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代码是间接复制过去，格局比拟乱大家对付看一下吧
需要要保留字段原样，可fastjson默认是获取get办法的字段并把首字母转成小写。
解决方案：
1、增加实例化配置
JSON.toJSONString(须要实例化的对象,new SerializeConfig(true)) //设置true通过字段作为json key,默认为flase注：代码省略 大抵在1821行
package com.alibaba.fastjson.util;public class TypeUtils{ public static SerializeBeanInfo buildBeanInfo(Class<?> beanType // , Map<String,String> aliasMap // , PropertyNamingStrategy propertyNamingStrategy // , boolean fieldBased // ){ List<FieldInfo> fieldInfoList = fieldBased //通过SerializeConfig办法设置fieldBased这个字段影响了如何获取字段 ? computeGettersWithFieldBase(beanType, aliasMap, false, propertyNamingStrategy) : computeGetters(beanType, jsonType, aliasMap, fieldCacheMap, false, propertyNamingStrategy); } }computeGettersWithFieldBase 办法大略是这样 Field[] fields = currentClass.getDeclaredFields();computeFields(currentClass, aliasMap, propertyNamingStrategy, fieldInfoMap, fields); //有注解优先获取注解字段2、字段加上@JSONField（name="字段名称"）
computeGetters办法是通过过来get办法作为json的key
注：代码省略 大抵在2015行
public static List<FieldInfo> computeGetters(Class<?> clazz, // JSONType jsonType, // Map<String,String> aliasMap, // Map<String,Field> fieldCacheMap, // boolean sorted, // PropertyNamingStrategy propertyNamingStrategy // ){ char c3 = methodName.charAt(3); String propertyName; Field field = null; if(Character.isUpperCase(c3) // || c3 > 512 // for unicode method name ){ if(compatibleWithJavaBean){ propertyName = decapitalize(methodName.substring(3));//去掉 ‘get’ 并转首字母小写 }然而加上@JSONField注解会优先应用注解字段为key
注：大抵在2066行 同上办法
JSONField fieldAnnotation = null; if(field != null){ fieldAnnotation = TypeUtils.getAnnotation(field, JSONField.class); if(fieldAnnotation != null){ if(!fieldAnnotation.serialize()){ continue; } ordinal = fieldAnnotation.ordinal(); serialzeFeatures = SerializerFeature.of(fieldAnnotation.serialzeFeatures()); parserFeatures = Feature.of(fieldAnnotation.parseFeatures()); if(fieldAnnotation.name().length() != 0){ fieldAnnotationAndNameExists = true; propertyName = fieldAnnotation.name(); //获取注解的name属性 if(aliasMap != null){ propertyName = aliasMap.get(propertyName); if(propertyName == null){ continue; } } }