fastjs转化序列化对象时，属性为空（null）的转化为“”（空字
符串）
对规则的理解：
1. SerializerFeature.WriteMapNullValue 是否输出值为null的字段，默认为false
也就是说有null时会输出⽽不是忽略（默认策略是忽略，所以看不到为null的字段）
2. WriteNullStringAsEmpty—字符类型字段如果为null，输出为”“,⽽⾮null
注意是字段是字段是字段，⽽不是json.put("key",null)，所以⽤它时，字段为null的可以转换为空字符串。
3. 如果让输出的json中所有为null的字符串都变成空字符串，最简单的做法就是加⼀个值过滤器，这样就避免了有的字段为null，有的字
段为空字符的现象。
贴点⽰例代码
}
输出结果：
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public boolean isMale() {
return isMale;
}
public void setMale(boolean isMale) {
this.isMale = isMale;
}
{"isMale":true,"name":"zhangsan","classmates":[{"age":0,"male":false},{"age":11,"male":false},
{"age":13,"gf":{"$ref":"$.classmates[1]"},"male":true,"name":"张三"}],"fav":{"sports":[],"musics":["北京欢迎你","画⼼"],"history":["史记","三国"],"arts": []},"age":13}
{"str":null,"isMale":true,"name":"zhangsan","classmates":[{"age":0,"gf":null,"male":false,"name":""},{"age":11,"gf":null,"male":false,"name":""}, {"age":13,"gf":{"$ref":"$.classmates[1]"},"male":true,"name":"张三"}],"fav":{"sports":[],"musics":["北京欢迎你","画⼼"],"history":["史记","三国"],"arts": []},"age":13,"gf":null}
{"str":"","isMale":true,"name":"zhangsan","classmates":[{"age":0,"gf":"","male":false,"name":""},{"age":11,"gf":"","male":false,"name":""}, {"age":13,"gf":{"$ref":"$.classmates[1]"},"male":true,"name":"张三"}],"fav":{"sports":[],"musics":["北京欢迎你","画⼼"],"history":["史记","三国"],"arts": []},"age":13,"gf":""}
fastjson忽略属性{"isMale":true,"name":"zhangsan","classmates":[{"age":0,"male":false},{"age":11,"male":false},
{"age":13,"gf":{"$ref":"$.classmates[1]"},"male":true,"name":"张三"}],"fav":{"sports":[],"musics":["北京欢迎你","画⼼"],"history":["史记","三国"],"arts": []},"age":13}
{"str":"","isMale":true,"name":"zhangsan","classmates":[{"age":0,"gf":"","male":false,"name":""},{"age":11,
"gf":"","male":false,"name":""}, {"age":13,"gf":{"$ref":"$.classmates[1]"},"male":true,"name":"张三"}],"fav":{"sports":[],"musics":["北京欢迎你","画⼼"],"history":["史记","三国"],"arts": []},"age":13,"gf":""}
{"key":{"isMale":true,"name":"zhangsan","classmates":[{"age":0,"male":false},{"age":11,"male":false},
{"age":13,"gf":{"$ref":"$.key.classmates[1]"},"male":true,"name":"张三"}],"fav":{"sports":[],"musics":["北京欢迎你","画⼼"],"history":["史记","三国"],"arts":[]},"age":13}}
{"key":{"str":"","isMale":true,"name":"zhangsan","classmates":[{"age":0,"gf":"","male":false,"name":""},{"age":11,"gf":"","male":false,"name":""}, {"age":13,"gf":{"$ref":"$.key.classmates[1]"},"male":true,"name":"张三"}],"fav":{"sports":[],"musics":["北京欢迎你","画⼼"],"history":["史记","三国"],"arts":[]},"age":13,"gf":""}}
bar()---------------------------
{"age":13,"gf":{"age":11,"gf":null,"male":false,"name":""},"male":true,"name":"张三"}
{"age":13,"gf":{"age":11,"gf":null,"male":false,"name":null},"male":true,"name":"张三"}
{"age":13,"gf":{"age":11,"male":false},"male":true,"name":"张三"}
{"age":13,"gf":{"age":11,"male":false},"male":true,"name":"张三"}
{"age":13,"gf":{"age":11,"gf":"","male":false,"name":""},"male":true,"name":"张三"}
{"age":13,"gf":{"age":11,"gf":"","male":false,"name":""},"male":true,"name":"张三"}

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