<groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.6</version> </dependency> 2、引用 importcom.alibaba.fastjson.JSONObject; 3、对象转JSON字符串 4、JSON转对象
//将json文件中的数据映射到DataParam实体类中importcom.alibaba.fastjson.JSON;publicstaticList<DataParam>getListDataFromJson(String jsonPath){List<DataParam>ddps=newArrayList<DataParam>();ddps=JSON.parseArray(readToString(jsonPath),DataParam.class);returnddps;}//将DataParam的list数据处理成mappublicstati...
public <T> T fromJson(String jsonString, Class<?> parametrized, Class<?>... parameterClasses) { return (T) this.fromJson(jsonString, constructParametricType(parametrized, parameterClasses)); } @SuppressWarnings("unchecked") public <T> List<T> fromJsonToList(String jsonString, Class<T> cla...
然后,我们可以使用Gson库将JSON数据转换为Java实体类User的示例: importcom.google.gson.Gson;publicclassJsonToJavaExample{publicstaticvoidmain(String[]args){Stringjson="{ \"username\": \"john_doe\", \"email\": \"john.doe@example.com\" }";Gsongson=newGson();Useruser=gson.fromJson(json,User....
public class JsonUtils { private static final Logger LOG = Logger.getLogger(JsonUtils.class); // 定义jackson对象,用于 Java 对象的序列化及反序列化 private static final ObjectMapper MAPPER = new ObjectMapper(); static { //设置实体无属性和json串属性对应时不会出错,只转换对应的属性 ...
例如,如果有一个自定义的日期格式在 JSON 中,而 Java 对象中的日期字段类型是java.util.Date,可以创建一个自定义的JsonDeserializer来处理这种转换。 以下是一个自定义JsonDeserializer的简单示例,用于将特定格式的字符串转换为Date对象: publicclassCustomDateDeserializerextendsJsonDeserializer<Date>{privateSimpleDate...
// JSONObject obj = (JSONObject) JSON.toJSON(bob);// assertEquals(3, obj.size());// assertEquals(Boolean.TRUE, obj.get("sex"));// assertEquals("Bob", obj.get("name"));// assertEquals(new Integer(30), obj.get("age"));PersonInfo info = Bob.class.getAnnotation(PersonInfo.class)...
compile 'com.alibaba:fastjson:1.2.31' compile 'com.alibaba:fastjson:1.1.57.android' 有如下json字符串和类: String t2 = "{\"state\":2,\"msg\":\"msg2222\",\"data\":{}}"; public static class Test { public int state; public String msg; public List<Da...
使用JSONObject.toJavaObject(JSON.parseObject("{"typeCharKey":"0"}", Type.class),对象内有Character属性转换异常。 public class Type{ private Character typeCharKey; } 若json里typeCharKey的值是0之类的数字,就会抛出异常com.alibaba.fastjson.JSONException: can not cast to char, value : 0。因为会把...
Specify all values for json fields with non-null values. By doing so, the generator will try to re-use classes it already generated in other structures as long as the class can be parsed back from json into the generated class. Limitations ...