利用json类库自动生成json格式数据小测试

[size=small]

import java.util.ArrayList;
import java.util.List;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import net.sf.json.JsonConfig;

import cn.itcast.bean.Province;

public class TestJson {

	public static void main(String[] args) {

		List<Province> list = new ArrayList<Province>();
		Province p1 = new Province(1,"吉林省");
		Province p2 = new Province(2,"辽宁省");
		Province p3 = new Province(3,"山东省");
		list.add(p1);
		list.add(p2);
		list.add(p3);

		JSONArray jsArray = JSONArray.fromObject(list);
		System.out.println(jsArray.toString());
System.out.println("-------------------");

		JsonConfig config = new JsonConfig();
		//过滤 list 集合中存放的 Province 对象的 pid 的属性不生成json
		config.setExcludes(new String[]{"pid"});
		jsArray = JSONArray.fromObject(list, config);
		System.out.println(jsArray);
System.out.println("-------------------");	

		Province p = new Province(1, "吉林省");
		jsArray = JSONArray.fromObject(p);
		//一个对象转化成json格式
		JSONObject jsObject = JSONObject.fromObject(p);
		System.out.println(jsArray);
		System.out.println(jsObject);
System.out.println("-------------------");	

		JsonConfig config1 = new JsonConfig();
		config1.setExcludes(new String[]{"pid"});
		jsObject = JSONObject.fromObject(p, config1);
		System.out.println(jsObject);
	}

}

打印结果：
[{"pid":1,"pname":"吉林省"},{"pid":2,"pname":"辽宁省"},{"pid":3,"pname":"山东省"}]
-------------------
[{"pname":"吉林省"},{"pname":"辽宁省"},{"pname":"山东省"}]
-------------------
[{"pid":1,"pname":"吉林省"}]
{"pid":1,"pname":"吉林省"}
-------------------
{"pname":"吉林省"}[/size]