📄 guestbook.java
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import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class GuestBook extends HttpServlet{
public void doPost(HttpServletRequest request,HttpServletResponse response)
throws ServletException, IOException
{
//首先设置响应的content type 头部
response.setContentType("text/html");
//得到响应的PrinterWriter以返回文本给客户端。
PrintWriter toClient = response.getWriter();
int isbad=0;
String msg="";
String sucmsg="Error";
String name=request.getParameter("name");
String note=request.getParameter("note");
if("".equals(name)){
isbad=1;
msg="<li>姓名不能为空</li>";
}
if("".equals(note)){
isbad=1;
msg=msg+"<li>留言不能为空</li>";
}
if(isbad==0){
String mystr="";
try{
//打开一个文件写入留言。
String resultDir="c:";
//String resultDir=System.getProperty("user.dir");
FileWriter resultFile = new FileWriter(resultDir+
System.getProperty("file.separator")+ "guestbook.txt",true);
PrintWriter toFile = new PrintWriter(resultFile);
toFile.println("<hr>");
toFile.println("Name:"+name+"<br>");
toFile.println("Content:<p>"+note+"</p>");
toFile.println("<hr>");
sucmsg="Thank you for participating";
resultFile.close();
}catch(IOException ie){
toClient.println("A problem occured.Please try again.");
}catch(Exception e){
}
}
//向留言用户返回信息
toClient.println("<html>");
toClient.println("<title>Thank you!</title>");
toClient.println("<p>"+ sucmsg +"</p>");
toClient.println("<p>"+ msg + "</p>");
toClient.println("<p><a href='javascript:history.back(1);'>return</a></p>");
toClient.println("<html>");
toClient.close();
}
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