json-jackson多子类继承的反序列化

相关文章：
[url]http://wangxinchun.iteye.com/blog/2055677[/url]

本文是一个例子，说明有继承情况下，多个子类的反序列化问题，看看代码吧

import java.util.ArrayList;
import java.util.List;

import org.codehaus.jackson.annotate.JsonSubTypes;
import org.codehaus.jackson.annotate.JsonTypeInfo;
import org.codehaus.jackson.map.ObjectMapper;

/**
 * 
 * @author xinchun.wang 
   @email: [email protected]
 * @createTime 2015-3-24 下午8:27:12
 */
public class JacksonJsonTest {
	public static void main(String[] args) throws Exception {
		List dataList = new ArrayList();
		dataList.add(new C("10", 5));
		dataList.add(new B(8, 5));
		D d = new D();
		d.setList(dataList);
		ObjectMapper mapper = new ObjectMapper();
		String data = mapper.writeValueAsString(d);
		System.out.println(data);
		D result = mapper.readValue(data, D.class);

		System.out.println(result.getList());
	}

	public static class D {
		List list;

		public List getList() {
			return list;
		}

		public void setList(List list) {
			this.list = list;
		}

	}

	@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "typeName")
	@JsonSubTypes({ @JsonSubTypes.Type(value = B.class, name = "B"),
			@JsonSubTypes.Type(value = C.class, name = "C") })
	public static class A {
		protected int a;

		public A() {
		}

		public A(int a) {
			this.a = a;
		}

		public int getA() {
			return a;
		}

		public void setA(int a) {
			this.a = a;
		}

	}

	@JsonTypeInfo(use = JsonTypeInfo.Id.CLASS, property = "typeName")
	public static class B extends A {
		public B() {
		}

		public B(int b, int a) {
			super(a);
		}

		private int b;

		public int getB() {
			return b;
		}

		public void setB(int b) {
			this.b = b;
		}
	}

	@JsonTypeInfo(use = JsonTypeInfo.Id.CLASS, property = "typeName")
	public static class C extends A {
		private String c;

		public C() {
		}

		public C(String c, int a) {
			super(a);
			this.c = c;
		}

		public String getC() {
			return c;
		}

		public void setC(String c) {
			this.c = c;
		}

	}
}

输出：
{"list":[{"typeName":"C","a":5,"c":"10"},{"typeName":"B","a":5,"b":0}]}
[JsonTest$C@7ed75415, JsonTest$B@6ad16fc1]