在微信開發中經常需要傳送json資料,這時候可以構建相應的物件以生成需要的json資料,舉例如下:

import com.fasterxml.jackson.databind.ObjectMapper;


/*
 * 將物件轉換為json資料
 * 
 * 以微信sdk生成帶引數的二維碼為例,生成如下json資料
 * {"expire_seconds": 604800, "action_name": "QR_SCENE", 
 * "action_info": {"scene": {"scene_id": 123}}}
 * 
 */

public class jsonTest {
    public
 
 static void main(String[] args) throws Exception {
        //呼叫物件,增加資訊
        Scene scene = new Scene();
        scene.setScene_id("123");

        Action_info action_info = new Action_info();
        action_info.setScene(scene);

        JsonF jsonF = new JsonF();
        jsonF.setExpire_seconds(604800
 
);
        jsonF.setAction_name("QR_SCENE");
        jsonF.setAction_info(action_info);

        ObjectMapper mapper = new ObjectMapper();

        String string = mapper.writeValueAsString(jsonF);

        System.out.println(string);
    }
}

/**
 * 
 * 生成json資料的物件
 */
class JsonF{
    private int expire_seconds ;    //有效期
 

    private String action_name; //二維碼型別
    private Action_info action_info; //場景資訊

    public String getAction_name() {
        return action_name;
    }
    public void setAction_name(String action_name) {
        this.action_name = action_name;
    }
    public Action_info getAction_info() {
        return action_info;
    }
    public void setAction_info(Action_info action_info) {
        this.action_info = action_info;
    }
    public int getExpire_seconds() {
        return expire_seconds;
    }
    public void setExpire_seconds(int expire_seconds) {
        this.expire_seconds = expire_seconds;
    }

}

/**
 * 場景資訊類
 * @author Lee
 *
 */
class Action_info{
    private Scene scene;

    public Scene getScene() {
        return scene;
    }
    public void setScene(Scene scene) {
        this.scene = scene;
    }
}
/**
 * 
 * @author Lee
 *
 */
class Scene{
    private String scene_id;

    public String getScene_id() {
        return scene_id;
    }

    public void setScene_id(String scene_id) {
        this.scene_id = scene_id;
    }

}

輸出結果:

注:本例需要jackson-databind-2.8.2.jar報支援