Fastjson过滤器用法

fastjson git地址：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

过滤name属性

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);

类过滤器

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);

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);

NameFilter和ValueFilter都实现了SerializeFilter

SerializeFilter · alibaba/fastjson Wiki · GitHub