selectservlet.java

用j2ee开发的b/s通讯录. 欢迎各位使用

package y2javaee.xmal1.servlet;

import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import y2javaee.xmal1.common.Validate;
import y2javaee.xmal1.entity.Users;
import y2javaee.xmal1.operation.BookBo;

/**
 * 处理查询通讯录功能的Servlet
 */
public class SelectServlet extends HttpServlet {

	private static final long serialVersionUID = 1L;

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		this.doPost(request, response);
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		// 中文处理
		response.setContentType("text/html;charset=gb2312");
		// 判断用户是否为登录用户
		HttpSession session = request.getSession(false);

		if (session == null || session.getAttribute("user") == null) {
			// 如果不是登录用户，则返回到首页，进行登录
			response.sendRedirect("index.jsp");
		} else {
			// 获取参数relation值
			String relation = Validate.validStringNull(request
					.getParameter("relation"));
			Users user = (Users) session.getAttribute("user");
			int userId = user.getUserId();
			BookBo bookBo = new BookBo();
			List list = null;

			if ("".equals(relation)) {
				// 如果relation为“”，则查询当前用户相关的所有通讯录信息
				list = bookBo.selectAllBook(userId);
			} else {
				// 如果relation的值不为“”，那查询与当前用户的关系为relation值的通讯录信息。
				list = bookBo.selectBookByRelation(userId, relation);
			}

			request.setAttribute("bookList", list);
			request.getRequestDispatcher("bookContent.jsp").forward(request,
					response);
		}

	}

}