学步园

{

"id": 912345678901,

"age": 33, 

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

"geo": null,
 }

红色部分如果表示有可能为null，则在判断的时候需要如下name.equals("geo")&& reader.peek() != JsonToken.NULL

橙色部分要是想不解析其中的Json字段，需要在判断的时候加上一个else语句如下：else{reader.skipValue()} 

 

然后是一些例子，都是Json的各种组合形式，不定时更新 

1. 现实Json数据，后面每一个都是如此不再做任何的解析了，然后跟着就是对应的代码内容

 {

     "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();

  }