android中的json二之json的读写

android中的json的读取

1.读取Json文件中的json内容

首先在将json文件放在目录assets下：

test.json

{"programmers":[{"firstName":"Brett","lastName":"McLaughlin","email":"aaaa"},{"firstName":"Jason","lastName":"Hunter","email":"bbbb"},{"firstName":"Elliotte","lastName":"Harold","email":"cccc"}],"authors":[{"firstName":"Isaac","lastName":"Asimov","genre":"sciencefiction"},{"firstName":"Tad","lastName":"Williams","genre":"fantasy"},{"firstName":"Frank","lastName":"Peretti","genre":"christianfiction"}],"musicians":[{"firstName":"Eric","lastName":"Clapton","instrument":"guitar"},{"firstName":"Sergei","lastName":"Rachmaninoff","instrument":"piano"}],"cat":"test"}

在main.java中读取

 try {            InputStreamReader isr=new InputStreamReader(getAssets().open("test.json"),"UTF-8");//打开test.json            BufferedReader br=new BufferedReader(isr);//读取isr            String line;            StringBuilder builder=new StringBuilder();            while ((line =br.readLine())!=null){                builder.append(line);            }            br.close();            isr.close();            JSONObject root=new JSONObject(builder.toString());            System.out.println(root.getString("cat"));            JSONArray arry=root.getJSONArray("programmers");            for (int i=0;i<arry.length();i++){                JSONObject lan=arry.getJSONObject(i);                System.out.println("----------------");                System.out.println("firstName:"+lan.getString("firstName"));                System.out.println("lastName:"+lan.getString("lastName"));                System.out.println("email"+lan.getString("email"));            }        } catch (IOException e) {            e.printStackTrace();            Log.e("IO:" , e.toString());        } catch (JSONException e) {            e.printStackTrace();            Log.e("JSON:", e.toString());        }

显示结果：

如要读取给定Json数据：

可直接将值附上

//JSONObject root=new JSONObject(builder.toString());换成-》            JSONObject root=new JSONObject("{'programmers':[{'firstName':'Brett','lastName':'McLaughlin','email':'aaaa'}]}");
2.创建JSON格式数据
 JSONObject root1=new JSONObject();                try {            root1.put("cat","it");            JSONObject lan1=new JSONObject();            lan1.put("id",1);            lan1.put("ide","android");            lan1.put("name","java");            JSONObject lan2=new JSONObject();            lan1.put("id",2);            lan1.put("ide","xcod");            lan1.put("name","ios");            JSONObject lan3=new JSONObject();            lan1.put("id",3);            lan1.put("ide","vs");            lan1.put("name","C#");            JSONArray array=new JSONArray();            array.put(lan1);            array.put(lan2);            array.put(lan3);            root1.put("programmers",array);            System.out.println(root1.toString());        } catch (JSONException e) {            e.printStackTrace();        }    }


显示结果：

源码下载： http://download.csdn.net/detail/agonie201218/8657765

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