java logic_java logic怎么做用户登录
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，具體點可以這樣：創建一個用戶表，里邊包括LoginName(登錄62616964757a686964616fe58685e5aeb931333337383233名)，UserName(用戶名)，Password(密碼)，Age(年齡)，Address(地址)。然后編寫Java程序(用MVC架構)模型層(M)：DBConnection.java(負責連接數據庫)
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.*;
public class DBConnection {
private static final String DRIVER_CLASS = "sun.jdbc.odbc.JdbcOdbcDriver";
private static final String DB_URL = "jdbc:odbc:text";
public DBConnection() {
}
public static Connection getConnection() {
Connection conn = null;
try {
Class.forName(DRIVER_CLASS);
conn = DriverManager.getConnection(DB_URL);
} catch (SQLException ex) {
System.out.println(ex.getMessage());
} catch (ClassNotFoundException ex) {
System.out.println(ex.getMessage());
}
return conn;
}
}
第2個負責數據庫查詢操作的類：DBUserManager.java
import edu.systop.text.model.entity.User;
import edu.systop.text.model.dao.DBConnection;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.DriverManager;
import java.sql.*;
public class DBUserManager {
private static final String SQL_SELECT =
"SELECT LoginName,UserName,PassWord,Age,Address FROM UserInfo WHERE LoginName = ? AND PassWord = ?";
public DBUserManager() {
}
public boolean checkDB(User u) {
boolean b = false;
Connection conn = null;
PreparedStatement psmt = null;
ResultSet rs = null;
conn = DBConnection.getConnection();
try {
psmt = conn.prepareStatement(SQL_SELECT);
psmt.setString(1, u.getLoginName());
psmt.setString(2, u.getPassWord());
rs = psmt.executeQuery();
b = rs.next();
if (rs.next()) {
b = true;
}
} catch (SQLException ex) {
System.out.println(ex.getMessage());
} finally {
cleanDB(rs, psmt, conn);
}
return b;
}
public User checkBC(User u) {
Connection conn = null;
PreparedStatement psmt = null;
ResultSet rs = null;
User tmp = new User();
conn = DBConnection.getConnection();
try {
psmt = conn.prepareStatement(SQL_SELECT);
psmt.setString(1, u.getLoginName());
psmt.setString(2, u.getPassWord());
rs = psmt.executeQuery();
if (rs.next()) {
tmp.setLoginName(rs.getString(1));
tmp.setUserName(rs.getString(2));
tmp.setAge(rs.getInt(4));
tmp.setAddress(rs.getString(5));
}
} catch (SQLException ex) {
System.out.println(ex.getMessage());
} finally {
cleanDB(rs, psmt, conn);
}
return tmp;
}
public void cleanDB(ResultSet rs, PreparedStatement psmt, Connection conn) {
try {
if (rs != null) {
rs.close();
}
if (psmt != null) {
psmt.close();
}
if (conn != null) {
conn.close();
}
} catch (SQLException ex) {
System.out.println(ex.getMessage());
}
}
第3個實體用戶類：User.java
package edu.systop.text.model.entity;
public class User {
private String loginName;
private String userName;
private String passWord;
private int age;
private String address;
public User() {
}
public void setLoginName(String loginName) {
this.loginName = loginName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public void setPassWord(String passWord) {
this.passWord = passWord;
}
public void setAge(int age) {
this.age = age;
}
public void setAddress(String address) {
this.address = address;
}
public String getLoginName() {
return loginName;
}
public String getUserName() {
return userName;
}
public String getPassWord() {
return passWord;
}
public int getAge() {
return age;
}
public String getAddress() {
return address;
}
}
然后編寫控制層(C)：GetInfoServlet.java
package edu.systop.text.control;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import edu.systop.text.model.entity.User;
import edu.systop.text.model.service.UserManager;
public class GetInfoServlet extends HttpServlet {
private static final String CONTENT_TYPE = "text/html; charset=GBK";
//Initialize global variables
public void init() throws ServletException {
}
//Process the HTTP Get request
public void doGet(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
}
//Process the HTTP Post request
public void doPost(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
String loginName = request.getParameter("loginName");
String passWord = request.getParameter("passWord");
User u = new User();
u.setLoginName(loginName);
u.setPassWord(passWord);
UserManager m = new UserManager();
RequestDispatcher d;
if (m.checkUser(u)) {
User o = m.checkBC(u);
request.setAttribute("JavaBEAN",o);
d = request.getRequestDispatcher("GetInfoUser.jsp");
} else {
d = request.getRequestDispatcher("GetInfoFinale.jsp");
}
d.forward(request, response);
}
//Clean up resources
public void destroy() {
}
}
最后，創建表示層(V)：包括3個Jsp(登錄頁面GetInfo.jsp、登錄成功頁面GetInfoUser.jsp、登錄失敗頁面GetInfoFinale.jsp)
上面的就是Jsp結合Servlet用MVC架構寫的用戶登錄程序。
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