blocks|key|3240678|text|如果对要排除的子结构具有实际访问权限，请使用瞬态关键字。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|3240679|Java瞬态是一个|3240680|关键字，当成员变量被持久化到字节流时，它会标记为不被序列化。当一个对象通过网络传输时，该对象需要被“序列化”。序列化将对象状态转换为串行字节。这些字节通过网络发送，并从这些字节重新创建对象。由java瞬态关键字标记的成员变量不会被传输，它们是故意丢失的。|blockquote|3240681|3240682|3240683|http://en.wikibooks.org/wiki/Java_Programming/Keywords/transient|3240684|entityMap|0|LINK|mutability|MUTABLE|url^0|M|2|0|0|0|0|0|0|1S|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Y|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|Z|8|@]|D|@]|E|$]]|$1|K|3|-4|5|6|7|10|8|@]|D|@]|E|$]]|$1|L|3|-4|5|6|7|11|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|12|8|@]|D|@$9|13|A|14|1|15]]|E|$]]|$1|O|3|-4|5|6|7|16|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|N]]]]

Use the transient keyword if you have actually access to the substructure you want to exclude.

<blockquote>
 transient is a Java keyword which marks a member variable not to be
 serialized when it is persisted to streams of bytes. When an object is
 transferred through the network, the object needs to be 'serialized'.
 Serialization converts the object state to serial bytes. Those bytes
 are sent over the network and the object is recreated from those
 bytes. Member variables marked by the java transient keyword are not
 transferred, they are lost intentionally.
</blockquote>

<a href="http://en.wikibooks.org/wiki/Java_Programming/Keywords/transient" rel="nofollow">http://en.wikibooks.org/wiki/Java_Programming/Keywords/transient</a>

blocks|key|3878256|text|请为排除类和命名空间提供一个示例，但对于您可能无法控制其源代码的属性，您可以在类型和字段上使用以下内容|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3878257|@JsonIgnoreProperties(value+=+{"propertyName",+"otherProperty"})|code-block|syntax|javascript|3878258|Here's+the+javadoc.|offset|length|3878259|下面是一个例子|3878260|@JsonIgnoreProperties(value+=+{+"name"+})
public+class+Examples+{
++++public+static+void+main(String[]+args)+throws+JsonGenerationException,+JsonMappingException,+IOException+{
++++++++Examples+examples+=+new+Examples();
++++++++examples.setName("sotirios");
++++++++Custom+custom+=+new+Custom();
++++++++custom.setValue("random");
++++++++custom.setNumber(42);
++++++++examples.setCustom(custom);
++++++++ObjectMapper+mapper+=+new+ObjectMapper();
++++++++StringWriter+writer+=+new+StringWriter();

++++++++mapper.writeValue(writer,+examples);
++++++++System.out.println(writer.toString());
++++}

++++private+String+name;

++++@JsonIgnoreProperties(value+=+{+"value"+})
++++private+Custom+custom;

++++public+String+getName()+{
++++++++return+name;
++++}

++++public+void+setName(String+name)+{
++++++++this.name+=+name;
++++}

++++public+Custom+getCustom()+{
++++++++return+custom;
++++}

++++public+void+setCustom(Custom+custom)+{
++++++++this.custom+=+custom;
++++}

++++static+class+Custom+{
++++++++private+String+value;
++++++++private+int+number;
++++++++public+String+getValue()+{
++++++++++++return+value;
++++++++}
++++++++public+void+setValue(String+value)+{
++++++++++++this.value+=+value;
++++++++}
++++++++public+int+getNumber()+{
++++++++++++return+number;
++++++++}
++++++++public+void+setNumber(int+number)+{
++++++++++++this.number+=+number;
++++++++}
++++}
}|3878261|打印|3878262|{"custom":{"number":42}}|3878263|换句话说，它忽略了Examples#name和Custom#value。|style|CODE|3878264|entityMap|0|LINK|mutability|MUTABLE|url|http://fasterxml.github.io/jackson-annotations/javadoc/2.1.0/com/fasterxml/jackson/annotation/JsonIgnoreProperties.html^0|0|0|0|J|0|0|0|0|0|0|9|D|N|C|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|15|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|16|8|@]|9|@$I|17|J|18|1|19]]|A|$]]|$1|K|3|L|5|6|7|1A|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|1B|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|1C|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|1D|8|@]|9|@]|A|$E|F]]|$1|S|3|T|5|6|7|1E|8|@$I|1F|J|1G|U|V]|$I|1H|J|1I|U|V]]|9|@]|A|$]]|$1|W|3|-4|5|6|7|1J|8|@]|9|@]|A|$]]]|X|$Y|$5|Z|10|11|A|$12|13]]]]

Please give an example for exclude classes and namespace but for properties for which you might not control the source code you can use the following on types and fields

<pre><code>@JsonIgnoreProperties(value = {"propertyName", "otherProperty"})
</code></pre>

<a href="http://fasterxml.github.io/jackson-annotations/javadoc/2.1.0/com/fasterxml/jackson/annotation/JsonIgnoreProperties.html" rel="nofollow">Here's the javadoc.</a>

Here's an example

<pre><code>@JsonIgnoreProperties(value = { "name" })
public class Examples {
 public static void main(String[] args) throws JsonGenerationException, JsonMappingException, IOException {
 Examples examples = new Examples();
 examples.setName("sotirios");
 Custom custom = new Custom();
 custom.setValue("random");
 custom.setNumber(42);
 examples.setCustom(custom);
 ObjectMapper mapper = new ObjectMapper();
 StringWriter writer = new StringWriter();

 mapper.writeValue(writer, examples);
 System.out.println(writer.toString());
 }

 private String name;

 @JsonIgnoreProperties(value = { "value" })
 private Custom custom;

 public String getName() {
 return name;
 }

 public void setName(String name) {
 this.name = name;
 }

 public Custom getCustom() {
 return custom;
 }

 public void setCustom(Custom custom) {
 this.custom = custom;
 }

 static class Custom {
 private String value;
 private int number;
 public String getValue() {
 return value;
 }
 public void setValue(String value) {
 this.value = value;
 }
 public int getNumber() {
 return number;
 }
 public void setNumber(int number) {
 this.number = number;
 }
 }
}
</code></pre>

prints

<pre><code>{"custom":{"number":42}}
</code></pre>

In other words, it ignored <code>Examples#name</code> and <code>Custom#value</code>.

I'm trying to serialize a rather large structure with Jackson. 
However, it's also trying to export a lot of substructures I will never need (causing a <code>JsonMappingException: No serializer found for class</code>)

So how can I exclude classes and namespaces from serialization?

Alternatively, how can I flag properties of my classes as excluded/ignored?

Exclude classes and namespaces from serialization?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在尝试用Jackson序列化一个相当大的结构。然而，它也试图导出很多我永远不需要的子结构(导致JsonMappingException: No serializer found for class)那么，如何从序列化中排除类和命名空间呢？或者，如何将类的属性标记为已排除/忽略？

问是否从序列化中排除类和命名空间？
EN

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问是否从序列化中排除类和命名空间？EN