Java Jackson mixin:如何将类中的字段忽略或重命名为树
我正试图从表示为树的类中进行深层过滤(重命名/忽略字段) 使用Jackson Mixin,我可以从根级别重命名或忽略字段。我想要实现的是如何在多个级别上进行过滤(重命名/忽略) 例如,我有一棵树,它有两个类。类A是根,B是树中深度的第二级。通过应用Jackson Mxiin,我想从根A过滤属性a2,从B过滤属性b1 表示根类的类AJava Jackson mixin:如何将类中的字段忽略或重命名为树,java,jackson,mixins,objectmapper,Java,Jackson,Mixins,Objectmapper,我正试图从表示为树的类中进行深层过滤(重命名/忽略字段) 使用Jackson Mixin,我可以从根级别重命名或忽略字段。我想要实现的是如何在多个级别上进行过滤(重命名/忽略) 例如,我有一棵树,它有两个类。类A是根,B是树中深度的第二级。通过应用Jackson Mxiin,我想从根A过滤属性a2,从B过滤属性b1 表示根类的类A public class A { private String a1; private String a2; private B b; public
public class A {
private String a1;
private String a2;
private B b;
public A(String a1, String a2, B b) {
this.a1 = a1;
this.a2 = a2;
this.b = b;
}
public String getA1() {
return a1;
}
public void setA1(String a1) {
this.a1 = a1;
}
public String getA2() {
return a2;
}
public void setA2(String a2) {
this.a2 = a2;
}
public B getB() {
return b;
}
public void setB(B b) {
this.b = b;
}
}
public interface AMixIn {
// Filter for A (implemented to filter second depth as well)
@JsonIgnore
String getA2();
@JsonIgnore
public BMixIn getB();
}
public interface BMixIn {
// Filter for B
@JsonIgnore
public String getB1();
}
B级-二级深度
public class B {
private String b1;
private String b2;
public B(String b2, String b1) {
this.b1 = b1;
this.b2 = b2;
}
public String getB1() {
return b1;
}
public void setB1(String b1) {
this.b1 = b1;
}
public String getB2() {
return b2;
}
public void setB2(String b2) {
this.b2 = b2;
}
}
过滤器
public class A {
private String a1;
private String a2;
private B b;
public A(String a1, String a2, B b) {
this.a1 = a1;
this.a2 = a2;
this.b = b;
}
public String getA1() {
return a1;
}
public void setA1(String a1) {
this.a1 = a1;
}
public String getA2() {
return a2;
}
public void setA2(String a2) {
this.a2 = a2;
}
public B getB() {
return b;
}
public void setB(B b) {
this.b = b;
}
}
public interface AMixIn {
// Filter for A (implemented to filter second depth as well)
@JsonIgnore
String getA2();
@JsonIgnore
public BMixIn getB();
}
public interface BMixIn {
// Filter for B
@JsonIgnore
public String getB1();
}
测试
public class SecondLevelTest {
// Test
private ObjectMapper mapper = null;
private ObjectWriter writer = null;
@Before
public void setUp() {
// init
mapper = new ObjectMapper();
mapper.setMixIns(ImmutableMap.<Class<?>, Class<?>>of(A.class, AMixIn.class));
writer = mapper.writer().with(SerializationFeature.INDENT_OUTPUT);
}
@Test
public void rename_field_jackson() throws JsonProcessingException {
B b = new B("vb1", "vb2");
A a = new A("va1", "va2", b);
// I want to get this result
// {
// "a1" : "va1",
// "b2" : "vb2"
// }
String json = writer.writeValueAsString(a);
System.out.println(json);
}
}
公共类二级测试{
//试验
私有对象映射器映射器=null;
私有ObjectWriter=null;
@以前
公共作废设置(){
//初始化
映射器=新的ObjectMapper();
setMixIns(ImmutableMap.>of(A.class,AMixIn.class));
writer=mapper.writer(),带有(SerializationFeature.INDENT_输出);
}
@试验
public void rename_field_jackson()引发JsonProcessingException{
B=新的B(“vb1”、“vb2”);
A=新的A(“va1”、“va2”、b);
//我想得到这个结果
// {
//“a1”:“va1”,
//“b2”:“vb2”
// }
字符串json=writer.writeValueAsString(a);
System.out.println(json);
}
}
这将为您提供所需的输出。将setUp()
更改为同时使用BMixIn
:
@Before
public void setUp() {
// init
mapper = new ObjectMapper();
mapper.setMixIns(ImmutableMap.of(A.class, AMixIn.class, B.class, BMixIn.class));
writer = mapper.writer().with(SerializationFeature.INDENT_OUTPUT);
}
并将AMixIn
更改为展开B
public interface AMixIn {
// Filter for A (implemented to filter second depth as well)
@JsonIgnore
String getA2();
@JsonUnwrapped
public BMixIn getB();
}
忘记注册BMixIn导致其
@JsonIgnore
永远无法使用@JsonUnwrapped
un nestsb
这样你就得到了一个平面结构。我想你在找。它应该在getB()
上,而不是忽略。我不明白,你能解释一下吗?也许你可以分享如何实现它!