标签：print new pre mode object list system nbsp final
JSON这个类是fastjson API的入口，主要的功能都通过这个类提供。
// 将Java对象序列化为JSON字符串，支持各种各种Java基本类型和JavaBean public static String toJSONString(Object object, SerializerFeature... features); // 将Java对象序列化为JSON字符串，返回JSON字符串的utf-8 bytes public static byte[] toJSONBytes(Object object, SerializerFeature... features); // 将Java对象序列化为JSON字符串，写入到Writer中 public static void writeJSONString(Writer writer, Object object, SerializerFeature... features); // 将Java对象序列化为JSON字符串，按UTF-8编码写入到OutputStream中 public static final int writeJSONString(OutputStream os, Object object, SerializerFeature... features);
// 将JSON字符串反序列化为JavaBean public static <T> T parseObject(String jsonStr, Class<T> clazz, Feature... features); // 将JSON字符串反序列化为JavaBean public static <T> T parseObject(byte[] jsonBytes, // UTF-8格式的JSON字符串 Class<T> clazz, Feature... features); // 将JSON字符串反序列化为泛型类型的JavaBean public static <T> T parseObject(String text, TypeReference<T> type, Feature... features); // 将JSON字符串反序列为JSONObject public static JSONObject parseObject(String text);
String jsonStr = "{ " +
" \"animals\": { " +
" \"dog\": [{ " +
" \"name\": \"Rufus\", " +
" \"breed\": \"labrador\" " +
" }, " +
" { " +
" \"name\": \"Marty\", " +
" \"breed\": \"whippet\" " +
" } " +
" ], " +
" \"cat\": { " +
" \"name\": \"Matilda\" " +
" } " +
" } " +
"}";
//parse Tree JSONObject jsonObj = JSON.parseObject(jsonStr); System.out.println("jsonObj:" + jsonObj);//{"animals":{"cat":{"name":"Matilda"},"dog":[{"name":"Rufus","breed":"labrador"},{"name":"Marty","breed":"whippet"}]}} JSONObject animals = jsonObj.getJSONObject("animals"); System.out.println("animals:" + animals);//{"cat":{"name":"Matilda"},"dog":[{"name":"Rufus","breed":"labrador"},{"name":"Marty",","breed":"whippet"}]} JSONArray dogArr = animals.getJSONArray("dog"); System.out.println("dogArr:" + dogArr);//[{"name":"Rufus","breed":"labrador"},{"name":"Marty","breed":"whippet"}] JSONObject dog0 = dogArr.getJSONObject(0); System.out.println("dog0:" + dog0);//{"name":"Rufus","breed":"labrador"} String dog0name = dog0.getString("name"); System.out.println("dog0name:" + dog0name);//Rufus
//parse POJO JsonRootBean model = JSON.parseObject(jsonStr, JsonRootBean.class); System.out.println("model:" + model);//JsonRootBean{animals=Animals{dog=[Dog{name=‘Rufus‘, breed=‘labrador‘}, Dog{name=‘Marty‘, breed=‘whippet‘}], cat=Cat{name=‘Matilda‘}}}
//parse POJO Generic Type type = new TypeReference<List<Dog>>() { }.getType(); List<Dog> list = JSON.parseObject(dogArr.toString(), type); System.out.println("list:" + list);//[Dog{name=‘Rufus‘, breed=‘labrador‘}, Dog{name=‘Marty‘, breed=‘whippet‘}]
//convert POJO to json string String modelStr = JSON.toJSONString(model); System.out.println("modelStr:" + modelStr);//{"animals":{"cat":{"name":"Matilda"},"dog":[{"breed":"labrador","name":"Rufus"},{"breed":"whippet","name":"Marty"}]}}
//convert POJO to json bytes byte[] modelBytes = JSON.toJSONBytes(model); System.out.println("modelBytes:" + modelBytes.length);//117
参考文章:
https://www.w3cschool.cn/fastjson/fastjson-api.html
标签：print new pre mode object list system nbsp final
原文地址：https://www.cnblogs.com/ooo0/p/10902202.html
