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。例如下面的类：
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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;
}
}
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如果我想过滤address属性怎么办？
方法一：实现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：设置jsonconfig实例，对包含和需要排除的属性进行添加或删除。
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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实例过滤属性。
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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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