Android中解析xml

2019-11-07 23:03:11

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Android中解析xml前必须生成xml，而生成xml得借用eclipse生成一个xml 如图：这里写图片描述首先要先在eclipse中生成一个xml，这里我是利用ssh框架进行测试

首先创建一个jsp页面 getData.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body><a href="studentActiongetXML.action">获取xml数据</a></body></html>

接下来写一个实体类 student.java

PRivate String name; private String sex; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getSex() { return sex; } public void setSex(String sex) { this.sex = sex; } public Student(String name, String sex) { super(); this.name = name; this.sex = sex; } public Student() { super(); // TODO Auto-generated constructor stub }

这里我并没有使用数据库中的表，而是自定义的一个list数组添加数据在StudentAction中

package com.zking.action;import java.util.ArrayList;import java.util.List;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;import com.zking.entity.Student;import net.sf.json.JSONArray;import net.sf.json.JSONObject;public class StudentAction extends ActionSupport{ public String getXML() throws Exception { //查询数据库，得到数据 List<Student> students=new ArrayList<>(); for (int i = 0; i <=20; i++) { Student student=new Student("娜娜", "女"); students.add(student); } //将对象集合保存到请求域中 ServletActionContext.getRequest().setAttribute("students", students); return "dataResult"; }}

因为是使用ssh的框架进行测试，所以需要在Struts.xml中添加一下代码：

<action name="studentAction*" class="com.zking.action.StudentAction" method="{1}"> <result name="dataResult">dataResult.jsp</result> </action>

接下来在eclipse中再写一个jsp代码生成xml，并且这个文件中的代码尽量不要有空格，一面解析出错,格式如同以下代码：

<?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" %><students><c:forEach items="${students}" var="s"> <student name="${s.name}"> <sex>${s.sex}</sex> </student> </c:forEach></students>

以上是在eclipse中生成xml的步骤，接下来是在Androidstudio中实现解析的代码

首先是页面的布局 activity_mian.xml

<?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" tools:context="com.example.g150825_class.MainActivity"> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="获取XML" android:onClick="getXML" /> <ListView android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/lv_main_list" ></ListView></LinearLayout>

接下来是要将eclipse中的实体类放入Androidstudio中

package com.example.g150825_class;public class Student { private String name; private String sex; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getSex() { return sex; } public void setSex(String sex) { this.sex = sex; } public Student(String name, String sex) { super(); this.name = name; this.sex = sex; } public Student() { super(); // TODO Auto-generated constructor stub } @Override public String toString() { return "Student [name=" + name + ", sex=" + sex + "]"; }}

解析xml需要将手机同电脑连接同一个网络，使用cmd得到ipconfig 然后将地址放入MainActivity.java中

package com.example.g150825_class;import android.app.ProgressDialog;import android.os.AsyncTask;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.util.Xml;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.LinearLayout;import android.widget.ListView;import android.widget.TextView;import org.xmlpull.v1.XmlPullParser;import org.xmlpull.v1.XmlPullParserException;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity { List<Student> studentList=new ArrayList<>(); private ListView lv_main_list; private MyAdater myAdater; private ProgressDialog progressDialog; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //实例化进度条对话框 progressDialog = new ProgressDialog(this); progressDialog.setMessage("正在加载中....."); lv_main_list = (ListView) findViewById(R.id.lv_main_list); //实例化适配器 myAdater = new MyAdater(); //设置适配器 lv_main_list.setAdapter(myAdater); } class MyAdater extends BaseAdapter{ @Override public int getCount() { return studentList.size(); } @Override public Object getItem(int i) { return studentList.get(i); } @Override public long getItemId(int i) { return i; } @Override public View getView(int i, View view, ViewGroup viewGroup) { LinearLayout layout=new LinearLayout(MainActivity.this); layout.setOrientation(LinearLayout.HORIZONTAL); TextView textViewName=new TextView(MainActivity.this); textViewName.setText(studentList.get(i).getName()); TextView textViewsex=new TextView(MainActivity.this); textViewsex.setText(studentList.get(i).getSex()); layout.addView(textViewName); layout.addView(textViewsex); return layout; } } public void getXML(View view){ new MyTask().execute(); } class MyTask extends AsyncTask{ private Student student; @Override protected void onPreExecute() { super.onPreExecute(); progressDialog.show(); } @Override protected Object doInBackground(Object[] objects) { //获取网络数据XML //01.确定网络路径 String path="http://192.168.43.109:8080/testssh/studentActiongetXML.action"; try { //02.实例化URL URL url=new URL(path); //03.获取连接对象 HttpURLConnection connection= (HttpURLConnection) url.openConnection(); //04.设置请求方式 connection.setRequestMethod("GET"); //05.设置请求连接超时的时间(优化) connection.setConnectTimeout(5000); //06.获取响应吗，结果 int code=connection.getResponseCode(); if(code==200){ //07.获取服务器返回过来的数据 InputStream is=connection.getInputStream(); //测试（打印） //缓冲字符流// BufferedReader br=new BufferedReader(new InputStreamReader(is));// String str=null;// while((str=br.readLine())!=null){// Log.i("test",str);//// Log.i("test","aaa");// } //解析PULL SAX 基于事件驱动 XmlPullParser xpp=Xml.newPullParser(); try { xpp.setInput(is,"UTF-8"); int type=xpp.getEventType(); while(type!=XmlPullParser.END_DOCUMENT){ switch (type) { case XmlPullParser.START_TAG: //获取开始标签的名字 String startTagName=xpp.getName(); if("student".equals(startTagName)){ student = new Student(); //获取name属性值 String name=xpp.getAttributeValue(0); student.setName(name); }else if("sex".equals(startTagName)){ //获取sex的文本值 String sex=xpp.nextText(); student.setSex(sex); } break; case XmlPullParser.END_TAG: //获取到结束标签的名字 String endTagName=xpp.getName(); if("student".equals(endTagName)){ studentList.add(student); } break; } type=xpp.next(); } } catch (XmlPullParserException e) { e.printStackTrace(); } } } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return null; } @Override protected void onPostExecute(Object o) { super.onPostExecute(o); //通知适配器发生改变 myAdater.notifyDataSetChanged(); progressDialog.cancel(); } }}

最后需要在清单文件中加入网络权限

<uses-permission android:name="android.permission.INTERNET"></uses-permission>

yi以上是解析xml的代码及思路，如果不理解，可以留言问我，下一篇还有解析json，可以去了解

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