Springboot Jackson 序列化 Long值雪花id 前端失真自定义解决方案

ゝ一世哀愁。 2022-09-02 00:59 310阅读 0赞

# 一、获取JS数值范围 #

使用 `chrome` 浏览器控制台查看 JS 最大最小值  
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# 二、编写自定义处理方案 #

继承 `jackson` 的数值序列化类 `NumberSerializer` 重写 序列化实现

/** * 超出 JS 最大最小值 处理 * * @author Lion Li */
    @JacksonStdImpl
    public class BigNumberSerializer extends NumberSerializer { 
    
    	/** * 根据 JS Number.MAX_SAFE_INTEGER 与 Number.MIN_SAFE_INTEGER 得来 */
    	private static final long MAX_SAFE_INTEGER = 9007199254740991L;
    	private static final long MIN_SAFE_INTEGER = -9007199254740991L;
    
    	/** * 提供实例 */
    	public static final BigNumberSerializer INSTANCE = new BigNumberSerializer(Number.class);
    
    	public BigNumberSerializer(Class<? extends Number> rawType) { 
    		super(rawType);
    	}
    
    	@Override
    	public void serialize(Number value, JsonGenerator gen, SerializerProvider provider) throws IOException { 
    		// 超出范围 序列化位字符串
    		if (value.longValue() > MIN_SAFE_INTEGER && value.longValue() < MAX_SAFE_INTEGER) { 
    			super.serialize(value, gen, provider);
    		} else { 
    			gen.writeString(value.toString());
    		}
    	}
    }

# 三、添加全局序列化类型指定方案 #

/** * jackson 配置 * * @author Lion Li */
    @Slf4j
    @Configuration
    public class JacksonConfig { 
    
    	@Primary
    	@Bean
    	public ObjectMapper objectMapper() { 
    		ObjectMapper objectMapper = new ObjectMapper();
    		// 全局配置序列化返回 JSON 处理
    		SimpleModule simpleModule = new SimpleModule();
    		simpleModule.addSerializer(Long.class, BigNumberSerializer.INSTANCE);
    		simpleModule.addSerializer(Long.TYPE, BigNumberSerializer.INSTANCE);
    		simpleModule.addSerializer(BigInteger.class, BigNumberSerializer.INSTANCE);
    		objectMapper.registerModule(simpleModule);
    		return objectMapper;
    	}
    
    }

# 四、测试功能 #

### 测试代码 ###

@ApiOperation("测试")
    	@GetMapping("/demo")
    	public Demo demo() { 
    		Demo demo = new Demo();
    		// 被序列化位字符串
    		demo.setNumber1(1234567891234567891L);
    		demo.setNumber2(1987654321987654321L);
    		// 依旧为数值
    		demo.setNumber3(55555555555L);
    		demo.setNumber4(1L);
    		return demo;
    	}
    
    	@Data
    	public class Demo { 
    		private Long number1;
    		private long number2;
    		private Long number3;
    		private Long number4;
    	}

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDQ2MTI4MQ_size_16_color_FFFFFF_t_70 1]

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