日期:2014-05-19  浏览次数:20644 次

第一个servlet各种碰壁,新手求指教
我直接把代码贴出来吧
这个是前台网页
  <body bgcolor = "cccfff">
  <FORM method = "post" action = "aa">
  <P>数据1<INPUT type = "text" name = "gr1"></P>
  <P>数据1<INPUT type = "text" name = "gr2"></P>
  <P>数据1<INPUT type = "text" name = "gr3"></P>
  <P><INPUT type = "submit" value = "提交">
  <INPUT type = "reset" value = "清除">
  </P>
  </FORM>
   
  </body>

这个是servlet程序


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 aa extends HttpServlet {
protected void processRequest(HttpServletRequest request , HttpServletResponse response)throws ServletException , IOException{
response.setContentType("text/html ; charset = UTF-8");
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head>");
out.println("<title>getParams</title>");
out.println("</head>");
out.println("<body>");
out.println(request.getParameter("gr1") + "<br>");
out.println(request.getParameter("gr2") + "<br>");
out.println(request.getParameter("gr3") + "<br>");
out.println("<html>");
out.println("<html>");
out.println("</body>");
out.println("</html>");
}

protected void doGet(HttpServletRequest request , HttpServletResponse response)throws ServletException , IOException{
processRequest(request,response);
}
protected void doPost(HttpServletRequest request , HttpServletResponse response)throws ServletException , IOException{
processRequest(request,response);
}
}


这个是web.xml的配置文件
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" 
xmlns="http://java.sun.com/xml/ns/j2ee" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

   
  
  <servlet>
   
  <servlet-name>aa</servlet-name>
  <servlet-class>aa</servlet-class>
  </servlet>


  <servlet-mapping>
  <servlet-name>aa</servlet-name>
  <url-pattern>/aa</url-pattern>
  </servlet-mapping>


</web-app>



问题是这样的 我点击 提交 按钮 理论上应该是跳到servlet显示出各个文本框的内容 不过我点击 提交 出现的却是下载页面 点击下载 然后aa就被下载下来了

------解决方案--------------------
果断换一个试试看?
------解决方案--------------------
你这个问题 我已经出现多次了。 是你编码方式写错了 

response.setContentType("text/html ;