web验证码实现

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3、建立一个实现add，checklogin，getUser方法的类

package service;

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 model.User;

import util.DBO;

public class ManagerImpls implements Manager{//implements连接对应的接口，进行接口的实现

public boolean add(User u) {//注册添加的方法

boolean falst = false;

try {

Connection conn = DBO.getConnection();

String sql = “insert into user(tel,password,code) value(?,?,?)”;

PreparedStatement pst = conn.prepareStatement(sql);

pst.setInt(1, u.getTel());

pst.setString(2,u.getPassword());

pst.setString(3, u.getCode());

//int rows = pst.executeUpdate();//受影响的行数

int rows = pst.executeUpdate();

if (rows > 0) {

falst = true;

System.out.println(“添加完成”);

} else {

System.out.println(“添加失败！”);

}

} catch (Exception e) {

e.printStackTrace();

}

return falst;

}

public boolean checkLogin(int tel,String password) {//登录的方法

boolean flag = false;

Statement st = null;

ResultSet r = null;

java.sql.Connection conn = null;

conn = DBO.getConnection();
try {
st =  conn.createStatement();
} catch (SQLException e) {
e.printStackTrace();
}
String sql = "select * from user where tel=  "+tel ;
try {
r = st.executeQuery(sql);
while (r.next()) {
if (r.getString("password").equals(password)) {
\\通过比较，得知是不是已经注册的值，判断是否可以登录
flag = true;
}
}
} catch (SQLException e) {
e.printStackTrace();
}
return flag;

}

public List getUser()//获得对象信息的方法

{

ArrayList list = new ArrayList();

java.sql.Connection conn = null;

java.sql.Statement st = null;

ResultSet r = null;

try {
conn = DBO.getConnection();
String sql = "select * from user " ;
st =  conn.createStatement();
r =  (ResultSet) st.executeQuery(sql);
while(r.next())
{
User user = new User();
user.setTel(r.getInt("tel"));
user.setPassword(r.getString("password"));
user.setCode(r.getString("code"));

list.add(user);
}
} catch (Exception e) {
e.printStackTrace();
}
return  list;

}

}

4、对应的测试程序，

package test;

import java.sql.Connection;

import java.util.List;

import model.User;

import service.Manager;

import service.ManagerImpls;

import util.DBO;

public class Test {

public static void main(String[] args) {

Connection conn = DBO.getConnection();

if(conn != null)

{

System.out.println(“Connection Success.”);

}

Manager m = new ManagerImpls();

// for(int i=789;i<791;i++){//如果测试每次添加是否成功，需要更换新的值，添加过的值不能再进行添加

// User user = new User();

// user.setTel(i);

// user.setPassword(“password”);

// user.setCode(“code”);

// boolean flag = m.add(user);

// }

if(m.checkLogin(0, “password”)==true)

{

System.out.println(“登录成功！”);

}

/* Manager sm = new ManagerImpls();

List list = sm.getUser();

User stu = new User();

System.out.println(stu.getPassword());

System.out.println(stu.getCode());*/

}

}

接下来是相关代码