解析JSON

墨蓝 2022-06-12 14:36 234阅读 0赞

**运行截图**  
![这里写图片描述][SouthEast]  
![这里写图片描述][SouthEast 1]

**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>

[SouthEast]: /images/20220612/6624465c996940ac9c8bd90994b4ab07.png
[SouthEast 1]: /images/20220612/ec09cc7b820e4e188af6a89828bc2058.png