您应该将
JSON反序列化与应用程序的其他部分分开。您不能为所有响应实现一种方法，但是响应数量可能有限，并且可以为每个类声明一些简单方法。通常，您只能使用一种具有如下声明的方法：
public <T> T deserialise(String payload, Class<T> expectedClass) { Objects.requireNonNull(payload); Objects.requireNonNull(expectedClass); try { return mapper.readValue(payload, expectedClass); } catch (IOException e) { throw new IllegalStateException("JSON is not valid!", e); }}现在，您可以反序列化所需的所有有效负载。您需要提供要接收的
JSON有效负载和
POJO类。
显示该概念的简单工作解决方案：
import com.fasterxml.jackson.core.JsonProcessingException;import com.fasterxml.jackson.databind.DeserializationFeature;import com.fasterxml.jackson.databind.ObjectMapper;import com.fasterxml.jackson.databind.SerializationFeature;import java.io.IOException;import java.util.Objects;public class JsonMapper { private final ObjectMapper mapper = new ObjectMapper(); public JsonMapper() { // configure mapper instance if required mapper.enable(SerializationFeature.INDENT_OUTPUT); mapper.enable(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT); // etc... } public String serialise(Object value) { try { return mapper.writevalueAsString(value); } catch (JsonProcessingException e) { throw new IllegalStateException("Could not generate JSON!", e); } } public <T> T deserialise(String payload, Class<T> expectedClass) { Objects.requireNonNull(payload); Objects.requireNonNull(expectedClass); try { return mapper.readValue(payload, expectedClass); } catch (IOException e) { throw new IllegalStateException("JSON is not valid!", e); } } public Foo parseResponseFoo(String payload) { return deserialise(payload, Foo.class); } public Bar parseResponseBar(String payload) { return deserialise(payload, Bar.class); } public static void main(String[] args) { JsonMapper jsonMapper = new JsonMapper(); String bar = "{"bar" : 2}"; System.out.println(jsonMapper.parseResponseBar(bar)); String foo = "{"foo" : 1}"; System.out.println(jsonMapper.parseResponseFoo(foo)); System.out.println("General method:"); System.out.println(jsonMapper.deserialise(foo, Foo.class)); System.out.println(jsonMapper.deserialise(bar, Bar.class)); }}class Foo { public int foo; @Override public String toString() { return "Foo{" + "foo=" + foo + '}'; }}class Bar { public int bar; @Override public String toString() { return "Bar{" + "bar=" + bar + '}'; }}
