原生JSON解析

原生JSON解析

JSONObject：JSON数据封装对象
JSONArray：JSON数据封装数组

布局：

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout
     android:orientation="vertical"
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     tools:context="net.bwie.jsonobject.MainActivity">

     <Button
         android:id="@+id/read_file_btn"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="读取文件中的json数据"/>

     <Button
         android:id="@+id/parse_btn"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="解析json数据"/>

     <TextView
         android:id="@+id/result_tv"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="Hello World!"/>

 </LinearLayout>

Bean:

 package net.bwie.jsonobject;

 import java.util.List;

 public class ShoppingBean {

     private String msg;
     private InfoBean info;

     public String getMsg() {
         return msg;
     }

     public void setMsg(String msg) {
         this.msg = msg;
     }

     public InfoBean getInfo() {
         return info;
     }

     public void setInfo(InfoBean info) {
         this.info = info;
     }

     @Override
     public String toString() {
         return "ShoppingBean{" +
                 "msg='" + msg + '\'' +
                 ", info=" + info +
                 '}';
     }

     public static class InfoBean {

         private int cat_id;
         private List<GoodsBean> good;
         private boolean url;

         public int getCat_id() {
             return cat_id;
         }

         public void setCat_id(int cat_id) {
             this.cat_id = cat_id;
         }

         public List<GoodsBean> getGood() {
             return good;
         }

         public void setGood(List<GoodsBean> good) {
             this.good = good;
         }

         public boolean isUrl() {
             return url;
         }

         public void setUrl(boolean url) {
             this.url = url;
         }

         @Override
         public String toString() {
             return "InfoBean{" +
                     "cat_id=" + cat_id +
                     ", good=" + good +
                     ", url=" + url +
                     '}';
         }

         public static class GoodsBean {

             private long add_time;
             private String colorcode;
             private String currency_price;
             private String description;
             private String goods_id;
             private String goods_name;
             private String thumb;

             public long getAdd_time() {
                 return add_time;
             }

             public void setAdd_time(long add_time) {
                 this.add_time = add_time;
             }

             public String getColorcode() {
                 return colorcode;
             }

             public void setColorcode(String colorcode) {
                 this.colorcode = colorcode;
             }

             public String getCurrency_price() {
                 return currency_price;
             }

             public void setCurrency_price(String currency_price) {
                 this.currency_price = currency_price;
             }

             public String getDescription() {
                 return description;
             }

             public void setDescription(String description) {
                 this.description = description;
             }

             public String getGoods_id() {
                 return goods_id;
             }

             public void setGoods_id(String goods_id) {
                 this.goods_id = goods_id;
             }

             public String getGoods_name() {
                 return goods_name;
             }

             public void setGoods_name(String goods_name) {
                 this.goods_name = goods_name;
             }

             public String getThumb() {
                 return thumb;
             }

             public void setThumb(String thumb) {
                 this.thumb = thumb;
             }

             @Override
             public String toString() {
                 return "GoodsBean{" +
                         "add_time=" + add_time +
                         ", colorcode='" + colorcode + '\'' +
                         ", currency_price='" + currency_price + '\'' +
                         ", description='" + description + '\'' +
                         ", goods_id='" + goods_id + '\'' +
                         ", goods_name='" + goods_name + '\'' +
                         ", thumb='" + thumb + '\'' +
                         '}';
             }
         }

     }

 }

Activity:

 /**
  * 1、将json文件存在外部存储中，使用IO流读取文件中的数据
  * 2、使用JSONObject解析读取出来的数据
  */
 public class MainActivity extends AppCompatActivity implements View.OnClickListener {

     private String mJson = "";

     protected Button mReadFileBtn;
     protected Button mParseBtn;
     protected TextView mResultTv;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         super.setContentView(R.layout.activity_main);
         initView();
     }

     @Override
     public void onClick(View view) {
         if (view.getId() == R.id.read_file_btn) {
             readFile();
         } else if (view.getId() == R.id.parse_btn) {
             ShoppingBean shopping = parseJson();
             Log.d("1507", "" + shopping);
         }
     }

     // 解析JSON数据
     // 遇到{}就创建JSONObject，遇到[]就创建JSONArray
     private ShoppingBean parseJson() {
         ShoppingBean shopping = null;
         try {
             JSONObject rootObject = new JSONObject(mJson);
          shopping = new ShoppingBean();

             String msg = rootObject.getString("msg");
             shopping.setMsg(msg);

             JSONObject infoObject = rootObject.getJSONObject("info");
             ShoppingBean.InfoBean info = new ShoppingBean.InfoBean();
             shopping.setInfo(info);

             int catId = infoObject.getInt("cat_id");
             info.setCat_id(catId);

             boolean url = infoObject.getBoolean("url");
             info.setUrl(url);

             JSONArray goodsArray = infoObject.getJSONArray("goods");
             List<ShoppingBean.InfoBean.GoodsBean> goodsList = new ArrayList<>();
             info.setGood(goodsList);

             for (int i = 0; i < goodsArray.length(); i++) {
                 JSONObject goodsObject = goodsArray.getJSONObject(i);
                 ShoppingBean.InfoBean.GoodsBean goods = new ShoppingBean.InfoBean.GoodsBean();

                 long addTime = goodsObject.getLong("add_time");
                 goods.setAdd_time(addTime);

                 String colorCode = goodsObject.getString("colorcode");
                 goods.setColorcode(colorCode);

                 String currencyPrice = goodsObject.getString("currency_price");
                 goods.setCurrency_price(currencyPrice);

                 String description = goodsObject.getString("description");
                 goods.setDescription(description);

                 String goodsName = goodsObject.getString("goods_name");
                 goods.setGoods_name(goodsName);

                 String thumb = goodsObject.getString("thumb");
                 goods.setThumb(thumb);

                 goodsList.add(goods);
             }

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

         return shopping;

     }

     // 读取文件中的JSON数据
     private void readFile() {
         // 根目录
         // Environment.getExternalStorageDirectory()

         // 外部存储公共路径，例如：DCIM，DOWNLOADS等系统提供的文件夹
 //        Environment.getExternalStoragePublicDirectory(类型)

         // 外部存储私有路径：Android文件夹
 //        context.getExternalFilesDir(null)

         // downloads文件夹路径
         String filePath = Environment
                 .getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS)
                 .getAbsolutePath();
         String fileName = "json.txt";

         File file = new File(filePath, fileName);

         // 文件字符输入流
         // 字缓符输入冲流
         BufferedReader br = null;
         try {
             br = new BufferedReader(new FileReader(file));
             String line = new String();
             while ((line = br.readLine()) != null) {
                 mJson += line;
             }
             if (mJson != null) {
                 mResultTv.setText(mJson);
             }
         } catch (Exception e) {
             e.printStackTrace();
         } finally {
             try {
                 br.close();
             } catch (IOException e) {
                 e.printStackTrace();
             }
         }
     }

     private void initView() {
         mReadFileBtn = (Button) findViewById(R.id.read_file_btn);
         mReadFileBtn.setOnClickListener(MainActivity.this);
         mParseBtn = (Button) findViewById(R.id.parse_btn);
         mParseBtn.setOnClickListener(MainActivity.this);
         mResultTv = (TextView) findViewById(R.id.result_tv);
     }
 }

权限：

  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>