Android 与 web后台数据交互之解析XML和JSON
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Android 与 web后台数据交互之解析XML和JSON
转载至 :http://blog.csdn.net/a985548426/article/details/76163408思维导图:
Android的网络编程中去拿服务器的数据,一般只采用两种方式。XML和Json,所以今天我们简单做一个案列示范,
其他复杂的都离不开这最基础的步骤。
效果图:
布局:
输出结果:
xml解析
json解析
第一步:我们需要xml文件和JSON文件(源文件放在服务器上面)(实际项目开发中我们是动态生成的)
①student.xml
- <?xml version=“1.0” encoding=“UTF-8”?>
- <students>
- <student sid=“1”>
- <sname>码农01</sname>
- <sage>101</sage>
- </student>
- <student sid=“2”>
- <sname>码农02</sname>
- <sage>102</sage>
- </student>
- <student sid=“3”>
- <sname>码农03</sname>
- <sage>103</sage>
- </student>
- </students>
<?xml version="1.0" encoding="UTF-8"?> <students> <student sid="1"> <sname>码农01</sname> <sage>101</sage> </student> <student sid="2"> <sname>码农02</sname> <sage>102</sage> </student> <student sid="3"> <sname>码农03</sname> <sage>103</sage> </student> </students>
②students.json
- {“count”:3,”students”:[{“sid”:1,”sname”:”小小”,”ssex”:”女”},{“sid”:2,”sname”:”小码”,”ssex”:”男”},{“sid”:3,”sname”:”小农”,”ssex”:”男”}]}
{"count":3,"students":[{"sid":1,"sname":"小小","ssex":"女"},{"sid":2,"sname":"小码","ssex":"男"},{"sid":3,"sname":"小农","ssex":"男"}]}
第二步: 写好布局文件
- <?xml version=“1.0” encoding=“utf-8”?>
- <LinearLayout
- xmlns:android=“http://schemas.android.com/apk/res/android”
- xmlns:app=“http://schemas.android.com/apk/res-auto”
- xmlns:tools=“http://schemas.android.com/tools”
- android:layout_width=“match_parent”
- android:layout_height=“match_parent”
- android:orientation=“vertical”
- tools:context=“com.example.android31_xmlorjson.MainActivity”>
- <Button
- android:layout_width=“match_parent”
- android:layout_height=“wrap_content”
- android:text=“获取网络xml”
- android:onClick=“getNetXml”
- />
- <Button
- android:layout_width=“match_parent”
- android:layout_height=“wrap_content”
- android:text=“获取网络JSON”
- android:onClick=“getNetJSON”
- />
- </LinearLayout>
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context="com.example.android31_xmlorjson.MainActivity"> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:text="获取网络xml" android:onClick="getNetXml" /> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:text="获取网络JSON" android:onClick="getNetJSON" /></LinearLayout>
第三步:核心处理类
注意:
1、手机获取服务端数据需要在AndroidManifest.xml配上权限
- <!–网络权限–>
- <uses-permission android:name=“android.permission.INTERNET”></uses-permission>
<!--网络权限--><uses-permission android:name="android.permission.INTERNET"></uses-permission>2、JSON解析所需要用的实体类
BigObject.Java
- package com.example.android31_xmlorjson;
- import java.util.List;
- /**
- * Created by Administrator on 2017/7/26 0026.
- */
- public class BigObject {
- private int count;
- private List<Student> students;
- public BigObject() {
- }
- public BigObject(int count, List<Student> students) {
- this.count = count;
- this.students = students;
- }
- public void setCount(int count) {
- this.count = count;
- }
- public void setStudents(List<Student> students) {
- this.students = students;
- }
- public int getCount() {
- return count;
- }
- public List<Student> getStudents() {
- return students;
- }
- }
package com.example.android31_xmlorjson;import java.util.List;/** * Created by Administrator on 2017/7/26 0026. */public class BigObject { private int count; private List<Student> students; public BigObject() { } public BigObject(int count, List<Student> students) { this.count = count; this.students = students; } public void setCount(int count) { this.count = count; } public void setStudents(List<Student> students) { this.students = students; } public int getCount() { return count; } public List<Student> getStudents() { return students; }}student.java
- package com.example.android31_xmlorjson;
- /**
- * Created by Administrator on 2017/7/26 0026.
- */
- public class Student {
- private int sid;
- private String sname;
- private String ssex;
- public Student() {
- }
- public Student(int sid, String sname, String sex) {
- this.sid = sid;
- this.sname = sname;
- this.ssex = ssex;
- }
- public void setSid(int sid) {
- this.sid = sid;
- }
- public void setSname(String sname) {
- this.sname = sname;
- }
- public void setSsex(String ssex) {
- this.ssex = ssex;
- }
- public int getSid() {
- return sid;
- }
- public String getSname() {
- return sname;
- }
- public String getSsex() {
- return ssex;
- }
- }
package com.example.android31_xmlorjson;/** * Created by Administrator on 2017/7/26 0026. */public class Student { private int sid; private String sname; private String ssex; public Student() { } public Student(int sid, String sname, String sex) { this.sid = sid; this.sname = sname; this.ssex = ssex; } public void setSid(int sid) { this.sid = sid; } public void setSname(String sname) { this.sname = sname; } public void setSsex(String ssex) { this.ssex = ssex; } public int getSid() { return sid; } public String getSname() { return sname; } public String getSsex() { return ssex; }}
3.JSON解析我使用的是阿里巴巴研发的解析
核心处理:
- package com.example.android31_xmlorjson;
- 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 com.alibaba.fastjson.JSON;
- import org.xmlpull.v1.XmlPullParser;
- import org.xmlpull.v1.XmlPullParserException;
- import java.io.IOException;
- import java.io.InputStream;
- import java.net.HttpURLConnection;
- import java.net.MalformedURLException;
- import java.net.URL;
- import java.util.List;
- public class MainActivity extends AppCompatActivity {
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_main);
- }
- public void getNetXml(View view){
- new MyXmlTask().execute();
- }
- //异步获取网络xml
- class MyXmlTask extends AsyncTask{
- @Override
- protected Object doInBackground(Object[] objects) {
- //获取网络数据
- String path=”http://192.168.43.210:8080/student.xml”;
- try {
- URL url=new URL(path);
- HttpURLConnection connection= (HttpURLConnection) url.openConnection();
- //设置请求方式(一般提交数据使用POST,获取数据使用GET)
- connection.setRequestMethod(”GET”);
- //设置请求时间
- connection.setConnectTimeout(5000);
- //获取结果码
- int code=connection.getResponseCode();
- if(200==code){
- InputStream is=connection.getInputStream();//获取读流
- //打印自己的结果
- // int len=0;
- // byte[] buf=new byte[1024];
- //StringBuffer stringBuffer=new StringBuffer();
- // while((len=is.read(buf))!=-1){
- // String s=new String(buf,0,len);
- // stringBuffer.append(s);
- // }
- //Log.i(“test”,stringBuffer.toString());
- //解析XML (我们使用Android特有的pull解析)
- //实例化解析器
- XmlPullParser pullParser= Xml.newPullParser();
- //进行解析 (参数一:数据源(网络流);参数二:编码方式)
- pullParser.setInput(is,”UTF-8”);
- //解析标签类型
- int type=pullParser.getEventType();
- while(type!=XmlPullParser.END_DOCUMENT){ //判断不是结束标签
- switch (type){
- case XmlPullParser.START_TAG:
- //获取开始标签的名字
- String starTagName=pullParser.getName();
- if(“student”.equals(starTagName)){
- //获取属性值id的值
- String sid=pullParser.getAttributeName(0);
- Log.i(”test”,“”+sid);
- } else if(“sname”.equals(starTagName)){
- String sname=pullParser.nextText();
- Log.i(”test”,“”+sname);
- } else if(“sage”.equals(starTagName)){
- String sage=pullParser.nextText();
- Log.i(”test”,“”+sage);
- }
- break;
- case XmlPullParser.END_TAG:
- break;
- }
- //细节
- type=pullParser.next();
- }
- //关闭流
- is.close();
- }
- } catch (MalformedURLException e) {
- e.printStackTrace();
- } catch (IOException e) {
- e.printStackTrace();
- } catch (XmlPullParserException e) {
- e.printStackTrace();
- }
- return null;
- }
- @Override
- protected void onPostExecute(Object o) {
- super.onPostExecute(o);
- }
- }
- public void getNetJSON(View view){
- new MyJsonTask().execute();
- }
- //异步获取网络Json
- class MyJsonTask extends AsyncTask{
- @Override
- protected Object doInBackground(Object[] objects) {
- //获取网络Json
- String path=”http://192.168.43.210:8080/students.json”;
- try {
- URL url=new URL(path);
- HttpURLConnection connection= (HttpURLConnection) url.openConnection();
- connection.setRequestMethod(”GET”);
- connection.setConnectTimeout(5000);
- if(connection.getResponseCode()==200){
- InputStream is=connection.getInputStream();
- int len=0;
- byte[] buf= new byte[1024];
- StringBuffer sb=new StringBuffer();
- while ((len=is.read(buf))!=-1){
- String s=new String(buf,0,len);
- sb.append(s);
- }
- //输出打印
- Log.i(”test”,sb.toString());
- //解析JSON’
- BigObject bigObject=JSON.parseObject(sb.toString(),BigObject.class);
- int count=bigObject.getCount();
- Log.i(”test”,count+“”);
- List<Student> stuList=bigObject.getStudents();
- for (Student sss : stuList) {
- Log.i(”test”,sss.getSname()+“ ”+sss.getSsex());
- }
- }
- } catch (MalformedURLException e) {
- e.printStackTrace();
- } catch (IOException e) {
- e.printStackTrace();
- }
- return null;
- }
- @Override
- protected void onPostExecute(Object o) {
- super.onPostExecute(o);
- }
- }
- }
package com.example.android31_xmlorjson;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 com.alibaba.fastjson.JSON;import org.xmlpull.v1.XmlPullParser;import org.xmlpull.v1.XmlPullParserException;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.util.List;public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } public void getNetXml(View view){ new MyXmlTask().execute(); } //异步获取网络xml class MyXmlTask extends AsyncTask{ @Override protected Object doInBackground(Object[] objects) { //获取网络数据 String path="http://192.168.43.210:8080/student.xml"; try { URL url=new URL(path); HttpURLConnection connection= (HttpURLConnection) url.openConnection(); //设置请求方式(一般提交数据使用POST,获取数据使用GET) connection.setRequestMethod("GET"); //设置请求时间 connection.setConnectTimeout(5000); //获取结果码 int code=connection.getResponseCode(); if(200==code){ InputStream is=connection.getInputStream();//获取读流 //打印自己的结果 // int len=0;// byte[] buf=new byte[1024]; //StringBuffer stringBuffer=new StringBuffer();// while((len=is.read(buf))!=-1){// String s=new String(buf,0,len);// stringBuffer.append(s);// } //Log.i("test",stringBuffer.toString()); //解析XML (我们使用Android特有的pull解析) //实例化解析器 XmlPullParser pullParser= Xml.newPullParser(); //进行解析 (参数一:数据源(网络流);参数二:编码方式) pullParser.setInput(is,"UTF-8"); //解析标签类型 int type=pullParser.getEventType(); while(type!=XmlPullParser.END_DOCUMENT){ //判断不是结束标签 switch (type){ case XmlPullParser.START_TAG: //获取开始标签的名字 String starTagName=pullParser.getName(); if("student".equals(starTagName)){ //获取属性值id的值 String sid=pullParser.getAttributeName(0); Log.i("test",""+sid); } else if("sname".equals(starTagName)){ String sname=pullParser.nextText(); Log.i("test",""+sname); } else if("sage".equals(starTagName)){ String sage=pullParser.nextText(); Log.i("test",""+sage); } break; case XmlPullParser.END_TAG: break; } //细节 type=pullParser.next(); } //关闭流 is.close(); } } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } catch (XmlPullParserException e) { e.printStackTrace(); } return null; } @Override protected void onPostExecute(Object o) { super.onPostExecute(o); } } public void getNetJSON(View view){ new MyJsonTask().execute(); } //异步获取网络Json class MyJsonTask extends AsyncTask{ @Override protected Object doInBackground(Object[] objects) { //获取网络Json String path="http://192.168.43.210:8080/students.json"; try { URL url=new URL(path); HttpURLConnection connection= (HttpURLConnection) url.openConnection(); connection.setRequestMethod("GET"); connection.setConnectTimeout(5000); if(connection.getResponseCode()==200){ InputStream is=connection.getInputStream(); int len=0; byte[] buf= new byte[1024]; StringBuffer sb=new StringBuffer(); while ((len=is.read(buf))!=-1){ String s=new String(buf,0,len); sb.append(s); } //输出打印 Log.i("test",sb.toString()); //解析JSON' BigObject bigObject=JSON.parseObject(sb.toString(),BigObject.class); int count=bigObject.getCount(); Log.i("test",count+""); List<Student> stuList=bigObject.getStudents(); for (Student sss : stuList) { Log.i("test",sss.getSname()+" "+sss.getSsex()); } } } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return null; } @Override protected void onPostExecute(Object o) { super.onPostExecute(o); } }}
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