当需要把map转为实体对象时,需要结合fastjson来实现,方法如下: LinkedHashMap<String,Object> hashMap = new LinkedHashMap<>(); hashMap.put("name", "张三"); hashMap.put("age", 20); hashMap.put("addr", "湖北武汉1号"); User user =json转换成对象
如果使用 org.json 库,请使用 public JSONObject(java.util.Map map): String jsonString = new JSONObject(data).toString() 如果是Gson,使用@hellboy提到的 gson.toJson() 方法: String jsonString = new Gson().toJson(data, Map.class); 原文由 ethanbustad 发布,翻译遵循 CC BY-SA 3.0 许可协议 ...
map转对象抛出异常 LinkedHashMap cannot be case to “XXX“ 将map中的对象直接用 (Object)map.get(“key”) 的方式取value有时会报错的,抛出的异常为 : LinkedHashMap cannot be case to “XXX”; 可采用以下的方法进行处理: 1 . 先将map的value转成json 2 . 再将json字符串装换成相应的对象......
Gson gson=newGsonbuilder.enableComplexMapKeySerialization().create(); String json1=gson.toJson(linkedMap1); System.out.println(json1)//输出jsonStr1={"b":"2","a":"1","c":"3"} 上面两段代码的输出均正确。 虽然LinkedHashMap是有序的,但是使用JDK自带的JSON序列化类或者fastJson进行默认设置的...
@SuppressWarnings("unchecked")Map<Object,Object>map=newGson().fromJson("{}",Map.class);map.put(null,1);varmap2=newGson().fromJson("{}",newTypeToken<Map<String,Integer>>() {});map2.put(null,1); Note: I have added thejava8Issues related to making Java 8 the minimum supported ver...
类java.util.LinkedHashMap不能转换为类java.lang.String (java.util.LinkedHashMap和java.lang.String...
<T> ResponseEntity<T> org.springframework.web.client.RestOperations.exchange(String url, HttpMethod method, HttpEntity<?> requestEntity, ParameterizedTypeReference<T> responseType, Object... uriVariables) throws RestClientException Execute the HTTP method to the given URI template, writing the given req...
* This method is invoked by the superclass whenever the value * of a pre-existing entry is read by Map.get or modified by Map.set. * If the enclosing Map is access-ordered, it moves the entry * to the end of the list; otherwise, it does nothing. ...
the problem is that if the json is {"user":"something"} content will be {user=something} , it is not a json is only toString method from HashMap。我怎样才能得到原来的 JSON?我没有 class 映射response 并且它不是创建 map 类的解决方案,这就是我使用 Object.class. 的原因 ---...