Android之Gson

{

"id": 912345678901,

"age": 33, 

"text": "How do I stream JSON in Java?",

"geo": null,
 }

紅色部分如果表示有可能為null，則在判斷的時候需要如下name.equals("geo")&& reader.peek() != JsonToken.NULL

橙色部分要是想不解析其中的Json欄位，需要在判斷的時候加上一個else語句如下：else{reader.skipValue()} 

 

然後是一些例子，都是Json的各種組合形式，不定時更新 

1. 現實Json資料，後面每一個都是如此不再做任何的解析了，然後跟著就是對應的代碼內容

 {

     "id": 912345678901,     "text": "How do I stream JSON in Java?",     "geo": null,     "user": {       "name": "json_newb",       "followers_count": 41      }}    reader.beginObject();
            while (reader.hasNext()) {
                String name = reader.nextName();
                if (name.equals("id")) {
                    System.out.println("id:" + reader.nextLong());
                } else if (name.equals("text")) {
                    System.out.println("text:" + reader.nextString());
                } else if (name.equals("geo") && reader.peek() != JsonToken.NULL) {
                    System.out.println("text:" + reader.nextString());
                } else if (name.equals("user")) {
                    usernameObject();
                } else {
                    reader.skipValue();
                }
            }
            reader.endObject();

private void usernameObject() throws IOException{
        reader.beginObject();
        while (reader.hasNext()) {
            String nxtName = reader.nextName();
            if (nxtName.equals("name")) {
                System.out.println("nxtName:" + reader.nextString());
            } else if (nxtName.equals("followers_count")) {
                System.out.println("nxtName:" + reader.nextInt());
            }

}  

        

2.

[{     "id": 912345678901,     "text": "How do I stream JSON in Java?",     "geo": null,     "user": {       "name": "json_newb",       "followers_count": 41      }},{     "id": 777777777888,     "text": "dfngsdnglnsldfnsl",     "geo": null,     "user": {       "name": "dsfgpd",       "followers_count": 24      }}

] 

reader.beginArray();
        while(reader.hasNext()){
            reader.beginObject();
            while (reader.hasNext()) {
                String name = reader.nextName();
                if (name.equals("id")) {
                    System.out.println("id:" + reader.nextLong());
                } else if (name.equals("text")) {
                    System.out.println("text:" + reader.nextString());
                } else if (name.equals("geo") && reader.peek() != JsonToken.NULL) {
                    System.out.println("text:" + reader.nextString());
                } else if (name.equals("user")) {
                    usernameObject();
                } else {
                    reader.skipValue();
                }
            }
            reader.endObject();
        }

reader.endArray();  

        

3. 

{"statuses":[{     "id": 912345678901,     "text": "How do I stream JSON in Java?",     "geo": null,     "user": {        "name": "json_newb",        "followers_count": 41      }      },      {     "id": 777777777888,     "text": "dfngsdnglnsldfnsl",     "geo": null,     "user": {        "name": "dsfgpd",        "followers_count": 24      }      }     ]

} 

reader.beginObject();
        while(reader.hasNext())
        { 
            String begin = reader.nextName();
            if(begin.equals("statuses"))
            {
                array();
            }
        }
        reader.endObject();

private void array() throws IOException{
        reader.beginArray();
        while(reader.hasNext()){
            reader.beginObject();
            while (reader.hasNext()) {
                String name = reader.nextName();
                if (name.equals("id")) {
                    System.out.println("id:" + reader.nextLong());
                } else if (name.equals("text")) {
                    System.out.println("text:" + reader.nextString());
                } else if (name.equals("geo") && reader.peek() != JsonToken.NULL) {
                    System.out.println("text:" + reader.nextString());
                } else if (name.equals("user")) {
                    usernameObject();
                } else {
                    reader.skipValue();
                }
            }
            reader.endObject();
        }
        reader.endArray();
    }

private void usernameObject() throws IOException{
        reader.beginObject();
        while (reader.hasNext()) {
            String nxtName = reader.nextName();
            if (nxtName.equals("name")) {
                System.out.println("nxtName:" + reader.nextString());
            } else if (nxtName.equals("followers_count")) {
                System.out.println("nxtName:" + reader.nextInt());
            }
        }
        reader.endObject();

  }