我想借助 Spring MVC ModelAttribute (Person) 和 Jackson 从 html 表单创建一个 xml。
形式:
....
<input name="name"/>
<input name="birthday"/>
<input name="address.street/>
<input name="address.city/>
....
POJO:
@JacksonXmlRootElement(localName = "person")
@JsonInclude(Include.NON_DEFAULT)
public class Person implements Serializable {
@JsonIgnore
private Long id;
@JacksonXmlProperty(localName = "name")
private String name;
@JacksonXmlProperty(localName = "email")
private String email;
@JacksonXmlProperty(localName = "address")
private Address address;
private String birthday;
//getter and setter
}
@JsonInclude(Include.NON_EMPTY)
public class Address implements Serializable {
private Long id;
private String street;
private String streetNumber;
private String postalcode;
private String city;
//getter and setter
}
在 Controller 中创建 XML:
@RequestMapping("saveperson")
public String savePerson(@ModelAttribute final Person person, final ModelMap model) {
final ObjectMapper xmlMapper = new XmlMapper();
final String xml = xmlMapper.writeValueAsString(person);
return "redirect:/listpersons";
}
输出 xml:
<person>
<name>John</name>
<email>john@test.com</email>
<address/>
</person>
如何从 XML 中排除空对象?
我试图将 ModelAttribute 中的所有空字符串设置为 null:
@InitBinder
public void initBinder(WebDataBinder binder) {
binder.registerCustomEditor(String.class, new StringTrimmerEditor(true));
}
但它不起作用。 我也试过 @JsonInclude(Include.NON_EMPTY) 和@JsonInclude(Include.NON_NULL) 但它始终在 XML 中包含空对象。
我的第二个问题是:当我想将地址列表绑定(bind)到 html 表单时。执行此操作的最佳方法是什么?
....
<input name="name"/>
<input name="birthday"/>
<input name="address1.street/>
<input name="address1.city/>
<input name="address2.street/>
<input name="address2.city/>
....
@JacksonXmlRootElement(localName = "person")
@JsonInclude(Include.NON_DEFAULT)
public class Person implements Serializable {
@JsonIgnore
private Long id;
@JacksonXmlProperty(localName = "name")
private String name;
@JacksonXmlProperty(localName = "email")
private String email;
@JsonIgnore
private Address address1;
@JsonIgnore
private Address address2;
//add address1 and address2 in the getter or dto for the ModelAttribute?
@JacksonXmlElementWrapper(localName = "addresses")
@JacksonXmlProperty(localName = "address")
private List<Address> address;
private String birthday;
//getter and setter
}
谢谢!
最佳答案
克里斯在这里!
我刚遇到这个问题,很高兴看到有人问了同样的问题,但很遗憾没有人回答。
经过修补,我找到了两个可能的解决方案来解决您的第一个问题,即不在 XML 输出中包含空值。
首先是在我的模型之上包含 @JsonInclude(JsonInclude.Include.NON_EMPTY)
。所以对于你来说,在这种情况下,我怀疑这会起作用:
@JacksonXmlRootElement(localName = "person")
@JsonInclude(JsonInclude.Include.NON_EMPTY)
public class Person implements Serializable {
@JsonIgnore
private Long id;
@JacksonXmlProperty(localName = "name")
private String name;
@JacksonXmlProperty(localName = "email")
private String email;
@JacksonXmlProperty(localName = "address")
private Address address;
private String birthday;
//getter and setter
}
这消除了您之前的 Include.NON_DEFAULT
,我希望如果您走这条路,您也可以没有它。
其次,似乎还有一个我没有采用的替代解决方案,它会让我们像这样直接更改 XmlMapper:
XmlMapper xmlMapper = new XmlMapper();
xmlMapper.setSerializationInclusion(JsonInclude.Include.NON_EMPTY);
我希望其中之一能有所帮助,迟了十个月。
关于java - Jackson xml在序列化时忽略空对象,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/38441941/