/*
作者：何志强[hhzqq@21cn.com]
日期：2000-08-10
版本：1.0
功能：Servlet基础例程 - HelloServlet
*/
import java.io.*;
import java.text.*; //MessageFormat
import javax.servlet.*;
import javax.servlet.http.*;
public class HelloServlet extends HttpServlet{
//页面标题
protected static final String strTitle = "Servlet基础例程 - HelloServlet";
//页眉
protected static final String strHeader =
""+
"
"+""+
"
""+
"
";//页脚
protected static final String strFooter =
""+
"";
//表单
protected static final String strForm =
"
";protected static final String strHello =
"您好，{0}，欢迎来到Servlet/JSP世界！";
//出错信息
protected static final String strError =
"
{0}
";protected void doGet(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException{
process(req,resp);
}
protected void doPost(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException{
process(req,resp);
}
protected void process(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException{
try{
String submit = req.getParameter("submit");
if(submit==null)
printForm(req,resp);
else
printHello(req,resp);
}
catch(Exception e){
printError(e.toString(),req,resp);
}
}
protected void printForm(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException{
//在使用PrintWriter前得先设置Content Type
resp.setContentType("text/html;charset=gb2312");
PrintWriter out = resp.getWriter();
//输出页眉
out.print(MessageFormat.format(strHeader,new Object[]{strTitle+" - 请输入尊姓大名"}));
//输出表单
out.print(MessageFormat.format(strForm,new Object[]{req.getContextPath()+req.getServletPath()}));
//输出页脚
out.print(strFooter);
out.flush();
}
protected void printHello(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException{
//获取用户输入的数据
String name = req.getParameter("name");
if(name==null)
name = "无名氏";
else
//对用户输入的数据作必要的字符编码转换
name = new String(name.getBytes("iso-8859-1"));
//在使用PrintWriter前得先设置Content Type
resp.setContentType("text/html;charset=gb2312");
PrintWriter out = resp.getWriter();
//输出页眉
out.print(MessageFormat.format(strHeader,new Object[]{strTitle+" - 欢迎您"}));
//输出欢迎信息
out.print(MessageFormat.format(strHello,new Object[]{name}));
//输出页脚
out.print(strFooter);
out.flush();
}
protected void printError(String error, HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException{
//在使用PrintWriter前得先设置Content Type
resp.setContentType("text/html;charset=gb2312");
PrintWriter out = resp.getWriter();
//输出页眉
out.print(MessageFormat.format(strHeader,new Object[]{strTitle+" - 出错信息"}));
//输出出错信息
out.print(MessageFormat.format(strError,new Object[]{error}));
//输出页脚
out.print(strFooter);
out.flush();
}
}