从jsp页面中连接数据库并进行相关操作（增删查改）
2017-04-18 22:07
579 查看
1、在servlet中处理读取数据库中的内容；
2、编写一个java类封装对数据库的加载、连接以及各种查询、更新方法；
3、编写一个javaBean 其参数对应于数据库中的列名
4、servlet中读取数据完成后，交于jsp界面输出
数据库中的数据：
读取的数据：
具体如下：
一：java类，封装对数据库的加载、连接以及各种查询、更新方法；
package Tools;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;
public class Tools {
private static String driver = null;
private static String url = null;
private static String password = null;
private static String user = null;
private Connection con=null;
private Statement state=null;
private PreparedStatement prestate=null;
private ResultSet rs=null;
//加载驱动
static{
try {
driver="com.microsoft.sqlserver.jdbc.SQLServerDriver";
url="jdbc:sqlserver://127.0.0.1:1433;DatabaseName=book";
password="123456";
user="sa";
Class.forName(driver).newInstance();
} catch (Exception e) {
e.printStackTrace();
}
}
//创建连接
public static Connection getConnection(){
try {
return DriverManager.getConnection(url, user, password);
} catch (SQLException e) {
e.printStackTrace();
return null;
}
}
//返回查询结果
public ResultSet getExecuteQuery(String sql) throws SQLException
{
con = Tools.getConnection();
state = con.createStatement();
rs = state.executeQuery(sql);
return rs;
}
//返回执行(update delete add)
public int getExecuteUpdate(String sql) throws SQLException
{
con = Tools.getConnection();
state = con.createStatement();
int num = state.executeUpdate(sql);
return num;
}
//释放资源
public static void release(ResultSet rs,Statement sm, Connection con){
if (rs!=null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
rs=null;
}
if (sm!=null) {
try {
sm.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (con!=null) {
try {
con.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
public void release(){
if (rs!=null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
rs=null;
}
if (state!=null) {
try {
state.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (con!=null) {
try {
con.close();
} catch (SQLException e
f835
) {
e.printStackTrace();
}
}
}
public static void release(ResultSet rs,PreparedStatement psm, Connection con){
if (rs!=null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
rs=null;
}
if (psm!=null) {
try {
psm.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (con!=null) {
try {
con.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
二：javaBean 其参数对应于数据库中的列名package beans;
public class bookbean {
private int id;
private String name;
private float price;
private String author;
private int bookCount;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public float getPrice() {
return price;
}
public void setPrice(float price) {
this.price = price;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public int getBookCount() {
return bookCount;
}
public void setBookCount(int bookCount) {
this.bookCount = bookCount;
}
}
三：开始的一个jsp界面，只有一个功能，实现跳转到servlet处理数据
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>主界面</title>
</head>
<body>
<%
RequestDispatcher rd =request.getRequestDispatcher("Page_go"); //跳转页面
rd.forward(request, response);
%>
</body>
</html>
四：servlet ，给出处理数据的代码
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
List<bookbean> list= GetData("select * from bookStore");
request.setAttribute("list", list);
request.getRequestDispatcher("jdbc.jsp").forward(request, response);;
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
private List<bookbean> GetData(String sql)
{
List<bookbean> list = new ArrayList<bookbean>();
Tools t = new Tools();
try
{
ResultSet rs = t.getExecuteQuery(sql);
while(rs.next())
{
bookbean l = new bookbean();
l.setId(rs.getInt("id"));
l.setAuthor(rs.getString("author"));
l.setBookCount(rs.getInt("bookCount"));
l.setName(rs.getString("name"));
l.setPrice(rs.getFloat("price"));
list.add(l);
}
t.release();
return list;
}catch(Exception e)
{
t.release();
e.printStackTrace();
return null;
}
}
五：最后的输出jsp界面
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@page import ="java.sql.*,beans.*,java.util.*" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<table width="98%" border="0" align="center" cellpadding="0"
cellspacing="1" bgcolor="#666666">
<tr>
<th bgcolor="#FFF000">图书名称</th>
<th bgcolor="#FFF000">价格</th>
<th bgcolor="#FFF000">数量</th>
<th bgcolor="#FFF000">作者</th>
<th bgcolor="#FFF000">修改数量</th>
<th bgcolor="#FFF000">删除</th>
</tr>
<%
//获取图书集合
List<bookbean> list= (List<bookbean>)request.getAttribute("list");
//判断集合是否有效
if(list==null || list.size()<1){
out.print("<tr><td bgcolor='#FFFFF'>没有任何图书信息！</td></tr>");
}
else {
for(bookbean b:list){
%>
<tr align="center">
<td bgcolor="#FFFFFF"><%=b.getName() %></td>
<td bgcolor="#FFFFFF"><%=b.getPrice() %></td>
<td bgcolor="#FFFFFF"><%=b.getBookCount() %></td>
<td bgcolor="#FFFFFF"><%=b.getAuthor() %></td>
<td bgcolor="#FFFFFF"><form action="Update.jsp" method="post" onsubmit="return check(this);">
<input type="hidden" name="id" value="<%=b.getId()%>">
<input type="text" name="bookCount" size="3">
<input type="submit" value="修 改">
</form>
</td>
<td bgcolor="#FFFFFF"><form action="Delete.jsp" method="post" >
<input type="hidden" name="id" value="<%=b.getId()%>">
<input type="submit" value="删 除">
</form>
</td>
</form></td>
</tr>
<%
}
}
%>
</table>
<div width="98%" align="center" style="padding-top:10px;">
</div>
</body>
</html>
2、编写一个java类封装对数据库的加载、连接以及各种查询、更新方法；
3、编写一个javaBean 其参数对应于数据库中的列名
4、servlet中读取数据完成后，交于jsp界面输出
数据库中的数据：
读取的数据：
具体如下：
一：java类，封装对数据库的加载、连接以及各种查询、更新方法；
package Tools;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;
public class Tools {
private static String driver = null;
private static String url = null;
private static String password = null;
private static String user = null;
private Connection con=null;
private Statement state=null;
private PreparedStatement prestate=null;
private ResultSet rs=null;
//加载驱动
static{
try {
driver="com.microsoft.sqlserver.jdbc.SQLServerDriver";
url="jdbc:sqlserver://127.0.0.1:1433;DatabaseName=book";
password="123456";
user="sa";
Class.forName(driver).newInstance();
} catch (Exception e) {
e.printStackTrace();
}
}
//创建连接
public static Connection getConnection(){
try {
return DriverManager.getConnection(url, user, password);
} catch (SQLException e) {
e.printStackTrace();
return null;
}
}
//返回查询结果
public ResultSet getExecuteQuery(String sql) throws SQLException
{
con = Tools.getConnection();
state = con.createStatement();
rs = state.executeQuery(sql);
return rs;
}
//返回执行(update delete add)
public int getExecuteUpdate(String sql) throws SQLException
{
con = Tools.getConnection();
state = con.createStatement();
int num = state.executeUpdate(sql);
return num;
}
//释放资源
public static void release(ResultSet rs,Statement sm, Connection con){
if (rs!=null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
rs=null;
}
if (sm!=null) {
try {
sm.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (con!=null) {
try {
con.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
public void release(){
if (rs!=null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
rs=null;
}
if (state!=null) {
try {
state.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (con!=null) {
try {
con.close();
} catch (SQLException e
f835
) {
e.printStackTrace();
}
}
}
public static void release(ResultSet rs,PreparedStatement psm, Connection con){
if (rs!=null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
rs=null;
}
if (psm!=null) {
try {
psm.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (con!=null) {
try {
con.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
二：javaBean 其参数对应于数据库中的列名package beans;
public class bookbean {
private int id;
private String name;
private float price;
private String author;
private int bookCount;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public float getPrice() {
return price;
}
public void setPrice(float price) {
this.price = price;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public int getBookCount() {
return bookCount;
}
public void setBookCount(int bookCount) {
this.bookCount = bookCount;
}
}
三：开始的一个jsp界面，只有一个功能，实现跳转到servlet处理数据
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>主界面</title>
</head>
<body>
<%
RequestDispatcher rd =request.getRequestDispatcher("Page_go"); //跳转页面
rd.forward(request, response);
%>
</body>
</html>
四：servlet ，给出处理数据的代码
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
List<bookbean> list= GetData("select * from bookStore");
request.setAttribute("list", list);
request.getRequestDispatcher("jdbc.jsp").forward(request, response);;
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
private List<bookbean> GetData(String sql)
{
List<bookbean> list = new ArrayList<bookbean>();
Tools t = new Tools();
try
{
ResultSet rs = t.getExecuteQuery(sql);
while(rs.next())
{
bookbean l = new bookbean();
l.setId(rs.getInt("id"));
l.setAuthor(rs.getString("author"));
l.setBookCount(rs.getInt("bookCount"));
l.setName(rs.getString("name"));
l.setPrice(rs.getFloat("price"));
list.add(l);
}
t.release();
return list;
}catch(Exception e)
{
t.release();
e.printStackTrace();
return null;
}
}
五：最后的输出jsp界面
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@page import ="java.sql.*,beans.*,java.util.*" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<table width="98%" border="0" align="center" cellpadding="0"
cellspacing="1" bgcolor="#666666">
<tr>
<th bgcolor="#FFF000">图书名称</th>
<th bgcolor="#FFF000">价格</th>
<th bgcolor="#FFF000">数量</th>
<th bgcolor="#FFF000">作者</th>
<th bgcolor="#FFF000">修改数量</th>
<th bgcolor="#FFF000">删除</th>
</tr>
<%
//获取图书集合
List<bookbean> list= (List<bookbean>)request.getAttribute("list");
//判断集合是否有效
if(list==null || list.size()<1){
out.print("<tr><td bgcolor='#FFFFF'>没有任何图书信息！</td></tr>");
}
else {
for(bookbean b:list){
%>
<tr align="center">
<td bgcolor="#FFFFFF"><%=b.getName() %></td>
<td bgcolor="#FFFFFF"><%=b.getPrice() %></td>
<td bgcolor="#FFFFFF"><%=b.getBookCount() %></td>
<td bgcolor="#FFFFFF"><%=b.getAuthor() %></td>
<td bgcolor="#FFFFFF"><form action="Update.jsp" method="post" onsubmit="return check(this);">
<input type="hidden" name="id" value="<%=b.getId()%>">
<input type="text" name="bookCount" size="3">
<input type="submit" value="修 改">
</form>
</td>
<td bgcolor="#FFFFFF"><form action="Delete.jsp" method="post" >
<input type="hidden" name="id" value="<%=b.getId()%>">
<input type="submit" value="删 除">
</form>
</td>
</form></td>
</tr>
<%
}
}
%>
</table>
<div width="98%" align="center" style="padding-top:10px;">
</div>
</body>
</html>
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