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📁 JspServlet教程专栏对javaservlet讲述的非常详细
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<p align="center"><big><strong>如何在jsp中读取远程机器的Properties 文件和ip地址</strong></big></p>
<div align="right">---摘自互联网</div>

<br>This&nbsp; servlet&nbsp; could&nbsp; be&nbsp; used&nbsp; for&nbsp; basic&nbsp; security&nbsp; in&nbsp; servlet.<br>
When&nbsp; you&nbsp; want&nbsp; to&nbsp; limit&nbsp; the&nbsp; computers&nbsp; that&nbsp; can&nbsp; call&nbsp; a&nbsp; specific&nbsp; servlet.<br>
You&nbsp; read&nbsp; the&nbsp; valid&nbsp; IP&nbsp; address&nbsp; from&nbsp; a&nbsp; properties&nbsp; file.<br>
The&nbsp; IP&nbsp; of&nbsp; the&nbsp; computer&nbsp; calling&nbsp; the&nbsp; servlet&nbsp; (static&nbsp; IP)&nbsp; is&nbsp; compared&nbsp; with&nbsp; value&nbsp; in&nbsp; the&nbsp; property&nbsp; file.<br>
<br>
If&nbsp; the&nbsp; values&nbsp; are&nbsp; the&nbsp; same&nbsp; then&nbsp; it&nbsp; is&nbsp; called&nbsp; from&nbsp; the&nbsp; correct&nbsp; computer.<br>
Otherwise&nbsp; a&nbsp; message&nbsp; is&nbsp; displayed&nbsp; showing&nbsp; the&nbsp; error.<br>
<br>
For&nbsp; demonstration&nbsp; purposes&nbsp; the&nbsp; IP&nbsp; Addresses&nbsp; are&nbsp; displayed.<br>
<br>
Save&nbsp; the&nbsp; file&nbsp; as&nbsp; GetIPAddressServlet.java<br>
<br>
Create&nbsp; text&nbsp; file&nbsp; called&nbsp; readip.props<br>
Inside&nbsp; the&nbsp; file&nbsp; type:<br>
ip=xxx.xxx.xx.xx<br>
replace&nbsp; the&nbsp; 'x'&nbsp; with&nbsp; the&nbsp; actual&nbsp; IP&nbsp; address&nbsp; you&nbsp; want&nbsp; to&nbsp; store.&nbsp; This&nbsp; will&nbsp; be&nbsp; used&nbsp; to&nbsp; compare&nbsp; with&nbsp; the&nbsp; IP&nbsp; address&nbsp; of&nbsp; the&nbsp; computer&nbsp; calling&nbsp; the&nbsp; servlet.<br>
<br>
Copy&nbsp; the&nbsp; readip.props&nbsp; file&nbsp; into&nbsp; a&nbsp; directory&nbsp; which&nbsp; the&nbsp; servlet&nbsp; will&nbsp; be&nbsp; able&nbsp; to&nbsp; find.&nbsp; For&nbsp; example,&nbsp; c:\winnt\system32<br>
<br>
Compile&nbsp; the&nbsp; servlet.<br>
javac&nbsp; GetIPAddressServlet.java<br>
<br>
Copy&nbsp; the&nbsp; servlet&nbsp; class&nbsp; file&nbsp; into&nbsp; the&nbsp; servlet&nbsp; directory&nbsp; on&nbsp; the&nbsp; webserver&nbsp; (read&nbsp; vendor's&nbsp; documentation).<br>
<br>
Call&nbsp; the&nbsp; servlet&nbsp; http://localhost/GetIPAddressServlet<br>
and&nbsp; it&nbsp; should&nbsp; display&nbsp; the&nbsp; IP&nbsp; addresses&nbsp; and&nbsp; the&nbsp; results&nbsp; of&nbsp; the&nbsp; comparison.<br>
<br>
<br>
import&nbsp; java.io.*;<br>
import&nbsp; java.lang.*;<br>
import&nbsp; java.util.*;<br>
import&nbsp; javax.servlet.*;<br>
import&nbsp; javax.servlet.http.*;<br>
<br>
<br>
public&nbsp; class&nbsp; GetIPAddressServlet&nbsp; extends&nbsp; HttpServlet<br>
{<br>
protected&nbsp; void&nbsp; doGet(HttpServletRequest&nbsp; request,<br>
HttpServletResponse&nbsp; response)<br>
throws&nbsp; ServletException,&nbsp; IOException<br>
{<br>
<br>
response.setContentType("text/html");<br>
ServletOutputStream&nbsp; out&nbsp; =&nbsp; response.getOutputStream();<br>
out.println("&lt;HTML>&lt;HEAD>&lt;TITLE>");<br>
out.println("Get&nbsp; IP&nbsp; Address&nbsp; Servlet");<br>
out.println("&lt;/TITLE>&lt;/HEAD>");<br>
out.println("&lt;BODY>");<br>
<br>
//&nbsp; Read&nbsp; properties&nbsp; file.<br>
Properties&nbsp; properties&nbsp; =&nbsp; new&nbsp; Properties();<br>
try<br>
{<br>
properties.load(new&nbsp; FileInputStream("readip.props"));<br>
}<br>
catch(IOException&nbsp; e)<br>
{<br>
e.printStackTrace();<br>
}<br>
String&nbsp; ipAddress&nbsp; =&nbsp; "";<br>
String&nbsp; remoteIPAddress&nbsp; =&nbsp; "";<br>
//&nbsp; Read&nbsp; the&nbsp; value&nbsp; of&nbsp; key&nbsp; -&nbsp; ip<br>
ipAddress&nbsp; =&nbsp; properties.getProperty("ip");<br>
<br>
out.println("ip&nbsp; address&nbsp; (from&nbsp; properties&nbsp; file)&nbsp; ="&nbsp; +&nbsp; ipAddress);<br>
out.println("&lt;br>");<br>
//&nbsp; read&nbsp; the&nbsp; (remote)&nbsp; IP&nbsp; address&nbsp; of&nbsp; the&nbsp; requesting&nbsp; computer<br>
remoteIPAddress&nbsp; =&nbsp; request.getRemoteAddr();<br>
request.<br>
out.println("remote&nbsp; ip&nbsp; address&nbsp; ="&nbsp; +&nbsp; remoteIPAddress);<br>
out.println("&lt;br>");<br>
<br>
if&nbsp; (ipAddress.equals(remoteIPAddress))<br>
{<br>
out.println("Same&nbsp; IP&nbsp; Address");<br>
}<br>
else<br>
{<br>
out.println("Sorry,&nbsp; this&nbsp; is&nbsp; not&nbsp; the&nbsp; same&nbsp; IP&nbsp; Address");<br>
}<br>
<br>
out.println("&lt;/BODY>&lt;/HTML>");<br>
out.close();<br>
<br>
}<br>
}

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