1. Fastjson API ParseProcess简介

ParseProcess是编程扩展定制反序列化的接口。fastjson支持如下ParseProcess：

• ExtraProcessor 用于处理多余的字段
• ExtraTypeProvider 用于处理多余字段时提供类型信息

2. 使用ExtraProcessor 处理多余字段

public static class VO { private int id; private Map attributes = new HashMap(); public int getId() { return id; } public void setId(int id) { this.id = id;} public Map getAttributes() { return attributes;} } ExtraProcessor processor = new ExtraProcessor() { public void processExtra(Object object, String key, Object value) { VO vo = (VO) object; vo.getAttributes().put(key, value); } }; VO vo = JSON.parseObject("{\"id\":123,\"name\":\"abc\"}", VO.class, processor); Assert.assertEquals(123, vo.getId()); Assert.assertEquals("abc", vo.getAttributes().get("name"));

3. 使用ExtraTypeProvider 为多余的字段提供类型

public static class VO { private int id; private Map attributes = new HashMap(); public int getId() { return id; } public void setId(int id) { this.id = id;} public Map getAttributes() { return attributes;} } class MyExtraProcessor implements ExtraProcessor, ExtraTypeProvider { public void processExtra(Object object, String key, Object value) { VO vo = (VO) object; vo.getAttributes().put(key, value); } public Type getExtraType(Object object, String key) { if ("value".equals(key)) { return int.class; } return null; } }; ExtraProcessor processor = new MyExtraProcessor(); VO vo = JSON.parseObject("{\"id\":123,\"value\":\"123456\"}", VO.class, processor); Assert.assertEquals(123, vo.getId()); Assert.assertEquals(123456, vo.getAttributes().get("value")); // value本应该是字符串类型的，通过getExtraType的处理变成Integer类型了。