# Gson
Gson is a Java library that can be used to convert Java Objects into their JSON representation. It can also be used to convert a JSON string to an equivalent Java object.
Gson can work with arbitrary Java objects including pre-existing objects that you do not have source-code of.
There are a few open-source projects that can convert Java objects to JSON. However, most of them require that you place Java annotations in your classes; something that you can not do if you do not have access to the source-code. Most also do not fully support the use of Java Generics. Gson considers both of these as very important design goals.
:information_source: Gson is currently in maintenance mode; existing bugs will be fixed, but large new features will likely not be added. If you want to add a new feature, please first search for existing GitHub issues, or create a new one to discuss the feature and get feedback.
### Goals
* Provide simple `toJson()` and `fromJson()` methods to convert Java objects to JSON and vice-versa
* Allow pre-existing unmodifiable objects to be converted to and from JSON
* Extensive support of Java Generics
* Allow custom representations for objects
* Support arbitrarily complex objects (with deep inheritance hierarchies and extensive use of generic types)
### Download
Gradle:
```gradle
dependencies {
implementation 'com.google.code.gson:gson:2.10.1'
}
```
Maven:
```xml
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.10.1</version>
</dependency>
```
[Gson jar downloads](https://maven-badges.herokuapp.com/maven-central/com.google.code.gson/gson) are available from Maven Central.
![Build Status](https://github.com/google/gson/actions/workflows/build.yml/badge.svg)
### Requirements
#### Minimum Java version
- Gson 2.9.0 and newer: Java 7
- Gson 2.8.9 and older: Java 6
Despite supporting older Java versions, Gson also provides a JPMS module descriptor (module name `com.google.gson`) for users of Java 9 or newer.
#### JPMS dependencies (Java 9+)
These are the optional Java Platform Module System (JPMS) JDK modules which Gson depends on.
This only applies when running Java 9 or newer.
- `java.sql` (optional since Gson 2.8.9)
When this module is present, Gson provides default adapters for some SQL date and time classes.
- `jdk.unsupported`, respectively class `sun.misc.Unsafe` (optional)
When this module is present, Gson can use the `Unsafe` class to create instances of classes without no-args constructor.
However, care should be taken when relying on this. `Unsafe` is not available in all environments and its usage has some pitfalls,
see [`GsonBuilder.disableJdkUnsafe()`](https://javadoc.io/doc/com.google.code.gson/gson/latest/com.google.gson/com/google/gson/GsonBuilder.html#disableJdkUnsafe()).
### Documentation
* [API Javadoc](https://www.javadoc.io/doc/com.google.code.gson/gson): Documentation for the current release
* [User guide](UserGuide.md): This guide contains examples on how to use Gson in your code
* [Troubleshooting guide](Troubleshooting.md): Describes how to solve common issues when using Gson
* [Change log](CHANGELOG.md): Changes in the recent versions
* [Design document](GsonDesignDocument.md): This document discusses issues we faced while designing Gson. It also includes a comparison of Gson with other Java libraries that can be used for Json conversion
Please use the ['gson' tag on StackOverflow](https://stackoverflow.com/questions/tagged/gson) or the [google-gson Google group](https://groups.google.com/group/google-gson) to discuss Gson or to post questions.
### Related Content Created by Third Parties
* [Gson Tutorial](https://www.studytrails.com/java/json/java-google-json-introduction/) by `StudyTrails`
* [Gson Tutorial Series](https://futurestud.io/tutorials/gson-getting-started-with-java-json-serialization-deserialization) by `Future Studio`
* [Gson API Report](https://abi-laboratory.pro/java/tracker/timeline/gson/)
### License
Gson is released under the [Apache 2.0 license](LICENSE).
```
Copyright 2008 Google Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
```
### Disclaimer
This is not an officially supported Google product.
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gson-gson-parent-2.10.1.tar.gz (267个子文件)
bnd.bnd 657B
proguard.cfg 1KB
testcases-proguard.conf 956B
.gitignore 201B
.gitignore 50B
Gson.java 61KB
JsonReaderTest.java 59KB
JsonReader.java 53KB
GsonBuilder.java 36KB
TypeAdapters.java 34KB
PrimitiveTest.java 34KB
DefaultTypeAdaptersTest.java 25KB
JsonWriterTest.java 25KB
MapTest.java 23KB
$Gson$Types.java 23KB
ReflectiveTypeAdapterFactory.java 22KB
ObjectTest.java 22KB
JsonWriter.java 21KB
ParameterizedTypesTest.java 20KB
LinkedTreeMap.java 19KB
GsonTest.java 18KB
CustomTypeAdaptersTest.java 17KB
ProtoTypeAdapter.java 17KB
ReflectionAccessFilterTest.java 16KB
ConstructorConstructor.java 15KB
CollectionTest.java 15KB
Java17RecordTest.java 15KB
ISO8601Utils.java 14KB
JsonReaderPathTest.java 14KB
JsonArray.java 14KB
TypeToken.java 13KB
ParseBenchmark.java 13KB
JsonElement.java 12KB
TestTypes.java 12KB
TypeAdapter.java 11KB
JsonAdapterAnnotationOnFieldsTest.java 11KB
JsonTreeReader.java 11KB
JsonElementReaderTest.java 11KB
PerformanceTest.java 11KB
JsonPrimitiveTest.java 11KB
RuntimeTypeAdapterFactory.java 11KB
GraphAdapterBuilder.java 11KB
JsonObjectTest.java 11KB
TypeTokenTest.java 11KB
ReflectionHelper.java 10KB
UtcDateTypeAdapter.java 10KB
DefaultDateTypeAdapterTest.java 10KB
JsonArrayTest.java 10KB
ArrayTest.java 10KB
InheritanceTest.java 9KB
StreamingTypeAdaptersTest.java 9KB
MapTypeAdapterFactory.java 9KB
NamingPolicyTest.java 9KB
EnumTest.java 9KB
JsonPrimitive.java 9KB
NullObjectAndFieldTest.java 9KB
JsonAdapterAnnotationOnClassesTest.java 9KB
JsonObject.java 8KB
JsonObjectAsMapTest.java 8KB
ProtosWithAnnotationsTest.java 8KB
ReflectionAccessFilter.java 8KB
RuntimeTypeAdapterFactoryTest.java 8KB
JsonTreeWriterTest.java 8KB
RuntimeTypeAdapterFactoryFunctionalTest.java 8KB
Excluder.java 8KB
ExclusionStrategyFunctionalTest.java 8KB
MixedStreamTest.java 7KB
TypeHierarchyAdapterTest.java 7KB
JsonArrayAsListTest.java 7KB
LinkedTreeMapTest.java 7KB
GsonBuilderTest.java 7KB
FieldNamingPolicy.java 7KB
CustomDeserializerTest.java 7KB
TreeTypeAdapter.java 7KB
ReadersWritersTest.java 7KB
JsonAdapterSerializerDeserializerTest.java 7KB
TypeAdapterFactory.java 6KB
TypeAdapterPrecedenceTest.java 6KB
TypeAdapterRuntimeTypeWrapperTest.java 6KB
JsonTreeWriter.java 6KB
GraphAdapterBuilderTest.java 6KB
VersioningTest.java 6KB
GsonTypeAdapterTest.java 6KB
DefaultDateTypeAdapter.java 6KB
InterceptorTest.java 6KB
ParameterizedTypeFixtures.java 6KB
MoreSpecificTypeSerializationTest.java 6KB
JsonParserTest.java 6KB
ToNumberPolicyFunctionalTest.java 6KB
TreeTypeAdaptersTest.java 5KB
ToNumberPolicyTest.java 5KB
ExposeFieldsTest.java 5KB
ObjectTypeAdapter.java 5KB
MapAsArrayTypeAdapterTest.java 5KB
JsonTreeReaderTest.java 5KB
JsonParser.java 5KB
UncategorizedTest.java 5KB
Streams.java 5KB
CollectionsDeserializationBenchmark.java 5KB
StringTest.java 5KB
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