使用Gson解析数据

时间：2022-06-04 13:00:08

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

使用Gson解析数据

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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