解析JSON

运行截图

MainActivity.java

package csdn.example.com.notification.NetWorkTest;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import org.json.JSONArray;
import org.json.JSONObject;
import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;

import java.io.IOException;
import java.io.StringReader;

import javax.xml.parsers.SAXParserFactory;

import csdn.example.com.notification.R;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

public class Main6Activity extends AppCompatActivity implements View.OnClickListener {
    TextView request_text;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main6);
        request_text = (TextView) findViewById(R.id.request_text);
        Button send_Request = (Button) findViewById(R.id.send_request);
        send_Request.setOnClickListener(this);

    }


    @Override
    public void onClick(View v) {
        if(v.getId() == R.id.send_request){
            Log.d("T","没毛病,老铁");
            //sendRequestWithHttpURLConnection();
            sendRequestWithOkHttp();
        }
    }

    private void sendRequestWithOkHttp() {
        new Thread(new Runnable() {
            @Override
            public void run() {

                try {
                    OkHttpClient client = new OkHttpClient();
                    Request request = new Request.Builder()
                            .url("http://10.7.90.163:8088/get_data.json")
                            .build();
                    Response response = client.newCall(request).execute();
                    String requestData = response.body().string();
                    //parseXMLWithPull(requestData);
                    //parseXMLWithSAX(requestData);
                    parseJSONWithJSONObject(requestData);
                    showResponse(requestData);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }).start();
    }

    private void parseJSONWithJSONObject(String jsonData) {
        try {
            JSONArray jsonArray = new JSONArray(jsonData);
            for(int i=0;i<jsonArray.length();i++){
                JSONObject jsonObject = jsonArray.getJSONObject(i);
                String id = jsonObject.getString("id");
                String name = jsonObject.getString("name");
                String version = jsonObject.getString("version");
                Log.i("Main6","id is "+id);
                Log.i("Main6","name is "+name);
                Log.i("Main6","version is "+version);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private void parseXMLWithSAX(String xmlData) {

        try {
            SAXParserFactory factory = SAXParserFactory.newInstance();
            XMLReader xmlReader = factory.newSAXParser().getXMLReader();
        ContentHandler handler = new ContentHandler();
            //将ContentGandler中的实例设置到XMLReader中
            xmlReader.parse(new InputSource(new StringReader(xmlData)));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }



    private void showResponse(final String response) {
       runOnUiThread(new Runnable() {
           @Override
           public void run() {
               Log.d("T","没毛病,老铁1"+response);
               request_text.setText(response);
           }
       });
    }
}

ContentHandler.java

package csdn.example.com.notification.NetWorkTest;

import android.util.Log;

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

/**
 * Created by 王德强 on 2017/7/24.
 */

public class ContentHandler extends DefaultHandler {
    private String nodeName;
    private StringBuilder id;
    private StringBuilder name;
    private StringBuilder version;

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

    @Override
    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
        //记录当前节点名
        nodeName = localName;
    }

    @Override
    public void characters(char[] ch, int start, int length) throws SAXException {
        //根据当前节点名判断将内容添加到哪一个StringBuilder对象中
        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);
        }
    }

    @Override
    public void endElement(String uri, String localName, String qName) throws SAXException {
        if("app".equals(localName)){
            Log.d("ContentHandler","id is "+id.toString().trim());
            Log.d("ContentHandler","name is "+name.toString().trim());
            Log.d("ContentHandler","version is "+version.toString().trim());
            //最后要将StringBuilder清空掉
            id.setLength(0);
            name.setLength(0);
            version.setLength(0);
        }
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/send_request"
        android:text="发送请求"
        />
    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/colorAccent"
        >
        <TextView
            android:background="@color/colorPrimary"
            android:id="@+id/request_text"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
    </ScrollView>
</LinearLayout>