使用XStream, 对于java object与xml之间的转换

   

   因为是测试，所以是先从SD卡读取一个xml文件，转换成对象，再把这个对象生成xml文件，写入SD卡，（若是从服务器获取的，就可以直接使用返回的字符串了）

  另外需要注意的问题就是编码，

 先发测试xml文件。

/sdcard/ceshi2.xml

<?xml version="1.0" encoding="utf-8"?>

<LETTERINFOLIST>
	<ROWS>
		<APPEALBASE>
			<ID>20120726131235</ID>
			<USER_ID>2012072400010</USER_ID>
			<APPEAL_NUM>2012072600007</APPEAL_NUM>
			<APPEAL_RANDOM>7825</APPEAL_RANDOM>
			<CPTYPE>1</CPTYPE>
			<CPNAME>某某公司</CPNAME>
			<APPEAL_THEME>信件主题测试</APPEAL_THEME>
			<APPEAL_CONTONT>来信内容,测试</APPEAL_CONTONT>
			<APPEAL_TRANS_STATE>9</APPEAL_TRANS_STATE>
			<APPEAL_EXTRA>附件1;附件2;附件3</APPEAL_EXTRA>
			<APPEAL_FEEDBACK_INFO>test1</APPEAL_FEEDBACK_INFO>
			<ANNET_WHEN_ENDCASE>test2</ANNET_WHEN_ENDCASE>
		</APPEALBASE>
		<APPEALBASE>
			<ID>20120726132134</ID>
			<USER_ID>2012072400010</USER_ID>
			<APPEAL_NUM>2012072600008</APPEAL_NUM>
			<APPEAL_RANDOM>4453</APPEAL_RANDOM>
			<CPTYPE>1</CPTYPE>
			<CPNAME>某某公司</CPNAME>
			<APPEAL_THEME>信件主题测试</APPEAL_THEME>
			<APPEAL_CONTONT>来信内容,测试</APPEAL_CONTONT>
			<APPEAL_TRANS_STATE>9</APPEAL_TRANS_STATE>
			<APPEAL_EXTRA>附件1;附件2;附件3</APPEAL_EXTRA>
			<APPEAL_FEEDBACK_INFO>test3</APPEAL_FEEDBACK_INFO>
			<ANNET_WHEN_ENDCASE>test4</ANNET_WHEN_ENDCASE>
		</APPEALBASE>
	</ROWS>
</LETTERINFOLIST>

下面是对应的对象

LetterInfoList.java 

package com.zeng.xstream.model;

import com.thoughtworks.xstream.annotations.XStreamAlias;

@XStreamAlias("LETTERINFOLIST")
public class LetterInfoList {
	
	
	@XStreamAlias("ROWS")
	private Rows rows;

	public Rows getRows() {
		return rows;
	}

	public void setRows(Rows rows) {
		this.rows = rows;
	}

}

Rows.java

package com.zeng.xstream.model;

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

import com.thoughtworks.xstream.annotations.XStreamAlias;
import com.thoughtworks.xstream.annotations.XStreamImplicit;
import com.thoughtworks.xstream.annotations.XStreamImplicitCollection;

@XStreamAlias("ROWS")
@XStreamImplicitCollection("letters")
public class Rows {
	
	@XStreamAlias("APPEALBASE")
	private List<LetterItem> letters;

	public List<LetterItem> getLetters() {
		return letters;
	}

	public void setLetters(List<LetterItem> letters) {
		this.letters = letters;
	}

}

LetterItem.java

package com.zeng.xstream.model;

import com.thoughtworks.xstream.annotations.XStreamAlias;
import com.thoughtworks.xstream.annotations.XStreamImplicitCollection;

@XStreamAlias("APPEALBASE")
public class LetterItem {
	@XStreamAlias("ID")
	private String ID;
	private String USER_ID;
	private String APPEAL_NUM;
	private String APPEAL_RANDOM;
	private String CPTYPE;
	private String CPNAME;
	private String APPEAL_THEME;
	private String APPEAL_CONTONT;
	private String APPEAL_TRANS_STATE;
	private String APPEAL_FEEDBACK_INFO;
	private String APPEAL_EXTRA;
	private String ANNET_WHEN_ENDCASE;

	public String getID() {
		return ID;
	}

	public void setID(String iD) {
		ID = iD;
	}

	public String getUSER_ID() {
		return USER_ID;
	}

	public void setUSER_ID(String uSER_ID) {
		USER_ID = uSER_ID;
	}

	public String getAPPEAL_NUM() {
		return APPEAL_NUM;
	}

	public void setAPPEAL_NUM(String aPPEAL_NUM) {
		APPEAL_NUM = aPPEAL_NUM;
	}

	public String getAPPEAL_RANDOM() {
		return APPEAL_RANDOM;
	}

	public void setAPPEAL_RANDOM(String aPPEAL_RANDOM) {
		APPEAL_RANDOM = aPPEAL_RANDOM;
	}

	public String getCPTYPE() {
		return CPTYPE;
	}

	public void setCPTYPE(String cPTYPE) {
		CPTYPE = cPTYPE;
	}

	public String getCPNAME() {
		return CPNAME;
	}

	public void setCPNAME(String cPNAME) {
		CPNAME = cPNAME;
	}

	public String getAPPEAL_THEME() {
		return APPEAL_THEME;
	}

	public void setAPPEAL_THEME(String aPPEAL_THEME) {
		APPEAL_THEME = aPPEAL_THEME;
	}

	public String getAPPEAL_CONTONT() {
		return APPEAL_CONTONT;
	}

	public void setAPPEAL_CONTONT(String aPPEAL_CONTONT) {
		APPEAL_CONTONT = aPPEAL_CONTONT;
	}

	public String getAPPEAL_TRANS_STATE() {
		return APPEAL_TRANS_STATE;
	}

	public void setAPPEAL_TRANS_STATE(String aPPEAL_TRANS_STATE) {
		APPEAL_TRANS_STATE = aPPEAL_TRANS_STATE;
	}

	public String getAPPEAL_FEEDBACK_INFO() {
		return APPEAL_FEEDBACK_INFO;
	}

	public void setAPPEAL_FEEDBACK_INFO(String aPPEAL_FEEDBACK_INFO) {
		APPEAL_FEEDBACK_INFO = aPPEAL_FEEDBACK_INFO;
	}

	public String getAPPEAL_EXTRA() {
		return APPEAL_EXTRA;
	}

	public void setAPPEAL_EXTRA(String aPPEAL_EXTRA) {
		APPEAL_EXTRA = aPPEAL_EXTRA;
	}

	public String getANNET_WHEN_ENDCASE() {
		return ANNET_WHEN_ENDCASE;
	}

	public void setANNET_WHEN_ENDCASE(String aNNET_WHEN_ENDCASE) {
		ANNET_WHEN_ENDCASE = aNNET_WHEN_ENDCASE;
	}

}

上面代码主要是这两句

@XStreamAlias("ROWS")     //标签
@XStreamImplicitCollection("letters")// 这个表示隐式数组,“”里面值 需要跟你定义的变量名相同

 下面是实现代码

XStreamUtil.java

package com.zeng.xstream;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.io.xml.DomDriver;

public class XStreamUtil {
	private static Map<Class, Class> mClasses = new HashMap<Class, Class>();
	private static XStream xStream = new XStream(new DomDriver());
	private static Map<String, Class> wClasses = new HashMap<String, Class>();

	/**
	 * 
	 * @param clsz
	 *            每一层的标签对应的class (注意! 不是每一个标签!)
	 * @param fileName
	 *            文件路径("/sdcard/test.xml")
	 * @param NULL
	 *            暂没用到;
	 * @return 返回的是最外层对象：
	 */
	public static Object Xml2Object(List<Class> clsz, String fileName, String NULL) {
		for (Class cls : clsz) {
			if (mClasses.containsKey(cls))
				continue;
			mClasses.put(cls, cls);
			xStream.processAnnotations(cls);
		}
		try {
			// 这个是设置编码,因为可能编码不同会显现乱码，这个应该还没有具体解决乱码问题
			BufferedReader br = new BufferedReader(
					new InputStreamReader(new FileInputStream(fileName), "GBK"));
			return xStream.fromXML(br);
			// return xStream.fromXML(new FileReader(new
			// File(fileName)));//这个是直接读
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (UnsupportedEncodingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
	}

	/**
	 * 
	 * @param clsz
	 *            : 每一层的标签对应的class
	 * @param str
	 *            : xml 解析出来的String
	 * @return 返回的是最外层对象：
	 */
	public static Object Xml2Object(List<Class> clsz, String str) {
		for (Class cls : clsz) {
			if (mClasses.containsKey(cls))
				continue;
			mClasses.put(cls, cls);
			xStream.processAnnotations(cls);
		}
		return xStream.fromXML(str);
	}
	/*--------------------------------------------*/
	/*
	 * Xml2Object 与 Object2Xml 的区别在于
	 * xStream.processAnnotations(cls);
	 * xStream.alias(cls.node, cls.cls);
	 */
	/*-------------------------------------------*/
	/**
	 * 
	 * @param clsz
	 *            这个和上面的不同就是，这个写入的时候需要 标签 和 type(class); 所以定义了一个类，方便点;
	 * @param obj
	 *            这个是读取到的对象
	 * @return
	 */
	public static String Object2Xml(List<XStreamNode> clsz, Object obj) {
		for (XStreamNode cls : clsz) {
			if (wClasses.containsKey(cls.node))
				continue;
			wClasses.put(cls.node, cls.cls);
			xStream.alias(cls.node, cls.cls);
		}
		return xStream.toXML(obj);

	}

	static class XStreamNode {
		public XStreamNode(String node, Class cls) {
			// TODO Auto-generated constructor stub
			this.node = node;
			this.cls = cls;
		}

		public String node;
		public Class cls;
	}
}

XstreamTestActivity.java

package com.zeng.xstream;

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

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import com.zeng.xstream.XStreamUtil.XStreamNode;
import com.zeng.xstream.model.LetterInfoList;
import com.zeng.xstream.model.LetterItem;
import com.zeng.xstream.model.Rows;

public class XstreamTestActivity extends Activity {
	private Button read, write;
	private List<Class> list;
	private LetterInfoList data;
	private TextView tv_show;

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		read = (Button) findViewById(R.id.read);
		write = (Button) findViewById(R.id.write);
		tv_show = (TextView) findViewById(R.id.show);
		list = new ArrayList<Class>();
		list.add(LetterInfoList.class);
		list.add(Rows.class);
		list.add(LetterItem.class);
		read.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				Object obj = XStreamUtil.Xml2Object(list, "/sdcard/ceshi2.xml", "");
				System.out.println(obj.toString());
				data = (LetterInfoList) obj;
				Toast.makeText(XstreamTestActivity.this, "读取完毕", Toast.LENGTH_SHORT).show();
			}
		});
		write.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				XStreamNode item = new XStreamNode("LETTERINFOLIST", LetterInfoList.class);
				XStreamNode item1 = new XStreamNode("ROWS", Rows.class);
				XStreamNode item2 = new XStreamNode("APPEALBASE", LetterItem.class);
				List<XStreamNode> clsz = new ArrayList<XStreamUtil.XStreamNode>();
				clsz.add(item);
				clsz.add(item1);
				clsz.add(item2);
				String object2Xml = XStreamUtil.Object2Xml(clsz, data);
				System.out.println(object2Xml.toString());
				tv_show.setText(object2Xml.toString());
				FileOutputStream out = null;
				try {
					out = new FileOutputStream(new File("/sdcard/mytest.xml"));
					out.write(object2Xml.getBytes());
				} catch (FileNotFoundException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} finally {
					try {
						out.close();
					} catch (IOException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
				}
			}
		});
	}
}

layout,     main.xml

<?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="fill_parent"
    android:orientation="vertical" >

    <Button
        android:id="@+id/read"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="读取SD卡xml文件" />

    <Button
        android:id="@+id/write"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="写入SD卡xml文件" />

    <ScrollView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" >

        <TextView
            android:id="@+id/show"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="显示文本内容" />
    </ScrollView>

</LinearLayout>

下面是测试图效果

 下面是demo下载连接

http://download.youkuaiyun.com/detail/zgf1991/4517168

点击打开链接