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Java Tutorial/Servlet/Error Page - История изменений
2026-04-10T20:49:44Z
История изменений этой страницы в вики
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http://jexp.ru/index.php?title=Java_Tutorial/Servlet/Error_Page&diff=4944&oldid=prev
Admin: 1 версия
2010-06-01T05:07:04Z
<p>1 версия</p>
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<td colspan="1" style="background-color: white; color:black; text-align: center;">← Предыдущая</td>
<td colspan="1" style="background-color: white; color:black; text-align: center;">Версия 05:07, 1 июня 2010</td>
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Admin
http://jexp.ru/index.php?title=Java_Tutorial/Servlet/Error_Page&diff=4943&oldid=prev
в 17:44, 31 мая 2010
2010-05-31T17:44:27Z
<p></p>
<p><b>Новая страница</b></p><div>== Servlet Error Display ==<br />
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<!-- start source code --><br />
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<source lang="java"><br />
import java.io.*;<br />
import javax.servlet.*;<br />
import javax.servlet.http.*;<br />
import java.util.*;<br />
public class MyServlet extends HttpServlet {<br />
public void doGet(HttpServletRequest req, HttpServletResponse res) <br />
throws ServletException, IOException {<br />
res.setContentType("text/html");<br />
PrintWriter out = res.getWriter();<br />
String code = null, message = null, type = null;<br />
Object codeObj, messageObj, typeObj;<br />
codeObj = req.getAttribute("javax.servlet.error.status_code");<br />
messageObj = req.getAttribute("javax.servlet.error.message");<br />
typeObj = req.getAttribute("javax.servlet.error.exception_type");<br />
if (codeObj != null) code = codeObj.toString();<br />
if (messageObj != null) message = messageObj.toString();<br />
if (typeObj != null) type = typeObj.toString();<br />
String reason = (code != null ? code : type);<br />
out.println("<HTML>");<br />
out.println("<HEAD><TITLE>" + reason + ": " + message + "</TITLE></HEAD>");<br />
out.println("<BODY>");<br />
out.println("<H1>" + reason + "</H1>");<br />
out.println("<H2>" + message + "</H2>");<br />
out.println("<HR>");<br />
out.println("<I>Error accessing " + req.getRequestURI() + "</I>");<br />
out.println("</BODY></HTML>");<br />
}<br />
}</source><br />
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<!-- end source code --><br />
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== Servlet Error Page ==<br />
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<!-- start source code --><br />
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<source lang="java"><br />
import java.io.*;<br />
import javax.servlet.*;<br />
import javax.servlet.http.*;<br />
public class MyServlet extends HttpServlet {<br />
public void doGet(HttpServletRequest req, HttpServletResponse res)<br />
throws ServletException, IOException {<br />
res.setContentType("text/html");<br />
PrintWriter out = res.getWriter();<br />
String code = null, message = null, type = null, uri = null;<br />
Object codeObj, messageObj, typeObj;<br />
Throwable throwable;<br />
// Retrieve the three possible error attributes, some may be null<br />
codeObj = req.getAttribute("javax.servlet.error.status_code");<br />
messageObj = req.getAttribute("javax.servlet.error.message");<br />
typeObj = req.getAttribute("javax.servlet.error.exception_type");<br />
throwable = (Throwable)<br />
req.getAttribute("javax.servlet.error.exception");<br />
uri = (String) <br />
req.getAttribute("javax.servlet.error.request_uri");<br />
if (uri == null) {<br />
uri = req.getRequestURI(); // in case there"s no URI given<br />
}<br />
// Convert the attributes to string values<br />
if (codeObj != null) code = codeObj.toString();<br />
if (messageObj != null) message = messageObj.toString();<br />
if (typeObj != null) type = typeObj.toString();<br />
// The error reason is either the status code or exception type<br />
String reason = (code != null ? code : type);<br />
out.println("<HTML>");<br />
out.println("<HEAD><TITLE>" + reason + ": " + message +<br />
"</TITLE></HEAD>");<br />
out.println("<BODY>");<br />
out.println("<H1>" + reason + "</H1>");<br />
out.println("<H2>" + message + "</H2>");<br />
out.println("<PRE>");<br />
if (throwable != null) {<br />
throwable.printStackTrace(out);<br />
}<br />
out.println("</PRE>");<br />
out.println("<HR>");<br />
out.println("<I>Error accessing " + uri + "</I>");<br />
out.println("</BODY></HTML>");<br />
}<br />
}</source><br />
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<!-- end source code --></div>