jsp 增删改查
使用Idea创建项目
1.新建web application项目 Idea 选择 Java Enterprise -> web application
2.新版本没有web-inf文件夹 解决方法 进入project structure ->facets->点击小加号，添加web.xml
3.在web/WEB-INF目录下新建两个文件夹，classes用于存放servlet的字节码文件（.class），lib用于存放项目引用的包。
4.进入Project Structure，进入Modules（IDEA的工程）选项卡，将Paths的两个输出路径均改成第2步新建的classes。
5.然后点击Dependencies，选择右边＋号，新建JARS路径，选择第2步创建的lib文件夹 - >Jar Directory
6.进入Artifacts选项卡，将输出目录定为Tomcat安装位置的webapps下新建的该工程文件夹
7.Run->Edit Configurations配置Tomcat，设置tomcat端口等信息。
8.设置默认启动路径http://localhost:9999/web/ 或手动输入
导入servlet.jar包
file->project structure ->libraries->加号->tomcat下的lib 即可。
数据结构
CREATE TABLE `david2018_db`.`User` (
`UserId` INT NOT NULL AUTO_INCREMENT,
`UserName` NVARCHAR(30) NULL,
`PassWord` NVARCHAR(30) NULL,
`Age` INT NULL,
`Sex` NVARCHAR(30) NULL,
PRIMARY KEY (`UserId`));
测试数据
insert into david2018_db.User (UserName,PassWord,Age,Sex) values ('武大郎','123456',35,'男');
insert into david2018_db.User (UserName,PassWord,Age,Sex) values ('潘金莲','123456',18,'女');
insert into david2018_db.User (UserName,PassWord,Age,Sex) values ('西门庆','123456',24,'男');
insert into david2018_db.User (UserName,PassWord,Age,Sex) values ('武松','123456',22,'男');
insert into david2018_db.User (UserName,PassWord,Age,Sex) values ('鲁智深','123456',30,'男');
insert into david2018_db.User (UserName,PassWord,Age,Sex) values ('林冲','123456',32,'男');
创建项目结构
src/com.david.dao 数据访问层
src/com.david.domain 模型层
src/com.david.service 服务层
src/com.david.utils 工具层
src/com.david.web servlet层
创建数据库配置文件src新建 database.properties
driverName=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/david2018_db
user=root
password=1234
连接池的jar包 dbcp、pool、logging
如果报错，java.lang.NoClassDefFoundError: org/apache/commons/dbutils/ResultSetHandler
Artifacts->点击右下角fix即可
编写domain 实体类
public class User {
private int UserId;
private String UserName;
private String PassWord;
private int Age;
private String Sex;
public int getUserId() {
return UserId;
}
public void setUserId(int UserId) {
this.UserId = UserId;
}
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 int getAge() {
return Age;
}
public void setAge(int Age) {
this.Age = Age;
}
public String getSex() {
return Sex;
}
public void setSex(String Sex) {
this.Sex = Sex;
}
}
编写工具类 获得数据库连接 utils包下创建DBUtil类
public class DBUtil {
public static BasicDataSource dataSource = new BasicDataSource();
static {
try {
Properties pp = new Properties();
InputStream is = DBUtil.class.getClassLoader().getResourceAsStream("database.properties");
pp.load(is);
String driver = pp.getProperty("driverName");
String url = pp.getProperty("url");
String username = pp.getProperty("user");
String password = pp.getProperty("password");
dataSource.setDriverClassName(driver);
dataSource.setUrl(url);
dataSource.setUsername(username);
dataSource.setPassword(password);
dataSource.setInitialSize(10);//初始化连接数
dataSource.setMaxIdle(5); //最大空闲
dataSource.setMinIdle(1); //最小空闲
} catch (Exception e) {
e.printStackTrace();
}
}
public static BasicDataSource GetDataSource(){
return dataSource;
}
}
编写获得User列表接口 dao创建UserDao类
//获取全部列表
public List<User> GetAllUser() throws SQLException {
String sql = "select * from User";
QueryRunner qr = new QueryRunner(DBUtil.GetDataSource());
List<User> users = qr.query(sql,new BeanListHandler<User>(User.class));
return users;
}
编写User服务 调用dao中的 GetAllUser方法
public List<User> GetAllService() throws SQLException {
UserDao dao = new UserDao();
return dao.GetAllUser();
}
编写Servlet 将列表数据转发到jsp页面
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
UserService service = new UserService();
List<User> userList = null;
try {
userList = service.GetAllService();
} catch (SQLException e) {
e.printStackTrace();
}
request.setAttribute("userList", userList);
request.getRequestDispatcher("userList.jsp").forward(request,response);
}
配置web.xml文件
<servlet>
<servlet-name>UserList</servlet-name>
<servlet-class>com.david.web.UserList</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>UserList</servlet-name>
<url-pattern>/userList</url-pattern>
</servlet-mapping>
编写userList.jsp 渲染页面
<%@ page import="com.david.domain.User" %>
<%@ page import="java.util.List" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>用户列表</title>
</head>
<body>
<a href="AddUser.jsp">添加用户</a>
<table>
<tr>
<th>用户ID</th>
<th>用户名</th>
<th>用户密码</th>
<th>用户年龄</th>
<th>用户性别</th>
<th>操作</th>
</tr>
<%
if (request.getAttribute("userList") != null) {
%>
<%for (User u : (List<User>) request.getAttribute("userList")) {%>
<tr>
<td><%=u.getUserId()%>
</td>
<td><%=u.getUserName()%>
</td>
<td><%=u.getPassWord()%>
</td>
<td><%=u.getAge()%>
</td>
<td><%=u.getSex()%>
</td>
<td>
<a href="GetUserById?userId=<%=u.getUserId()%>">修改</a>
<a href="DeleteUser?userId=<%=u.getUserId()%>">删除</a>
</td>
</tr>
<%}%>
<%}%>
</table>
</body>
</html>
页面中可以使用el jstl语法 我就不写了
列表完成，下面编写添加用户方法
UserDao输入如下方法
//添加用户
public boolean AddUser(User user) throws SQLException {
String sql = "insert into User (UserName,PassWord,Age,Sex) values (?,?,?,?)";
QueryRunner qr = new QueryRunner(DBUtil.GetDataSource());
Object[] params = {user.getUserName(),user.getPassWord(),user.getAge(),user.getSex()};
int result = qr.update(sql,params);
return result > 0;
}
UserService
public boolean AddUser(User user) throws SQLException {
UserDao dao = new UserDao();
return dao.AddUser(user);
}
servlet
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
String userName = request.getParameter("userName");
String passWord = request.getParameter("passWord");
String age = request.getParameter("age");
String sex = request.getParameter("sex");
User u = new User();
u.setUserName(userName);
u.setPassWord(passWord);
u.setAge(Integer.parseInt(age));
u.setSex(sex);
UserService users = new UserService();
try {
boolean result = users.AddUser(u);
if(result){
response.sendRedirect("userList");
}else{
}
} catch (SQLException e) {
e.printStackTrace();
}
}
AddUser.jsp页面如下
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>添加用户</title>
</head>
<body>
<form method="post" action="AddUser">
<p>用户名:<input name="userName"></p>
<p>密码：<input name="passWord"></p>
<p>性别：
<input type="radio" checked value="男" name="sex">男
<input type="radio" value="女" name="sex">女
</p>
<p>年龄：<select name="age">
<%for (int i = 18; i < 50; i++) {%>
<option value="<%=i%>"><%=i%></option>
<%}%>
</select></p>
<p>
<button type="submit">添加</button>
</p>
<a href="userList">用户列表</a>
</form> </body>
</html>
xml文件
<servlet>
<servlet-name>AddUser</servlet-name>
<servlet-class>com.david.web.AddUser</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>AddUser</servlet-name>
<url-pattern>/AddUser</url-pattern>
</servlet-mapping>
要设置mysql的字符集编码是utf8的 否则会乱码
编写删除方法
dao中
//删除用户
public boolean DeleteUser(int userId) throws SQLException {
String sql = "delete from User where UserId = ?";
QueryRunner qr = new QueryRunner(DBUtil.GetDataSource());
return qr.update(sql,userId) > 0;
}
service
public boolean DeleteUser(int userId) throws SQLException {
UserDao dao = new UserDao();
return dao.DeleteUser(userId);
}
servlet
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String userId = request.getParameter("userId");
UserService service = new UserService();
int id = Integer.parseInt(userId);
try {
boolean result = service.DeleteUser(id);
if(result){
response.sendRedirect("userList");
}
} catch (SQLException e) {
e.printStackTrace();
}
}
web.xml
<servlet>
<servlet-name>DeleteUser</servlet-name>
<servlet-class>com.david.web.DeleteUser</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>DeleteUser</servlet-name>
<url-pattern>/DeleteUser</url-pattern>
</servlet-mapping>
userList.jsp加入路径即可
<a href="DeleteUser?userId=<%=u.getUserId()%>">删除</a>
修改
dao
//查找一条User通过UserId
public User GetUserByUserId(int userId) throws SQLException {
String sql = "select * from User where UserId = ?";
QueryRunner qr = new QueryRunner(DBUtil.GetDataSource());
User user = qr.query(sql, userId, new BeanHandler<User>(User.class));
return user;
}
//修改user
public boolean UpdateUser(User user) throws SQLException {
String sql = "update User set UserName = ?,PassWord = ?,Age = ?, Sex = ? where UserId = ?";
Object [] params = {user.getUserName(),user.getPassWord(),user.getAge(),user.getSex(),user.getUserId()};
QueryRunner qr = new QueryRunner(DBUtil.GetDataSource());
int result = qr.update(sql,params);
return result > 0;
}
service
public User GetUserByUserId(int userId) throws SQLException {
UserDao dao = new UserDao();
return dao.GetUserByUserId(userId);
}
//修改user
public boolean UpdateUser(User user) throws SQLException {
UserDao dao = new UserDao();
return dao.UpdateUser(user);
}
servlet
GetUserById
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String userId = request.getParameter("userId");
UserService service = new UserService();
try {
User u =service.GetUserByUserId(Integer.parseInt(userId));
request.setAttribute("user",u);
request.getRequestDispatcher("Update.jsp").forward(request,response);
} catch (SQLException e) {
e.printStackTrace();
}
}
updateUser
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
String userId = request.getParameter("userId");
String userName = request.getParameter("userName");
String passWord = request.getParameter("passWord");
String age = request.getParameter("age");
String sex = request.getParameter("sex");
User u = new User();
u.setUserName(userName);
u.setPassWord(passWord);
u.setAge(Integer.parseInt(age));
u.setSex(sex);
u.setUserId(Integer.parseInt(userId));
UserService users = new UserService();
try {
boolean result = users.UpdateUser(u);
if (result) {
response.sendRedirect("userList");
} else {
}
} catch (SQLException e) {
e.printStackTrace();
}
}
userList.jsp 加入修改入口
<a href="GetUserById?userId=<%=u.getUserId()%>">修改</a>
updateuser.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>修改用户</title>
</head>
<body>
<%
User u = (User)request.getAttribute("user");
%>
<form method="post" action="UpdateUser">
<p>用户Id：<input name="userId" value="<%=u.getUserId()%>" readonly></p>
<p>用户名:<input name="userName" value="<%=u.getUserName()%>"></p>
<p>密码：<input name="passWord" value="<%=u.getPassWord()%>"></p>
<p>性别：
<input type="radio" <%if(u.getSex().equals("男")){%> checked <%}%> value="男" name="sex">男
<input type="radio" <%if(u.getSex().equals("女")){%> checked <%}%> value="女" name="sex">女
</p>
<p>年龄：<select name="age">
<%for (int i = 18; i < 50; i++) {%>
<option value="<%=i%>"><%=i%></option>
<%}%>
</select>
<script>
for(var i = 0;i<document.getElementsByTagName("option").length;i++){
var option = document.getElementsByTagName("option")[i];
if(option.value == "<%=u.getAge()%>"){
option.selected = true;
}
}
</script>
</p>
<p>
<button type="submit">确认修改</button>
</p>
<a href="userList">用户列表</a>
</form> </body>
</html>
xml.web
<servlet>
<servlet-name>UpdateUser</servlet-name>
<servlet-class>com.david.web.UpdateUser</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>UpdateUser</servlet-name>
<url-pattern>/UpdateUser</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>GetUserById</servlet-name>
<servlet-class>com.david.web.GetUserById</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>GetUserById</servlet-name>
<url-pattern>/GetUserById</url-pattern>
</servlet-mapping>
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