知識點:jsp servlet,MySQL數據庫的基本操作,前端easyui框架。
適合人羣:Java初學者、在校學生,(已經學過Java基礎語法,對html有簡單的瞭解,熟悉js、jquery語法)。
用到的工具:eclipse、MySQL
首先看下系統的截圖
dao層的代碼如下 所示:
package com.ischoolbar.programmer.dao;
import java.sql.ResultSet;
import java.sql.SQLException;
import com.ischoolbar.programmer.model.Admin;
import com.ischoolbar.programmer.model.Clazz;
/**
*
* 公衆號:springmeng
*管理員數據庫操作封裝
*/
public class AdminDao extends BaseDao {
public Admin login(String name ,String password){
String sql = "select * from s_admin where name = '" + name + "' and password = '" + password + "'";
ResultSet resultSet = query(sql);
try {
if(resultSet.next()){
Admin admin = new Admin();
admin.setId(resultSet.getInt("id"));
admin.setName(resultSet.getString("name"));
admin.setPassword(resultSet.getString("password"));
admin.setStatus(resultSet.getInt("status"));
return admin;
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
public boolean editPassword(Admin admin,String newPassword) {
// TODO Auto-generated method stub
String sql = "update s_admin set password = '"+newPassword+"' where id = " + admin.getId();
return update(sql);
}
}
filter層 的代碼如下所示:
package com.ischoolbar.programmer.filter;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
*
* 公衆號:springmeng
*攔截用戶未登錄狀態下的操作
*/
public class LoginFilter implements Filter {
@Override
public void destroy() {
// TODO Auto-generated method stub
}
@Override
public void doFilter(ServletRequest req, ServletResponse rep,
FilterChain chain) throws IOException, ServletException {
// TODO Auto-generated method stub
HttpServletRequest request = (HttpServletRequest)req;
HttpServletResponse response = (HttpServletResponse)rep;
Object user = request.getSession().getAttribute("user");
if(user == null){
//未登錄
response.sendRedirect("index.jsp");
return;
}else{
chain.doFilter(request, response);
}
}
@Override
public void init(FilterConfig arg0) throws ServletException {
// TODO Auto-generated method stub
}
}
model層的代碼如下所示:
package com.ischoolbar.programmer.model;
/**
*
* 公衆號:springmeng
*管理員實體類
*/
public class Admin {
private int id;
private String name;
private String password;
private int status = 1;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public int getStatus() {
return status;
}
public void setStatus(int status) {
this.status = status;
}
}
公中號端回覆:
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