LabelFilter

在Fastjson 1.2.7版本之后，fastjson提供LabelFilter功能，用于不同的场景定制序列化。

需要使用LabelFilter，首先需要用@JSONField配置label。如：

public static class VO {

    private int    id;
    private String name;
    private String password;
    private String info;

    @JSONField(label = "normal")
    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    @JSONField(label = "normal")
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @JSONField(label = "secret")
    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
    
    public String getInfo() {
        return info;
    }
    
    public void setInfo(String info) {
        this.info = info;
    }
}

根据不同场景过滤，如下：

VO vo = new VO();
vo.setId(123);
vo.setName("wenshao");
vo.setPassword("ooxxx");
vo.setPassword("ooxxx");

String text1 = JSON.toJSONString(vo, Labels.includes("normal"));
Assert.assertEquals("{\"id\":123,\"name\":\"wenshao\"}", text1);

String text2 = JSON.toJSONString(vo, Labels.excludes("secret"));
Assert.assertEquals("{\"id\":123,\"info\":\"fofo\",\"name\":\"wenshao\"}", text2);