Fastjson过滤器用法

本是古典何须时尚 2024-03-16 09:20 46阅读 0赞

fastjson git地址：[https://github.com/alibaba/fastjson/wiki][https_github.com_alibaba_fastjson_wiki]

##  ##

## SimplePropertyPreFilter 用法 ##

用于过滤某个属性

SimplePropertyPreFilter filter = new SimplePropertyPreFilter();
            filter.getExcludes().add("gender");
            A a = new A(1,"zhangsan","gender");
            String json = JSON.toJSONString(a,filter);
            System.out.println(json);

过滤gender属性

![36eea52f3ece48c8b20fc4c17ea7b78b.png][]

过滤name属性

![3a56472f2eb8445f87c94b81ef276265.png][]

## PropertyFilter ##

也可以自己写 PropertyFilter

其中object 是要转成json的对象，name是属性名，value是属性值，可以根据自己的需求自定义

SimplePropertyPreFilter 实现了 PropertyPreFilter

return true表示会返回回来；return false表示过滤掉了

当然new PropertyFilter()也可以改成lambda的形式，那么更简介

PropertyFilter propertyFilter = new PropertyFilter() {
                @Override
                public boolean apply(Object object, String name, Object value) {
                    if(name.equals("gender")){
                        return true;
                    }
                    return false;
                }
            };
            A a = new A(2, "lisi", "男");
            String json = JSON.toJSONString(a,propertyFilter);
            System.out.println(json);

![1128318ddfbe45368db343dd2b2f60a0.png][]

## 类过滤器 ##

> [Class\_Level\_SerializeFilter · alibaba/fastjson Wiki · GitHub][Class_Level_SerializeFilter _ alibaba_fastjson Wiki _ GitHub]

## NameFilter ##

对属性名进行修改

把所有属性名都大写

NameFilter nameFilter = new NameFilter() {
                @Override
                public String process(Object object, String name, Object value) {
                    return name.toUpperCase();
                }
            };
            // 对A类添加过滤器
            SerializeConfig.getGlobalInstance().addFilter(A.class, nameFilter);
            A a = new A(3,"wangwu","女");
            String s = JSON.toJSONString(a);
            System.out.println(s);

![ba4f259091e14113b1465e64946ec961.png][]

## ValueFilter ##

对value进行修改

ValueFilter valueFilter = (object, name, value) -> name + "-" + value;
            SerializeConfig.getGlobalInstance().addFilter(A.class, valueFilter);
            A a = new A(4,"zhaoliu","女");
            String s = JSON.toJSONString(a);
            System.out.println(s);

![3875f4f9772447b2be555f20b16f32f3.png][]

NameFilter和ValueFilter都实现了**SerializeFilter**

> [SerializeFilter · alibaba/fastjson Wiki · GitHub][SerializeFilter _ alibaba_fastjson Wiki _ GitHub]

![155f90a81c674a74a382c5553fedde15.png][]

[https_github.com_alibaba_fastjson_wiki]: https://github.com/alibaba/fastjson/wiki
[36eea52f3ece48c8b20fc4c17ea7b78b.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/16/af1b9958c8c444dea2c4a9d2cbbf95cb.png
[3a56472f2eb8445f87c94b81ef276265.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/16/d71c1427a00a4817a817ca4746711f4b.png
[1128318ddfbe45368db343dd2b2f60a0.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/16/e293e66012f842c69885ddd73b6e18d5.png
[Class_Level_SerializeFilter _ alibaba_fastjson Wiki _ GitHub]: https://github.com/alibaba/fastjson/wiki/Class_Level_SerializeFilter
[ba4f259091e14113b1465e64946ec961.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/16/d7beda8846ee40d8ae984310e5ded5f1.png
[3875f4f9772447b2be555f20b16f32f3.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/16/9f7bdbf3d4d44979bf02ad8b36b7518b.png
[SerializeFilter _ alibaba_fastjson Wiki _ GitHub]: https://github.com/alibaba/fastjson/wiki/SerializeFilter
[155f90a81c674a74a382c5553fedde15.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/16/3761f356c19e4ff99b53a2a8b4b88a33.png