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android XMl 解析神奇xstream 五：把复杂对象转换成 xml ,并写入SD卡中的xml文件

日期：2017-05-15点击：482收藏

前言：对xstream不理解的请看：

android XMl 解析神奇xstream 一：解析android项目中 asset 文件夹下的 aa.xml 文件

android XMl 解析神奇xstream 四：将复杂的xml文件解析为对象

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;
    }
}

2、工具类代码

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();  
                xcallBack.success(); 
            } catch (IOException e) {  
                xcallBack.fail(); 
            }  
        } catch (FileNotFoundException e1) {
            e1.printStackTrace();
            xcallBack.fail(); 
        }
    } 


    void setXStreamLister( XcallBack xcallBack ){
        this.xcallBack = xcallBack ;
    }

}

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

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

3、主要方法

package com.android10;
import android.app.Activity;
import android.os.Bundle;
import android.widget.Toast;
import com.thoughtworks.xstream.XStream;
public class MainActivity extends Activity {

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

        Person person = new Person() ;
        person.setpName( "saliy" ) ;
        person.setpAge( "36" );

        Product product = new Product() ;
        product.setName( "jhon" ) ;
        product.setAge( "30" );
        product.setPerson( person );

        //将对象转化为xml字符串
        XStream xstream = new XStream() ;
        //设置别名
        xstream.alias( "blog" , Product.class ) ; 
        String string = xstream.toXML( product ) ;

        XstreamUtil xUtil = new XstreamUtil() ;
        xUtil.setXStreamLister( new XcallBack() {
            @Override
            public void success() {
                Toast.makeText( MainActivity.this , "成功了 ", Toast.LENGTH_SHORT ).show(); 
            }

            @Override
            public void fail() {
                Toast.makeText( MainActivity.this , "失败了 ", Toast.LENGTH_SHORT ).show(); 
            }
        });

        xUtil.writeToXml( this , string );
    }
}