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ContextValueFilter

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wenshao edited this page Apr 19, 2016 · 6 revisions

在某些场景下，对Value做过滤，需要获得所属JavaBean的信息，包括类型、字段、方法等。在fastjson-1.2.9中，提供了ContextValueFilter，类似于之前版本提供的ValueFilter，只是多了BeanContext参数可用。

package com.alibaba.fastjson.serializer;

public interface ContextValueFilter extends SerializeFilter {
    Object process(BeanContext context, 
                   Object object, 
                   String name, 
                   Object value);
}

其中SerializeContext的定义如下：

package com.alibaba.fastjson.serializer;

public final class BeanContext {
    public Class<?> getBeanClass();

    public Method getMethod();

    public Field getField();

    public String getName();

    public String getLabel();

    public <T extends Annotation> T getAnnation(Class<T> annotationClass);
}

Sample

ContextValueFilter valueFilter = new ContextValueFilter() {
    public Object process(SerializeContext context, 
                          Object object, 
                          String name, 
                          Object value) {
        Class<?> objectClass = context.getBeanClass();
        UrlIdentify annotation = context.getAnnation(UrlIdentify.class);
        
        // ....
        
        return value;
    }
};

JSON.toJSONString(model, valueFilter);

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