java解析json格式的字符串

1.解析简单的josn格式字符串
String msg = "{'rs':0,'fs':'登录成功!'}";
JSONObject jsonObject = new JSONObject(msg);
System.out.println(jsonObject.getString("fs"))

2.解析json数组格式的字符串
String jsonStr = "[{\"assignNo\":\"201310091540\", \"deliveryStatus\":\"66666\",\"id\":\"1\", \"remark\":\"YY\",\"userName\":\"ZHANGSAN\"}, {\"assignNo\":\"3215242251522215\", \"deliveryStatus\":\"33333\",\"id\":\"3\", \"imgName\":\"1381314903597.png\",\"imgStr\": \"1381314903597.png\",\"remark\":\"\", \"userName\":\"ZHANGSAN\"}]";
JSONArray jsonArray = JSONArray.fromObject(jsonStr);
Object[] objs = jsonArray.toArray();
for (Object object : objs) {
JSONObject jsonObject = JSONObject.fromObject(object);
if(jsonObject.has("imgStr")){
System.out.println(jsonObject.getString("imgStr"));
}
System.out.println(jsonObject.getString("assignNo"));
}