* 测试Object to String */ @Benchmark public String objectMapper2StringTest() throws JsonProcessingException { ObjectMapper objectMapper = new ObjectMapper(); return objectMapper.writeValueAsString(userEntity); } public static void main(String[] args) throws RunnerException { Options opt = new Options...
log.warn("Parse object to String error", e);returnnull; } }//将json形式的字符串数据转换成单个对象publicstatic<T> T string2Obj(String str, Class<T>clazz){if(StringUtils.isEmpty(str) || clazz ==null){returnnull; }try{returnclazz.equals(String.class) ?(T) str : objectMapper.readValue(...
Map<String, Object> testMap = new HashMap<>(); testMap.put("name", "22"); testMap.put("age", 20); testMap.put("date", new Date()); testMap.put("student", new Student("hyl", 20, new Date())); String jsonStr = mapper.writeValueAsString(testMap); System.out.println(json...
通过下面的类图,展示了ObjectMapper与其他JSON处理库的模块差异。 ObjectMapper+readValue(String content, Class valueType)+writeValueAsString(Object value)Gson+fromJson(String json, Class classOfT)+toJson(Object src) 特性拆解 ObjectMapper提供了多种功能特性,支持类型转换、数据绑定和序列化等。下面是功能树对比...
writeValue(File resultFile, Object value):写到目标文件里 writeValue(OutputStream out, Object value):写到输出流 String writeValueAsString(Object value):写成字符串形式,此方法最为常用 writeValueAsBytes(Object value):写成字节数组byte[] 代码语言:txt ...
(String) obj:objectMapper.writeValueAsString(obj); } catch (IOException e) { log.warn("Parse object to String error", e); return null; } } //将单个对象转换成json格式的字符串(格式化后的json) public static <T> String obj2StringPretty(T obj){ if (obj == null){ return null; } try...
java objectMapper string 转为 jsonObject objectmapper json转对象,出现的场景:服务端通过springmvc写了一个对外的接口,返回一个json字符串,其中该json带有日期,格式为yyyy-MM-ddHH:mm:ss客户端通过feign调用该http接口,指定返回值为一个Dto,Dto中日期的字段为Date
String writeValueAsString(Object value):写成字符串形式,此方法最为常用 writeValueAsBytes(Object value):写成字节数组byte[] @Testpublicvoidtest3()throwsJsonProcessingException{ObjectMapper objectMapper=newObjectMapper();System.out.println("---写简单类型---");System.out.println(objectMapper.writeValueAs...
String jsonString = "{\"name\":\"BMW\",\"color\":\"Black\"}"; Car car = objectMapper.readValue(jsonString, Car.class); assertNotNull(car); System.out.println(car);} readValue()函数还接受其他形式的输入,比如从JSON字符串的文件中读取数据: @Testpublic...
return objectMapper.writeValueAsString(object);} catch (JsonProcessingException e) { // TODO: handle exception } return null;} public static <T> T stringToObject(String json,Class<T> object) throws IOException { return objectMapper.readValue(json,object);} public static <T> List<T> string...