fastjson调用JSON.toJSONString自动忽略null值的key

喜欢ヅ旅行 2022-12-01 14:23 204阅读 0赞

public class TestFastJson { 
    
        public static void main(String[] args) { 
    
            Map<java.lang.String, Object> email = new HashMap<>();
            email.put("toArray", new String[]{ "587129955","191519"});
            email.put("ccArray", null);
            email.put("subject", "消灭复仇者联盟");
            email.put("sponsor", "灭霸");
            email.put("meetingRoom", "斯坦尔星球");
            email.put("startTime", "2020-08-10 12:00:00");
            email.put("endTime", "2020-08-10 12:30:00");
            email.put("changeReason", "会议邀请!");
            String jsonString1 = JSON.toJSONString(email);
    // Gson gson = new Gson();
    // String jsonString1 = gson.toJson(email);
            System.out.println(jsonString1);
        }
    }

打印结果:  
ccArray已经丢失…我把数据交给你,你动手动脚…  
GSON也是这个德性

{ "sponsor":"灭霸","meetingRoom":"斯坦尔星球","changeReason":"会议邀请!","subject":"消灭复仇者联盟","toArray":["587129955","191519"],"startTime":"2020-08-10 12:00:00","endTime":"2020-08-10 12:30:00"}

底层方法:

public static String toJSONString(Object object, SerializeConfig config, SerializeFilter[] filters, String dateFormat, int defaultFeatures, SerializerFeature... features) { 
            SerializeWriter out = new SerializeWriter((Writer)null, defaultFeatures, features);
    
            String var15;
            try { 
                JSONSerializer serializer = new JSONSerializer(out, config);
                if (dateFormat != null && dateFormat.length() != 0) { 
                    serializer.setDateFormat(dateFormat);
                    serializer.config(SerializerFeature.WriteDateUseDateFormat, true);
                }
    
                if (filters != null) { 
                    SerializeFilter[] var8 = filters;
                    int var9 = filters.length;
    
                    for(int var10 = 0; var10 < var9; ++var10) { 
                        SerializeFilter filter = var8[var10];
                        serializer.addFilter(filter);
                    }
                }
    			//序列化写的时候会把null值的key干掉
                serializer.write(object);
                var15 = out.toString();
            } finally { 
                out.close();
            }
    
            return var15;
        }

public final void write(Object object) { 
            if (object == null) { 
                this.out.writeNull();
            } else { 
            	//class是HashMap
                Class<?> clazz = object.getClass();
                ObjectSerializer writer = this.getObjectWriter(clazz);
    
                try { 
                    writer.write(this, object, (Object)null, (Type)null, 0);
                } catch (IOException var5) { 
                    throw new JSONException(var5.getMessage(), var5);
                }
            }
        }