sendletterservlet.java

运用JSP/servlet/JavaBean 技术

package com.lovo.controller;

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;

import com.lovo.po.Mail;
import com.lovo.service.IMailBo;
import com.lovo.service.IMailBoImpl;
import com.lovo.service.IUserBo;
import com.lovo.service.IUserBoImpl;

public class SendLetterServlet extends HttpServlet
{
	/** userBo接口，用于业务方法调用 */
	private IUserBo userBo = new IUserBoImpl();
	/** mailBo接口，用于业务方法调用 */
	private IMailBo mailBo = new IMailBoImpl();

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException
	{
		String message = "";//反馈信息
		boolean canSend = true;//标记信件是否可以发送
		request.getSession().removeAttribute("isUpdate");
		/** 设置响应文件类型及字符集编码 */
		response.setContentType("text/html; charset=utf-8");
		/** 设置响应头，让浏览器不缓存信息 */
		response.setHeader("Cache-control", "no-cache");
		/** 获取发件人 */
		String whoSended = request.getParameter("whoSended");
		/** 获取所有收件人 */
		String emailNames = request.getParameter("emailNames");
		/** 获取邮件主题 */
		String mailTitle = request.getParameter("mailTitle");
		if(mailTitle.equals("")){mailTitle = "（无主题）";}
		/** 获取邮件内容 */
		String mailContent = request.getParameter("mailContent");
		/** 检查所有收件人是否都存在 */
		String[] names = emailNames.split(";");//存收件人帐号
		int[] userIds = new int[names.length];//存收件人userId
		int judge = 0;//用于存当前用户userId
		/**
		 * 循环条件，遍历每个收件人帐号
		 */
		for(int i = 0; i < names.length; i++)
		{
			/** 此方法获得当前帐号的userId */
			judge = userBo.isEmailNameExist(names[i]);
			/**
			 * 如果当前userId为-1，说明没有这个用户，不能发送
			 * 如果当前userId不为-1，说明有这个用户，将他的userId存入userIds数组
			 */
			if(judge == -1)
			{
				/** 用户不存在，提示用户哪个帐号录入错误 */
				message = "收件人" + names[i] + "不存在请确认收件人！";
				/** canSend设置为false表示不做发送信件操作 */
				canSend = false;
				/** 无需继续检测，跳出检测帐号的循环 */
				break;
			}
			else
			{
				/** 用户存在，将其userId存入userIds数组 */
				userIds[i] = judge;
			}
		}
		/**
		 * 如果canSend为true，那么发送信件
		 */
		if(canSend)
		{
			/** 收件人都存在可以发送信件，开始构建信件并发送 */
			Mail mail = null;//临时存要发送的信件
			/**
			 * 循环条件，遍历userId
			 */
			for(int i = 0; i < userIds.length; i++)
			{
				/** 创建一个待发信件 */
				mail = new Mail();
				/** 设置待发信件状态码 */
				mail.setMailStatus(Mail.NOT_READ_MAIL);
				/** 设置待发信件标题 */
				mail.setMailTitle(mailTitle);
				/** 设置待发信件内容 */
				mail.setMailContent(mailContent);
				/** 设置待发信件所属用户 */
				mail.setUserId(userIds[i]);
				/** 设置待发信件的发件人 */
				mail.setWhoSended(Integer.parseInt(whoSended));
				/** 设置待发信件的收件人 */
				mail.setWhoReceive(userIds[i]);
				/** 发送信件 */
				mailBo.sendMail(mail);
			}
			/** 存一份信件到已发送 */
			mail = new Mail();
			mail.setMailStatus(Mail.SENDED_MAIL);
			mail.setMailTitle(mailTitle);
			mail.setMailContent(mailContent);
			mail.setUserId(Integer.parseInt(whoSended));
			mail.setWhoSended(Integer.parseInt(whoSended));
			/** 如果收件人为一个人，那么就设为这个人，否则设为自己 */
			if(userIds.length == 1)
			{
				mail.setWhoReceive(userIds[0]);
			}
			else
			{
				mail.setWhoReceive(Integer.parseInt(whoSended));
			}
			mailBo.sendMail(mail);
			message = "发送成功！";
		}
		/** 获得输出流 */
		PrintWriter writer = response.getWriter();
		/** 反馈操作信息 */
		writer.println(message);
		writer.close();
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException
	{
		doGet(request, response);
	}

}