Android开发之DOM解析xml文件的方法

<?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>

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; 
 } 
}

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;
}
}
}
}