Android学习笔记(八)之Android 读写xml文件

/** * XmlTool.java * 版权所有(C) 2012  * 创建:cuiran 2012-9-19 下午3:39:40 */package com.wpn.xml;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.io.OutputStreamWriter;import java.io.StringWriter;import java.util.ArrayList;import java.util.List;import org.xmlpull.v1.XmlPullParser;import org.xmlpull.v1.XmlSerializer;import android.content.Context;import android.util.Log;import android.util.Xml;import com.alibaba.fastjson.JSON;import com.wpn.constants.Conf;import com.wpn.data.UserSessionDic;import com.wpn.message.CallMessage;/** * TODO * @author cuiran * @version TODO */public class XmlTool {public boolean writeXML(List<CallMessage> users){boolean flag=false;String str=writeToString(users);flag=writeToXml(UserSessionDic.getContext(), str);return flag;} public String writeToString(List<CallMessage> users){  //实现xml信息序列号的一个对象    XmlSerializer serializer=Xml.newSerializer();      StringWriter writer=new StringWriter();try{//xml数据经过序列化后保存到String中，然后将字串通过OutputStream保存为xml文件           serializer.setOutput(writer);                   //文档开始        serializer.startDocument("utf-8", true);               //开始一个节点           serializer.startTag("", "calls"); serializer.attribute("", "type", "list");   for(CallMessage call :users){Log.i(Conf.TAG_DUBUG, "call="+JSON.toJSONString(call)); serializer.startTag("", "call");         /** * 加属性 */// serializer.attribute("", "ordernum", call.getOrdernum()); serializer.startTag("", "ordernum");   serializer.text(call.getOrdernum()); serializer.endTag("", "ordernum");      serializer.startTag("", "bytime");   serializer.text(call.getBytime()); serializer.endTag("", "bytime");      serializer.startTag("", "notifytime");   serializer.text(call.getNotifytime()); serializer.endTag("", "notifytime");      serializer.startTag("", "servertime");   serializer.text(call.getServertime()); serializer.endTag("", "servertime");       serializer.startTag("", "slocation");   serializer.text(call.getSlocation()); serializer.endTag("", "slocation");     serializer.startTag("", "isread");   serializer.text(call.getIsread()); serializer.endTag("", "isread");      serializer.endTag("", "call");         } serializer.endTag("", "calls");      //关闭文档            serializer.endDocument(); }catch (Exception e) {Log.i(Conf.TAG_ERROR, e.getMessage());}return writer.toString();}  /**   * 将xml字符串写入xml文件   * @param context   * @param str   * @return   */ public boolean writeToXml(Context context,String str){        try {            OutputStream out=context.openFileOutput("calls.xml", Context.MODE_PRIVATE);            OutputStreamWriter outw=new OutputStreamWriter(out);            try {                outw.write(str);                outw.close();                out.close();                return true;            } catch (IOException e) {                // TODO Auto-generated catch block                return false;            }        } catch (FileNotFoundException e) {            // TODO Auto-generated catch block            return false;        }    }   /**  * 验证是否存在该文件  * @return  * @throws Exception  */ public boolean isExist()throws Exception{ boolean flag=false;     FileInputStream fs=  UserSessionDic.getContext().openFileInput("calls.xml");     if(fs!=null){     flag=true;     }          return flag; } public List<CallMessage> xmlParser() throws Exception{ List<CallMessage> reslist= null; CallMessage call=null;     try {     FileInputStream fs=  UserSessionDic.getContext().openFileInput("calls.xml");  XmlPullParser parser = Xml.newPullParser();    parser.setInput(fs, "UTF-8");  int eventType = parser.getEventType();  while ((eventType = parser.next()) != XmlPullParser.END_DOCUMENT) {    switch (eventType) {case XmlPullParser.START_TAG:String name=parser.getName();Log.i(Conf.TAG_DUBUG, "name："+name); if (parser.getName().equals("calls")) {reslist = new ArrayList<CallMessage>(); } else if (name.equals("call")) {call = new CallMessage(Conf.COMMANDID_RECEIVE);//contact.setId(Integer.valueOf(parser.getAttributeValue(0)));} else if (name.equals("ordernum")) {String ordernum=parser.nextText();Log.i(Conf.TAG_DUBUG, "订单："+ordernum);call.setOrdernum(ordernum);} else if (name.equals("bytime")) {call.setBytime(parser.nextText());}else if (name.equals("notifytime")) {call.setNotifytime(parser.nextText());}else if (name.equals("servertime")) {call.setServertime(parser.nextText());}else if (name.equals("slocation")) {call.setSlocation(parser.nextText());}else if (name.equals("isread")) {call.setIsread(parser.nextText());}  break;case XmlPullParser.END_TAG:String name1=parser.getName();if (name1.equals("call")) {reslist.add(call);}break;}    }     } catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();} return reslist;}}
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