android XMl 解析神奇xstream 六： 把集合list 轉化為 XML文檔，androidxstream

android XMl 解析神奇xstream 六： 把集合list 轉化為 XML文檔，androidxstream

前言：對xstream不理解的請看：

android XMl 解析神奇xstream 一： 解析android項目中 asset 檔案夾 下的 aa.xml 檔案

android XMl 解析神奇xstream 二： 把對象轉換成xml

android XMl 解析神奇xstream 三： 把複雜物件轉換成 xml

android XMl 解析神奇xstream 四： 將複雜的xml檔案解析為對象

android XMl 解析神奇xstream 五： 把複雜物件轉換成 xml ,並寫入SD卡中的xml檔案

 

1、建立JavaBeen

 

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;    }}

2、主要方法

 

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() ;        //將ListBean中的集合設定空元素，即不顯示集合元素標籤        xstream.addImplicitCollection( ListBean.class, "root");        xstream.autodetectAnnotations(true);                //設定別名        xstream.alias( "product", Product.class );        //將name設定為父類（Student）的元素的屬性        xstream.useAttributeFor( Product.class, "name" );        //把list集合轉換成Xml字串        String xmlString =  xstream.toXML(  root ) ;        //把Xml字串寫入SD卡Xml檔案        XstreamUtil xstreamUtil = new XstreamUtil() ;        xstreamUtil.writeToXml( this ,  xmlString ) ;        //把Xml字串轉化成list集合        List<Product> list = new ArrayList<Product>() ;        list =  (List<Product>) xstream.fromXML( xmlString ) ;        System.out.println("sss"+  formatXml( xmlString ) );    }    /**     * 得到資料     * @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字串寫入ＳＤ卡檔案     * @param context     * @param str　　xml字串     */    public void writeToXml(Context context, String str ){          //擷取檔案路徑        String SDPATH = Environment.getExternalStorageDirectory()  + "/myfile1.xml/" ;        //建立檔案        File file = new File( SDPATH ) ;        if( !file.exists() ){            try {                file.createNewFile() ;            } catch (IOException e) {                e.printStackTrace();            }         }        //寫入資料        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();             }        }    }     //設定監聽器    void setXStreamLister( XcallBack xcallBack ){        this.xcallBack = xcallBack ;    }}interface XcallBack{    /**     * 寫入成功     */    void success() ;      /**     * 寫入失敗     */    void fail() ;     }

 

3、運行結果

<list>
  <product name="jhon">
    <age>30</age>
    <person>
      <pAge>36</pAge>
      <pName>saliy</pName>
    </person>
  </product>
  <product name="jhon02">
    <age>3002</age>
    <person>
      <pAge>3602</pAge>
      <pName>saliy02</pName>
    </person>
  </product>
</list>