java 工作杂记 @上源码

矫情吗；* 2023-10-04 14:04 37阅读 0赞

AOP参数获取

Object\[\] params = joinPoint.getArgs();  
MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature();  
Map map = new HashMap<>();  
for (int i = 0 ; i < parameterNames.length; i++)\{  
map.put(parameterNames\[i\], params\[i\]);  
\}

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Springboot 单测  
@RunWith(SpringRunner.class)  
@ActiveProfiles("dev")  
@SpringBootTest

\-Dspring.profiles.active=dev

mvn clean install -DskipTests=true

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mybatis开启驼峰自动转换模式  
mybatis.configuration.map-underscore-to-camel-case=true

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MapUtils.getString(hashMap, "errcode")

Collections.EMPTY\_LIST

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feign 时间转换

@JsonFormat( pattern="yyyy-MM-dd HH:mm:ss",timezone = "GMT+8")

spring.jackson.date-format=yyyy-MM-dd HH:mm:ss  
spring.jackson.time-zone=GMT+8

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import com.fasterxml.jackson.databind.annotation.JsonDeserialize; import com.fasterxml.jackson.databind.annotation.JsonSerialize;

@JsonSerialize(using = LongJsonSerializer.class)

@JsonDeserialize(using = LongJsonDeserializer.class)

用户处理前端Long类型数据丢失精度问题，将后端long类型转换成String类型，将前端的String类型转换成long类型

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import com.alibaba.fastjson.JSON;
    import com.alibaba.fastjson.JSONObject;
    import com.fasterxml.jackson.databind.ObjectMapper;
    import com.google.gson.Gson;
    import java.util.Map;
    
    public class JsonTest {
    
        private static ObjectMapper objectMapper = new ObjectMapper();
        private static Gson gson = new Gson();
        private static JSONObject jsonObject = new JSONObject();
    
        public static void main(String[] args) throws Exception {
            Demo demo = new Demo();
            String jsonStr = gson.toJson(demo);
            jsonStr = objectMapper.writeValueAsString(demo);
            jsonStr = jsonObject.toJSONString(demo);
            String json = "{\"cmd\":\"1\",\"sss\":\"dd\"}";
            Map map = gson.fromJson(json, Map.class);
            map = objectMapper.readValue(json, Map.class);
            map = jsonObject.parseObject(json, Map.class);
            JSONObject jsonObject = JSON.parseObject(json);
        }
    
    }

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