使用Gson解析数据

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1.解析普通的json对象

package com.studio.imoocdemo;import android.os.Handler;import android.os.Message;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.widget.TextView;import com.google.gson.Gson;import org.json.JSONException;import org.json.JSONObject;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;public class DetailActivity extends AppCompatActivity {    private TextView nameView, authorView, contentView;    private Handler handler = new Handler() {        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);            Essay essay = (Essay) msg.obj;            nameView.setText(essay.getTitle());            authorView.setText(essay.getAuthor());            contentView.setText(essay.getContent());        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_detail);        initView();        initData();    }    public void initView() {        nameView = (TextView) findViewById(R.id.name);        authorView = (TextView) findViewById(R.id.author);        contentView = (TextView) findViewById(R.id.content);    }    public void initData() {        //HttpUrlConnection        /**         * 1.实例化一个url对象         * 2.获取HttpUrlConnection对象         * 3.设置请求连接属性         * 4.获取相应码，判断是否连接成功         * 5.读取输入流并解析         */        //参数：你要访问的接口地址        new Thread() {            @Override            public void run() {                super.run();                try {                    URL url = new URL("http://www.imooc.com/api/teacher?type=3&cid=1");                    HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();                    httpURLConnection.setRequestMethod("GET");                    httpURLConnection.setReadTimeout(6000);                    //获取相应码                    if (httpURLConnection.getResponseCode() == 200) {                        //获取输入流                        InputStream inputStream = httpURLConnection.getInputStream();                        byte[] bytes = new byte[1024 * 512];                        int len = 0;                        //建立缓存流，保存所读取的字节数组                        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();                        while ((len = inputStream.read(bytes)) > -1) {                            byteArrayOutputStream.write(bytes, 0, len);                        }                        String msg = byteArrayOutputStream.toString();                        Log.e("TAG", msg);                        //JSON数据的解析：                        JSONObject jsonObject = new JSONObject(msg);                        int status = jsonObject.getInt("status");                        String msg2 = jsonObject.getString("msg");                        Log.e("TAG", status + "  " + msg2);                        //创建Gson对象                        Gson gson = new Gson();                        //参数1：满足json对象格式的字符串                        String data = jsonObject.getString("data");                        Essay e = gson.fromJson(data, Essay.class);                        //将操作权交还给主线程                        Message message = handler.obtainMessage();                        message.obj = e;                        //调用此方法，则会触发主线程中handler对象里重写的handleMessage方法                        handler.sendMessage(message);                    }                } catch (MalformedURLException e) {                    e.printStackTrace();                } catch (IOException e) {                    e.printStackTrace();                } catch (JSONException e) {                    e.printStackTrace();                }            }        }.start();    }}

2.解析json数组

这里写图片描述

Outline.java

package com.studio.imoocdemo;public class Outline {    private int id;    private String name;    private String picSmall;    private String picBid;    private String description;    private String learner;    public Outline(int id, String name, String picSmall, String picBid, String description, String learner) {        this.id = id;        this.name = name;        this.picSmall = picSmall;        this.picBid = picBid;        this.description = description;        this.learner = learner;    }    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public String getPicSmall() {        return picSmall;    }    public void setPicSmall(String picSmall) {        this.picSmall = picSmall;    }    public String getPicBid() {        return picBid;    }    public void setPicBid(String picBid) {        this.picBid = picBid;    }    public String getDescription() {        return description;    }    public void setDescription(String description) {        this.description = description;    }    public String getLearner() {        return learner;    }    public void setLearner(String learner) {        this.learner = learner;    }}

package com.studio.imoocdemo;import android.app.Activity;import android.content.Intent;import android.renderscript.ScriptIntrinsicYuvToRGB;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;import com.google.gson.Gson;import com.google.gson.reflect.TypeToken;import org.json.JSONArray;import org.json.JSONException;import org.json.JSONObject;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.util.ArrayList;public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initview();        initData();    }    public void initview() {        findViewById(R.id.header).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                startActivity(new Intent(MainActivity.this, DetailActivity.class));            }        });    }    public void initData() {        new Thread() {            @Override            public void run() {                super.run();                try {                    URL url = new URL("http://www.imooc.com/api/teacher?type=2");                    HttpURLConnection conn = (HttpURLConnection) url.openConnection();                    conn.setRequestMethod("GET");                    conn.setReadTimeout(6000);                    if (conn.getResponseCode() == 200) {                        InputStream in = conn.getInputStream();                        byte[] b = new byte[1024 * 512];                        int len = 0;                        ByteArrayOutputStream baos = new ByteArrayOutputStream();                        while ((len = in.read(b)) > -1) {                            baos.write(b, 0, len);                        }                        String result = baos.toString();                        Log.e("TAG", result);                        String data = new JSONObject(result).getString("data");                        //Gson                        //1.解析普通的json对象                        //2.解析json数组                        Gson gson = new Gson();                        //参数1：满足json数组形式的字符串                        //参数2：Type对象,泛型将会决定你的json字符串最后被转化成的类型                        ArrayList<Outline> outlines = gson.fromJson(data, new TypeToken<ArrayList<Outline>>() {                        }.getType());                        for (int i = 0; i < outlines.size(); i++) {                            Outline o = outlines.get(i);                            Log.e("TAG", "id:" + o.getId() + ",标题:" + o.getName());                        }                    }                } catch (MalformedURLException e) {                    e.printStackTrace();                } catch (IOException e) {                    e.printStackTrace();                } catch (JSONException e) {                    e.printStackTrace();                }            }        }.start();    }}

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