JAXB @XmlIDREF @XmlID工作令人惊讶 [英] jaxb @XmlIDREF @XmlID work amazingly
本文介绍了JAXB @XmlIDREF @XmlID工作令人惊讶的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
JAXB @XmlIDREF @XmlID惊人的工作。
我的XML输入
＆LT;＆系GT;
＆LT;课程与GT;
＆LT;当然ID =1单位=4级=本科生NAME =编程基础/＆GT;
＆LT;当然ID =2单位=3级=本科生NAME =高级编程＆GT;
＆LT; pre＆GT; 1 LT; / pre＆GT;
＆LT; /当然＆GT;
＆LT;当然ID =3单位=3级=本科生NAME =离散数学＆GT;
＆LT; pre＆GT; 1 LT; / pre＆GT;
＆LT; /当然＆GT;
＆LT;当然ID =4单位=3级=本科生NAME =数据结构/＆GT;
＆LT;当然ID =5单位=3级=本科生NAME =数据库系统＆GT;
＆LT; pre＆GT; 4℃; / pre＆GT;
＆所述; pre→2＆下; / $ P $差异无显着
＆LT; /当然＆GT;
＆LT;当然ID =6单位=3级=本科生NAME =因特网工程＆GT;
＆LT; pre＆GT; 4℃; / pre＆GT;
＆所述; pre→2＆下; / $ P $差异无显着
＆所述; CO＆GT; 5℃/ CO＆GT;
＆LT; /当然＆GT;
＆LT;当然ID =7单位=3级=GRADNAME =形式化方法/＆GT;
＆LT;当然ID =8单位=3级=GRADNAME =高级网络/＆GT;
＆LT;当然ID =9单位=3级=本科生NAME =管理学基础/＆GT;
＆LT;当然ID =10单位=3级=本科生NAME =IT基础/＆GT;
＆LT;当然ID =11单位=3级=本科生NAME =多媒体/＆GT;
＆LT;当然ID =12单位=3级=本科生NAME =网络安全/＆GT;
＆LT;当然ID =13单位=3级=本科生NAME =网络学习/＆GT;
＆LT; /课程＆GT;
＆LT;＆PROFS GT;
＆所述;教授的firstName =RamtinID =1/＆GT;
＆LT;教授的firstName =艾哈迈德ID =2/＆GT;
＆所述;教授的firstName =HeshamID =3/＆GT;
＆LT;教授的firstName =FatemehID =4/＆GT;
＆LT;教授的firstName =马哈茂德ID =5/＆GT;
＆LT;教授的firstName =MahmoudrezaID =6/＆GT;
＆LT;教授的firstName =FattanehID =7/＆GT;
＆LT;教授的firstName =AzadehID =8/＆GT;
＆LT;教授的firstName =SiamakID =9/＆GT;
＆LT; / PROFS＆GT;
＆LT;条款和GT;
＆所述术语的id =1＆GT;
＆LT;产品标识=1=教授6当然=1节=1时间=1产能=10/＆GT;
＆LT;产品标识=2教授=1当然=2一节=1时间=1产能=10/＆GT;
＆LT;产品标识=3教授=9当然=3一节=1时间=2容量=10/＆GT;
＆LT;产品标识=4教授=3当然=4一节=1时间=3容量=10/＆GT;
＆LT;产品标识=5教授=1当然=7部分=1时=6容量=10/＆GT;
＆LT; /术语GT;
＆所述的术语GT;
＆LT;产品标识=6教授=1当然=2一节=1时间=5容量=10/＆GT;
＆LT;产品标识=7教授=9当然=3一节=1时=6容量=10/＆GT;
＆LT;产品标识=8教授=4当然=8节=1时=6容量=10/＆GT;
＆LT;产品标识=9教授=2当然=1节=1时间=1产能=10/＆GT;
＆LT; /术语GT;
＆LT; /条款和GT;
＆LT;学生和GT;
＆LT;学生的firstName =古拉姆姓氏=Patoobaf程序=1ID =810190420＆GT;
＆LT; studyrec级=9.0发行=1状态=失败/＆GT;
＆LT; studyrec级=0.0发行=9状态=INPROGRESS/＆GT;
＆LT; /学生＆GT;
＆LT;学生的firstName =Ghamar姓氏=Aghrabparast程序=1ID =810190421＆GT;
＆LT; studyrec级=16.0发行=1状态=通过/＆GT;
＆LT; studyrec级=0.0发行=6状态=INPROGRESS/＆GT;
＆LT; studyrec级=0.0发行=7状态=INPROGRESS/＆GT;
＆LT; /学生＆GT;
＆LT; /生＆GT;
＆LT; /部门＆GT;
我对元素的java类：提供
进口javax.xml.bind.annotation *。@XmlAccessorType（XmlAccessType.FIELD）
公共类发售{
@XmlAttribute
@XmlID
私人字符串ID;
@XmlAttribute
@XmlIDREF
私人教授教授;
@XmlAttribute
@XmlIDREF
私人课程学习;
@XmlAttribute
私人弦乐部分;
@XmlAttribute
私人字符串的时间;
@XmlAttribute
私人诠释能力; 公共无效setCapacity（INT容量）{
this.capacity =能力;
} 公众诠释getCapacity（）{
返回能力;
} 公共无效setCourse（课程学习）{
this.course =课程;
} 公共课程getCourse（）{
返回课程;
} 公共无效SETID（字符串ID）{
this.id = ID;
} 公共字符串的getId（）{
返回ID;
} 公共无效setProf（教授教授）{
this.prof =教授;
} 公共getProf教授（）{
返回教授;
} 公共无效setSection（字符串部分）{
this.section =部分;
} 公共字符串getSection（）{
返回段;
} 公共无效的setTime（字符串时间）{
this.time =时间;
} 公共字符串的getTime（）{
返回时间;
} @覆盖
公共布尔等于（对象T）{
如果（T的instanceof发售）{
如果（（（发售）T）.getId（）。等于（this.id））{
返回true;
}
}
返回false;
}}
我对元素的java类：教授
进口javax.xml.bind.annotation *。
@XmlAccessorType（XmlAccessType.FIELD）
公共类{教授
@XmlAttribute
私有String的firstName;
@XmlAttribute
@XmlID
私人字符串ID; 公共无效SETID（字符串ID）{
this.id = ID;
} 公共无效setFirstname（字符串名字）{
this.firstName =名字;
} 公共字符串的getFirstName（）{
返回的firstName;
} 公共字符串的getId（）{
返回ID;
}}
所以，如果我只是加载并输入文件保存到另一个文件
令人惊讶的我看到这一点：
在提供要素其中教授id是小于6中，prog属性没有示出，并且在Java上下文空
但随着6教授ID或产品的更多有教授属性正确
此事件也发生了发行过程属性，但是9，而不是6
正如你看到我下面的输出的一部分：
...
＆所述;提供ID =1教授=6节=1时间=1容量=10/＆GT;
＆LT;产品标识=2一节=1时间=1产能=10/＆GT;
＆LT;产品标识=3教授=9一节=1时间=2容量=10/＆GT;
＆LT;产品标识=4一节=1时间=3容量=10/＆GT;
＆LT;产品标识=5节=1时=6容量=10/＆GT;
...
有例如JAXB没有规则可以正常使用该输入XML不只是ID大于6：
＆LT;产品标识=1教授=3当然=1节=1时间=1产能=10/＆GT;
＆LT;产品标识=2教授=3当然=2一节=1时间=1产能=10/＆GT;
＆LT;产品标识=3教授=9当然=3一节=1时间=2容量=10/＆GT;
＆LT;产品标识=4教授=8当然=4一节=1时间=3容量=10/＆GT;
＆LT;产品标识=5教授=6当然=7部分=1时=6容量=10/＆GT;
解决方案
我的问题通过实施IDResolver解决
jaxb @XmlIDREF @XmlID work amazingly
my xml input is
<dept>
<courses>
<course id="1" units="4" level="UNDERGRAD" name="Fundamentals of Programming"/>
<course id="2" units="3" level="UNDERGRAD" name="Advanced Programming">
<pre>1</pre>
</course>
<course id="3" units="3" level="UNDERGRAD" name="Discrete Mathematics">
<pre>1</pre>
</course>
<course id="4" units="3" level="UNDERGRAD" name="Data Structures"/>
<course id="5" units="3" level="UNDERGRAD" name="Database Systems">
<pre>4</pre>
<pre>2</pre>
</course>
<course id="6" units="3" level="UNDERGRAD" name="Internet Engineering">
<pre>4</pre>
<pre>2</pre>
<co>5</co>
</course>
<course id="7" units="3" level="GRAD" name="Formal Methods"/>
<course id="8" units="3" level="GRAD" name="Advanced Networks"/>
<course id="9" units="3" level="UNDERGRAD" name="Fundamentals of Management"/>
<course id="10" units="3" level="UNDERGRAD" name="Fundamentals of IT"/>
<course id="11" units="3" level="UNDERGRAD" name="Multimedia"/>
<course id="12" units="3" level="UNDERGRAD" name="Network Security"/>
<course id="13" units="3" level="UNDERGRAD" name="Elearning"/>
</courses>
<profs>
<prof firstName="Ramtin" id="1"/>
<prof firstName="Ahmad" id="2"/>
<prof firstName="Hesham" id="3"/>
<prof firstName="Fatemeh" id="4"/>
<prof firstName="Mahmood" id="5"/>
<prof firstName="Mahmoudreza" id="6"/>
<prof firstName="Fattaneh" id="7"/>
<prof firstName="Azadeh" id="8"/>
<prof firstName="Siamak" id="9"/>
</profs>
<terms>
<term id="1">
<offering id="1" prof="6" course="1" section="1" time="1" capacity="10"/>
<offering id="2" prof="1" course="2" section="1" time="1" capacity="10"/>
<offering id="3" prof="9" course="3" section="1" time="2" capacity="10"/>
<offering id="4" prof="3" course="4" section="1" time="3" capacity="10"/>
<offering id="5" prof="1" course="7" section="1" time="6" capacity="10"/>
</term>
<term>
<offering id="6" prof="1" course="2" section="1" time="5" capacity="10"/>
<offering id="7" prof="9" course="3" section="1" time="6" capacity="10"/>
<offering id="8" prof="4" course="8" section="1" time="6" capacity="10"/>
<offering id="9" prof="2" course="1" section="1" time="1" capacity="10"/>
</term>
</terms>
<students>
<student firstName="Gholam" lastName="Patoobaf" program="1" id="810190420">
<studyrec grade="9.0" offering="1" status="FAILED"/>
<studyrec grade="0.0" offering="9" status="INPROGRESS"/>
</student>
<student firstName="Ghamar" lastName="Aghrabparast" program="1" id="810190421">
<studyrec grade="16.0" offering="1" status="PASSED"/>
<studyrec grade="0.0" offering="6" status="INPROGRESS"/>
<studyrec grade="0.0" offering="7" status="INPROGRESS"/>
</student>
</students>
</dept>
my java class for element: offering
import javax.xml.bind.annotation.*;
@XmlAccessorType(XmlAccessType.FIELD)
public class Offering {
@XmlAttribute
@XmlID
private String id;
@XmlAttribute
@XmlIDREF
private Prof prof;
@XmlAttribute
@XmlIDREF
private Course course;
@XmlAttribute
private String section;
@XmlAttribute
private String time;
@XmlAttribute
private int capacity;
public void setCapacity(int capacity) {
this.capacity = capacity;
}
public int getCapacity() {
return capacity;
}
public void setCourse(Course course) {
this.course = course;
}
public Course getCourse() {
return course;
}
public void setId(String id) {
this.id = id;
}
public String getId() {
return id;
}
public void setProf(Prof prof) {
this.prof = prof;
}
public Prof getProf() {
return prof;
}
public void setSection(String section) {
this.section = section;
}
public String getSection() {
return section;
}
public void setTime(String time) {
this.time = time;
}
public String getTime() {
return time;
}
@Override
public boolean equals(Object t) {
if (t instanceof Offering) {
if(((Offering)t).getId().equals(this.id)) {
return true;
}
}
return false;
}
}
my java class for element: Prof
import javax.xml.bind.annotation.*;
@XmlAccessorType(XmlAccessType.FIELD)
public class Prof {
@XmlAttribute
private String firstName;
@XmlAttribute
@XmlID
private String id;
public void setId(String id) {
this.id = id;
}
public void setFirstname(String firstname) {
this.firstName = firstname;
}
public String getFirstname() {
return firstName;
}
public String getId() {
return id;
}
}
so if i simply load and save the input file to another file i amazingly see this: in offering elements which the prof id is less than 6, the prog attribute is not shown and are null in java context but offerings with prof id of 6 or more have the prof attribute properly
this event also occurs for course attribute of offering but for 9 instead of 6 as you see part of my output below:
...
<offering id="1" prof="6" section="1" time="1" capacity="10"/>
<offering id="2" section="1" time="1" capacity="10"/>
<offering id="3" prof="9" section="1" time="2" capacity="10"/>
<offering id="4" section="1" time="3" capacity="10"/>
<offering id="5" section="1" time="6" capacity="10"/>
...
it has no rule for example jaxb works properly for this input xml not just for id greater than 6:
<offering id="1" prof="3" course="1" section="1" time="1" capacity="10"/>
<offering id="2" prof="3" course="2" section="1" time="1" capacity="10"/>
<offering id="3" prof="9" course="3" section="1" time="2" capacity="10"/>
<offering id="4" prof="8" course="4" section="1" time="3" capacity="10"/>
<offering id="5" prof="6" course="7" section="1" time="6" capacity="10"/>
解决方案
my problem resolved by implementing an IDResolver
这篇关于JAXB @XmlIDREF @XmlID工作令人惊讶的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
