基于JDBC的通讯录练手：
项目以MVC模式开发，包名：
cn.itcast.txl.domain;
cn.itcast.txl.dao;
cn.itcast.txl.dao.impl;
cn.itcast.txl.service;
cn.itcast.txl.service.impl;
cn.itcast.txl.controller;
domain层
User.java
public void User(){
private int id;
private String name;
private String sex;
private String phone;
private String QQ;
private String Email;
private String address;
//提供有参函数，无参函数
//提供set和get方法
}
dao层
UserDao.java
public interface UserDao {
public void save(User user);
public void delete(int id);
public void update(User user);
public Object query();
//根据id获取联系人
public User get(int id);
}
UserDaoImpl.java
//添加联系人
public void save(User user) {
//定义变量
Connection conn = null;
PreparedStatement state = null;
try {
//初始化参数
conn = DBUtils.getConnection();
String sql = "insert into t_user (name,sex,phone,QQ,Email,address) values (?,?,?,?,?,?)";
//设置参数
state = conn.prepareStatement(sql);
state.setString(1, user.getName());
state.setString(2, user.getSex());
state.setString(3, user.getPhone());
state.setString(4, user.getQQ());
state.setString(5, user.getEmail());
state.setString(6, user.getAddress());
//执行
state.execute();
System.out.println("添加联系人成功.......................");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
throw new RuntimeException("添加联系人失败....................");
}finally{
//释放资源
DBUtils.closeAll(null, state, conn);
}
}
public void update(User user) {
//定义变量
Connection conn = null;
PreparedStatement state = null;
try {
//初始化参数
conn = DBUtils.getConnection();
String sql = "update t_user set name=?,sex=?,phone=?,QQ=?,Email=?,address=? where id=?";
//设置参数
state = conn.prepareStatement(sql);
state.setString(1, user.getName());
state.setString(2, user.getSex());
state.setString(3, user.getPhone());
state.setString(4, user.getQQ());
state.setString(5, user.getEmail());
state.setString(6, user.getAddress());
state.setInt(7, user.getId());
System.out.println("id="+user.getId());
//执行
state.execute();
System.out.println("修改联系人成功.......................");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
throw new RuntimeException("修改联系人失败....................");
}finally{
//释放资源
DBUtils.closeAll(null, state, conn);
}
}
public Object query() {
//定义变量
String sql = null;
Connection conn = null;
PreparedStatement state = null;
ResultSet set = null;
User user = null;
Map
//初始化
try {
conn = DBUtils.getConnection();
sql = "select id,name,sex,phone,QQ,Email,address from t_user";
state = conn.prepareStatement(sql);
//执行
set = state.executeQuery();
//获取
while(set.next()){
int id = set.getInt(1);
String name = set.getString(2);
String sex = set.getString(3);
String phone = set.getString(4);
String QQ = set.getString(5);
String Email = set.getString(6);
String address = set.getString(7);
//封装为user对象
user = new User(id,name, sex, phone, QQ, Email, address);
//存储到Map集合中
users.put(name, user);
}
//成功
System.out.println("获取所有联系人成功.........");
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
throw new RuntimeException("获取所有联系人失败.........");
}finally{
DBUtils.closeAll(set, state, conn);
}
return users;
}
public void delete(int id) {
String sql = null;
Connection conn = null;
PreparedStatement state = null;
try {
conn = DBUtils.getConnection();
sql = "delete from t_user where id = ?";
//设置参数
state=conn.prepareStatement(sql);
state.setInt(1, id);
//执行
state.execute();
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException("删除失败了........"+e);
}finally{
DBUtils.closeAll(null, state, conn);
}
}
public User get(int id) {
String sql = null;
Connection conn = null;
PreparedStatement state = null;
ResultSet set = null;
User user =null;
//初始化
try {
conn = DBUtils.getConnection();
sql = "select name,sex,phone,QQ,Email,address from t_user where id = ?";
state = conn.prepareStatement(sql);
state.setInt(1, id);
//执行
set = state.executeQuery();
//获取
while(set.next()){
String name = set.getString(1);
String sex = set.getString(2);
String phone = set.getString(3);
String QQ = set.getString(4);
String Email = set.getString(5);
String address = set.getString(6);
//封装为user对象
user = new User(name, sex, phone, QQ, Email, address);
break;
}
user.setId(id);
//成功
System.out.println("获取单个人成功.........");
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
throw new RuntimeException("获取单个联系人失败.........",e);
}finally{
DBUtils.closeAll(set, state, conn);
}
return user;
}
}
DBUtils.java
/*
* 该工具类主要任务是：
* 1、加载配置文件
* 2、返回数据库的连接
* 3、释放数据库连接的所有资源
*/
public class DBUtils {
//使用连接池对象
private static ComboPooledDataSource ds = new ComboPooledDataSource();
//提供获取Connection连接方法
public static Connection getConnection(){
Connection conn = null;
try {
conn = ds.getConnection();
System.out.println("测试：连接池中的连接对象......");
} catch (SQLException e) {
e.printStackTrace();
throw new RuntimeException("连接失败....");
}
return conn;
}
//提供一个释放所有资源的方法
public static void closeAll(ResultSet set,Statement state,Connection conn){
try {
if( set != null )
set.close();
} catch (Exception e) {
set = null;
}
try {
if( state != null )
state.close();
} catch (Exception e) {
state = null;
}
try {
if( conn != null )
conn.close();
} catch (Exception e) {
conn = null;
}
}
}
UserService.java
public interface UserService(){
public void save(User user);
public void delete(int id);
public void update(User user);
public Map
public User get(int id);
}
UserServiceImpl.java
public class UserServiceImpl implement UserService{
private UserDao userDao = new UserDaoImpl();
.......
}
UserServlet.java
public class UserServlet extends HttpServlet{
//定义服务对象
private UserService service = new UserServiceImpl();
doget(){
this.dopost(request,response);
};
dopost(){
request.setCharactorEncoding("UTF-8");
String method = request.getParameter("method");
if(method.equals("list")){
list(request,response);
}else if(method.equals("save")){
save(request,response);
}else if(method.equals("saveAdd")){
saveAdd(request,response);
}else if(method.equals("updateUser")){
updateUser(request, response);
}else if(method.equals("get")){
get(request, response);
}else if(method.equals("delete")){
delete(request, response);
}
};
//处理用户提交查询的请求
public void list(HttpServletRequest request,HttpServletResponse response){
LinkedHashMap
request.setAttribute("users",user);
String path = "/WEB-INF/list.jsp";
request.getRequestDispatcher(path).forward(request,response);
}
//接收用户的添加请求，转发到增加页面
public void save(HttpServletRequest request,HttpServletResponse response){
String path = "/WEB-INF/addUser.jsp";
request.getRequestDispatcher(path).forward(request,response);
}
public void saveAdd(HttpServletRequest request,HttpServletResponse response){
User user = new User();
user.setName(request.getParameter("name"));
user,setSex(request.getParameter("sex"));
user.setPhone(request.getParameter("phone"));
user.setQQ(request.getParameter("QQ"));
user.setEmail(request.getParameter("Email"));
user.setAddress(request.getParameter("address"));
service.save(user);
String path = "/UserServlet?method=list";
request.getRequestDispathcher(path).forward(request,response);
}
public void delete(HttpServletRequest request,HttpServletResponse response){
int id = Integer.parseInt(request.getParameter("id"));
sevice.delete(id);
String path = "/UserServlet?method=list";
request.getRequestDispatcher(path).forward(request,response);
}
//获取跳转到修改页面的请求带ID
public void get(HttpServletRequest request,HttpServletResponse response){
String path = "/WEB-INF/updateUser.jsp";
User user = service.get(Integer.parseInt(request.getParameter("id")));
request.setAttribute("user",user);
request.getRequsetDispatcher(path).forward(request,response);
}
public void update(HttpServletRequest request,HttpServletResponse response){
User user = new User();
user.setId(Integer.parseInt(request,getParameter("id")));
user.setName(request.getParameter("name"));
user.setSex(request.getParameter("sex"));
user.setPhone(request.getParameter("phone"));
user.setQQ(request.getParameter("QQ"));
user.setEmail(request.getParameter("Email"));
user.setAddress(request.getParameter("address"));
service.update(user);
String path = "/Userservlet?method=list";
request.getRequestDispatcher(path).forward(request,response);
}
}
jsp页面
list.jsp
通讯录
姓名
性别
电话
QQ
Email
地址
操作
${user.value.name}
${user.value.sex}
${user.value.phone}
${user.value.QQ}
${user.value.email}
${user.value.address}
删除
修改
添加
addUser.jsp
通讯录
updateUser.jsp
html>
通讯录
最后配置一个数据库连接池c3p0-config.xml