我们通常对一个Json串和 Java 对象进行互转时，经常会有选择性的过滤掉一些属性值，而json-lib包中的JsonConfig为我们提供了这种 功能，具体实现方法有以下几种。(1)建立JsonConfig实例，并配置属性排除列表,(2)用属性过滤器,(3)写一个自定义的 JsonBeanProcessor. @H_403_4@ @H_403_4@ 1. 实现JSONString接口的方法 @H_403_4@ @H_403_4@ public class Person implements JSONString { @H_403_4@ private String name; @H_403_4@ private String lastname; @H_403_4@ private Address address; @H_403_4@ @H_403_4@ // getters & setters @H_403_4@ @H_403_4@ public String toJSONString() { @H_403_4@ return "{name:'"+name+"',lastname:'"+lastname+"'}"; @H_403_4@ } @H_403_4@ } @H_403_4@ @H_403_4@ @H_403_4@ 2.第二种方法通过jsonconfig实例，对包含和需要排除的属性进行方便的添加或删除 @H_403_4@ @H_403_4@ public class Person { @H_403_4@ private String name; @H_403_4@ private String lastname; @H_403_4@ private Address address; @H_403_4@ @H_403_4@ // getters & setters @H_403_4@ } @H_403_4@ @H_403_4@ JsonConfig jsonConfig = new JsonConfig();
jsonConfig.setExclusions( new String[]{"address"});
Person bean = new Person("jack","li");
JSON json = JSONSerializer.toJSON(bean,jsonConfig); @H_403_4@ @H_403_4@ 3. 使用propertyFilter可以允许同时对需要排除的属性和类进行控制，这种控制还可以是双向的，也可以应用到json字符串到java对象 @H_403_4@ @H_403_4@ public class Person { @H_403_4@ private String name; @H_403_4@ private String lastname; @H_403_4@ private Address address; @H_403_4@ @H_403_4@ // getters & setters @H_403_4@ } @H_403_4@ @H_403_4@ JsonConfig jsonConfig = new JsonConfig();
jsonConfig.setJsonPropertyFilter( new PropertyFilter(){

public boolean apply(Object source/* 属性的拥有者 */,String name/*属性名字*/,Object value/* 属性值 */){
// return true to skip name
return source instanceof Person && name.equals("address");
}
});
Person bean = new Person("jack","li");
JSON json = JSONSerializer.toJSON( bean,jsonConfig ) @H_403_4@ @H_403_4@ 4. 最后来看JsonBeanProcessor,这种方式和实现JsonString很类似，返回一个代表原来的domain类的合法JSONObject @H_403_4@ @H_403_4@ public class Person { @H_403_4@ private String name; @H_403_4@ private String lastname; @H_403_4@ private Address address; @H_403_4@ @H_403_4@ // getters & setters @H_403_4@ } @H_403_4@ @H_403_4@ JsonConfig jsonConfig = new JsonConfig();
jsonConfig.registerJsonBeanProcessor( Person.class,new JsonBeanProcessor(){

public JSONObject processBean( Object bean,JsonConfig jsonConfig ){
if(!(bean instanceof Person)){
return new JSONObject(true);
}
Person person = (Person) bean;
return new JSONObject() .element( "name",person.getName()) .element( "lastname",person.getLastname());
}
}); @H_403_4@ @H_403_4@ Person bean = new Person("jack","li"); JSON json = JSONSerializer.toJSON( bean,jsonConfig );