fastjson序列化 将Null设置为空字符串等问题
如果只是想解决springmvc+fastjson的配置相关问题以及如标题所述问题,可以看:http://www.cnblogs.com/exmyth/p/4563673.html fastjson有一个枚举类控制输出的格式,可以根据不一样的类型单独设置输出格式,例如:值为null的属性是否输出该字段,值为Null的字段如何处理输出等等。 JavaBean就是通过JavaBeanSerializer处理的,如标题的解决办法 class ccc{
public BigDecimal getBbb() {
return bbb;
}
public void setBbb(BigDecimal bbb) {
this.bbb = bbb;
}
public String getUsername() {
return username;
}
public BigDecimal bbb;
public void setUsername(String username) {
this.username = username;
}
private String username;
}
测试main: ccc c = new ccc();
JSON.toJSONString(c,SerializerFeature.WriteMapNullValue,SerializerFeature.WriteNullStringAsEmpty)
类型为Number,也就是以下所有类型,可以将Null设置为0,不能设置为空字符串,若想解决该问题,自己可以写一个转换器: ccc c = new ccc();
JSON.toJSONString(c,SerializerFeature.WriteNullNumberAsZero)
fastjson:属性为null值的处理逻辑,如下源码: if (propertyValue == null) {
Class<?> runtimeFieldClass = runtimeInfo.runtimeFieldClass;
SerializeWriter out = serializer.out;
if (Number.class.isAssignableFrom(runtimeFieldClass)) {
out.writeNull(features,SerializerFeature.WriteNullNumberAsZero.mask);
return;
} else if (String.class == runtimeFieldClass) {
out.writeNull(features,SerializerFeature.WriteNullStringAsEmpty.mask);
return;
} else if (Boolean.class == runtimeFieldClass) {
out.writeNull(features,SerializerFeature.WriteNullBooleanAsFalse.mask);
return;
} else if (Collection.class.isAssignableFrom(runtimeFieldClass)) {
out.writeNull(features,SerializerFeature.WriteNullListAsEmpty.mask);
return;
}
ObjectSerializer fieldSerializer = runtimeInfo.fieldSerializer;
if ((out.isEnabled(SerializerFeature.WriteMapNullValue))
&& fieldSerializer instanceof JavaBeanSerializer) {
out.writeNull();
return;
}
fieldSerializer.write(serializer,null,fieldInfo.name,fieldInfo.fieldType,fieldFeatures);
return;
}
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