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;
}
}
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;
}
}
@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
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.csdn.net/detail/zgf1991/4517168
点击打开链接