public class Student implements Serializable{ 
  
    @JsonProperty("name") 
    private String trueName; 
  
    public String getTrueName() { 
        return trueName; 
    } 
  
    public void setTrueName(String trueName) { 
        this.trueName = trueName; 
    } 
} 

/*测试*/
public class Main { 
    public static void main(String[] args) throws JsonProcessingException { 
        Student student = new Student(); 
        student.setTrueName("张三");  

       //使用writeValuesAsString的方法就可以把对角转化成json字符串。

        System.out.println(new ObjectMapper().writeValueAsString(student)); 
    } 
}

得到结果
{"name":"张三"}