JSONObject.toJSONString首字母大小写问题的三种解决方案

我会带着你远行 2023-06-05 15:58 14阅读 0赞

# 1、在字段上加注解@JSONField #

package com.cjh.wechatmp.po;
    
    import com.alibaba.fastjson.annotation.JSONField;
    import lombok.Data;
    import lombok.NoArgsConstructor;
    
    @NoArgsConstructor
    @Data
    public class InMessageText {
    
        @JSONField(name = "ToUserName")
        private String ToUserName;
        @JSONField(name = "FromUserName")
        private String FromUserName;
        private String CreateTime;
        private String MsgType;
        private String Content;
        private String MsgId;
    }

优点：少量的话简单方便

缺点：入侵性强，懒得每个加

# 2、自定义配置 #

优点： 逼格高

缺点：并不是忽略不转，而是转了小写，再转回来大写

package com.wechat.util;
    
    import java.util.Map;
    import net.sf.json.JSONException;
    import net.sf.json.JSONObject;
    import net.sf.json.JsonConfig;
    import net.sf.json.util.JavaIdentifierTransformer;
    import net.sf.json.util.PropertySetStrategy;
    
    public class JsonUtil {
    
        public static Object toBean(JSONObject jsonObject, Class rootClass,
            String[] ignoreLowercase, Map<String, Class> childClass) {
            JsonConfig config = new JsonConfig();
    
            //转换对象
            config.setRootClass(rootClass);
    
            //首字母小写
            config.setJavaIdentifierTransformer(new JavaIdentifierTransformer() {
                @Override
                public String transformToJavaIdentifier(String str) {
                    if (ignoreLowercase.length > 0) {
                        for (String item : ignoreLowercase) {
                            if (str.indexOf(item) == 0) {
                                return str;
                            }
                        }
                    }
                    char[] chars = str.toCharArray();
                    chars[0] = Character.toLowerCase(chars[0]);
                    return new String(chars);
                }
            });
    
            //对象里没有的属性忽略
            config.setPropertySetStrategy(new PropertySetStrategy() {
                @Override
                public void setProperty(Object o, String s, Object o1) throws JSONException {
                    try {
                        PropertySetStrategy.DEFAULT.setProperty(o, s, o1);
                    } catch (JSONException e) {
                    }
                }
            });
    
            //自定义的list声明
            if (childClass != null) {
                config.setClassMap(childClass);
            }
    
            return JSONObject.toBean(jsonObject, config);
        }
    
    }

# 3、用Gson代替(推荐) #

优点：简单方便

缺点：要添加依赖，不过不会和之前的冲突哦

<dependency>
          <groupId>com.google.code.gson</groupId>
          <artifactId>gson</artifactId>
          <version>2.8.5</version>
        </dependency>

效果：

InMessageText(ToUserName=toUser, FromUserName=fromUser, CreateTime=1348831860, MsgType=text, Content=this is a test, MsgId=1234567890123456)
    <xml><Content><![CDATA[this is a test]]></Content><CreateTime><![CDATA[1348831860]]></CreateTime><ToUserName><![CDATA[toUser]]></ToUserName><FromUserName><![CDATA[fromUser]]></FromUserName><MsgType><![CDATA[text]]></MsgType><MsgId><![CDATA[1234567890123456]]></MsgId></xml>
    Gson--->{"ToUserName":"toUser","FromUserName":"fromUser","CreateTime":"1348831860","MsgType":"text","Content":"this is a test","MsgId":"1234567890123456"}
    JSONObject--->{"content":"this is a test","createTime":"1348831860","fromUserName":"fromUser","msgId":"1234567890123456","msgType":"text","toUserName":"toUser"}