Json和Xml解析
1.XML解析
package com.example.exercise3;
public class City {
private int id;
private String temp;
private String weather;
private String name;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
private String pm;
private String wind;
public String getTemp() {
return temp;
}
public void setTemp(String temp) {
this.temp = temp;
}
public String getWeather() {
return weather;
}
public void setWeather(String weather) {
this.weather = weather;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPm() {
return pm;
}
public void setPm(String pm) {
this.pm = pm;
}
public String getWind() {
return wind;
}
public void setWind(String wind) {
this.wind = wind;
}
@Override
public String toString() {
return
"temp='" + temp + '\'' +
", pm='" + pm + '\'' +
", wind='" + wind + '\'';
}
}
weather.xml
<?xml version="1.0" encoding="utf-8"?>
<infos>
<city id="1">
<temp>20℃/30℃</temp>
<weather>晴天多云</weather>
<name>上海</name>
<pm>80</pm>
<wind>1级</wind>
</city>
<city id="2">
<temp>26℃/32℃</temp>
<weather>晴天</weather>
<name>北京</name>
<pm>98</pm>
<wind>3级</wind>
</city>
<city id="3">
<temp>15℃/24℃</temp>
<weather>多云</weather>
<name>广州</name>
<pm>30</pm>
<wind>5级</wind>
</city>
</infos>
<?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"
android:background="@drawable/weather"
tools:context=".XML">
<TextView
android:id="@+id/xml_city_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="50dp"
android:textSize="60dp" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<ImageView
android:id="@+id/xml_weather_img"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="100dp"
/>
<TextView
android:id="@+id/xml_weather_info"
android:layout_marginLeft="20dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20dp"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:orientation="horizontal"
android:layout_marginTop="-80dp"
android:layout_height="wrap_content">
<Button
android:id="@+id/xml_beijing"
android:layout_marginLeft="20dp"
android:layout_marginTop="280dp"
android:layout_width="wrap_content"
android:layout_height="80dp"
android:textSize="40dp"
android:text="北京"/>
<Button
android:id="@+id/xml_shanghai"
android:layout_marginLeft="20dp"
android:layout_marginTop="280dp"
android:layout_width="wrap_content"
android:layout_height="80dp"
android:textSize="40dp"
android:text="上海"/>
<Button
android:id="@+id/xml_guangzhou"
android:layout_marginLeft="20dp"
android:layout_marginTop="280dp"
android:layout_width="wrap_content"
android:layout_height="80dp"
android:textSize="40dp"
android:text="广州"/>
</LinearLayout>
</LinearLayout>
package com.example.exercise3;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import org.xmlpull.v1.XmlPullParserException;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
public class XML extends AppCompatActivity implements View.OnClickListener {
private TextView xml_city_name,xml_weaher_info;
private Button xml_beijing,xml_shanghai,xml_guangzhou;
private ImageView xml_weather_img;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_xml);
init();
}
private void init() {
xml_city_name= findViewById(R.id.xml_city_name);
xml_weaher_info=findViewById(R.id.xml_weather_info);
xml_weather_img=findViewById(R.id.xml_weather_img);
xml_beijing=(Button)findViewById(R.id.xml_beijing);
xml_guangzhou=(Button)findViewById(R.id.xml_guangzhou);
xml_shanghai=(Button)findViewById(R.id.xml_shanghai);
xml_beijing.setOnClickListener(this);
xml_guangzhou.setOnClickListener(this);
xml_shanghai.setOnClickListener(this);
xml_city_name.setText("北京");
xml_weaher_info.setText("晴 26℃/32℃ 98 3级");
xml_weather_img.setImageResource(R.drawable.sun);
}
@Override
public void onClick(View view) {
//XML关键代码
InputStream xml=this.getClass().getClassLoader().getResourceAsStream("assets/weather.xml");
List<City> cities=null;
try{
cities=CityService.getCitys(xml);
}catch (IOException e)
{
e.printStackTrace();
}catch (XmlPullParserException e)
{
e.printStackTrace();
}
switch (view.getId())
{
case R.id.xml_beijing:
for(City city:cities)
{
if(city.getId()==2)
{
xml_city_name.setText(city.getName());
xml_weaher_info.setText(city.toString());
xml_weather_img.setImageResource(R.drawable.sun);
}
}
break;
case R.id.xml_shanghai:
for(City city:cities)
{
if(city.getId()==1)
{
xml_city_name.setText(city.getName());
xml_weaher_info.setText(city.toString());
xml_weather_img.setImageResource(R.drawable.cloud_sun);
}
}
Log.e(null,"test");
break;
case R.id.xml_guangzhou:
for(City city:cities)
{
if(city.getId()==3)
{
xml_city_name.setText(city.getName());
xml_weaher_info.setText(city.toString());
xml_weather_img.setImageResource(R.drawable.cloud_sun);
}
}
Log.e(null,"test");
break;
default:break;
}
}
}
解析City
package com.example.exercise3;
import android.util.Xml;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
public class CityService {
public static List<City> getCitys(InputStream xml) throws IOException, XmlPullParserException
{
List<City> citys=null;
City city=null;
XmlPullParser pullParser= Xml.newPullParser();
try {
pullParser.setInput(xml,"UTF-8");
int event=pullParser.getEventType();
while (event!=XmlPullParser.END_DOCUMENT)
{
switch (event)
{
case XmlPullParser.START_DOCUMENT:
citys=new ArrayList<City>();
break;
case XmlPullParser.START_TAG:
if("city".equals(pullParser.getName()))
{
int id=new Integer(pullParser.getAttributeValue(0));
city=new City();
city.setId(id);
}
if("temp".equals(pullParser.getName()))
{
String temp=pullParser.nextText();
city.setTemp(temp);
}
if("weather".equals(pullParser.getName()))
{
String weather=pullParser.nextText();
city.setWeather(weather);
}
if("name".equals(pullParser.getName()))
{
String name=pullParser.nextText();
city.setName(name);
}
if("pm".equals(pullParser.getName()))
{
String pm=pullParser.nextText();
city.setPm(pm);
}
if("wind".equals(pullParser.getName()))
{
String wind=pullParser.nextText();
city.setWind(wind);
}
break;
case XmlPullParser.END_TAG:
if("city".equals(pullParser.getName()))
{
citys.add(city);
city=null;
}
break;
}
event=pullParser.next();
}
}catch (XmlPullParserException e)
{
e.printStackTrace();
}
return citys;
}
}
2.JSON解析
package com.example.exercise3;
import android.content.Context;
import android.content.res.AssetManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.reflect.Type;
import java.util.LinkedList;
public class JSON extends AppCompatActivity implements View.OnClickListener {
private TextView json_city_name,json_weaher_info;
private Button json_beijing,json_shanghai,json_guangzhou;
private ImageView json_weather_img;
FileReader reader=null;
LinkedList<City> cities;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_json);
init();
ReadJson();
}
//JSON关键代码
**//这是一个方法，其中filename是放在assets中的本地JSON文件名
public static String getJson(String fileName, Context context){
//这个用来保存JSON格式字符串，字符缓冲流
StringBuilder stringBuilder = new StringBuilder();
AssetManager assetManager = context.getAssets();
try{
BufferedReader bf=new BufferedReader(new InputStreamReader(assetManager.open(fileName)));
String line;
while ((line=bf.readLine())!=null){
stringBuilder.append(line);
}
} catch (IOException e) {
e.printStackTrace();
}
return stringBuilder.toString();
}**
private LinkedList<City> ReadJson() {
String result = getJson("weather.json",this);
Type listType=new TypeToken<LinkedList<City>>(){}.getType();
Gson gson=new Gson();
cities=gson.fromJson(result,listType);
for(City city:cities)
{
Log.e(null,city.toString());
}
return cities;
}
private void init() {
json_city_name= findViewById(R.id.json_city_name);
json_weaher_info=findViewById(R.id.json_weather_info);
json_weather_img=findViewById(R.id.json_weather_img);
json_beijing=findViewById(R.id.json_beijing);
json_guangzhou=findViewById(R.id.json_guangzhou);
json_shanghai=findViewById(R.id.json_shanghai);
json_beijing.setOnClickListener(this);
json_guangzhou.setOnClickListener(this);
json_shanghai.setOnClickListener(this);
json_city_name.setText("北京");
json_weaher_info.setText("晴 26℃/32℃ 98 3级");
json_weather_img.setImageResource(R.drawable.sun);
}
@Override
public void onClick(View view) {
switch (view.getId())
{
case R.id.json_beijing:
for(City city:cities)
{
if(city.getId()==1)
{
json_city_name.setText(city.getName());
json_weaher_info.setText(city.toString());
json_weather_img.setImageResource(R.drawable.sun);
}
}
break;
case R.id.json_shanghai:
for(City city:cities)
{
if(city.getId()==2)
{
json_city_name.setText(city.getName());
json_weaher_info.setText(city.toString());
json_weather_img.setImageResource(R.drawable.sun);
}
}
break;
case R.id.json_guangzhou:
for(City city:cities)
{
if(city.getId()==3)
{
json_city_name.setText(city.getName());
json_weaher_info.setText(city.toString());
json_weather_img.setImageResource(R.drawable.sun);
}
}
break;
default:break;
}
}
}
JSON文件
[
{"id":2,"temp":"20℃/30℃","weather":"晴转多云","name":"上海","pm":"80","wind":"1级"},
{"id":1,"temp":"15℃/24℃","weather":"晴","name":"北京","pm":"98","wind":"3级"},
{"id":3,"temp":"26℃/32℃","weather":"多云","name":"广州","pm":"30","wind":"2级"}
]
运行效果