求助！错误HTTP Status 500（doPost调用doGet中的参数） - Java web开发及框架技术 - ITPUB论坛

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发表于 2008-6-11 22:55

求助！错误HTTP Status 500（doPost调用doGet中的参数）

今天tomcat出现问题了，XP+myEclipse5.5+tomcat

代码如下,

package com.apple.webP2;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class LoginFormServlet extends HttpServlet {
private static final long serialVersionUID = 1L;

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">");

out.println("<HTML>");
out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println("  <BODY>");

out.println("<form method="post" action="/webP2/servlet/LoginForm">");

out.println("<input type='text' name='username' size='18'><br>");
out.println("<input type='password' name='password' size='18'><br>");
      out.println("<input type='submit' value='submit' name='submit'>");
      out.println("<input type='reset' value='reset' name='reset'><br>");
out.println("</form>");

      out.println("  </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

response.setContentType("text/html;charset='utf-8'");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">");
out.println("<HTML>");
out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println("  <BODY>");

out.println("my name:"+request.getParameter("username")+"<br>");
out.println("my password:"+request.getParameter("password")+"<br>");

out.println("  </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}

}

doGet方法正常，填入简单表格信息，提交后，出现如下内容：
HTTP Status 500 -

--------------------------------------------------------------------------------

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

java.io.UnsupportedEncodingException: 'utf-8'
sun.io.Converters.getConverterClass(Unknown Source)
sun.io.Converters.newConverter(Unknown Source)
sun.io.CharToByteConverter.getConverter(Unknown Source)
sun.nio.cs.StreamEncoder$ConverterSE.<init>(Unknown Source)
sun.nio.cs.StreamEncoder$ConverterSE.<init>(Unknown Source)
sun.nio.cs.StreamEncoder.forOutputStreamWriter(Unknown Source)
java.io.OutputStreamWriter.<init>(Unknown Source)
org.apache.tomcat.util.buf.WriteConvertor.<init>(C2BConverter.java:174)
org.apache.tomcat.util.buf.C2BConverter.<init>(C2BConverter.java:47)
org.apache.catalina.connector.OutputBuffer.setConverter(OutputBuffer.java:520)
org.apache.catalina.connector.OutputBuffer.checkConverter(OutputBuffer.java:486)
org.apache.catalina.connector.Response.getWriter(Response.java:630)
org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:198)
com.apple.webP2.LoginFormServlet.doPost(LoginFormServlet.java:43)
javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

我的URL路径输入都是OK的。

（我然后用了以前的例子，是设定init-param的，servlet简单程序，居然出现HTTP-404，昨天还运行好好的，怎么搞的？）

我的路径什么的都统统没改过，难道是中毒了？。。。。
望能帮着解答，不胜感激！

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