blocks|key|1499500|text|有一个trimWhiteSpaces指令可以做到这一点，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1499501|在您的JSP中：|1499502|<%25@+page+trimDirectiveWhitespaces="true"+%25>|code-block|syntax|javascript|1499503|或者在jsp-config部分中您的web.xml+(请注意，这是从servlet规范2.5开始工作的)：|1499504|<jsp-config>
++<jsp-property-group>
++++<url-pattern>*.jsp</url-pattern>
++++<trim-directive-whitespaces>true</trim-directive-whitespaces>
++</jsp-property-group>
</jsp-config>|1499505|不幸的是，如果你有一个必要的空间，它可能也需要剥离，所以你可能需要一个不间断的空间在某些位置。|1499506|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

There is a trimWhiteSpaces directive that should accomplish this,

In your JSP:

<pre><code>&lt;%@ page trimDirectiveWhitespaces="true" %&gt;
</code></pre>

Or in the jsp-config section your web.xml (Note that this works starting from servlet specification 2.5.):

<pre><code>&lt;jsp-config&gt;
 &lt;jsp-property-group&gt;
 &lt;url-pattern&gt;*.jsp&lt;/url-pattern&gt;
 &lt;trim-directive-whitespaces&gt;true&lt;/trim-directive-whitespaces&gt;
 &lt;/jsp-property-group&gt;
&lt;/jsp-config&gt;
</code></pre>

Unfortunately if you have a required space it might also need strip that, so you may need a non-breaking space in some locations.

blocks|key|1499555|text|trimDirectiveWhitespaces只被支持JSP2.1及更高版本的servlet容器支持，或者在这种情况下是Tomcat6(以及一些版本，例如Tomcat6.0.10没有正确实现它--不知道其他版本)。这里有更多关于trimDirectiveWhitespaces的信息：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1499556|http://www.oracle.com/technetwork/articles/javaee/jsp-21-136414.html|offset|length|1499557|还有这里|1499558|http://raibledesigns.com/rd/entry/trim_spaces_in_your_jsp1|1499559|entityMap|0|LINK|mutability|MUTABLE|url|1^0|0|0|1W|0|0|0|0|1M|1|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@$D|T|E|U|1|V]]|A|$]]|$1|F|3|G|5|6|7|W|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|X|8|@]|9|@$D|Y|E|Z|1|10]]|A|$]]|$1|J|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|C]]|Q|$5|M|N|O|A|$P|I]]]]

The trimDirectiveWhitespaces is only supported by servlet containers that support JSP 2.1 and after, or in the case or Tomcat, Tomcat 6 (and some versions e.g. Tomcat 6.0.10 don't implement it properly - don't know about the others).
There's more information about trimDirectiveWhitespaces here: 

<a href="http://www.oracle.com/technetwork/articles/javaee/jsp-21-136414.html" rel="nofollow noreferrer">http://www.oracle.com/technetwork/articles/javaee/jsp-21-136414.html</a>

and here

<a href="http://raibledesigns.com/rd/entry/trim_spaces_in_your_jsp1" rel="nofollow noreferrer">http://raibledesigns.com/rd/entry/trim_spaces_in_your_jsp1</a>

blocks|key|1714828|text|如果你使用的是标签，你也可以在那里应用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1714829|<%25@+tag+description="My+Tag"+trimDirectiveWhitespaces="true"+%25>|code-block|syntax|javascript|1714830|在你的jsp上：|1714831|<%25@+page+trimDirectiveWhitespaces="true"+%25>|1714832|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

If you're using tags, you can apply there too:

<pre><code>&lt;%@ tag description="My Tag" trimDirectiveWhitespaces="true" %&gt;
</code></pre>

And on your jsp:

<pre><code>&lt;%@ page trimDirectiveWhitespaces="true" %&gt;
</code></pre>

blocks|key|1714645|text|不是直接满足您的要求，但对我有帮助的是在jsp标记周围巧妙地放置HTML标记，并在servlet标记内放置空格(<%25+%25>)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1714646|${""}<%25

%25><input+type="radio"+id="input1"+name="dayChooser"+value="Tuesday"/><%25
%25><label+for="input1"+class="${extraClass}">Tuesday</label>|code-block|syntax|javascript|1714647|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Not directly what you're asking for, but what helps me is putting HTML comment tags in a clever way around my jsp tags, and also putting whitespace inside a servlet tag (&lt;% %>):

<pre><code>${"&lt;!--"}
&lt;c:if test="${first}"&gt;
 &lt;c:set var="extraClass" value="${extraClass} firstRadio"/&gt;
&lt;/c:if&gt;
&lt;c:set var="first" value="${false}"/&gt;
${"--&gt;"}&lt;%

%&gt;&lt;input type="radio" id="input1" name="dayChooser" value="Tuesday"/&gt;&lt;%
%&gt;&lt;label for="input1" class="${extraClass}"&gt;Tuesday&lt;/label&gt;
</code></pre>

blocks|key|1499710|text|您可以更进一步，还可以在构建时删除html标记之间的换行符(回车符)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1499711|例如，更改：|1499712|Hello
How+are+you?|code-block|syntax|javascript|1499713|进入：|1499714|HelloHow+are+you?|1499715|请执行此操作，使用maven-replacer-plugin并在pom.xml中设置它|offset|length|style|CODE|1499716|<plugin>
++++<groupId>com.google.code.maven-replacer-plugin</groupId>
++++<artifactId>replacer</artifactId>
++++<version>1.5.3</version>
++++<executions>
++++++++<execution>
++++++++++++<id>stripNewlines</id>
++++++++++++<phase>prepare-package</phase>
++++++++++++<goals>
++++++++++++++++<goal>replace</goal>
++++++++++++</goals>
++++++++++++<configuration>
++++++++++++++++<basedir>${project.build.directory}</basedir>
++++++++++++++++<filesToInclude>projectname/WEB-INF/jsp/**/*.jsp</filesToInclude>
++++++++++++++++<token>&gt;\s*&lt;</token>
++++++++++++++++<value>&gt;&lt;</value>
++++++++++++++++<regexFlags>
++++++++++++++++++++<regexFlag>MULTILINE</regexFlag>
++++++++++++++++</regexFlags>
++++++++++++</configuration>
++++++++</execution>
++++</executions>
</plugin>|1499717|这只会修改build-directory中的JSP，而不会触及源代码中的JSP。|1499718|您可能需要调整JSP所在的路径(<filesToInclude>)。|1499719|entityMap^0|0|0|0|0|0|9|L|W|7|0|0|0|G|G|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|12|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|13|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|14|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|15|8|@$O|16|P|17|Q|R]|$O|18|P|19|Q|R]]|9|@]|A|$]]|$1|S|3|T|5|F|7|1A|8|@]|9|@]|A|$G|H]]|$1|U|3|V|5|6|7|1B|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|1C|8|@$O|1D|P|1E|Q|R]]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1F|8|@]|9|@]|A|$]]]|Z|$]]

You can go one step further and also remove newlines (carriage returns) between the html tags at build time.

E.g. change:

<pre><code>&lt;p&gt;Hello&lt;/p&gt;
&lt;p&gt;How are you?&lt;/p&gt;
</code></pre>

into:

<pre><code>&lt;p&gt;Hello&lt;/p&gt;&lt;p&gt;How are you?&lt;/p&gt;
</code></pre>

Do do that, use the <code>maven-replacer-plugin</code> and set it up in <code>pom.xml</code>:

<pre><code>&lt;plugin&gt;
 &lt;groupId&gt;com.google.code.maven-replacer-plugin&lt;/groupId&gt;
 &lt;artifactId&gt;replacer&lt;/artifactId&gt;
 &lt;version&gt;1.5.3&lt;/version&gt;
 &lt;executions&gt;
 &lt;execution&gt;
 &lt;id&gt;stripNewlines&lt;/id&gt;
 &lt;phase&gt;prepare-package&lt;/phase&gt;
 &lt;goals&gt;
 &lt;goal&gt;replace&lt;/goal&gt;
 &lt;/goals&gt;
 &lt;configuration&gt;
 &lt;basedir&gt;${project.build.directory}&lt;/basedir&gt;
 &lt;filesToInclude&gt;projectname/WEB-INF/jsp/**/*.jsp&lt;/filesToInclude&gt;
 &lt;token&gt;&amp;gt;\s*&amp;lt;&lt;/token&gt;
 &lt;value&gt;&amp;gt;&amp;lt;&lt;/value&gt;
 &lt;regexFlags&gt;
 &lt;regexFlag&gt;MULTILINE&lt;/regexFlag&gt;
 &lt;/regexFlags&gt;
 &lt;/configuration&gt;
 &lt;/execution&gt;
 &lt;/executions&gt;
&lt;/plugin&gt;
</code></pre>

This will only modify the JSPs in the build-directory, and not touch the JSPs in your sources.

You might need to adapt the path (<code>&lt;filesToInclude&gt;</code>) where your JSPs are located in.

blocks|key|1714904|text|请使用trim函数，例如|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1714905|fn:trim(string1)|code-block|syntax|javascript|1714906|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Please, use the trim funcion, example

<pre><code>fn:trim(string1)
</code></pre>

blocks|key|1499641|text|使用以下命令添加/编辑tomcat+catalina.properties文件|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1499642|org.apache.jasper.compiler.Parser.STRICT_QUOTE_ESCAPING=false|code-block|syntax|javascript|1499643|另请参阅：https://confluence.sakaiproject.org/display/BOOT/Install%2BTomcat%2B7|1499644|entityMap|0|LINK|mutability|MUTABLE|url|https://confluence.sakaiproject.org/display/BOOT/Install%2BTomcat%2B7^0|I|J|0|0|5|1T|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|M|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

Add/edit your tomcat <code>catalina.properties</code> file with 

<pre><code>org.apache.jasper.compiler.Parser.STRICT_QUOTE_ESCAPING=false
</code></pre>

See also: <a href="https://confluence.sakaiproject.org/display/BOOT/Install+Tomcat+7" rel="nofollow">https://confluence.sakaiproject.org/display/BOOT/Install+Tomcat+7</a>

blocks|key|1714960|text|如果你想去掉在输出之前所做的任何事情所导致的空行，你可以使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1714961|out.clearBuffer();|code-block|syntax|javascript|1714962|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Just a bit off the actual question, If you want to get rid of the empty lines cause by whatever you did before outputting, you can use

<pre><code>out.clearBuffer();
</code></pre>

How can I strip out extra whitespace from jsp pages' output? Is there a switch I can flip on my web.xml? Is there a Tomcat specific setting?

Strip whitespace from jsp output

容器

如何从jsp页面的输出中去掉多余的空格？我的web.xml上有没有可以翻转的开关？有没有特定于Tomcat的设置？

问从jsp输出中去掉空格
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