[英]FasterXML - Jackson XML extension translate values to null in pojo
我決定給我的項目中的Jackson XML一個將XML字符串轉換為POJO的機會。
因此,我使用以下出色的網站從我的xml字符串生成pojo。
因此,它創建了我所需的類,然后嘗試將xml值讀取到這些對象中。
不幸的是,一些值在對象中被設置為null,我不知道為什么:
這是xml字符串的開頭:
<?xml version="1.0" encoding="UTF-8"?>
<schedule xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" generated_at="2018-02-23T16:55:45+00:00" xmlns="http://schemas.thesite.com/jobsapi/v1/myjob" xsi:schemaLocation="http://schemas.thesite.com/jobsapi/v1/myjob http://schemas.thesite.com/asb/myjob/v1/xml/endpoints/myjob/schedule.xsd">
<job_event id="sr:task:12004724" scheduled="2018-02-23T17:00:00+00:00" start_time_tbd="false" status="not_started">
<task type="group" number="23"/>
我的課程是:
public class Schedule
{
private String generated_at;
private String xmlns;
private Job_event[] job_events;
public String getGenerated_at ()
{
return generated_at;
}
public void setGenerated_at (String generated_at)
{
this.generated_at = generated_at;
}
public String getXmlns ()
{
return xmlns;
}
public void setXmlns (String xmlns)
{
this.xmlns = xmlns;
}
public Job_event[] getjob_events ()
{
return job_events;
}
public void setjob_events (Job_event[] job_events)
{
this.job_events = job_events;
}
@Override
public String toString()
{
return "Schedule [generated_at = "+generated_at+", xmlns = "+xmlns+", job_events = "+job_events+"]";
}
}
和
public class Job_event {
private String id;
private String scheduled;
private String start_time_tbd;
private String status;
//more fields, getters and setters
}
然后,我使用它將字符串轉換為pojos:
ObjectMapper xmlMapper = new XmlMapper();
xmlMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
Schedule sched = xmlMapper.readValue(xmlString, Schedule.class);
Job_event[] job_events = sched.getJob_events();
而且我在job_events的每個事件值中發現,成員值(例如id和status)以及其余的均為null。
這是為什么? xml字符串可以。
謝謝!
您可以通過執行以下操作來修復它
@JacksonXmlProperty(isAttribute = true)
批注將Pojo字段映射到XML屬性 List
而不是數組 @JacksonXmlElementWrapper(useWrapping = false)
批注表示您的列表List<JobEvent>
被表示為重復的XML元素。 localName
注釋字段 ,以保持與Java命名約定的兼容性。 之后,它看起來像
@JsonIgnoreProperties(ignoreUnknown = true)
public class JobEvent {
@JacksonXmlProperty(isAttribute = true)
private String id;
@JacksonXmlProperty(isAttribute = true)
private String scheduled;
@JacksonXmlProperty(isAttribute = true, localName = "start_time_tbd")
private String startTimeTbd;
@JacksonXmlProperty(isAttribute = true)
private String status;
@Override
public String toString() {
return id + " " + scheduled + " " + " " + startTimeTbd + " " + status;
}
}
Schedule.java
public class Schedule {
@JacksonXmlProperty(isAttribute = true,localName="generated_at")
public String generatedAt;
@JacksonXmlProperty(isAttribute = true)
public String xmlns;
@JacksonXmlElementWrapper(useWrapping = false)
public List<JobEvent> job_event;
@Override
public String toString()
{
return "Schedule [generated_at = "+generatedAt+", xmlns = "+xmlns+", job_events = "+job_event.toString()+"]";
}
}
測試電話
@Test
public void readXmlToSelfDefinedPojo2() throws Exception {
ObjectMapper mapper = new XmlMapper();
Schedule pojo = mapper.readValue(
Thread.currentThread().getContextClassLoader().getResourceAsStream("48963966.xml"),
Schedule.class);
System.out.println(pojo + "");
}
對於XML文件48963966.xml
將打印
Schedule [generated_at = 2018-02-23T16:55:45+00:00, xmlns = null, job_events = [sr:task:12004724 2018-02-23T17:00:00+00:00 false not_started, sr:task:12004725 2018-02-25T17:00:00+00:00 false not_started]]
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