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;}}