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详解Android之解析XML文件三种方式（DOM，PULL，SAX）

程序员文章站 2023-12-13 20:41:22
1.xml文件代码 <%@ page la...

1.xml文件代码

<?xml version="1.0" encoding="utf-8" ?>
<%@ page language="java" contenttype="text/xml; charset=utf-8" pageencoding="utf-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ page iselignored="false" %>
<fqs>
<c:foreach items="${fqs}" var="fq">
      <fq name="${fq.name}">
        <content>${fq.content}</content>
        <time>${fq.time}</time>
      </fq>
  </c:foreach>
</fqs>

2.xml网页效果图

详解Android之解析XML文件三种方式（DOM，PULL，SAX）

3.android代码

1.布局文件

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:id="@+id/activity_main"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical">

  <button
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:onclick="getxml"
    android:text="获取xml数据" />

  <listview
    android:id="@+id/lv_main_list"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

  </listview>
</linearlayout>

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:id="@+id/activity_main_pull"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical">

  <button
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:onclick="getpull"
    android:text="获取pull数据" />

  <listview
    android:id="@+id/lv_mainpull_list"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
  </listview>
</linearlayout>

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:id="@+id/activity_main_sax"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical">

  <button
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:onclick="getsax"
    android:text="获取sax数据" />

  <listview
    android:id="@+id/lv_mainsax_list"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
  </listview>
</linearlayout>

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="horizontal">

  <textview
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:id="@+id/tv_item_listview_name"
    android:layout_weight="1"/>

  <textview
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:id="@+id/tv_item_listview_content"
    android:layout_weight="1"/>

  <textview
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:id="@+id/tv_item_listview_time"
    android:layout_weight="1"/>
</linearlayout>

2.java代码

dom解析代码

public class mainactivity extends appcompatactivity {

  private listview lv_main_list;
  private progressdialog progressdialog;
  private list<fq> fqs = new arraylist<>();
  private myadapter myadapter;

  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main);
    lv_main_list = (listview) findviewbyid(r.id.lv_main_list);

    myadapter = new myadapter();
    lv_main_list.setadapter(myadapter);

    progressdialog = new progressdialog(this);
    progressdialog.setmessage("小青正在拼命加載中.....");
  }

  class myadapter extends baseadapter{

    @override
    public int getcount() {
      return fqs.size();
    }

    @override
    public object getitem(int position) {
      return fqs.get(position);
    }

    @override
    public long getitemid(int position) {
      return position;
    }

    @override
    public view getview(int position, view convertview, viewgroup parent) {
      if(convertview==null){
        convertview=layoutinflater.from(mainactivity.this).inflate(r.layout.item_list,null);
        itemtag itemtag=new itemtag();
        itemtag.tv_name= (textview) convertview.findviewbyid(r.id.tv_item_listview_name);
        itemtag.tv_content= (textview) convertview.findviewbyid(r.id.tv_item_listview_content);
        itemtag.tv_tiem= (textview) convertview.findviewbyid(r.id.tv_item_listview_time);
        convertview.settag(itemtag);
      }
      itemtag itemtag= (itemtag) convertview.gettag();
      itemtag.tv_name.settext(fqs.get(position).getname());
      itemtag.tv_content.settext(fqs.get(position).getcontent());
      itemtag.tv_tiem.settext(fqs.get(position).gettime());

      return convertview;
    }
  }

  public void getxml(view view) {
    new mytask().execute();
  }

  class mytask extends asynctask {
    //获取数据前
    @override
    protected void onpreexecute() {
      super.onpreexecute();
      progressdialog.show();
    }

    @override
    protected object doinbackground(object[] params) {
      //获取网络数据
      //1.定义获取网络的数据的路径
      string path = "http://192.168.43.149:8080/dataresult.xhtml";
      //2.实例化url
      try {
        url url = new url(path);
        //3.获取链接对象
        httpurlconnection httpurlconnection = (httpurlconnection) url.openconnection();
        //4.设置请求
        httpurlconnection.setrequestmethod("get");
        //5.设置请求链接超时的时间
        httpurlconnection.setconnecttimeout(5000);
        //6.获取响应码
        int code = httpurlconnection.getresponsecode();
        if (code == 200) {
          //7.获取返回过来的数据（xml）
          inputstream is = httpurlconnection.getinputstream();
          //8.使用dom解析xml文件
          documentbuilderfactory documentbuilderfactory=documentbuilderfactory.newinstance();
          documentbuilder documentbuilder=documentbuilderfactory.newdocumentbuilder();
          document document=documentbuilder.parse(is);
          //获取根标签
          element root=document.getdocumentelement();
          nodelist nodelist = root.getelementsbytagname("fq");
          for (int i = 0; i < nodelist.getlength(); i++) {
            element element = (element) nodelist.item(i);
            //获取属性name
            string name = element.getattribute("name");
            //获取子标签content,time
            element elementcontent = (element) element.getelementsbytagname("content").item(0);
            string content = elementcontent.gettextcontent();
            element elementtime = (element) element.getelementsbytagname("time").item(0);
            string time = elementtime.gettextcontent();
            fq fq = new fq(name, content, time);
            fqs.add(fq);
          }
        }
      } catch (exception e) {
        e.printstacktrace();
      }
      return fqs;
    }

    //获取数据后更新ui
    @override
    protected void onpostexecute(object o) {
      super.onpostexecute(o);
      progressdialog.cancel();
      myadapter.notifydatasetchanged();
    }
  }
}

pull解析代码

public class mainpullactivity extends appcompatactivity {

  private listview lv_mainpull_list;
  private progressdialog progressdialog;
  private list<fq> fqs = new arraylist<>();
  private myadapter myadapter;

  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main_pull);
    myadapter = new myadapter();
    lv_mainpull_list = (listview) findviewbyid(r.id.lv_mainpull_list);
    lv_mainpull_list.setadapter(myadapter);

    progressdialog = new progressdialog(this);
    progressdialog.setmessage("小青正在拼命加載中.....");
  }

  class myadapter extends baseadapter {

    @override
    public int getcount() {
      return fqs.size();
    }

    @override
    public object getitem(int position) {
      return fqs.get(position);
    }

    @override
    public long getitemid(int position) {
      return position;
    }

    @override
    public view getview(int position, view convertview, viewgroup parent) {
      if (convertview == null) {
        convertview = layoutinflater.from(mainpullactivity.this).inflate(r.layout.item_list, null);
        itemtag itemtag = new itemtag();
        itemtag.tv_name = (textview) convertview.findviewbyid(r.id.tv_item_listview_name);
        itemtag.tv_content = (textview) convertview.findviewbyid(r.id.tv_item_listview_content);
        itemtag.tv_tiem = (textview) convertview.findviewbyid(r.id.tv_item_listview_time);
        convertview.settag(itemtag);
      }
      itemtag itemtag = (itemtag) convertview.gettag();
      itemtag.tv_name.settext(fqs.get(position).getname());
      itemtag.tv_content.settext(fqs.get(position).getcontent());
      itemtag.tv_tiem.settext(fqs.get(position).gettime());

      return convertview;
    }
  }

  public void getpull(view view) {
    new mytask().execute();
  }

  class mytask extends asynctask {
    private fq fq;

    //获取数据前
    @override
    protected void onpreexecute() {
      super.onpreexecute();
      progressdialog.show();
    }

    @override
    protected object doinbackground(object[] params) {
      //获取网络数据
      //1.定义获取网络的数据的路径
      string path = "http://192.168.43.149:8080/dataresult.xhtml";
      //2.实例化url
      try {
        url url = new url(path);
        //3.获取链接对象
        httpurlconnection httpurlconnection = (httpurlconnection) url.openconnection();
        //4.设置请求
        httpurlconnection.setrequestmethod("get");
        //5.设置请求链接超时的时间
        httpurlconnection.setconnecttimeout(5000);
        //6.获取响应码
        int code = httpurlconnection.getresponsecode();
        if (code == 200) {
          //7.获取返回过来的数据（xml）
          inputstream is = httpurlconnection.getinputstream();
          //8.解析xml
          //使用pull解析xml文件
          xmlpullparser pullparser= xml.newpullparser();
          pullparser.setinput(is,"utf-8");
          int type=pullparser.geteventtype();
          while (type!=xmlpullparser.end_document){
            switch (type){
              case xmlpullparser.start_tag:
                //获取开始标签名字
                string starttafname=pullparser.getname();
                 if("fq".equals(starttafname)){
                   fq = new fq();
                   string name=pullparser.getattributevalue(0);
                   fq.setname(name);
                 }else if ("content".equals(starttafname)){
                   string content=pullparser.nexttext();
                   fq.setcontent(content);
                 }else if ("time".equals(starttafname)){
                   string time=pullparser.nexttext();
                   fq.settime(time);
                 }
                break;
              case xmlpullparser.end_tag:
                //获取接受标签的名字
                string endtagname=pullparser.getname();
                if("fq".equals(endtagname)){
                  fqs.add(fq);
                }
                break;
            }
            type=pullparser.next();
          }
        }
      } catch (exception e) {
        e.printstacktrace();
      }
      return fqs;
    }

    //获取数据后更新ui
    @override
    protected void onpostexecute(object o) {
      super.onpostexecute(o);
      progressdialog.cancel();
      myadapter.notifydatasetchanged();
    }
  }
}

sax解析代码

public class mainsaxactivity extends appcompatactivity {

  private listview lv_mainsax_list;
  private progressdialog progressdialog;
  private list<fq> fqs = new arraylist<>();
  private myadapter myadapter;
  private string currenttag = null;

  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main_sax);
    lv_mainsax_list = (listview) findviewbyid(r.id.lv_mainsax_list);
    myadapter = new myadapter();
    lv_mainsax_list.setadapter(myadapter);

    progressdialog = new progressdialog(this);
    progressdialog.setmessage("小青正在拼命加載中.....");
  }

  class myadapter extends baseadapter {

    @override
    public int getcount() {
      return fqs.size();
    }

    @override
    public object getitem(int position) {
      return fqs.get(position);
    }

    @override
    public long getitemid(int position) {
      return position;
    }

    @override
    public view getview(int position, view convertview, viewgroup parent) {
      if (convertview == null) {
        convertview = layoutinflater.from(mainsaxactivity.this).inflate(r.layout.item_list, null);
        itemtag itemtag = new itemtag();
        itemtag.tv_name = (textview) convertview.findviewbyid(r.id.tv_item_listview_name);
        itemtag.tv_content = (textview) convertview.findviewbyid(r.id.tv_item_listview_content);
        itemtag.tv_tiem = (textview) convertview.findviewbyid(r.id.tv_item_listview_time);
        convertview.settag(itemtag);
      }
      itemtag itemtag = (itemtag) convertview.gettag();
      itemtag.tv_name.settext(fqs.get(position).getname());
      itemtag.tv_content.settext(fqs.get(position).getcontent());
      itemtag.tv_tiem.settext(fqs.get(position).gettime());

      return convertview;
    }
  }

  public void getsax(view view) {
    new mytask().execute();
  }

  class mytask extends asynctask {

    private fq fq;

    //获取数据前
    @override
    protected void onpreexecute() {
      super.onpreexecute();
      progressdialog.show();
    }

    @override
    protected object doinbackground(object[] params) {
      //获取网络数据
      //1.定义获取网络的数据的路径
      string path = "http://192.168.43.149:8080/dataresult.xhtml";
      //2.实例化url
      try {
        url url = new url(path);
        //3.获取链接对象
        httpurlconnection httpurlconnection = (httpurlconnection) url.openconnection();
        //4.设置请求
        httpurlconnection.setrequestmethod("get");
        //5.设置请求链接超时的时间
        httpurlconnection.setconnecttimeout(5000);
        //6.获取响应码
        int code = httpurlconnection.getresponsecode();
        if (code == 200) {
          //7.获取返回过来的数据（xml）
          inputstream is = httpurlconnection.getinputstream();
          //8.解析xml
          //使用sax解析xml文件
          saxparserfactory saxparserfactory = saxparserfactory.newinstance();
          saxparser saxparser = saxparserfactory.newsaxparser();
          saxparser.parse(is, new defaulthandler() {
            @override
            public void startdocument() throws saxexception {
              super.startdocument();
            }

            @override
            public void enddocument() throws saxexception {
              super.enddocument();
            }

            @override
            public void startelement(string uri, string localname, string qname, attributes attributes) throws saxexception {
              super.startelement(uri, localname, qname, attributes);
              currenttag = localname;
              if ("fq".equals(localname)) {
                //实例化对象
                fq = new fq();
                string name = attributes.getvalue(0);
                fq.setname(name);
              }
            }

            @override
            public void endelement(string uri, string localname, string qname) throws saxexception {
              super.endelement(uri, localname, qname);
              currenttag=null;
              if ("fq".equals(localname)){
                fqs.add(fq);
              }
            }

            @override
            public void characters(char[] ch, int start, int length) throws saxexception {
              super.characters(ch, start, length);
              if ("content".equals(currenttag)) {
                string content = new string(ch, start, length);
                fq.setcontent(content);
              }else if ("time".equals(currenttag)) {
                string time = new string(ch, start, length);
                fq.settime(time);
              }
            }
          });
        }
      } catch (exception e) {
        e.printstacktrace();
      }
      return fqs;
    }

    //获取数据后更新ui
    @override
    protected void onpostexecute(object o) {
      super.onpostexecute(o);
      progressdialog.cancel();
      myadapter.notifydatasetchanged();
    }
  }
}

实体类

public class fq {
  private string name;
  private string content;
  private string time;

  public fq(){}
  public fq(string name, string time, string content) {
    this.name = name;
    this.time = time;
    this.content = content;
  }

  public string getname() {
    return name;
  }

  public void setname(string name) {
    this.name = name;
  }

  public string getcontent() {
    return content;
  }

  public void setcontent(string content) {
    this.content = content;
  }

  public string gettime() {
    return time;
  }

  public void settime(string time) {
    this.time = time;
  }
}

public class itemtag {
  public textview tv_name;
  public textview tv_content;
  public textview tv_tiem;
}

配置文件添加联网权限

<!-- 添加联网的权限 -->
<uses-permission android:name="android.permission.internet" />

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。

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