網(wǎng)絡基礎：

1. http方式訪問網(wǎng)絡
2. okhttp方式訪問網(wǎng)絡
3. pull方式解析xml數(shù)據(jù)
4. SAX方式解析xml數(shù)據(jù)
   5.JSONObject方式解析json數(shù)據(jù)
   6.GSON方式解析數(shù)據(jù)

布局文件

<Button
        android:id="@+id/send_request"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="sendRequest"/>

    <TextView
        android:id="@+id/response_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

http方式訪問網(wǎng)絡

private void sendRequestWithHttp() {

        new Thread(new Runnable() {
            @Override
            public void run() {
                HttpURLConnection connection = null;
                BufferedReader reader = null;
                try {
                    URL url = new URL("https://www.baidu.com");
                    connection = (HttpURLConnection) url.openConnection();
                    connection.setRequestMethod("GET");
                    connection.setReadTimeout(8000);
                    connection.setConnectTimeout(8000);
                    InputStream in = connection.getInputStream();
                    reader = new BufferedReader(new InputStreamReader(in));
                    StringBuilder response = new StringBuilder();
                    String line;
                    while ((line = reader.readLine()) !=null){
                        response.append(line);
                    }
                    showResponse(response.toString());
                } catch (Exception e) {
                    e.printStackTrace();
                }finally {
                    if (reader != null){
                        try {
                            reader.close();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }
                    if (connection != null){
                        connection.disconnect();
                    }
                }

            }
        }).start();
    }

okhttp方式

private void sendRequestWithOkHttp() {
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    OkHttpClient client = new OkHttpClient();
                    Request request = new Request.Builder().url("http://10.0.2.2./get_data.xml").build();
                    Response response = client.newCall(request).execute();
                    String data = response.body().string();
                    //showResponse(data);
                    //XMLWithPull(data);
                    //XMLWithSAX(data);
                    //JSONWithJSONObject(data);
                    JSONWithGson(data);

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

            }
        }).start();
    }

解析xml數(shù)據(jù)pull方式

//解析XML文件pull方式
    private void XMLWithPull(String data) {
        try {
            XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
            XmlPullParser parser = factory.newPullParser();
            parser.setInput(new StringReader(data));
            int eventType = parser.getEventType();
            String id = "";
            String name = "";
            String version = "";
            while(eventType != parser.END_DOCUMENT){
                String nodeName = parser.getName();
                switch (eventType){
                    case XmlPullParser.START_TAG:
                        if ("id".equals(nodeName))
                            id = parser.nextText();
                        if ("name".equals(nodeName))
                            name = parser.nextText();
                        if ("version".equals(nodeName))
                            version = parser.nextText();
                        break;
                    case XmlPullParser.END_TAG:
                        break;
                    default:
                }
                eventType = parser.next();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

解析xml數(shù)據(jù)SAX方式

package com.example.bbw.networkdemo;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;


/**
 * Created by bbw on 2017/7/23.
 */

public class ContentHandler extends DefaultHandler {

    private String nodeName;
    private StringBuilder id;
    private StringBuilder name;
    private StringBuilder version;


    //開始解析
    @Override
    public void startDocument() throws SAXException {
        id = new StringBuilder();
        name = new StringBuilder();
        version = new StringBuilder();
    }

    @Override
    public void endDocument() throws SAXException {
        super.endDocument();
    }

    //開始解析某節(jié)點
    @Override
    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
        nodeName = localName;
    }

    @Override
    public void endElement(String uri, String localName, String qName) throws SAXException {
        super.endElement(uri, localName, qName);
    }

    //獲取節(jié)點中內容調用
    @Override
    public void characters(char[] ch, int start, int length) throws SAXException {
        if ("id".equals(nodeName))
            id.append(ch,start,length);
        else if ("name".equals(nodeName))
            name.append(ch,start,length);
        else if ("version".equals(nodeName))
            version.append(ch,start,length);
    }
}

//解析XML文件SAX方式
    private void XMLWithSAX(String data) {

        try {
            SAXParserFactory factory = SAXParserFactory.newInstance();
            XMLReader reader = factory.newSAXParser().getXMLReader();
            ContentHandler handler = new ContentHandler();
            reader.setContentHandler(handler);
            reader.parse(new InputSource(new StringReader(data)));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

解析json數(shù)據(jù)jsonObject方式

//解析json文件jsonObject方式
    private void JSONWithJSONObject(String data) {

        try {
            JSONArray array = new JSONArray(data);
            for (int i=0;i<array.length();i++){
                JSONObject jsonObject = array.getJSONObject(i);
                String id = jsonObject.getString("id");
                String name = jsonObject.getString("name");
                String version = jsonObject.getString("version");
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }

    }

解析json數(shù)據(jù)GSON方式

package com.example.bbw.networkdemo;

/**
 * Created by bbw on 2017/7/23.
 */

public class bean {

    private String id;
    private String name;
    private String version;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getVersion() {
        return version;
    }

    public void setVersion(String version) {
        this.version = version;
    }
}

private void JSONWithGson(String data) {
        Gson gson = new Gson();
        List<bean> beanList = gson.fromJson(data,new TypeToken<List<bean>>(){}.getType());
        for (bean bean :beanList ){
            String id = bean.getId();
            String name = bean.getName();
            String version = bean.getVersion();
        }
    }