cn.net.wanmo.common.util

类 JacksonMapper

java.lang.Object

com.fasterxml.jackson.core.TreeCodec

com.fasterxml.jackson.core.ObjectCodec

com.fasterxml.jackson.databind.ObjectMapper

cn.net.wanmo.common.util.JacksonMapper

所有已实现的接口:

com.fasterxml.jackson.core.Versioned, Serializable

public class JacksonMapper
extends com.fasterxml.jackson.databind.ObjectMapper

Jackson可以轻松的将Java对象转换成json对象和xml文档，同样也可以将json、xml转换成Java对象.. 如果需要转换xml，那么还需要stax2-api.jarb

Jackson提供了一系列注解，方便对JSON序列化和反序列化进行控制，下面介绍一些常用的注解。 // @ JsonIgnore 此注解用于属性上，作用是进行JSON操作时忽略该属性。 // @ JsonFormat 此注解用于属性上，作用是把Date类型直接转化为想要的格式，如@JsonFormat(pattern = "yyyy-MM-dd HH-mm-ss")。 // @ JsonProperty 此注解用于属性上，作用是把该属性的名称序列化为另外一个名称，如把trueName属性序列化为name，@JsonProperty("name")。 // http://blog.csdn.net/jesse621/article/details/22698565

另请参阅:

序列化表格

嵌套类概要

从类继承的嵌套类/接口 com.fasterxml.jackson.databind.ObjectMapper

com.fasterxml.jackson.databind.ObjectMapper.DefaultTypeResolverBuilder, com.fasterxml.jackson.databind.ObjectMapper.DefaultTyping

字段概要

字段

限定符和类型	字段和说明
private static org.slf4j.Logger	logger
private static JacksonMapper	mapper

从类继承的字段 com.fasterxml.jackson.databind.ObjectMapper

_configOverrides, _deserializationConfig, _deserializationContext, _injectableValues, _jsonFactory, _mixIns, _registeredModuleTypes, _rootDeserializers, _serializationConfig, _serializerFactory, _serializerProvider, _subtypeResolver, _typeFactory, DEFAULT_ANNOTATION_INTROSPECTOR, DEFAULT_BASE

构造器概要

构造器

构造器和说明
JacksonMapper()
JacksonMapper(com.fasterxml.jackson.annotation.JsonInclude.Include include)

方法概要

限定符和类型	方法和说明
static com.fasterxml.jackson.databind.node.ObjectNode	createObjectNode(Map<String,String> map) 创建 节点 对象
JacksonMapper	enableSimple() 允许单引号 允许不带引号的字段名称
static <T> T	fromJson(byte[] json, Class<T> clazz) 读取JSON数据: 从 byte[]
static <T> T	fromJson(File json, Class<T> valueType) 读取JSON数据: 从文件
static <T> T	fromJson(InputStream json, Class<T> valueType) 读取JSON数据: 从 InputStream
static <T> T	fromJson(String json, Class<T> valueType) 读取JSON数据: 从字符串
static <T> T	fromJson(String json, com.fasterxml.jackson.databind.JavaType javaType) 该方法有时有问题
static com.fasterxml.jackson.databind.JavaType	getCollectionType(Class<?> collectionClass, Class<?>... elementClasses) 获取泛型的Collection Type
static JacksonMapper	getMapper() 返回mapper，忽略未知参数、使用long解析时间
static <T> T	jsonToList(String json, Class<T> valueType) 将 json 转为 List, 该方法有时有问题
static void	main(String[] args)
static JacksonMapper	nonDefaultMapper() 创建只输出初始值被改变的属性到Json字符串的Mapper, 最节约的存储方式，建议在内部接口中使用。
static String	toJson(Object obj) java对象转换成JSON字符串 java对象、List、Map
static com.fasterxml.jackson.databind.JsonNode	toNode(String content) JSON 字符串解析为 JsonNode
static <T> void	writeJson(File file, T value) 写入JSON数据：到 文件

从类继承的方法 com.fasterxml.jackson.databind.ObjectMapper

_checkInvalidCopy, _configAndWriteValue, _convert, _findRootDeserializer, _initForReading, _initForReading, _newReader, _newReader, _newWriter, _newWriter, _newWriter, _readMapAndClose, _readTreeAndClose, _readValue, _serializerProvider, _unwrapAndDeserialize, _verifyNoTrailingTokens, _verifySchemaType, acceptJsonFormatVisitor, acceptJsonFormatVisitor, addHandler, addMixIn, addMixInAnnotations, canDeserialize, canDeserialize, canSerialize, canSerialize, clearProblemHandlers, configOverride, configure, configure, configure, configure, configure, constructType, convertValue, convertValue, convertValue, copy, createArrayNode, createDeserializationContext, createObjectNode, defaultClassIntrospector, disable, disable, disable, disable, disable, disable, disable, disableDefaultTyping, enable, enable, enable, enable, enable, enable, enable, enableDefaultTyping, enableDefaultTyping, enableDefaultTyping, enableDefaultTypingAsProperty, findAndRegisterModules, findMixInClassFor, findModules, findModules, generateJsonSchema, getDateFormat, getDeserializationConfig, getDeserializationContext, getFactory, getInjectableValues, getJsonFactory, getNodeFactory, getPropertyNamingStrategy, getRegisteredModuleIds, getSerializationConfig, getSerializerFactory, getSerializerProvider, getSerializerProviderInstance, getSubtypeResolver, getTypeFactory, getVisibilityChecker, isEnabled, isEnabled, isEnabled, isEnabled, isEnabled, isEnabled, mixInCount, reader, reader, reader, reader, reader, reader, reader, reader, reader, reader, reader, readerFor, readerFor, readerFor, readerForUpdating, readerWithView, readTree, readTree, readTree, readTree, readTree, readTree, readTree, readValue, readValue, readValue, readValue, readValue, readValue, readValue, readValue, readValue, readValue, readValue, readValue, readValue, readValue, readValue, readValue, readValue, readValue, readValue, readValue, readValue, readValue, readValue, readValue, readValue, readValue, readValue, readValues, readValues, readValues, readValues, registerModule, registerModules, registerModules, registerSubtypes, registerSubtypes, registerSubtypes, setAnnotationIntrospector, setAnnotationIntrospectors, setBase64Variant, setConfig, setConfig, setDateFormat, setDefaultMergeable, setDefaultPrettyPrinter, setDefaultPropertyInclusion, setDefaultPropertyInclusion, setDefaultSetterInfo, setDefaultTyping, setDefaultVisibility, setFilterProvider, setFilters, setHandlerInstantiator, setInjectableValues, setLocale, setMixInAnnotations, setMixInResolver, setMixIns, setNodeFactory, setPropertyInclusion, setPropertyNamingStrategy, setSerializationInclusion, setSerializerFactory, setSerializerProvider, setSubtypeResolver, setTimeZone, setTypeFactory, setVisibility, setVisibility, setVisibilityChecker, treeAsTokens, treeToValue, updateValue, valueToTree, version, writer, writer, writer, writer, writer, writer, writer, writer, writer, writer, writerFor, writerFor, writerFor, writerWithDefaultPrettyPrinter, writerWithType, writerWithType, writerWithType, writerWithView, writeTree, writeTree, writeValue, writeValue, writeValue, writeValue, writeValue, writeValueAsBytes, writeValueAsString

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

logger

private static org.slf4j.Logger logger

mapper

private static JacksonMapper mapper

构造器详细资料

JacksonMapper

public JacksonMapper()

JacksonMapper

public JacksonMapper(com.fasterxml.jackson.annotation.JsonInclude.Include include)

方法详细资料

enableSimple

public JacksonMapper enableSimple()

允许单引号 允许不带引号的字段名称

getMapper

public static JacksonMapper getMapper()

返回mapper，忽略未知参数、使用long解析时间

返回:

ObjectMapper

nonDefaultMapper

public static JacksonMapper nonDefaultMapper()

创建只输出初始值被改变的属性到Json字符串的Mapper, 最节约的存储方式，建议在内部接口中使用。

toJson

public static String toJson(Object obj)

java对象转换成JSON字符串
java对象、List、Map

fromJson

public static <T> T fromJson(byte[] json,
                             Class<T> clazz)

读取JSON数据: 从 byte[]

参数:

json -

clazz -

返回:

对象

fromJson

public static <T> T fromJson(InputStream json,
                             Class<T> valueType)

读取JSON数据: 从 InputStream

参数:

json -

valueType -

返回:

泛型对象

fromJson

public static <T> T fromJson(String json,
                             Class<T> valueType)

读取JSON数据: 从字符串

参数:

json -

valueType -

返回:

泛型对象

fromJson

public static <T> T fromJson(File json,
                             Class<T> valueType)

读取JSON数据: 从文件

参数:

json -

valueType -

返回:

泛型对象

fromJson

public static <T> T fromJson(String json,
                             com.fasterxml.jackson.databind.JavaType javaType)
                      throws Exception

该方法有时有问题

参数:

json -

javaType -

返回:

泛型对象

抛出:

Exception

jsonToList

public static <T> T jsonToList(String json,
                               Class<T> valueType)
                        throws Exception

将 json 转为 List, 该方法有时有问题

参数:

json -

valueType - 对象类型

返回:

泛型对象

抛出:

Exception

getCollectionType

public static com.fasterxml.jackson.databind.JavaType getCollectionType(Class<?> collectionClass,
                                                                        Class<?>... elementClasses)

获取泛型的Collection Type

参数:

collectionClass - 泛型的Collection

elementClasses - 元素类

返回:

JavaType Java类型

从以下版本开始:

1.0

writeJson

public static <T> void writeJson(File file,
                                 T value)

写入JSON数据：到 文件

参数:

file -

value -

toNode

public static com.fasterxml.jackson.databind.JsonNode toNode(String content)
                                                      throws IOException

JSON 字符串解析为 JsonNode

参数:

content -

返回:

JSON 字符串解析为 JsonNode

抛出:

IOException

createObjectNode

public static com.fasterxml.jackson.databind.node.ObjectNode createObjectNode(Map<String,String> map)

创建 节点 对象

参数:

map -

返回:

节点 对象

main

public static void main(String[] args)