我們通常對一個json串和java對象進行互轉時，經常會有選擇性的過濾掉一些屬性值。例如下面的類：

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public class Person { ????private String name; ????private String address; ????private String sex; ????public String getAddress() ????{ ????????return address; ????} ????public void setAddress(String address) ????{ ????????this.address = address; ????} ????public String getName() ????{ ????????return name; ????} ????public void setName(String name) ????{ ????????this.name = name; ????} ????public String getSex() ????{ ????????return sex; ????} ????public void setSex(String sex) ????{ ????????this.sex = sex; ????} }

如果我想過濾address屬性怎么辦？

方法一：實現JSONString接口

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import net.sf.json.JSONString; public class Person implements JSONString { ????private String name; ????private String sex; ????private String address; ????public String toJSONString() ????{ ????????return "{\"name\":\"" + name + "\",\"sex\":\"" + sex + "\"}"; ????} ????public String getAddress() ????{ ????????return address; ????} ????public void setAddress(String address) ????{ ????????this.address = address; ????} ????public String getName() ????{ ????????return name; ????} ????public void setName(String name) ????{ ????????this.name = name; ????} ????public String getSex() ????{ ????????return sex; ????} ????public void setSex(String sex) ????{ ????????this.sex = sex; ????} } import net.sf.json.JSONObject; public class Test { public static void main(String args[]) { ?????? Person person = new Person(); ????????person.setName("swiftlet"); ????????person.setSex("men"); ????????person.setAddress("china"); ????????JSONObject json = JSONObject.fromObject(person); ????????System.out.println(json.toString()); ????} }

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方法二：設置jsonconfig實例，對包含和需要排除的屬性進行添加或刪除。

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import net.sf.json.JSONObject; import net.sf.json.JsonConfig; public class Test { ????public static void main(String args[]) ????{ ????????Person person = new Person(); ????????person.setName("swiftlet"); ????????person.setSex("men"); ????????person.setAddress("china"); ????????JsonConfig jsonConfig = new JsonConfig(); ????????jsonConfig.setExcludes(new String[] ????????{ "address" }); ????????JSONObject json = JSONObject.fromObject(person, jsonConfig); ????????System.out.println(json.toString()); ????} }

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方法三：使用propertyFilter實例過濾屬性。

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import net.sf.json.JSONObject; import net.sf.json.JsonConfig; import net.sf.json.util.PropertyFilter; public class Test { ????public static void main(String args[]) ????{ ????????Person person = new Person(); ????????person.setName("swiftlet"); ????????person.setSex("men"); ????????person.setAddress("china"); ????????JsonConfig jsonConfig = new JsonConfig(); ????????jsonConfig.setJsonPropertyFilter(new PropertyFilter() { ????????????public boolean apply(Object source, String name, Object value) ????????????{ ????????????????return source instanceof Person && name.equals("address"); ????????????} ????????}); ????????JSONObject json = JSONObject.fromObject(person, jsonConfig); ????????System.out.println(json.toString()); ????} }

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