usersearch.java

整个系统采用MVC开发模式

package Manager;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import bean.User;
import bean.UserDAO;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class UserSearch extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public UserSearch() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}


	
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		response.setContentType("text/html; charset=GBK");
	    response.setCharacterEncoding("gbk");
	    String username=request.getParameter("username");
	    PrintWriter out = response.getWriter();
	    //创建UserDAO对象
		UserDAO userdao=new UserDAO();
		//定义ArrayList对象用来存放查询结果
		ArrayList<User> result=new ArrayList<User>();
		
		//创建sql语句
		if(username.equals("all")){
			String sql="select * from user";
			try{
				
				result=userdao.userSelect(sql);
				User user=new User();
				user=result.get(0);
				System.out.print(user.getUsername());
			    HttpSession session=request.getSession();				
				
		         session.setAttribute("result",result);
		        System.out.print("bbbb");
                response.sendRedirect("UserManage/UserAll.jsp");
				
			
				}catch(Exception e){response.sendRedirect("error.jsp");}
				
		}
		
		else{
		String sql="select * from user where username like '%"+username+"%'";
        /*
         * 执行查询操作
         */
		try{
			System.out.println(username);
		    result=userdao.userSelect(sql);
		
        if(result.size()==0){
        	out.print("没有搜到符合你条件的记录");
        	out.print("<a href='UserManage/UserInquire.jsp'>"+"返回"+"</a>");
        }
        else{
		HttpSession session=request.getSession(true);
		
		session.setAttribute("result", result);
		
		response.sendRedirect("UserManage/UserInquireRes.jsp");
		
        }
		}catch(Exception e){
			response.sendRedirect("error.jsp");
			}
		
	}


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

		doGet(request,response);
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}