Java 如何在序列化对象时让 Jackson 忽略 get() 方法
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How to make Hymanson ignore a get() method when serializing an object
提问by NoUserFound
I have this code in a class named Project:
我在一个名为的类中有此代码Project：
@Transient
public List<Release> getAllReleases() {
List<Release> releases = new ArrayList<Release>();
...
return releases;
}
When a project object is serialized the getAllReleases()method is called, and an allReleasesfield is added to the serialized object.
当一个项目对象被序列化时，该getAllReleases()方法被调用，并且一个allReleases字段被添加到序列化的对象中。
If I add @JsonIgnorebefore the method I get the same result. So I wonder how can I implement a getFoo()method which is ignored by Hymanson when serializing the object.
如果我@JsonIgnore在方法之前添加，我会得到相同的结果。所以我想知道如何实现一个getFoo()在序列化对象时被Hyman逊忽略的方法。
Alternatively I could do:
或者我可以这样做：
static public List<Release> getAllReleases(Project proj) {
List<Release> releases = new ArrayList<Release>();
...
return releases;
}
but the solution looks a bit ugly, and I'm pretty sure there must be some simpler mechanism provided by Hymanson.
但解决方案看起来有点难看，我很确定Hyman逊必须提供一些更简单的机制。
Am I missing something? TIA
我错过了什么吗？TIA
回答by Excelsior
You need to implement a JSon serializer which does nothing and then set it using @JSonSerialize(using = EmptySerializer.class).
您需要实现一个什么都不做的 JSon 序列化器，然后使用 @JSonSerialize（使用 = EmptySerializer.class）设置它。
Click on the refrence for further example.
单击参考以获取更多示例。
Reference: Hymanson: how to prevent field serialization
回答by Alexey Gavrilov
If you mark the getter method with the @JsonIgnoreannotation it should not be serialized. Here is an example:
如果使用@JsonIgnore注释标记 getter 方法，则不应对其进行序列化。下面是一个例子：
public class HymansonIgnore {
public static class Release {
public final String version;
public Release(String version) {
this.version = version;
}
}
public static class Project {
public final String name;
public Project(String name) {
this.name = name;
}
@JsonIgnore
public List<Release> getAllReleases() {
return Arrays.asList(new Release("r1"), new Release("r2"));
}
}
public static void main(String[] args) throws JsonProcessingException {
ObjectMapper mapper = new ObjectMapper();
System.out.println(mapper.writerWithDefaultPrettyPrinter().writeValueAsString(new Project("test")));
}
}
Output:
输出：
{
"name" : "test"
}
