簡單json格式拼接

工具方法類 util

public static String map_2_json(Map<String, Object> map) {
		int last = 0;
		StringBuffer sb = new StringBuffer("{");
		Iterator<String> it = map.keySet().iterator();
		while (it.hasNext()) {
			String key = it.next();
			sb.append("\"").append(key).append("\"").append(":");
			Object value = map.get(key);
			if (value instanceof String) //String 類型
				sb.append("\"").append(value.toString()).append("\"");
			else if (value instanceof Integer) //int 類型
				sb.append(value);
			else if (value instanceof List) { // list 類型
				List<Object> list = (List<Object>) value;
				sb.append(list_2_json(list));

			} else if (value instanceof Map)
				sb.append(map_2_json((Map<String, Object>) value));
			if (last != map.size() - 1)

				sb.append(",");
			last++;
		}

		sb.append("}");
		return sb.toString();
	}
<span style="white-space:pre">	</span>//json 中包含list
	public static String list_2_json(List<Object> list) {
		StringBuffer sb = new StringBuffer("[");
		int tag = 0;
		for (Object object : list) {
			if (object instanceof String)
				sb.append("\"").append(object.toString()).append("\"");
			else if (object instanceof Map) {
				Map<String, Object> map = (Map<String, Object>) object;
				sb.append(map_2_json(map));
			} else if (object instanceof Integer)
				sb.append(object);
			else if (object instanceof List)
				sb.append(list_2_json((List<Object>) object));
			if (tag != list.size() - 1)
				sb.append(",");
			tag++;
		}
		sb.append("]");
		return sb.toString();
	}

	// 登錄
	public static Map<String, Object> login(String cid, String uid,
			String username) {
		Map<String, Object> map = new HashMap<String, Object>();
		Map<String, Object> map1 = new HashMap<String, Object>();
		map1.put("cid", cid);
		map1.put("uid", uid);
		map1.put("username", username);

		map.put("cmd", "login");
		map.put("code", 102);
		map.put("msg", map1);
		return map;
	}