js遇到long过长,精度损失,所以改为使用string来传输,但是将long字段改成String的代价太大了,所以直接让fastjson吧long转换成了String
但是@ResponseBody 返回的是Jackson来序列化的,所以要让spring的消息转换器换成fastjson
maven:
<!-- https://mvnrepository.com/artifact/com.alibaba/fastjson --> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.45</version> </dependency>
1.配置@ResponseBody使用fastjson
<mvc:annotation-driven> <!-- 重新设置@RequestMapping中对@ResponseBody以String类型消息转换器的字符集 --> <mvc:message-converters register-defaults="true"> <bean class="org.springframework.http.converter.StringHttpMessageConverter"> <constructor-arg value="UTF-8" /> </bean> <bean class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter"> <property name="supportedMediaTypes"> <list> <value>text/html;charset=UTF-8</value> <value>application/json</value> <value>application/xml;charset=UTF-8</value> </list> </property> <property name="features"> <list> <!-- 默认的意思就是不配置这个属性,配置了就不是默认了 --> <!-- 是否输出值为null的字段 ,默认是false--> <value>WriteMapNullValue</value> <value>WriteNullNumberAsZero</value> <value>WriteNullListAsEmpty</value> <value>WriteNullStringAsEmpty</value> <value>WriteNullBooleanAsFalse</value> <value>WriteDateUseDateFormat</value> </list> </property> </bean> </mvc:message-converters> </mvc:annotation-driven>
2.long转string
import java.io.IOException; import java.lang.reflect.Type; import com.alibaba.fastjson.serializer.JSONSerializer; import com.alibaba.fastjson.serializer.ObjectSerializer; import com.alibaba.fastjson.serializer.SerializeWriter; public class LongToStringSerializer implements ObjectSerializer { public static final LongToStringSerializer instance = new LongToStringSerializer(); @Override public void write(JSONSerializer serializer, Object object, Object fieldName, Type fieldType, int features) throws IOException { SerializeWriter out = serializer.out; if (object == null) { out.writeNull(); return; } String strVal = object.toString(); out.writeString(strVal); } }
@JSONField(serializeUsing = LongToStringSerializer.class)
private long id;
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