Java 使用Genson和Jersey解析帖子中的JSON日期

快速介绍（可以跳过）： 大家好，关于这个话题有很多问题和答案，但有时候解决方案很简单，你甚至都不去想，因为我已经浪费了很多时间，所以我想发布一个所有答案的补充

问题： 您有一个JSON REST服务，该服务处理POST请求以保存JSON对象，但该对象包含一个日期字段，而Genson不会对该字段进行开箱解析

Java对象：

public class MyObj {

    // The field you want to serialize/deserialize
    private Date date;

    // Constructor with no arguments needed by Genson
    public MyObj() {}
}

@Path("/api/my-obj")
public class MyObjAPI {

    @POST
    @Consumes("application/json")
    public Response insert(MyObj myObj) {
        // do what you want with myObj, it's ready to use with the date
        return Response.created('url/to/created/object').build();
    }
}

// This is the JSON Object to POST
var myObj = {
    date: new Date()
};

$.ajax({
    method: 'POST',
    url: '/api/my-obj',
    data: JSON.stringify(myObj),
    dataType: 'json',
    processData: false,
    contentType: 'application/json'
});

球衣的剩余服务：

public class MyObj {

    // The field you want to serialize/deserialize
    private Date date;

    // Constructor with no arguments needed by Genson
    public MyObj() {}
}

@Path("/api/my-obj")
public class MyObjAPI {

    @POST
    @Consumes("application/json")
    public Response insert(MyObj myObj) {
        // do what you want with myObj, it's ready to use with the date
        return Response.created('url/to/created/object').build();
    }
}

// This is the JSON Object to POST
var myObj = {
    date: new Date()
};

$.ajax({
    method: 'POST',
    url: '/api/my-obj',
    data: JSON.stringify(myObj),
    dataType: 'json',
    processData: false,
    contentType: 'application/json'
});

带有jQuery的javascript客户端：

public class MyObj {

    // The field you want to serialize/deserialize
    private Date date;

    // Constructor with no arguments needed by Genson
    public MyObj() {}
}

@Path("/api/my-obj")
public class MyObjAPI {

    @POST
    @Consumes("application/json")
    public Response insert(MyObj myObj) {
        // do what you want with myObj, it's ready to use with the date
        return Response.created('url/to/created/object').build();
    }
}

// This is the JSON Object to POST
var myObj = {
    date: new Date()
};

$.ajax({
    method: 'POST',
    url: '/api/my-obj',
    data: JSON.stringify(myObj),
    dataType: 'json',
    processData: false,
    contentType: 'application/json'
});

---

解决方案：

public class MyObj {

    // The field you want to serialize/deserialize
    private Date date;

    // Constructor with no arguments needed by Genson
    public MyObj() {}
}

@Path("/api/my-obj")
public class MyObjAPI {

    @POST
    @Consumes("application/json")
    public Response insert(MyObj myObj) {
        // do what you want with myObj, it's ready to use with the date
        return Response.created('url/to/created/object').build();
    }
}

// This is the JSON Object to POST
var myObj = {
    date: new Date()
};

$.ajax({
    method: 'POST',
    url: '/api/my-obj',
    data: JSON.stringify(myObj),
    dataType: 'json',
    processData: false,
    contentType: 'application/json'
});

Genson提供了一种定义日期如何（反）序列化的简单方法，这是您在任何地方都可以找到的解决方案：

@Provider
public class GensonProvider implements ContextResolver<Genson> {

    private final Genson genson = new GensonBuilder()
            .useDateAsTimestamp(false)
            .useDateFormat(new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"))
            .create();

    @Override
    public Genson getContext(Class<?> type) {
        return genson;
    }
}

而不是：

import java.sql.Date;

---

我自己解决了这个问题，但在StackOverflow的任何地方都找不到，这是一个愚蠢的错误，太简单了，你想不起来（像我一样），我希望它能帮助别人。

顺便说一句，Genson也使用带参数的构造函数。只需通过GensonBuilder.useConstructorWithArguments启用它（true）