
        this.root = root;
    }

}

package com.android10;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.ArrayList;
import java.util.List;

import javax.xml.transform.OutputKeys;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.sax.SAXSource;
import javax.xml.transform.sax.SAXTransformerFactory;
import javax.xml.transform.stream.StreamResult;

import org.xml.sax.InputSource;

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

import com.thoughtworks.xstream.XStream;
public class MainActivity extends Activity {

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

        XStream xstream = new XStream() ;

        List<Product> root = getList() ;

        //将ListBean中的集合设置空元素，即不显示集合元素标签
        xstream.addImplicitCollection( ListBean.class, "root");

        xstream.autodetectAnnotations(true);
        
        //设置别名
        xstream.alias( "product", Product.class );

        //将name设置为父类（Student）的元素的属性
        xstream.useAttributeFor( Product.class, "name" );

        //把list集合转换成Xml字符串
        String xmlString =  xstream.toXML(  root ) ;

        //把Xml字符串写入SD卡Xml文件
        XstreamUtil xstreamUtil = new XstreamUtil() ;
        xstreamUtil.writeToXml( this ,  xmlString ) ;

        //把Xml字符串转化成list集合
        List<Product> list = new ArrayList<Product>() ;
        list =  (List<Product>) xstream.fromXML( xmlString ) ;

        System.out.println("sss"+  formatXml( xmlString ) );

    }

    /**
     * 得到数据
     * @return
     */
    private List<Product>  getList(){
        Person person1 = new Person() ;
        person1.setpName( "saliy" ) ;
        person1.setpAge( "36" );

        Product product1 = new Product() ;
        product1.setName( "jhon" ) ;
        product1.setAge( "30" );
        product1.setPerson( person1 );

        Person person2 = new Person() ;
        person2.setpName( "saliy02" ) ;
        person2.setpAge( "3602" );

        Product product2 = new Product() ;
        product2.setName( "jhon02" ) ;
        product2.setAge( "3002" );
        product2.setPerson( person2 );

        List<Product> root = new ArrayList<Product>() ;
        root.add( product1 ) ;
        root.add( product2 ) ;

        return root ;
    }

    /**
     * 格式化XML字符串
     * @param xml
     * @return
     */
    public static String formatXml(String xml){
        try{
            Transformer serializer= SAXTransformerFactory.newInstance().newTransformer();
            serializer.setOutputProperty(OutputKeys.INDENT, "yes");
            serializer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");
            Source xmlSource=new SAXSource(new InputSource(new ByteArrayInputStream(xml.getBytes())));
            StreamResult res =  new StreamResult(new ByteArrayOutputStream());            
            serializer.transform(xmlSource, res);
            return new String(((ByteArrayOutputStream)res.getOutputStream()).toByteArray());
        }catch(Exception e){         
            return xml;
        }
    }
}

package com.android10;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;

import android.content.Context;
import android.os.Environment;

public class XstreamUtil {

    XcallBack xcallBack ;

    /**
     * 把xml字符串写入ＳＤ卡文件
     * @param context
     * @param str　　xml字符串
     */
    public void writeToXml(Context context, String str ){  

        //获取文件路径
        String SDPATH = Environment.getExternalStorageDirectory()  + "/myfile1.xml/" ;

        //创建文件
        File file = new File( SDPATH ) ;
        if( !file.exists() ){
            try {
                file.createNewFile() ;
            } catch (IOException e) {
                e.printStackTrace();
            } 
        }

        //写入数据
        try {
            FileOutputStream out = new FileOutputStream( file ) ;
            OutputStreamWriter outw = new OutputStreamWriter(out);  
            try {  
                outw.write(str);  
                outw.close();  
                out.close();  
                if( xcallBack != null ){
                    xcallBack.success(); 
                }
            } catch (IOException e) { 
                if( xcallBack != null ){
                    xcallBack.fail(); 
                }
            }  
        } catch (FileNotFoundException e1) {
            e1.printStackTrace();
            if( xcallBack != null ){
                xcallBack.fail(); 
            }
        }
    } 

    //设置监听器
    void setXStreamLister( XcallBack xcallBack ){
        this.xcallBack = xcallBack ;
    }

}

interface XcallBack{
    /**
     * 写入成功
     */
    void success() ;  

    /**
     * 写入失败
     */
    void fail() ;     
}