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

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 二: 把对象转换成xml

android XMl 解析神奇xstream 三: 把复杂对象转换成 xml

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

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

1、创建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() ; //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() ;
}

3、运行结果

<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>

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