java中创建json对象 java创建json文件

在JAVA中构造和解析JSON我用的是org.json，附件为相应的org.json.jar.

下面是两个函数，一个是创建JSON，一个是从文本构造JSON并解析之。

创建json

//construct json and output it	
public String jsonTest() throws JSONException{
	JSONObject json=new JSONObject();
	JSONArray jsonMembers = new JSONArray();
	JSONObject member1 = new JSONObject();
	member1.put("loginname", "zhangfan");
	member1.put("password", "userpass");
	member1.put("email","10371443@");
	member1.put("sign_date", "2007-06-12");
	jsonMembers.put(member1);

	JSONObject member2 = new JSONObject();
	member2.put("loginname", "zf");
	member2.put("password", "userpass");
	member2.put("email","8223939@");
	member2.put("sign_date", "2008-07-16");
	jsonMembers.put(member2);
	json.put("users", jsonMembers);

	return json.toString();
}

 解析json 

//construct json from String and resolve it.
public String jsonTest2() throws JSONException{
	String jsonString="{\"users\":[{\"loginname\":\"zhangfan\",\"password\":\"userpass\",\"email\":\"10371443@\"},{\"loginname\":\"zf\",\"password\":\"userpass\",\"email\":\"822393@\"}]}";
	JSONObject json= new JSONObject(jsonString);
	JSONArray jsonArray=json.getJSONArray("users");
	String loginNames="loginname list:";
	for(int i=0;i<jsonArray.length();i++){
		JSONObject user=(JSONObject) jsonArray.get(i);
		String userName=(String) user.get("loginname");
		if(i==jsonArray.length()-1){
			loginNames+=userName;
		}else{
			loginNames+=userName+",";
		}
	}
	return loginNames;
}

 JAVA中处理JSON还是相当方便的。