[英]Serializing array with Jackson
我正在序列化以下模型:
class Foo {
private List<String> fooElements;
}
如果fooElements
包含字符串'one','two'和'three。 JSON包含一個字符串:
{
"fooElements":[
"one, two, three"
]
}
我怎么能讓它看起來像這樣:
{
"fooElements":[
"one", "two", "three"
]
}
我通過添加自定義序列化器來實現它:
class Foo {
@JsonSerialize(using = MySerializer.class)
private List<String> fooElements;
}
public class MySerializer extends JsonSerializer<Object> {
@Override
public void serialize(Object value, JsonGenerator jgen, SerializerProvider provider)
throws IOException, JsonProcessingException {
List<String> fooList = (List<String>) value;
if (fooList.isEmpty()) {
return;
}
String fooValue = fooList.get(0);
String[] fooElements = fooValue.split(",");
jgen.writeStartArray();
for (String fooValue : fooElements) {
jgen.writeString(fooValue);
}
jgen.writeEndArray();
}
}
如果你正在使用傑克遜,那么以下簡單的例子對我有用。
定義Foo類:
public class Foo {
private List<String> fooElements = Arrays.asList("one", "two", "three");
public Foo() {
}
public List<String> getFooElements() {
return fooElements;
}
}
然后使用獨立的Java應用程序:
import java.io.IOException;
import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectMapper;
public class JsonExample {
public static void main(String[] args) throws JsonGenerationException, JsonMappingException, IOException {
Foo foo = new Foo();
ObjectMapper mapper = new ObjectMapper();
System.out.println(mapper.writeValueAsString(foo));
}
}
輸出:
{ “fooElements”:[ “一”, “二”, “三”]}
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