一个简单的统计学分系统的小程序

一个学分系统的小程序

jsp页面我就不写了， 下面我只写业务类吧



、

LoginAction.java

package com.cn.attence.action;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

import com.cn.attence.dao.DBConnect;
import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport{
private String username;
private String password;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}

public String execute() throws Exception{

DBConnect db = new DBConnect();
Connection conn = db.getConnection();
Statement stmt = conn.createStatement();
List list = new ArrayList();
String sql = "select * from userinfo";
ResultSet rs = stmt.executeQuery(sql);
while( rs.next()){;
if(rs.getString("username").equals(this.username) && rs.getString("password").equals(this.password))
return SUCCESS;
}
return ERROR;
}
}




注册控制层RegisterAction.java

package com.cn.attence.action;

import java.sql.Connection;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import com.cn.attence.dao.DBConnect;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class RegisterAction extends ActionSupport {
private String username;
private String password;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
@Override
public String execute() throws Exception {
// TODO Auto-generated method stub
DBConnect db = new DBConnect();
Connection conn = db.getConnection();
Statement stmt = conn.createStatement();
List list = new ArrayList();
String sql = "insert into userinfo(username,password)  values('"+username+"','"+password+"')";
stmt.executeUpdate(sql);
conn.commit();
return SUCCESS;

}
}

修改UpdatestudentAction.java
package com.cn.attence.action;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.ServletActionContext;

import com.cn.attence.dao.DBConnect;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class UpdatestudentAction extends ActionSupport{
private int id;
private String name;
private String classe;
private int checke;
private String num;
private String sum1;

public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}

public String getSum1() {
return sum1;
}
public void setSum1(String sum1) {
this.sum1 = sum1;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getClasse() {
return classe;
}
public void setClasse(String classe) {
this.classe = classe;
}
public int getChecke() {
return checke;
}
public void setChecke(int checke) {
this.checke = checke;
}
public String getNum() {
return num;
}
public void setNum(String num) {
this.num = num;
}
public String execute() throws SQLException, FileNotFoundException, IOException, ClassNotFoundException
{
DBConnect db = new DBConnect();
Connection conn = db.getConnection();

List list = new ArrayList();
String sql = "update studentinfo set name=?,classe=?,checke=?,num=?,sum1=? where id="+id;
System.out.println("sql语句是"+sql);
PreparedStatement stmt = conn.prepareStatement(sql);
stmt.setString(1, name);
stmt.setString(2, classe);
stmt.setInt(3, checke);
stmt.setString(4, num);
stmt.setString(5, sum1);
stmt.executeUpdate();
conn.close();
ActionContext ctx = ActionContext.getContext();
Map session = ctx.getSession();
session.put("list", list);
return SUCCESS;
}
}




ShowstudentAction.java

package com.cn.attence.action;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import com.cn.attence.dao.DBConnect;
import com.cn.entity.StudentCredit;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class ShowstudentAction extends ActionSupport{
public String execute() throws Exception{

DBConnect db = new DBConnect();
Connection conn = db.getConnection();
Statement stmt = conn.createStatement();
String sql = "select * from studentinfo";
ResultSet rs = stmt.executeQuery(sql);
List list = new ArrayList();
while(rs.next()){
StudentCredit student =new StudentCredit();
student.setId(rs.getInt("id"));
student.setName(rs.getString("name"));
student.setNum(rs.getString("num"));
student.setClasse(rs.getString("classe"));
student.setChecke(rs.getInt("checke"));
list.add(student);
}
conn.close();
ActionContext ctx = ActionContext.getContext();
Map session = ctx.getSession();
session.put("list", list);
return SUCCESS;
}
}

删除操作：DeleteAction.java

package com.cn.attence.action;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.ServletActionContext;

import com.cn.attence.dao.DBConnect;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class DeleteAction extends ActionSupport{

public String execute() throws SQLException, FileNotFoundException, IOException, ClassNotFoundException
{
HttpServletRequest request = ServletActionContext.getRequest();
String  id=request.getParameter("id");
System.out.println("id号是"+id);
ActionContext ct = ActionContext.getContext();
DBConnect db = new DBConnect();
Connection conn = db.getConnection();
String sql = "delete from studentinfo where id ="+id+"";
System.out.println(sql);
Statement stmt = conn.createStatement();
stmt.executeUpdate(sql);

conn.commit();
return SUCCESS;
}
}

DBConnect.java

package com.cn.attence.dao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class DBConnect {
public static Connection getConnection() {
String url = "jdbc:mysql://localhost:3306/studentAttence?useUnicode=true&characterEncoding=gbk";
String user = "root";
String psw = "root";
Connection conn = null;
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
try {
conn = DriverManager.getConnection(url, user, psw);
conn.setAutoCommit(false);
return conn;
} catch (SQLException e) {
e.printStackTrace();
}
return null;
}
}

StudentDao.java

package com.cn.attence.dao;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import com.cn.entity.StudentCredit;
import com.opensymphony.xwork2.ActionContext;

public class StudentDao {
//条件查询
/**
*  通过id 取得某个学生信息
* @param id
* @return
*/
public StudentCredit getSuById(int id) throws Exception{
StudentCredit student=null;
DBConnect db = new DBConnect();
Connection conn = db.getConnection();
Statement stmt = null;
try {
stmt = conn.createStatement();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String sql = "select * from studentinfo where id="+id;
System.out.println("条件查询sql语句"+sql);
ResultSet rs = stmt.executeQuery(sql);
if(rs.next()){
student =new StudentCredit();
student.setId(rs.getInt("id"));
student.setName(rs.getString("name"));
student.setNum(rs.getString("num"));
student.setClasse(rs.getString("classe"));
student.setChecke(rs.getInt("checke"));
student.setSum1(rs.getString("sum1"));
System.out.println("对象值"+student.getSum1());
}

conn.close();
return student;
}
}