本文实例讲述了android中dom解析xml文件的方法。分享给大家供大家参考,具体如下:
一、在assets文件中写xml文件
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<?xml version= "1.0" encoding= "utf-8" ?> <persons> <person id= "23" > <name>李明</name> <age> 30 </age> </person> <person id= "20" > <name>李向梅</name> <age> 25 </age> </person> </persons> |
二、在service中写一个dom解析的操作
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package com.example.service; import java.io.inputstream; import java.util.arraylist; import java.util.list; import javax.xml.parsers.documentbuilder; import javax.xml.parsers.documentbuilderfactory; import org.w3c.dom.document; import org.w3c.dom.element; import org.w3c.dom.node; import org.w3c.dom.nodelist; import com.example.domain.person; public class xmldomservice { public list<person> parsexml(inputstream is) { list<person> list = new arraylist<person>(); // 创建dom工厂对象 documentbuilderfactory factory = documentbuilderfactory.newinstance(); try { // documentbuilder对象 documentbuilder builder = factory.newdocumentbuilder(); // 获取文档对象 document document = builder.parse(is); // 获取文档对象的root element root = document.getdocumentelement(); // 获取persons根节点中所有的person节点对象 nodelist personnodes = root.getelementsbytagname( "person" ); // 遍历所有的person节点 for ( int i = 0 ; i < personnodes.getlength(); i++) { person person = new person(); // 根据item(index)获取该索引对应的节点对象 element personnode = (element) personnodes.item(i); // 具体的person节点 // 设置id属性值 person.setid(integer.parseint(personnode.getattribute( "id" ))); // 获取该节点下面的所有字节点 nodelist personchildnodes = personnode.getchildnodes(); // 遍历person的字节点 for ( int index = 0 ; index < personchildnodes.getlength(); index++) { // 获取子节点 node node = personchildnodes.item(index); // 判断node节点是否是元素节点 if (node.getnodetype() == node.element_node) { //把节点转换成元素节点 element element = (element) node; //判断元素节点是否是name元素节点 if ( "name" .equals(element.getnodename())) { person.setname(element.getfirstchild() .getnodevalue()); } else if ( "age" .equals(element.getnodename())) { //判断是否是age节点 person.setage( new short (element.getfirstchild().getnodevalue())); } } } // 把person对象加入到集合中 list.add(person); } //关闭输入流 is.close(); } catch (exception e) { // todo auto-generated catch block e.printstacktrace(); } return list; } } |
三、在activity中显示操作
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package com.example.lession03_xml; import java.io.inputstream; import java.util.list; import javax.xml.parsers.saxparser; import javax.xml.parsers.saxparserfactory; import com.example.domain.person; import com.example.service.xmlcontenthandler; import com.example.service.xmldomservice; import android.os.bundle; import android.app.activity; import android.view.menu; import android.view.view; import android.view.view.onclicklistener; import android.view.inputmethod.inputbinding; import android.widget.button; import android.widget.toast; public class xmlactivityextends activity { //声明组件 public button btn_sax,btn_dom,btn_pull; public xmldomservice xmldomservice; @override protected void oncreate(bundle savedinstancestate) { super .oncreate(savedinstancestate); //设置显示的视图 setcontentview(r.layout.activity_xml); xmldomservice= new xmldomservice(); //根据id获取组件 btn_sax=(button) findviewbyid(r.id.btn_sax); btn_dom=(button) findviewbyid(r.id.btn_dom); btn_pull=(button) findviewbyid(r.id.btn_pull); //为按钮注册事件 btn_sax.setonclicklistener( new myonclicklistener()); btn_dom.setonclicklistener( new myonclicklistener()); btn_pull.setonclicklistener( new myonclicklistener()); } @override public boolean oncreateoptionsmenu(menu menu) { // inflate the menu; this adds items to the action bar if it is present. getmenuinflater().inflate(r.menu.xml, menu); return true ; } //匿名类 class myonclicklistener implements onclicklistener{ @override public void onclick(view v) { int id=v.getid(); switch (id) { case r.id.btn_sax: toast.maketext(xmlactivity. this , "采用sax解析" , toast.length_long).show(); try { //sax解析的工厂对象 saxparserfactory factory=saxparserfactory.newinstance(); //得到sax的解析器 saxparser saxparser=factory.newsaxparser(); //创建handler对象 xmlcontenthandler handlerservice= new xmlcontenthandler(); inputstream is=getassets().open( "csdn.xml" ); //直接解析 saxparser.parse(is, handlerservice); //通过handlerservice对象获取 toast.maketext(xmlactivity. this , "----" +handlerservice, toast.length_long).show(); } catch (exception e){ e.printstacktrace(); } break ; case r.id.btn_dom: inputstream is= null ; try { //获取读取文件的输入流对象 is=getassets().open( "csdn.xml" ); //采用dom解析 list<person> persons=xmldomservice.parsexml(is); //简单测试 //toast.maketext(xmlactivity.this, ""+persons.get(0).getname(), toast.length_long).show(); toast.maketext(xmlactivity. this , "采用dom解析" +persons.get( 0 ).getname(), toast.length_long).show(); } catch (exception e){ e.printstacktrace(); } break ; case r.id.btn_pull: toast.maketext(xmlactivity. this , "采用pull解析" , toast.length_long).show(); break ; default : break ; } } } } |
希望本文所述对大家android程序设计有所帮助。