Servlet+JSP开发简单实例

Servlet+JSP开发简单实例

1.数据库Oracle

2.代码

导JAR包：1.jsp-api.jar ; 2.jstl.jar ; 3.ojdbc6.jar ; 4.servlet-api.jar ; 5.standard.jar

​ 2.1实体类domain

package com.userinfos.domain;

import java.util.Date;

public class userinfos {
private int userid;
private String username;
private Date birthday;
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 Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}

}

2.2工具类tools

package com.userinfos.tools;

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

public class DbUtil {
private static final String DRIVER="oracle.jdbc.driver.OracleDriver";
private static final String URL="jdbc:oracle:thin:@127.0.0.1:1521:orcl";
private static final String USERNAME="yangjun";
private static final String PASSWORD="yj";
private static Connection conn;

static{
try {
Class.forName(DRIVER);
conn = DriverManager.getConnection(URL,USERNAME,PASSWORD);
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

private DbUtil(){};

public static Connection getConnection(){
return conn;
}

}

package com.userinfos.tools;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public clas
4000
s DbManager {
private Connection conn;
private PreparedStatement pstat;
private ResultSet rs;

public DbManager(){
conn=DbUtil.getConnection();
}

public int update(String sql,Object[]params){
int count =0;
try {
pstat=conn.prepareStatement(sql);
for (int i = 0; i < params.length; i++) {
pstat.setObject(i+1, params[i]);
}
count = pstat.executeUpdate();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return count;
}

public ResultSet query(String sql,Object[]params){
try {
pstat=conn.prepareStatement(sql);
for (int i = 0; i < params.length; i++) {
pstat.setObject(i+1, params[i]);
}
rs = pstat.executeQuery();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return rs;
}
}

2.3 dao类

package com.userinfos.dao;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;

import com.userinfos.domain.Userinfos;
import com.userinfos.tools.DbManager;

public class UserinfosDAO {
private DbManager dbm;

public UserinfosDAO(){
dbm = new DbManager();
}

public void save(Userinfos user){
String sql = "insert into userinfos values(seq_userid,?,to_date(?,'yyyy-mm-dd'))";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
dbm.update(sql, new Object[]{user.getUsername(), sdf.format(user.getBirthday())});
}

public void delete(int userid){
String sql = "delete from userinfos where userid=?";
dbm.update(sql, new Object[]{userid});
}

public void update(Userinfos user){
String sql = "update userinfos set username=?,birthday=to_date(?, 'yyyy-mm-dd') where userid=?";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
dbm.update(sql, new Object[]{user.getUsername(), sdf.format(user.getBirthday()), user.getUserid()});
}

public Userinfos findUserById(int userid){
String sql = "select * from userinfos where userid=?";
ResultSet rs = dbm.query(sql, new Object[]{userid});
Userinfos user = new Userinfos();
try {
if (rs.next()) {
user.setUserid(rs.getInt("userid"));
user.setUsername(rs.getString("username"));
user.setBirthday(rs.getDate("birthday"));
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return user;
}

public List<Userinfos> findAll(){
String sql = "select * from userinfos";
ResultSet rs = dbm.query(sql, new Object[]{});
List<Userinfos> users = new ArrayList<Userinfos>();
try {
while (rs.next()) {
Userinfos user = new Userinfos();
user.setUserid(rs.getInt("userid"));
user.setUsername(rs.getString("username"));
user.setBirthday(rs.getDate("birthday"));
users.add(user);
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return users;
}
}

2.4服务类services

package com.userinfos.services;

import java.util.List;

import com.userinfos.dao.UserinfosDAO;
import com.userinfos.domain.Userinfos;

public class NormalService {
private UserinfosDAO udao;

public NormalService(){
udao = new UserinfosDAO();
}

public void save(Userinfos user){
udao.save(user);
}

public void delete(int userid){
udao.delete(userid);
}

public void update(Userinfos user){
udao.update(user);
}

public Userinfos findUserById(int userid){
return udao.findUserById(userid);
}

public List<Userinfos> findAll(){
return udao.findAll();
}

public static void main(String[] args) {
NormalService ns = new NormalService();
System.out.println(ns.findUserById(7));
}
}

2.5实现类action，init传入数据至前端

​ 2.5.1删除

package com.test.action;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.test.services.NormalService;

/**
* Servlet implementation class DeleteAction
*/
@WebServlet("/delete")
public class DeleteAction extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
int userid = Integer.parseInt(request.getParameter("userid"));
new NormalService().delete(userid);
response.sendRedirect("init");
}
}

2.5.2新增

package com.test.action;

import java.io.IOException;
import java.text.ParseException;
import java.text.SimpleDateFormat;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.test.domain.Userinfos;
import com.test.services.NormalService;

/**
* Servlet implementation class SaveAction
*/
@WebServlet("/save")
public class SaveAction extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Userinfos user = new Userinfos();
user.setUsername(request.getParameter("username"));
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
try {
user.setBirthday(sdf.parse(request.getParameter("birthday")));
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
new NormalService().save(user);
response.sendRedirect("init");
}
}

2.5.3修改

package com.test.action;

import java.io.IOException;
import java.text.ParseException;
import java.text.SimpleDateFormat;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.test.domain.Userinfos;
import com.test.services.NormalService;

/**
* Servlet implementation class UpdateAction
*/
@WebServlet("/update")
public class UpdateAction extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#doGet(HttpServle
bd00
tRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Userinfos user = new Userinfos();
user.setUserid(Integer.parseInt(request.getParameter("userid")));
user.setUsername(request.getParameter("username"));
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
try {
user.setBirthday(sdf.parse(request.getParameter("birthday")));
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
new NormalService().update(user);
response.sendRedirect("init");
}
}

2.5.4单查

package com.test.action;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.test.services.NormalService;

/**
* Servlet implementation class SingleAction
*/
@WebServlet("/single")
public class SingleAction extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
int userid = Integer.parseInt(request.getParameter("userid"));
request.setAttribute("us", new NormalService().findUserById(userid));
request.getRequestDispatcher("update.jsp").forward(request, response);
}
}

2.5.5全查

package com.test.action;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.test.services.NormalService;

/**
* Servlet implementation class InitAction
*/
@WebServlet("/init")
public class InitAction extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setAttribute("pb", new NormalService().findAll());
request.getRequestDispatcher("index.jsp").forward(request, response);
}
}

3.JSP

3.1初始界面index

<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<table>
<tr>
<td>用户编号</td>
<td>用户姓名</td>
<td>用户生日</td>
<td>修改用户</td>
<td>删除用户</td>
</tr>
<c:forEach items="${pb }" var="us">
<tr>
<td>${us.userid }</td>
<td>${us.username }</td>
<td>${us.birthday }</td>
<td><a href="single?userid=${us.userid }">修改用户</a></td>
<td><a href="delete?userid=${us.userid }">删除用户</a></td>
</tr>
</c:forEach>
</table>
</body>
</html>

3.2新增页面save.jsp

<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<form action="save" method="post">
姓名：<input type="text" name="username" id="username" value="" />
生日：<input type="text" name="birthday" value=""/>
<button>提交</button>
</form>
</body>
</html>

3.3修改页面update.jsp

<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<form action="update" method="post">
<input type="hidden" name="userid" id="userid" value="${us.userid }" />
姓名：<input type="text" name="username" id="username" value="${us.username }" />
生日：<input type="text" name="birthday" value="${us.birthday }"/>
<button>提交</button>
</form>
</body>
</html>