Android之xml解析和json解析

android之解析xml文件

1.我们先新建一个students.xml文件，把它放到Tomcat的root文件夹下，其内容如下：

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<?xml version="1.0" encoding="UTF-8"?>
<students>
<student sid="1">
<sname>大一sname>
<ssex>女ssex>
student>
<student sid="2">
<sname>小二sname>
<ssex>男ssex>
student>
<student sid="3">
<sname>张三sname>
<ssex>男ssex>
student>
students>

2.新建一个安卓项目

xml布局中写一个按钮调用getXMLByNet

Java文件中的代码如下：

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package com.example.cookie.android0726parsexml;
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 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 getXMLByNet(View view){
new MyTask().execute();
}
class MyTask extends AsyncTask {
@Override
protected Object doInBackground(Object[] params) {
//获取网络xml数据
String path="http://193.168.4.232:8080/students.xml";
try {
URL url= new URL(path);
HttpURLConnection connection= (HttpURLConnection) url.openConnection();
//设置请求方式
connection.setRequestMethod("GET");
//设置请求超时的时间
connection.setConnectTimeout(5000);
//获取结果码
int code=connection.getResponseCode();
if (code==200){
//获取数据
InputStream is=connection.getInputStream();
// 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());
//2.解析XML(PULL)
XmlPullParser pullParser=Xml.newPullParser();
pullParser.setInput(is,"UTF-8");
//解析的标签类型
int type=pullParser.getEventType();
// Log.i("test",type+"type");
while(type!=XmlPullParser.END_DOCUMENT){
switch (type) {
case XmlPullParser.START_TAG:
//获取开始标签的名字
String startTagName=pullParser.getName();
if ("student".equals(startTagName)){
//获取属性的ID值
String sid=pullParser.getAttributeValue(0);
Log.i("text"," "+ sid);
}else if("sname".equals(startTagName)){
String sname=pullParser.nextText();
Log.i("text"," "+ sname);
}else if("ssex".equals(startTagName)){
String ssex=pullParser.nextText();
Log.i("text"," "+ ssex);
}
break;
case XmlPullParser.END_TAG:
break;
}
//细节
type=pullParser.next();
}
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);
}
}
}

android之解析json

1.在Tomcat的root文件加下新建一个students.json文件

其演示代码如下：

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{"count":3,
"students":
[
{"sid":1,"sname":"么么","ssex":"男"},
{"sid":2,"sname":"妞妞","ssex":"女"},
{"sid":3,"sname":"皮皮","ssex":"男"}
]
}

2.在布局文件中写一个按钮调用方法

3.Java代码如下：

分析一下演示的JSON类，可以知道里面一个有2个对象

新建一个BigObject类，代码如下

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package com.example.cookie.android0726parsexml;
import java.util.List;
/**
* Created by Administrator on 2017/7/26 0026.
*/
public class BigObject {
private int count;
private List<Student> students;
public BigObject(int count, List<Student> students) {
this.count = count;
this.students = students;
}
public BigObject() {
}
public int getCount() {
return count;
}
public void setCount(int count) {
this.count = count;
}
public List<Student> getStudents() {
return students;
}
public void setStudents(List<Student> students) {
this.students = students;
}
}

新建一个Student类，其代码如下：

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package com.example.cookie.android0726parsexml;
/**
* 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 ssex) {
this.sid = sid;
this.sname = sname;
this.ssex = ssex;
}
public int getSid() {
return sid;
}
public void setSid(int sid) {
this.sid = sid;
}
public String getSname() {
return sname;
}
public void setSname(String sname) {
this.sname = sname;
}
public String getSsex() {
return ssex;
}
public void setSsex(String ssex) {
this.ssex = ssex;
}
}

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package com.example.cookie.android0726parsexml;
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 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 {
private ProgressDialog pd;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
pd = new ProgressDialog(this);
pd.setMessage("正在拼命加载中。。。。。。。。。。。");
}
public void getJsonByNet(View view){
new MyTaskNet().execute();
}
class MyTaskNet extends AsyncTask{
@Override
protected void onPreExecute() {
super.onPreExecute();
pd.show();
}
@Override
protected Object doInBackground(Object[] params) {
//获取网络JSON数据
String path="http://193.168.4.232:8080/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 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
BigObject bigObject=JSON.parseObject(stringBuffer.toString(),BigObject.class);
int count=bigObject.getCount();
Log.i("test","count:"+count);
List<Student> students=bigObject.getStudents();
for (Student student : students) {
Log.i("test",student.getSname()+" "+student.getSsex()+" "+student.getSname());
}
is.close();
}
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Object o) {
super.onPostExecute(o);
pd.cancel();
}
}
}

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