XML file Read and write methods for Android programming _android

This article describes the XML file read and write methods of Android programming. Share to everyone for your reference. The specific analysis is as follows:

First, the environment:

Host: WIN8
Development environment: Eclipse

Second, note:

1. Open the XML file in the SD card, if it does not exist, create a new one and write the default configuration
2. Reading XML files

Three, XML file format:

<?xml version= "1.0" encoding= "UTF-8" standalone= "true"?> 
-<config> 
<title> Remote video interview system </ title> 
<local_port>12600</local_port> 
<schedule_service_ip>10.58.1.59</ schedule_service_ip>
<schedule_service_port>12601</schedule_service_port> 
</config >

Four, the source code:

Package com.example.helloanychat; 
Import Java.io.File; 
Import Java.io.FileInputStream; 
Import Java.io.FileOutputStream; 
Import java.io.IOException; 
Import Java.io.StringWriter; 
Import java.net.Inet6Address; 
Import java.net.InetAddress; 
Import Java.net.NetworkInterface; 
Import java.net.SocketException; 
Import java.util.Enumeration; 
Import Javax.xml.parsers.DocumentBuilder; 
Import Javax.xml.parsers.DocumentBuilderFactory; 
Import android.os.Environment; 
Import Android.util.Log; 
Import org.w3c.dom.Document; 
Import org.w3c.dom.Element; 
Import org.w3c.dom.NodeList; 
Import Org.xmlpull.v1.XmlPullParserFactory; 
Import Org.xmlpull.v1.XmlSerializer; /** * Configuration Information class * New Date: 2014/12/8 by JDH/public class Config implements If_config {//configuration information Private Config_info Co 
 Nfig_info = new Config_info (); 
  /** * Constructor/public Config () {Boolean OK; 
  File Sd_path; 
  File File_cfg_dir; 
  File file_cfg; 
  FileOutputStream out; 
  String str; 
 FileInputStream in; Get the native IP address config_info.local_ip = getlocalipaddress (); 
  System.out.printf ("Local ip:%s\n", CONFIG_INFO.LOCAL_IP); 
  Get SD card Directory Sd_path = Environment.getexternalstoragedirectory ();
  Determine if the folder exists File_cfg_dir = new file (Sd_path.getpath () + "//remote_meeting"); 
   if (!file_cfg_dir.exists () &&!file_cfg_dir.isdirectory ()) {System.out.println ("Configuration folder remote_meeting does not exist!"); 
   OK = File_cfg_dir.mkdirs (); 
   if (OK) {System.out.println ("Create folder succeeded!");      
   else {System.out.println ("Create folder failed!");
  }//Determine if the configuration file exists file_cfg = new file (File_cfg_dir.getpath (), "Cfg.xml");
   if (!file_cfg.exists ()) {System.out.println ("config file cfg.xml does not exist!"); 
    try {file_cfg.createnewfile ();
    System.out.println ("Create File Cfg.xml successful!");
     Generate initialized configuration data try {out = new FileOutputStream (FILE_CFG);
     Save default configuration Config_info.title = "Remote video interview system"; 
     Config_info.local_port = 12600;
     CONFIG_INFO.SCHEDULE_SERVER_IP = "10.58.1.59"; Config_info. Schedule_server_port = 12601;
     str = produce_xml_string (config_info); 
     Out.write (Str.getbytes ()); 
    Out.close (); 
    catch (IOException e) {//TODO auto-generated catch block E.printstacktrace (); 
   The catch (IOException e) {//TODO auto-generated catch block E.printstacktrace (); 
  } config_info.title = "remote"; 
  Config_info.local_port = 126;
  CONFIG_INFO.SCHEDULE_SERVER_IP = "10.5";
  Config_info.schedule_server_port = 12; System.out.printf ("----222222222%s,%d,%s,%d\n", Config_info.title,config_info.local_port, Config_info.schedule_
  Server_ip,config_info.schedule_server_port);
   Parse XML file try {in = new FileInputStream (FILE_CFG); 
   Documentbuilderfactory factory = Documentbuilderfactory.newinstance ();
   Documentbuilder builder = Factory.newdocumentbuilder ();
   Document document = Builder.parse (in);
   Gets the root node Element root = Document.getdocumentelement (); 
   NodeList node = root.getchildnodes (); 
 Get 1th child node: Title  Config_info.title = Node.item (0). Getfirstchild (). Getnodevalue ();
   Get 2nd child node: Native Port Config_info.local_port = Integer.parseint (Node.item (1). Getfirstchild (). Getnodevalue ()); 
   Get 3rd child node: Dispatch server IP config_info.schedule_server_ip = Node.item (2). Getfirstchild (). Getnodevalue (); Get 4th child node: Dispatch server Port Config_info.schedule_server_port = Integer.parseint (Node.item (3). Getfirstchild (). Getnodevalue ()  
   ); System.out.printf ("----222222222%s,%d,%s,%d\n", Config_info.title,config_info.local_port, Config_info.schedule_ 
  Server_ip,config_info.schedule_server_port); 
  catch (Exception e) {e.printstacktrace (); 
 @Override public Config_info Get_config_info () {return config_info; /** * Get native IP address * @return native IP address/private String getlocalipaddress () {try {for Enumeration<ne Tworkinterface> en = networkinterface. getnetworkinterfaces (); En.hasmoreelements ();) 
    {NetworkInterface intf = en.nextelement (); for (enumeration<inetaddress> enumipaddr = intf. getinetaddresses (); Enumipaddr.hasmoreelements ();) 
     {InetAddress inetaddress = enumipaddr.nextelement (); if (!inetaddress.isloopbackaddress ()) {if (!inetaddress.isloopbackaddress () &&! ( 
     InetAddress instanceof inet6address)) {return inetaddress.gethostaddress (). toString (); 
  catch (SocketException ex) {LOG.E ("wifipreference IPAddress", ex.tostring ()); 
 return null; /** * Generate XML configuration file string data stream * Config_info native IP information does not save * @param info: Configuration information * @return XML string Data flow * * PRIV 
  Ate String produce_xml_string (Config_info Info) {StringWriter StringWriter = new StringWriter (); 
   try {//Get XmlSerializer object Xmlpullparserfactory factory = Xmlpullparserfactory.newinstance (); 
   XmlSerializer XmlSerializer = Factory.newserializer (); 
   Set the output Stream object Xmlserializer.setoutput (StringWriter); 
   Start tag xmlserializer.startdocument ("Utf-8", true); XmlserIalizer.starttag (null, "config"); 
   Title Xmlserializer.starttag (null, "title"); 
   Xmlserializer.text (Info.title); 
   Xmlserializer.endtag (null, "title"); 
   Native port Xmlserializer.starttag (null, "Local_port"); 
   Xmlserializer.text (integer.tostring (Info.local_port)); 
   Xmlserializer.endtag (NULL, "Local_port"); 
   Dispatch server IP xmlserializer.starttag (null, "schedule_service_ip"); 
   Xmlserializer.text (INFO.SCHEDULE_SERVER_IP); 
   Xmlserializer.endtag (NULL, "schedule_service_ip"); 
   Dispatch server port Xmlserializer.starttag (null, "Schedule_service_port"); 
   Xmlserializer.text (integer.tostring (Info.schedule_server_port)); 
   Xmlserializer.endtag (NULL, "Schedule_service_port"); 
   Xmlserializer.endtag (null, "config"); 
  Xmlserializer.enddocument (); 
  catch (Exception e) {e.printstacktrace (); 
 return stringwriter.tostring (); } 
}

I hope this article will help you with your Android program.