程序包 com.ajaxjs.util

类 JsonUtil

java.lang.Object
com.ajaxjs.util.JsonUtil
public class JsonUtil extends Object
Encapsulation of Jackson Library: Conversion Methods Between JSON, Map, Bean, and List.

  • 字段概要

    字段
    修饰符和类型
    字段
    说明
    static final com.fasterxml.jackson.databind.ObjectMapper
    OBJECT_MAPPER
     

  • 构造器概要

    构造器
    构造器
    说明
    JsonUtil()
     

  • 方法概要

    修饰符和类型
    方法
    说明
    static <T> T
    convertValue(Object obj, Class<T> clazz)
    Converts an object to another object This method uses ObjectMapper from the Jackson library to convert an object of any type to another type specified by clazz It is primarily used for data type conversion when the specific type is known at runtime
    static <T> T
    fromJson(String jsonStr, com.fasterxml.jackson.databind.JavaType valueType)
    Converts a JSON string to a Java object.
    static <T> T
    fromJson(String jsonStr, Class<T> valueType)
    Converts a JSON string to an object of the specified type.
    static <T> List<T>
    json2list(String jsonArrayStr, Class<T> clazz)
    JSON array string converts to list with Java Bean
    static Map<String,Object>
    json2map(String jsonStr)
    json string converts to map This method is used to convert a JSON string into a Map object with String as the key type and Object as the value type.
    static <T> Map<String,T>
    json2map(String jsonStr, Class<T> clazz)
    JSON string convert to map with javaBean
    static List<Map<String,Object>>
    json2mapList(String jsonArrayStr)
     
    static com.fasterxml.jackson.databind.JsonNode
    json2Node(String jsonStr)
    JSON string converts to node
    static <T> LinkedHashMap<String,T>
    json2sortMap(String jsonStr, Class<T> clazz)
    JSON string converts to map with javaBean This method converts a JSON string into a LinkedHashMap of String keys and JavaBean values.
    static Map<String,String>
    json2StrMap(String jsonStr)
    Converts a JSON string to a Map object.
    static <T> T
    map2pojo(Map<String,Object> map, Class<T> clazz)
     
    static Map<String,Object>
    pojo2map(Object obj)
    Java Bean converts to map This method is used to convert a Java Bean object into a Map object, facilitating operations such as lookup, addition, and deletion It does not require detailed explanation for simple delegation to another overload method
    static <T> Map<String,T>
    pojo2map(Object obj, Class<T> clazz)
    Java Bean converts to map
    static String
    toJson(Object obj)
    Converts a Java object to a JSON string.
    static String
    toJsonPretty(Object obj)
    Java Bean, list, array converts to pretty json string

    从类继承的方法 java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • 字段详细资料

    • OBJECT_MAPPER

      public static final com.fasterxml.jackson.databind.ObjectMapper OBJECT_MAPPER

  • 构造器详细资料

    • JsonUtil

      public JsonUtil()

  • 方法详细资料

    • toJson

      public static String toJson(Object obj)
      Converts a Java object to a JSON string.
      参数:
      obj - The Java object to be converted to a JSON string.
      返回:
      The JSON string representation of the Java object.

    • toJsonPretty

      public static String toJsonPretty(Object obj)
      Java Bean, list, array converts to pretty json string
      参数:
      obj - Java Bean, list, array
      返回:
      The JSON string representation of the Java object.

    • fromJson

      public static <T> T fromJson(String jsonStr, Class<T> valueType)
      Converts a JSON string to an object of the specified type.
      类型参数:
      T - The generic type parameter indicating the type of the returned object.
      参数:
      jsonStr - The JSON string representing the data to be converted.
      valueType - The class type of the target object.
      返回:
      The converted object of type T.
      抛出:
      RuntimeException - If the JSON string cannot be converted to the target type.

    • fromJson

      public static <T> T fromJson(String jsonStr, com.fasterxml.jackson.databind.JavaType valueType)
      Converts a JSON string to a Java object.
      类型参数:
      T - the generic type parameter for the return value
      参数:
      jsonStr - the JSON string representing the data to be converted
      valueType - the target Java type of the object
      返回:
      the converted Java object

      This method uses ObjectMapper to read the JSON string and convert it to the specified Java object type. If any error occurs during the conversion, a runtime exception is thrown.

    • json2map

      public static <T> Map<String,T> json2map(String jsonStr, Class<T> clazz)
      JSON string convert to map with javaBean
      类型参数:
      T - The type of the value in the Map
      参数:
      jsonStr - The JSON string to be converted
      clazz - The class of the JavaBean type in the Map value
      返回:
      Returns a Map containing keys of type String and values of the specified JavaBean type

    • json2sortMap

      public static <T> LinkedHashMap<String,T> json2sortMap(String jsonStr, Class<T> clazz)
      JSON string converts to map with javaBean This method converts a JSON string into a LinkedHashMap of String keys and JavaBean values. It uses the Jackson library's ObjectMapper to parse the JSON string according to the specified JavaBean type, and stores it in a LinkedHashMap, preserving the order of insertion.
      类型参数:
      T - Generic parameter, represents the type of JavaBean
      参数:
      jsonStr - The JSON string to be converted
      clazz - The class type of the JavaBean
      返回:
      Returns a LinkedHashMap containing String keys and JavaBean values of the specified type

    • json2map

      public static Map<String,Object> json2map(String jsonStr)
      json string converts to map This method is used to convert a JSON string into a Map object with String as the key type and Object as the value type. It simplifies the process of accessing and manipulating JSON data by converting it into a Map format.
      参数:
      jsonStr - The JSON string to be converted.
      返回:
      Returns a Map object containing the key-value pairs converted from the JSON string.

    • json2StrMap

      public static Map<String,String> json2StrMap(String jsonStr)
      Converts a JSON string to a Map object. This method specifically converts a string in JSON format into a Map object where the key and value are both of type String. It is used to facilitate the parsing and use of JSON data in programs.
      参数:
      jsonStr - The JSON string to be converted, which should be in a format that can be correctly parsed into a Map.
      返回:
      Returns a Map object with String keys and values, representing the converted JSON data.

    • json2list

      public static <T> List<T> json2list(String jsonArrayStr, Class<T> clazz)
      JSON array string converts to list with Java Bean
      类型参数:
      T - Generic type parameter, indicating the type of elements in the list
      参数:
      jsonArrayStr - The JSON array string, representing a list of objects
      clazz - The class type of the list elements, used to specify the type of Java Bean
      返回:
      Returns a list of Java Bean objects converted from the JSON array string

    • json2mapList

      public static List<Map<String,Object>> json2mapList(String jsonArrayStr)

    • convertValue

      public static <T> T convertValue(Object obj, Class<T> clazz)
      Converts an object to another object This method uses ObjectMapper from the Jackson library to convert an object of any type to another type specified by clazz It is primarily used for data type conversion when the specific type is known at runtime
      类型参数:
      T - Generic parameter, represents the target type to convert to
      参数:
      obj - The object to be converted, can be of any type
      clazz - The target type class to convert to
      返回:
      Returns an object of the converted target type

    • pojo2map

      public static Map<String,Object> pojo2map(Object obj)
      Java Bean converts to map This method is used to convert a Java Bean object into a Map object, facilitating operations such as lookup, addition, and deletion It does not require detailed explanation for simple delegation to another overload method
      参数:
      obj - The Java Bean object to be converted
      返回:
      Returns a Map object containing all the properties of the Java Bean

    • pojo2map

      public static <T> Map<String,T> pojo2map(Object obj, Class<T> clazz)
      Java Bean converts to map
      类型参数:
      T - The generic type of the map value
      参数:
      obj - The Java Bean object to be converted
      clazz - The class type of the map value
      返回:
      Returns a map converted from the Java Bean, with String as the key and the specified generic type as the value

    • map2pojo

      public static <T> T map2pojo(Map<String,Object> map, Class<T> clazz)

    • json2Node

      public static com.fasterxml.jackson.databind.JsonNode json2Node(String jsonStr)
      JSON string converts to node
      参数:
      jsonStr - The JSON string to be converted
      返回:
      JsonNode object converted from the JSON string