?? readservlet.java
字號:
package com.wxpn.tutorial.servlet;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class for Servlet: ReadServlet
*/
public class ReadServlet extends javax.servlet.http.HttpServlet implements
javax.servlet.Servlet {
/*
* (non-Java-doc)
*
* @see javax.servlet.http.HttpServlet#HttpServlet()
*/
public ReadServlet() {
super();
}
/*
* (non-Java-doc)
*
* @see javax.servlet.http.HttpServlet#doGet(HttpServletRequest request,
* HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
response.setContentType("text/html;charset=UTF-8");
String _id = request.getParameter("id");
if (_id == null) {
request.setAttribute("error", "<h1>閱讀留言失敗!</h1>");
try {
request.getRequestDispatcher("/error.jsp").forward(request,
response);
} catch (Throwable t) {
getServletContext().log(t.getMessage());
}
} else {
int id = Integer.parseInt(_id);
BBSMsgMgr mgr = new BBSMsgMgr();
mgr.read(id);
Collection c = mgr.getChildren(id);
if (c == null) {
request.setAttribute("error", "<h1>不存在該留言!</h1>");
try {
request.getRequestDispatcher("/error.jsp").forward(request,
response);
} catch (Throwable t) {
getServletContext().log(t.getMessage());
}
} else {
request.setAttribute("c", c);
try {
request.getRequestDispatcher("/read.jsp").forward(request,
response);
} catch (Throwable t) {
getServletContext().log(t.getMessage());
}
}
}
}
}
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