Java教程
13
本文主要是介绍13，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！
1
package mt;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class BaseDao {
public Connection getConnection() {
Connection con = null;
try {
Class.forName("com.mysql.jdbc.Driver");
con=DriverManager.getConnection("jdbc:mysql://localhost:3306/user","root","990511");
} catch (Exception e) {
e.printStackTrace();
}
return con;
}
protected void closeAll(Connection con,PreparedStatement ps,ResultSet rs){
try {
if(rs != null)
rs.close();
if(ps != null)
ps.close();
if(con != null)
con.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
package mt;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import glg2.Email;
public class EmailDao extends BaseDao {
public List<Email> getAll(String uname) {
List<Email> list = new ArrayList<Email>();
Connection con = getConnection();
PreparedStatement pred = null;
ResultSet resultSet = null;
String sql = "select * from email where sjr=?";
try {
pred = con.prepareStatement(sql);
pred.setString(1, uname);
resultSet = pred.executeQuery();
while (resultSet.next()) {
Email email = new Email();
email.setId(resultSet.getInt(1));
email.setFjr(resultSet.getString(2));
email.setSjr(resultSet.getString(3));
email.setTitle(resultSet.getString(4));
email.setContent(resultSet.getString(5));
email.setTime(resultSet.getDate(6));
email.setZt(resultSet.getInt(7));
list.add(email);
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
closeAll(con, pred, resultSet);
}
return list;
}
public void addEmail(Email e) {
Connection con = getConnection();
String sql = "insert into email(fjr,sjr,title,content,time,zt) values(?,?,?,?,?,0)";
PreparedStatement pred = null;
try {
pred = con.prepareStatement(sql);
pred.setString(1, e.getFjr());
pred.setString(2, e.getSjr());
pred.setString(3, e.getTitle());
pred.setString(4, e.getContent());
pred.setDate(5, new java.sql.Date(new Date().getTime()));
pred.executeUpdate();
} catch (SQLException e1) {
e1.printStackTrace();
} finally {
closeAll(con, pred, null);
}
}
public void del(int id) {
Connection con = getConnection();
String sql = "delete from email where id=?";
PreparedStatement pred = null;
try {
pred = con.prepareStatement(sql);
pred.setInt(1, id);
pred.executeUpdate();
} catch (SQLException e1) {
e1.printStackTrace();
} finally {
closeAll(con, pred, null);
}
}
public void update(int id) {
Connection con = getConnection();
String sql = "update email set zt=1 where id=?";
PreparedStatement pred = null;
try {
pred = con.prepareStatement(sql);
pred.setInt(1, id);
pred.executeUpdate();
} catch (SQLException e1) {
e1.printStackTrace();
} finally {
closeAll(con, pred, null);
}
}
public Email look(int id) {
Connection con = getConnection();
String sql = "select id,fjr,sjr,title,content,time from email where id=?";
PreparedStatement pred = null;
ResultSet resultSet = null;
try {
pred = con.prepareStatement(sql);
pred.setInt(1, id);
resultSet = pred.executeQuery();
while (resultSet.next()) {
Email email = new Email();
email.setId(resultSet.getInt(1));
email.setFjr(resultSet.getString(2));
email.setSjr(resultSet.getString(3));
email.setTitle(resultSet.getString(4));
email.setContent(resultSet.getString(5));
email.setTime(resultSet.getDate(6));
return email;
}
} catch (SQLException e1) {
e1.printStackTrace();
} finally {
closeAll(con, pred, resultSet);
}
return null;
}
}
package mt;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class UserDao extends BaseDao{
public int Register(String uname,String password){
int i=-1;
PreparedStatement pred=null;
Connection con=getConnection();
String sql="insert into users(uname,password)values(?,?)";
try {
pred= con.prepareStatement(sql);
pred.setString(1, uname);
pred.setString(2, password);
i=pred.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
}finally{
closeAll(con, pred, null);
}
return i;
}
public boolean Login(String uname,String password){
boolean f=false;
PreparedStatement pred=null;
ResultSet resultSet=null;
Connection con=getConnection();
String sql="select * from users where uname=? and password=?";
try {
pred=con.prepareStatement(sql);
pred.setString(1, uname);
pred.setString(2, password);
resultSet=pred.executeQuery();
while(resultSet.next()){
f=true;
}
} catch (SQLException e) {
e.printStackTrace();
}finally{
closeAll(con, pred, resultSet);
}
return f;
}
}
package mt;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class UserDao extends BaseDao{
public int Register(String uname,String password){
int i=-1;
PreparedStatement pred=null;
Connection con=getConnection();
String sql="insert into users(uname,password)values(?,?)";
try {
pred= con.prepareStatement(sql);
pred.setString(1, uname);
pred.setString(2, password);
i=pred.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
}finally{
closeAll(con, pred, null);
}
return i;
}
public boolean Login(String uname,String password){
boolean f=false;
PreparedStatement pred=null;
ResultSet resultSet=null;
Connection con=getConnection();
String sql="select * from users where uname=? and password=?";
try {
pred=con.prepareStatement(sql);
pred.setString(1, uname);
pred.setString(2, password);
resultSet=pred.executeQuery();
while(resultSet.next()){
f=true;
}
} catch (SQLException e) {
e.printStackTrace();
}finally{
closeAll(con, pred, resultSet);
}
return f;
}
}
package mt3;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import glg.EmailDao;
@WebServlet("/dodel.do")
public class DoDel extends HttpServlet {
/**
* Constructor of the object.
*/
public DoDel() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* 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 {
doPost(request, response);
}
/**
* 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 {
response.setContentType("text/html,charset=utf-8");
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
EmailDao e=new EmailDao();
String id=request.getParameter("id");
int idd=Integer.parseInt(id);
e.del(idd);
request.getRequestDispatcher("main.jsp").forward(request, response);
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}
package mt3;
import java.io.IOException;
import java.io.PrintWriter;
import javax.jms.Session;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import glg.UserDao;
@WebServlet("/dologin.do")
public class DoLogin extends HttpServlet {
/**
* Constructor of the object.
*/
public DoLogin() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* 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 {
doPost(request, response);
}
/**
* 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 {
response.setContentType("text/html,charset=utf-8");
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
String uname = request.getParameter("uname");
String password = request.getParameter("password");
UserDao ud = new UserDao();
HttpSession session = request.getSession();
PrintWriter out = response.getWriter();
if (ud.Login(uname, password)) {
session.setAttribute("uname", uname);
request.getRequestDispatcher("main.jsp").forward(request, response);
} else {
out.print("鐧诲綍澶辫触锛屽嵆灏嗚烦鍥炵櫥褰曢〉.....");
response.setHeader("refresh", "2;url=Login.jsp");
}
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException
* if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}
这篇关于13的文章就介绍到这儿，希望我们推荐的文章对大家有所帮助，也希望大家多多支持为之网！
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