如果你的ColdFusion applications运行在一个多人使用的服务器上，要考虑文件的安全性，文件可能被别人使用的cffile更新或操纵。更多信息，请看Configuring and Administering ColdFusion。

语法

这个标签的语法根据动作属性值。请看以下章节。

范例

<!--- This shows how to write, read, update, and delete a file using CFFILE.
This is a view-only example. --->
<!--- 
<cfif IsDefined("form.formsubmit") is "Yes"> 
    <!--- The form has been submitted, now do the action. ---> 
    <cfif form.action is "new"> 
        <!--- Make a new file. ---> 
        <cffile action="Write" 
            file="#GetTempDirectory()#foobar.txt" 
            output="#form.the_text#"> 
    </cfif> 
    <cfif form.action is "read"> 
        <!--- Read existing file. ---> 
        <cffile action="Read" 
            file="#GetTempDirectory()#foobar.txt" 
            variable="readText"> 
    </cfif> 

    <cfif form.action is "add"> 
        <!--- Update existing file. ---> 
        <cffile action="Append" 
            file="#GetTempDirectory()#foobar.txt" 
            output="#form.the_text#"> 
    </cfif> 

    <cfif form.action is "delete"> 
        <!--- Delete existing fil. ---> 
        <cffile action="Delete" 
            file="#GetTempDirectory()#foobar.txt"> 
    </cfif> 
</cfif> 
<!--- Set some variables. ---> 
<cfparam     name="fileExists"     default="no"> 
<cfparam name="readText" default=""> 
<!--- First, check whether canned file exists. ---> 
<cfif FileExists("#GetTempDirectory()#foobar.txt") is "Yes"> 
    <cfset fileExists="yes"> 
</cfif> 
<!--- Now, make the form that runs the example. ---> 
<form action="index.cfm" method="POST"> 
<h4>Type in some text to include in your file:</h4> <p> 
<cfif fileExists is "yes"> 
    <p>A file exists (foobar.txt, in <cfoutput>#GetTempDirectory()#</cfoutput>). 
    You may add to it, read from it, or delete it. </p>
</cfif> 
<!--- If reading from a form, let that information display in textarea. ---> 
<textarea name="the_text" cols="40" rows="5"> 
    <cfif readText is not ""> 
        <cfoutput>#readText#</cfoutput> 
    </cfif></textarea> 
<!--- Select from the actions depending on whether the file exists. ---> 
<select name="action"> 
<cfif fileExists is "no"> 
    <option value="new">Make new file 
</cfif> 
<cfif fileExists is "yes"> 
    <option value="add">Add to existing file 
    <option value="delete">Delete file 
    <option value="read">Read existing file 
</cfif> 
</select> 
<input type="Hidden" name="formsubmit" value="yes"> 
<input type="Submit" name="" value="make my changes"> 
</form> --->