blocks|key|3369342|text|您可以使用XSLT进行预处理。我知道它现在被认为有点“迪斯科”，但它是快速和简单的应用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3369343|从这篇tek-tips讨论中，您可以使用XSLT进行转换以删除空元素。|offset|length|3369344|<xsl:stylesheet+version="1.0"+xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
++<xsl:template+match="@*%7Cnode()">
++++<xsl:if+test=".+!=+''+or+./@*+!=+''">
++++++<xsl:copy>
++++++++<xsl:apply-templates+select="@*%7Cnode()"/>
++++++</xsl:copy>
++++</xsl:if>
++</xsl:template>
</xsl:stylesheet>|code-block|syntax|javascript|3369345|entityMap|0|LINK|mutability|MUTABLE|url|http://www.tek-tips.com/viewthread.cfm?qid=1088712&page=1^0|0|3|8|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@$D|U|E|V|1|W]]|A|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

You could preprocess using XSLT. I know it's considered a bit "Disco" nowadays, but it is fast and easy to apply.

From this <a href="http://www.tek-tips.com/viewthread.cfm?qid=1088712&amp;page=1" rel="noreferrer">tek-tips</a> discussion, you could transform with XSLT to remove empty elements.

<pre><code>&lt;xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"&gt;
 &lt;xsl:template match="@*|node()"&gt;
 &lt;xsl:if test=". != '' or ./@* != ''"&gt;
 &lt;xsl:copy&gt;
 &lt;xsl:apply-templates select="@*|node()"/&gt;
 &lt;/xsl:copy&gt;
 &lt;/xsl:if&gt;
 &lt;/xsl:template&gt;
&lt;/xsl:stylesheet&gt;
</code></pre>

blocks|key|498331|text|我认为您必须编辑您的大型机代码以获得最佳解决方案。当您的大型机生成XML时，您必须告诉它，如果XML为空，就不要输出标记。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|498332|我不认为你可以在客户端做太多的事情。如果您得到的XML中充满了空标记，那么您别无选择，只能全部解析它们--毕竟，如果不以某种方式解析标记，您如何判断它是否为空！|498333|但也许您可以在JAX-B到达之前对XML文本执行正则表达式字符串替换：|498334|String+xml+=+//get+the+XML
xml+=+xml.replaceAll("<.*?/>",+"");|code-block|syntax|javascript|498335|这将删除像"“这样的空标签，但不会删除"”。|498336|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Q|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|R|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I think you'd have to edit your mainframe code for the best solution. When your mainframe generates the XML, you'll have to tell it not to output a tag if it's empty.

There's not much you can do on the client side I don't think. If the XML that you get is filled with empty tags, then you have no choice but to parse them all--after all, how can you tell if a tag is empty without parsing it in some way!

But maybe you could do a regex string replace on the XML text before JAX-B gets to it:

<pre><code>String xml = //get the XML
xml = xml.replaceAll("&lt;.*?/&gt;", "");
</code></pre>

This will remove empty tags like "&lt;city/&gt;" but not "&lt;Address&gt;&lt;/Address&gt;".

blocks|key|3369454|text|据我所知，在JAXB中实现这一点的惟一技术是编写一个定制的XmlAdapter，它将空字符串压缩为null。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3369455|缺点是，您必须将其作为注释添加到代码中的每个元素，如果您有350个元素，这将是乏味的。|3369456|entityMap|0|LINK|mutability|MUTABLE|url|http://java.sun.com/javase/6/docs/api/javax/xml/bind/annotation/adapters/XmlAdapter.html^0|T|A|T|A|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@$9|S|A|T|1|U]]|E|$]]|$1|F|3|G|5|6|7|V|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

The only technique I'm aware of in JAXB to do this is by writing a custom <a href="http://java.sun.com/javase/6/docs/api/javax/xml/bind/annotation/adapters/XmlAdapter.html" rel="nofollow noreferrer"><code>XmlAdapter</code></a> which collapses your empty strings to nulls.

The downside is that you'd have to add this as an annotation to every single element in your code, and if you have 350 of them, that's going to be tedious.

blocks|key|3369503|text|好的，临时介入。使用jaxb的简单工作解决方案(至少对于jdk+1.6.x)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3369504|设置不需要的属性或元素为空！例如...setEmployment(null)；那么整个雇佣结构就消失了。|3369505|干杯玛西|3369506|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

Ok, accasionally stepped in here.
Simple working solution with jaxb (at least for jdk 1.6.x):

set the unwanted Attribute or Element null!
e.g. ...setEmployment(null);
then the whole Employment structure is gone.

Cheers
Masi

blocks|key|1961315|text|+public+static+void+main(String[]+args)+{

++++final+String+regex1+=+"<([a-zA-Z][a-zA-Z0-9]*)[%5E>]*/>";
++++final+String+regex2+=+"<([a-zA-Z][a-zA-Z0-9]*)[%5E>]*>\\s*</\\1>";

++++String+xmlString+=+"<SSN>111111111</SSN><Employment><Current><Address><line1/><line2/><line3/><city/><state/><country/></Address><Phone><phonenumber/><countryCode/></Phone></Current><Previous><Address><line1/><line2/><line3/><city/><state/><country/>++++</Address><Phone><phonenumber/><countryCode/></Phone></Previous></Employment><MaritalStatus>Single</MaritalStatus>";
++++System.out.println(xmlString);

++++final+Pattern+pattern1+=+Pattern.compile(regex1);
++++final+Pattern+pattern2+=+Pattern.compile(regex2);

++++Matcher+matcher1;
++++Matcher+matcher2;
++++do+{
++++++++matcher1+=+pattern1.matcher(xmlString);
++++++++matcher2+=+pattern2.matcher(xmlString);
++++++++xmlString+=+xmlString.replaceAll(regex1,+"").replaceAll(regex2,+"");
++++}+while+(matcher1.find()+%7C%7C+matcher2.find());

++++System.out.println(xmlString);
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1961316|控制台：|unstyled|1961317|<SSN>111111111</SSN>
<Employment>
++++<Current>
++++++++<Address>
++++++++++++<line1/>
++++++++++++<line2/>
++++++++++++<line3/>
++++++++++++<city/>
++++++++++++<state/>
++++++++++++<country/>
++++++++</Address>
++++++++<Phone>
++++++++++++<phonenumber/>
++++++++++++<countryCode/>
++++++++</Phone>
++++</Current>
++++<Previous>
++++++++<Address>
++++++++++++<line1/>
++++++++++++<line2/>
++++++++++++<line3/>
++++++++++++<city/>
++++++++++++<state/>
++++++++++++<country/>
++++++++</Address>
++++++++<Phone>
++++++++++++<phonenumber/>
++++++++++++<countryCode/>
++++++++</Phone>
++++</Previous>
</Employment>
<MaritalStatus>Single</MaritalStatus>

<SSN>111111111</SSN>
<MaritalStatus>Single</MaritalStatus>|1961318|Online+demo+here|offset|length|1961319|entityMap|0|LINK|mutability|MUTABLE|url|http://tpcg.io/6b81Tj^0|0|0|0|0|G|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|V|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$B|C]]|$1|I|3|J|5|F|7|X|8|@]|9|@$K|Y|L|Z|1|10]]|A|$]]|$1|M|3|-4|5|F|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

<pre><code> public static void main(String[] args) {

 final String regex1 = "&lt;([a-zA-Z][a-zA-Z0-9]*)[^&gt;]*/&gt;";
 final String regex2 = "&lt;([a-zA-Z][a-zA-Z0-9]*)[^&gt;]*&gt;\\s*&lt;/\\1&gt;";

 String xmlString = "&lt;SSN&gt;111111111&lt;/SSN&gt;&lt;Employment&gt;&lt;Current&gt;&lt;Address&gt;&lt;line1/&gt;&lt;line2/&gt;&lt;line3/&gt;&lt;city/&gt;&lt;state/&gt;&lt;country/&gt;&lt;/Address&gt;&lt;Phone&gt;&lt;phonenumber/&gt;&lt;countryCode/&gt;&lt;/Phone&gt;&lt;/Current&gt;&lt;Previous&gt;&lt;Address&gt;&lt;line1/&gt;&lt;line2/&gt;&lt;line3/&gt;&lt;city/&gt;&lt;state/&gt;&lt;country/&gt; &lt;/Address&gt;&lt;Phone&gt;&lt;phonenumber/&gt;&lt;countryCode/&gt;&lt;/Phone&gt;&lt;/Previous&gt;&lt;/Employment&gt;&lt;MaritalStatus&gt;Single&lt;/MaritalStatus&gt;";
 System.out.println(xmlString);

 final Pattern pattern1 = Pattern.compile(regex1);
 final Pattern pattern2 = Pattern.compile(regex2);

 Matcher matcher1;
 Matcher matcher2;
 do {
 matcher1 = pattern1.matcher(xmlString);
 matcher2 = pattern2.matcher(xmlString);
 xmlString = xmlString.replaceAll(regex1, "").replaceAll(regex2, "");
 } while (matcher1.find() || matcher2.find());

 System.out.println(xmlString);
}
</code></pre>

Console:

<pre><code>&lt;SSN&gt;111111111&lt;/SSN&gt;
&lt;Employment&gt;
 &lt;Current&gt;
 &lt;Address&gt;
 &lt;line1/&gt;
 &lt;line2/&gt;
 &lt;line3/&gt;
 &lt;city/&gt;
 &lt;state/&gt;
 &lt;country/&gt;
 &lt;/Address&gt;
 &lt;Phone&gt;
 &lt;phonenumber/&gt;
 &lt;countryCode/&gt;
 &lt;/Phone&gt;
 &lt;/Current&gt;
 &lt;Previous&gt;
 &lt;Address&gt;
 &lt;line1/&gt;
 &lt;line2/&gt;
 &lt;line3/&gt;
 &lt;city/&gt;
 &lt;state/&gt;
 &lt;country/&gt;
 &lt;/Address&gt;
 &lt;Phone&gt;
 &lt;phonenumber/&gt;
 &lt;countryCode/&gt;
 &lt;/Phone&gt;
 &lt;/Previous&gt;
&lt;/Employment&gt;
&lt;MaritalStatus&gt;Single&lt;/MaritalStatus&gt;

&lt;SSN&gt;111111111&lt;/SSN&gt;
&lt;MaritalStatus&gt;Single&lt;/MaritalStatus&gt;
</code></pre>

<a href="http://tpcg.io/6b81Tj" rel="nofollow noreferrer">Online demo here</a>

My java module gets a huge input xml from a mainframe. Unfortunately, the mainframe is unable to skip optional elements, with the result that I get a LOT of empty tags in my input :

So,

<pre><code>&lt;SSN&gt;111111111&lt;/SSN&gt;
&lt;Employment&gt;
&lt;Current&gt;
&lt;Address&gt;
&lt;line1/&gt;
&lt;line2/&gt;
&lt;line3/&gt;
&lt;city/&gt;
&lt;state/&gt;
&lt;country/&gt;
&lt;/Address&gt;
&lt;Phone&gt;
&lt;phonenumber/&gt;
&lt;countryCode/&gt;
&lt;/Phone&gt;
&lt;/Current&gt;
&lt;Previous&gt;
&lt;Address&gt;
&lt;line1/&gt;
&lt;line2/&gt;
&lt;line3/&gt;
&lt;city/&gt;
&lt;state/&gt;
&lt;country/&gt; 
&lt;/Address&gt;
&lt;Phone&gt;
&lt;phonenumber/&gt;
&lt;countryCode/&gt;
&lt;/Phone&gt;
&lt;/Previous&gt;
&lt;/Employment&gt;
&lt;MaritalStatus&gt;Single&lt;/MaritalStatus&gt;
</code></pre>

should be:

<pre><code>&lt;SSN&gt;111111111&lt;/SSN&gt;
&lt;MaritalStatus&gt;SINGLE&lt;/MaritalStatus&gt;
</code></pre>

I use jaxb to unmarshall the input xml string that the mainframe sends it. Is there a clean/ easy way to remove all the empty group tags, or do I have to do this manuall in the code for each element. I have over 350 elements in my input xml, so I would love to it if jaxb itself had a way of doing this automatically?

Thanks,
SGB

how to remove empty tags in input xml

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我的java模块从大型机获取大量的xml输入。不幸的是，大型机不能跳过可选元素，结果是我的输入中有很多空标签：所以,<SSN>111111111</SSN><Employment><Current><Address><line1/><line2/><line3/><city/><state/><country/></A...

问如何删除输入xml中的空标签
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问如何删除输入xml中的空标签EN