json对象转字符串key值首字母变小写问题

实体类

package com.star.json;

import com.alibaba.fastjson.annotation.JSONField;
import lombok.AllArgsConstructor;
import lombok.Data;


@Data
@AllArgsConstructor
public class Course {
    // @JSonField(name = "COURSENAME")
    private String COURSENAME;
}

package com.star.json;

import com.alibaba.fastjson.annotation.JSONField;
import lombok.AllArgsConstructor;
import lombok.Data;


@Data
@AllArgsConstructor
public class Student {
    // @JSonField(name = "NAME")
    private String NAME;

    // @JSonField(name = "AGE")
    private int AGE;
    // @JSonField(name = "COURSE")
    private Course COURSE;

}

测试类:三种解决方案详细见代码

package com.star.json;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.PascalNameFilter;
import com.google.gson.Gson;


public class JSonTest {
    public static void main(String[] args) {
        Course course = new Course("ENGLISH");
        Student student = new Student("zhangsan", 18, course);

        // 方案一 ：new PascalNameFilter() fastjson出现重复引用或者循环引用
        // 参考https://blog.csdn.net/u012060033/article/details/85999897
        String jsonStr1 = JSON.toJSonString(student,new PascalNameFilter());
        System.out.println(jsonStr1);

        // 方案二: Gson 转换 更推荐
        Gson gson = new Gson();
        String jsonStr2 = gson.toJson(student);
        System.out.println(jsonStr2);

        // 方案三: 使用@JSonField(name = "NAME")
        String jsonStr3 = JSON.toJSonString(student);
        System.out.println(jsonStr3);

    }
}

 调试结果

  方案一 ：new PascalNameFilter() fastjson出现重复引用或者循环引用
    参考http:// https://blog.csdn.net/u012060033/article/details/85999897