解决json串和实体类字段不一致的问题

public class Student {
 private String name;
 private String sex;
 private Integer age;
 public String getName() {
 return name;
 }
 public String getSex() {
 return sex;
 }
 public Integer getAge() {
 return age;
 }
 public void setName(String name) {
 this.name = name;
 }
 public void setSex(String sex) {
 this.sex = sex;
 }
 public void setAge(Integer age) {
 this.age = age;
 }
 @Override
 public String toString() {
 return "Student [name=" + name + ", sex=" + sex + ", age=" + age + "]";
 }
}

//fastjson 少字段
 @Test
 public void testFastjson01() {
 String jsonStr = "{\"age\":18,\"name\":\"zhangsan\"}";
 Student stu = JSON.parseObject(jsonStr, Student.class);
 System.out.println(stu); // Student [name=zhangsan, sex=null, age=18]
 }

//fastjson 多字段
 @Test
 public void testFastjson02() {
 String jsonStr = "{\"age\":20,\"name\":\"lisi\",\"sex\":\"男\",\"hobby\":\"basketball\"}";
 Student stu = JSON.parseObject(jsonStr, Student.class);
 System.out.println(stu); // Student [name=lisi, sex=男, age=20]
 }

//jackson 少字段
 @Test
 public void testJackson01() throws Exception{
 String jsonStr = "{\"age\":18,\"name\":\"zhangsan\"}";
 ObjectMapper om = new ObjectMapper();
 Student stu = om.readValue(jsonStr, Student.class);
 System.out.println(stu); // Student [name=zhangsan, sex=null, age=18]
 }

//jackson 多字段
 @Test
 public void testJackson02() throws Exception{
 String jsonStr = "{\"age\":20,\"name\":\"lisi\",\"sex\":\"男\",\"hobby\":\"basketball\"}";
 ObjectMapper om = new ObjectMapper();
 Student stu = om.readValue(jsonStr, Student.class);
 System.out.println(stu);
 }

com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "hobby" (class com.cyj.demo03.Student), not marked as ignorable (3 known properties: "name", "sex", "age"])
 at [Source: {"age":20,"name":"lisi","sex":"男","hobby":"basketball"}; line: 1, column: 44] (through reference chain: com.cyj.demo03.Student["hobby"])
 at com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException.from(UnrecognizedPropertyException.java:51)
 at com.fasterxml.jackson.databind.DeserializationContext.reportUnknownProperty(DeserializationContext.java:817)
 at com.fasterxml.jackson.databind.deser.std.StdDeserializer.handleUnknownProperty(StdDeserializer.java:958)
 at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownProperty(BeanDeserializerBase.java:1324)
 at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownVanilla(BeanDeserializerBase.java:1302)
 at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:249)
 at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:136)
 at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3564)
 at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2580)
 at com.cyj.demo03.TestJson.testJackson02(TestJson.java:40)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 at java.lang.reflect.Method.invoke(Method.java:497)
 at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
 at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
 at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
 at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
 at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
 at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
 at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
 at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
 at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
 at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
 at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
 at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
 at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:538)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:760)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:460)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:206)

@JsonProperty("name")
private String userName;