在jetty7的etc目录下的jetty-webs.xml中加上如下即可:
<Configure id="Server" class="org.eclipse.jetty.server.Server">
<Call name="setAttribute">
<Arg>org.eclipse.jetty.server.Request.maxFormContentSize</Arg>
<Arg>5000000</Arg>
</Call>
<Ref id="DeploymentManager">
<Call id="webappprovider" name="addAppProvider">
<Arg>
<New class="org.eclipse.jetty.deploy.providers.WebAppProvider">
<Set name="monitoredDirName"><Property name="jetty.home" default="." />/webapps</Set>
<Set name="defaultsDescriptor"><Property name="jetty.home" default="."/>/etc/webdefault.xml</Set>
<Set name="scanInterval">1</Set>
<Set name="contextXmlDir"><Property name="jetty.home" default="." />/contexts</Set>
<Set name="extractWars">true</Set>
</New>
</Arg>
</Call>
</Ref>
</Configure>