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测试工具jmeter可用来进行性能测试

 Returns:
 - the property value, but if not found:
 - the default value, but if not defined:
 - the property name itself</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../org/apache/jmeter/functions/Property2.html" title="class in org.apache.jmeter.functions">Property2</A></B></TD>
<TD>Function to get a JMeter property, or a default. </TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../org/apache/jmeter/functions/Random.html" title="class in org.apache.jmeter.functions">Random</A></B></TD>
<TD>Provides a Random function which returns a random long integer between a min
 (first argument) and a max (second argument).</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../org/apache/jmeter/functions/RegexFunction.html" title="class in org.apache.jmeter.functions">RegexFunction</A></B></TD>
<TD>Implements regular expression parsing of sample results and variables</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../org/apache/jmeter/functions/SetProperty.html" title="class in org.apache.jmeter.functions">SetProperty</A></B></TD>
<TD>Function to set a JMeter property
 
 Parameters: - property name - value
 
 Usage:
 
 Set the property value in the appropriate GUI by using the string:
 ${__setProperty(propname,propvalue[,returnvalue?])}
 
 </TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../org/apache/jmeter/functions/SplitFunction.html" title="class in org.apache.jmeter.functions">SplitFunction</A></B></TD>
<TD>Function to split a string into variables
 
 Parameters:
 
 String to split
 Variable name prefix
 String to split on (optional, default is comma)
 
 
 
 Returns: the input string
 
 Also sets the variables:
 
 VARNAME - the input string
 VARNAME_n - number of fields found
 VARNAME_1..n - fields
 </TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../org/apache/jmeter/functions/StringFromFile.html" title="class in org.apache.jmeter.functions">StringFromFile</A></B></TD>
<TD>StringFromFile Function to read a String from a text file.
 
 </TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../org/apache/jmeter/functions/ThreadNumber.html" title="class in org.apache.jmeter.functions">ThreadNumber</A></B></TD>
<TD>Function to return the current thread number.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../org/apache/jmeter/functions/TimeFunction.html" title="class in org.apache.jmeter.functions">TimeFunction</A></B></TD>
<TD>__time() function - returns the current time in milliseconds</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../org/apache/jmeter/functions/Variable.html" title="class in org.apache.jmeter.functions">Variable</A></B></TD>
<TD>Function to get a JMeter Variable
 
 Parameters: 
 - variable name
 
 Returns: 
 - the variable value, but if not found 
 - the variable name itself</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../org/apache/jmeter/functions/XPath.html" title="class in org.apache.jmeter.functions">XPath</A></B></TD>
<TD>The function represented by this class allows data to be read from XML files.
 </TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../org/apache/jmeter/functions/XPathFileContainer.html" title="class in org.apache.jmeter.functions">XPathFileContainer</A></B></TD>
<TD>File data container for XML files Data is accessible via XPath</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../org/apache/jmeter/functions/XPathWrapper.html" title="class in org.apache.jmeter.functions">XPathWrapper</A></B></TD>
<TD>This class wraps the XPathFileContainer for use across multiple threads.
 
 </TD>
</TR>
</TABLE>
&nbsp;

<P>

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<TD COLSPAN=2><FONT SIZE="+2">
<B>Exception Summary</B></FONT></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../org/apache/jmeter/functions/InvalidVariableException.html" title="class in org.apache.jmeter.functions">InvalidVariableException</A></B></TD>
<TD>&nbsp;</TD>
</TR>
</TABLE>
&nbsp;

<P>
<A NAME="package_description"><!-- --></A><H2>
Package org.apache.jmeter.functions Description
</H2>

<P>
<h1>Functions</h1>
	<h2>Methods to be implemented</h2>
	setParameters(Collection)
	
		<br></br>
	execute(prevResult,currentSampler)
	Note that either or both of the parameters may be null.
	
	<h2>Calling sequence</h2>
	When the test plan is prepared for running, one instance of the class is created for each occurrence
	of a function call.	The setParameters() method is then called on each instance.
	Once the test is running, the execute method can be called by any thread, and is
	therefore synchronized.
	
	This is unlike most of (all?) the JMeter test elements, which are created for each thread.
	
	Any context that needs to be maintained for a thread must be done using ThreadLocal or similar.
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