网络通信之xml解析和json解析

我们可以来一个Tomcat来测试一下。

1、打开Tomcat在webapps=》ROOT文件中，新建一个xml，一定要另保存为UTF-8，不然会出现乱码问题，还有可能后面的结果有问题。

2、打开浏览器输入ip地址再：自己的Tomca端口号，测试有没有出来官网，之后再斜杠/xml名字.xml，如果出来内容就是对的了。

之后我们在Android Studio中就直接上代码了。

xml配置文件的权限一定要加，因为今天要运用到网络拿数据。

xml解析：

权限：

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

xml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"
tools:context="com.zking.laci.android29_alarm.MainActivity"
android:orientation="vertical"
>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="获得xml数据"
android:onClick="getNet"
/>

</LinearLayout>

java代码：

package com.zking.laci.android29_alarm;

import android.app.TimePickerDialog;
import android.os.AsyncTask;
import android.support.v4.animation.ValueAnimatorCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.util.Xml;
import android.view.View;
import android.widget.TimePicker;

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.net.URLConnection;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}

public void getNet(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://192.168.56.1:8080/students.xml";
try {
URL url=new URL(path);
//拿数据
HttpURLConnection connection= (HttpURLConnection) url.openConnection();
//设置请求方式
connection.setRequestMethod("GET");
//设置请求超过的时间
connection.setConnectTimeout(5000);
//获取结果码
int code=connection.getResponseCode();
if(code==200){
//获取数据
InputStream is=connection.getInputStream();
//解析xml PULL
XmlPullParser pullParser=Xml.newPullParser();
pullParser.setInput(is,"UTF-8");
//解析标签类型
int type=pullParser.getEventType();
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id的值
String sid=pullParser.getAttributeValue(0);
Log.i("test",sid+"");
}else if("sname".equals(startTagName)){
String sname=pullParser.nextText();
Log.i("test",sname+"sname");
}else if("sage".equals(startTagName)){
String sage=pullParser.nextText();
Log.i("test",sage+"");
}
break;
case XmlPullParser.END_TAG:
break;
4000

}
//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);
}
}
}

json解析：

在解析之前要导入一个fastjson-1.2.3.jar的jar包，放入libs中，就可以了。

然后就是xml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"
tools:context="com.zking.laci.android29_alarm.MainActivity"
android:orientation="vertical"
>

<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="获得json数据"
android:onClick="getjson"
/>

</LinearLayout>

java:

package com.zking.laci.android29_alarm;

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 getjson(View view){
new MyJsonTask().execute();
}
class MyJsonTask extends AsyncTask{

@Override
protected void onPreExecute() {
pd.show();
super.onPreExecute();
}

@Override
protected Object doInBackground(Object[] params) {
//获取网络json数据
String path="http://192.168.56.1:8080/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[] b=new byte[1024];
StringBuffer sb=new StringBuffer();
while((len=is.read(b))!=-1){
String s=new String(b,0,len);
sb.append(s);
}
Log.i("test",sb.toString());
//解析json
BigObject bigObject=JSON.parseObject(sb.toString(),BigObject.class);
Log.i("test",bigObject.getCount()+"");

List<Student> students=bigObject.getStudents();
for (Student student : students) {
Log.i("test",student.getSname());
}

}

} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}

return null;
}

@Override
protected void onPostExecute(Object o) {
pd.cancel();
super.onPostExecute(o);
}
}