使用XStream, 對於java object與xml之間的轉換

   

   因為是測試，所以是先從SD卡讀取一個xml檔案，轉換成對象，再把這個對象產生xml檔案，寫入SD卡，（若是從伺服器擷取的，就可以直接使用返回的字串了）

  另外需要注意的問題就是編碼，

 先發測試xml檔案。

/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>信件主題測試</APPEAL_THEME><APPEAL_CONTONT>來信內容,測試</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>信件主題測試</APPEAL_THEME><APPEAL_CONTONT>來信內容,測試</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>

下面是對應的對象

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;}}

上面代碼主要是這兩句

@XStreamAlias("ROWS")     //標籤@XStreamImplicitCollection("letters")// 這個表示隱式數組,“”裡面值 需要跟你定義的變數名相同

 下面是實現代碼

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 *            每一層的標籤對應的class (注意! 不是每一個標籤!) * @param fileName *            檔案路徑("/sdcard/test.xml") * @param NULL *            暫沒用到; * @return 返回的是最外層對象： */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 {// 這個是設定編碼,因為可能編碼不同會顯現亂碼，這個應該還沒有具體解決亂碼問題BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(fileName), "GBK"));return xStream.fromXML(br);// return xStream.fromXML(new FileReader(new// File(fileName)));//這個是直接讀} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (UnsupportedEncodingException e) {// TODO Auto-generated catch blocke.printStackTrace();}return null;}/** *  * @param clsz *            : 每一層的標籤對應的class * @param str *            : xml 解析出來的String * @return 返回的是最外層對象： */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 與 Object2Xml 的區別在於 * xStream.processAnnotations(cls); * xStream.alias(cls.node, cls.cls); *//*-------------------------------------------*//** *  * @param clsz *            這個和上面的不同就是，這個寫入的時候需要 標籤 和 type(class); 所以定義了一個類，方便點; * @param obj *            這個是讀取到的對象 * @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 stubthis.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. */@Overridepublic 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() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubObject obj = XStreamUtil.Xml2Object(list, "/sdcard/ceshi2.xml", "");System.out.println(obj.toString());data = (LetterInfoList) obj;Toast.makeText(XstreamTestActivity.this, "讀取完畢", Toast.LENGTH_SHORT).show();}});write.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubXStreamNode 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 blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();} finally {try {out.close();} catch (IOException e) {// TODO Auto-generated catch blocke.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="讀取SD卡xml檔案" />    <Button        android:id="@+id/write"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="寫入SD卡xml檔案" />    <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="顯示常值內容" />    </ScrollView></LinearLayout>

下面是測試圖效果

 下面是demo下載串連

http://download.csdn.net/detail/zgf1991/4517168

點擊開啟連結