Android Fast Json 简单使用

1.Gradle依赖
2.Json转HashMap 例子
3.Json转实体类 例子

1.Gradle依赖

    //fastjson解析
    api 'com.alibaba:fastjson:1.2.59'

2.Json转HashMap 例子

• destination.json放在assets目录中

  
  image.png

• destination.json

{
  "main/tabs/sofa": {
    "isFragment": true,
    "asStarter": false,
    "needLogin": false,
    "pageUrl": "main/tabs/sofa",
    "className": "com.mooc.ppjoke.ui.sofa.SofaFragment",
    "id": 147242568
  }
}

• 通过GsonFormat转Java类

public class Destination {
    public String pageUrl;
    public int id;
    public boolean needLogin;
    public boolean asStarter;
    public boolean isFragment;
    public String className;
}

• AppConfig.java

public class AppConfig {
    private static HashMap<String, Destination> sDestConfig;
    public static HashMap<String, Destination> getDestConfig() {
        if (sDestConfig == null) {
            String content = parseFile("destination.json");
            sDestConfig = JSON.parseObject(content, new TypeReference<HashMap<String, Destination>>() {
            });
        }
        return sDestConfig;
    }

    private static String parseFile(String fileName) {
        AssetManager assets = AppGlobals.getApplication().getAssets();
        InputStream is = null;
        BufferedReader br = null;
        StringBuilder builder = new StringBuilder();
        try {
            is = assets.open(fileName);
            br = new BufferedReader(new InputStreamReader(is));
            String line = null;
            while ((line = br.readLine()) != null) {
                builder.append(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (is != null) {
                    is.close();
                }
                if (br != null) {
                    br.close();
                }
            } catch (Exception e) {

            }
        }

        return builder.toString();
    }
}

• AppGlobals.java

public class AppGlobals {
    private static Application sApplication;

    public static Application getApplication() {
        if (sApplication == null) {
            try {
                sApplication = (Application) Class.forName("android.app.ActivityThread")
                        .getMethod("currentApplication")
                        .invoke(null, (Object[]) null);
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            } catch (InvocationTargetException e) {
                e.printStackTrace();
            } catch (NoSuchMethodException e) {
                e.printStackTrace();
            } catch (ClassNotFoundException e) {
                e.printStackTrace();
            }
        }
        return sApplication;
    }
}

3.Json转实体类 例子

• main_tabs_config.json放在assets中

  
  image.png

• main_tabs_config.json

{
  "activeColor": "#333333",
  "inActiveColor": "#666666",
  "selectTab": 0,
  "tabs": [
    {
      "size": 24,
      "enable": true,
      "index": 0,
      "pageUrl": "main/tabs/home",
      "title": "首页"
    },
    {
      "size": 24,
      "enable": true,
      "index": 1,
      "pageUrl": "main/tabs/sofa",
      "title": "沙发"
    }
  ]
}

• 通过GsonFormat转Java类

public class BottomBar {

    /**
     * activeColor : #333333
     * inActiveColor : #666666
     * tabs : [{"size":24,"enable":true,"index":0,"pageUrl":"main/tabs/home","title":"首页"},{"size":24,"enable":true,"index":1,"pageUrl":"main/tabs/sofa","title":"沙发"},{"size":40,"enable":true,"index":2,"tintColor":"#ff678f","pageUrl":"main/tabs/publish","title":""},{"size":24,"enable":true,"index":3,"pageUrl":"main/tabs/find","title":"发现"},{"size":24,"enable":true,"index":4,"pageUrl":"main/tabs/my","title":"我的"}]
     */

    public String activeColor;
    public String inActiveColor;
    public List<Tab> tabs;
    public int selectTab;//底部导航栏默认选中项

    public static class Tab {
        /**
         * size : 24
         * enable : true
         * index : 0
         * pageUrl : main/tabs/home
         * title : 首页
         * tintColor : #ff678f
         */

        public int size;
        public boolean enable;
        public int index;
        public String pageUrl;
        public String title;
        public String tintColor;
    }
}

• AppConfig.java

public class AppConfig {
    private static BottomBar sBottomBar;
    public static BottomBar getBottomBarConfig() {
        if (sBottomBar == null) {
            String content = parseFile("main_tabs_config.json");
            sBottomBar = JSON.parseObject(content, BottomBar.class);
        }
        return sBottomBar;
    }
    private static String parseFile(String fileName) {
        AssetManager assets = AppGlobals.getApplication().getAssets();
        InputStream is = null;
        BufferedReader br = null;
        StringBuilder builder = new StringBuilder();
        try {
            is = assets.open(fileName);
            br = new BufferedReader(new InputStreamReader(is));
            String line = null;
            while ((line = br.readLine()) != null) {
                builder.append(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (is != null) {
                    is.close();
                }
                if (br != null) {
                    br.close();
                }
            } catch (Exception e) {

            }
        }

        return builder.toString();
    }
}