JavaWeb使用實例:用servlet完成oracle 根本增刪改查。本站提示廣大學習愛好者：（JavaWeb使用實例:用servlet完成oracle 根本增刪改查）文章只能為提供參考，不一定能成為您想要的結果。以下是JavaWeb使用實例:用servlet完成oracle 根本增刪改查正文
很久沒有寫博客了，能夠是太懶散，不情願把時間花在這下面，可是我心裡還是知道寫博客的重要性的 ，所以從明天開端 ，我將與大家分享一下我學Java WEB寫的一些小實例 ，我團體是不太喜歡書本上的流暢的概念的，所以我花了更多的時間在一些使用實例上，我覺得這樣的學習方式很合適我，由簡到繁，由淺入深
廢話不多話，開端我們的第一個實例：
servlet完成Oracle 根本增刪改查
開發環境：JDK7 +Myeclipse10+tomcat7.0+oracle 11g
首先附上數據庫創立腳本：
create table student( id VARCHAR2(50) PRIMARY KEY NOT NULL, name varchar2(50) NOT NULL, calssGrent varchar2(50) NOT NULL , result varchar(12) NOT NULL ); insert into student(id,name,calssGrent,result) values(perseq.nextval,'張三','33','98')
下圖為代碼構造圖和功用演示界面做的比擬蹩腳 只為完成功用：
MMC_01.Java
頁面 //主界面提供添加，修正刪除的辦法
package org.lsy.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import oracle.jdbc.oracore.TDSPatch;
public class MMC_01 extends HttpServlet
{
// 驅動順序就是之前在classpath中配置的jdbc的驅動順序的jar包中
// 銜接地址是由各個數據庫消費商獨自提供的，所以需求獨自記住
public static final String DBURL = "jdbc:oracle:thin:@localhost:1521:LIUSY";
// 銜接數據庫的用戶名
public static final String DBUSER = "scott";
// 銜接數據庫的密碼
public static final String DBPASS = "tiger";
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
//設置懇求和呼應的編碼 ，不然頁面上容易呈現亂碼
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
response.setContentType("text/html;UTF-8");
//輸入流
PrintWriter out = response.getWriter();
//數據庫銜接代碼
try
{
Connection conn = null; // 表示數據庫的銜接的對象
Statement stmt = null; // 表示數據庫的更新操作
String sql="insert into student(id,name,calssGrent,result) values('67','劉12宇','33','98')";
System.out.println(sql) ;
// 1、運用Class類加載驅動順序
Class.forName("oracle.jdbc.driver.OracleDriver");
// 2、銜接數據庫
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
// 3、Statement接口需求經過Connection接口停止實例化操作
stmt = conn.createStatement();
//用 rs獲取查詢後果 ，這裡的SQL語句最好不要用* 我的字段比擬少所以就偷一下懶，－，－
ResultSet rs=stmt.executeQuery("select *from student");
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
//輸入表頭局部
out.print("<table align='center' border='1'><tr><td>姓名" +
"</td><td>班級</td><td>成果</td><td>修正</td><td>刪除</td></tr>");
while(rs.next())
{
//獲取數據庫中的ID
String id=rs.getString("id");
//輸入一列元素
out.print("<tr><td>"+rs.getString("name")
+"</td><td>"+rs.getString("calssGrent")+"" +
"</td><td>"+rs.getString("result")+"</td>" +
"<td><a href='UpdatePage?id="+id+"'>修正</a></td>" +
"<td><a href='delete?id="+id+"'> 刪除 </a></td></tr>");
}
out.println("<td><a href=AddPage>添加數據</a></td>");
out.println(" </BODY>");
out.println("</HTML>");
conn.close();
}
catch (Exception e)
{
e.printStackTrace();
}
out.flush();
out.close();
}
}
UpdatePage.java //獲取要修正的數據 ，並把修正過的數據提交給Update
package org.lsy.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.sun.crypto.provider.RSACipher;
public class UpdatePage extends HttpServlet
{
// 銜接地址是由各個數據庫消費商獨自提供的，所以需求獨自記住
public static final String DBURL = "jdbc:oracle:thin:@localhost:1521:LIUSY";
// 銜接數據庫的用戶名
public static final String DBUSER = "scott";
// 銜接數據庫的密碼
public static final String DBPASS = "tiger";
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
String id=request.getParameter("id");
//設置懇求和呼應的編碼 ，不然頁面上容易呈現亂碼
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
response.setContentType("text/html;UTF-8");
PrintWriter out = response.getWriter();
try
{
Connection conn = null; // 表示數據庫的銜接的對象
Statement stmt = null; // 表示數據庫的更新操作
// 1、運用Class類加載驅動順序
Class.forName("oracle.jdbc.driver.OracleDriver");
// 2、銜接數據庫
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
// 3、Statement接口需求經過Connection接口停止實例化操作
stmt = conn.createStatement();
//用 rs獲取查詢後果 ，這裡的SQL語句最好不要用* 我的字段比擬少所以就偷一下懶，－，－
ResultSet rs=stmt.executeQuery("select *from student where id='"+id+"'");
while (rs.next())
{
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
//輸出成果的表單，提交至Update
out.print(" <form action='Update' method='post'> ");
out.print("<table align='center'> <tr><td>姓名：<input type='text' value='"+rs.getString("name")+"'
name='name' size=20 ></td></tr>");
out.print("<tr><td>班級：<input type='text' value='"+rs.getString("calssGrent")+"' name='grent' size=20></td></tr>");
out.print("<tr><td>成果：<input type='text' value='"+rs.getString("result")+"' name='result' size=20></td></tr>");
//為了作為查詢數據庫的條件 ，這裡要把ID傳過來
out.print("<input type='hidden' value='"+id+"' name='id'>");
out.print("<tr><td><input type='submit' value='修正'><input type='reset' value='重置'></td></tr></table></form>");
out.print(" </BODY>");
out.println("</HTML>");
}
out.flush();
out.close();
}
catch (Exception e) {
e.printStackTrace();// TODO: handle exception
}
}
}
Update.java 接納要修正的數據 ，並更新數據庫
package org.lsy.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class Update extends HttpServlet
{
// 驅動順序就是之前在classpath中配置的jdbc的驅動順序的jar包中
// 銜接地址是由各個數據庫消費商獨自提供的，所以需求獨自記住
public static final String DBURL = "jdbc:oracle:thin:@localhost:1521:LIUSY";
// 銜接數據庫的用戶名
public static final String DBUSER = "scott";
// 銜接數據庫的密碼
public static final String DBPASS = "tiger";
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
try
{
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
response.setContentType("text/html;UTF-8");
PrintWriter out = response.getWriter();
Connection conn = null; // 表示數據庫的銜接的對象
Statement stmt = null; // 表示數據庫的更新操作
//獲取表單提交的參數
String id=request.getParameter("id");
System.out.println(id);
String name=request.getParameter("name");
String grent=request.getParameter("grent");
String result=request.getParameter("result");
//更新SQL
String sqlString="update student set name='"+name+"' ," +
"calssGrent='"+grent+"',result='"+result+"' where id='"+id+"' ";
// 1、運用Class類加載驅動順序
Class.forName("oracle.jdbc.driver.OracleDriver");
// 2、銜接數據庫
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
// 3、Statement接口需求經過Connection接口停止實例化操作
stmt = conn.createStatement();
int pd=stmt.executeUpdate(sqlString);
if(pd!=0)
{
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.print(" 更新成功<br><a href=MMC_01>檢查列表</a> ");
out.println(" </BODY>");
out.println("</HTML>");
}
out.flush();
out.close();
stmt.close();
conn.close();
}
catch (Exception e)
{
// TODO: handle exception
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
doGet(request, response);
}
}
addPage .java，添加數據頁面
package org.lsy.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class AddPage extends HttpServlet
{
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
//設置懇求和呼應的編碼 ，不然頁面上容易呈現亂碼
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
response.setContentType("text/html;UTF-8");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
//輸出成果的表單，提交至add
out.print(" <form action='Add' method='post'> ");
out.print("<table align='center'> <tr><td>姓名：<input type='text' name='name' size=20 ></td></tr>");
out.print("<tr><td>班級：<input type='text' name='grent' size=20></td></tr>");
out.print("<tr><td>成果：<input type='text' name='result' size=20></td></tr>");
out.print("<tr><td><input type='submit' value='添加'><input type='reset' value='重置'></td></tr></table></form>");
out.println("<tr><td><a href=MMC_01>檢查列表</a></td></tr>");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
}
add 接納addpage傳來的傳，更新數據庫
package org.lsy.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.sun.org.apache.xerces.internal.impl.io.UTF8Reader;
import oracle.jdbc.oracore.TDSPatch;
public class Add extends HttpServlet
{
// 驅動順序就是之前在classpath中配置的jdbc的驅動順序的jar包中
// 銜接地址是由各個數據庫消費商獨自提供的，所以需求獨自記住
public static final String DBURL = "jdbc:oracle:thin:@localhost:1521:LIUSY";
// 銜接數據庫的用戶名
public static final String DBUSER = "scott";
// 銜接數據庫的密碼
public static final String DBPASS = "tiger";
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException
{
// TODO Auto-generated method stub
doGet(req, resp);
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
//設置懇求和呼應的編碼 ，不然頁面上容易呈現亂碼
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
response.setContentType("text/html;UTF-8");
//輸入流
PrintWriter out = response.getWriter();
//數據庫銜接代碼
try
{
Connection conn = null; // 表示數據庫的銜接的對象
Statement pstmt = null; // 表示數據庫的更新操作
String nameString=request.getParameter("name");
String grentString=request.getParameter("grent");
String resultString=request.getParameter("result");
System.out.print(nameString);
String sql="insert into student(id,name,calssGrent,result)
values(perseq.nextval,'"+nameString+"','"+grentString+"','"+resultString+"')";
// 1、運用Class類加載驅動順序
Class.forName("oracle.jdbc.driver.OracleDriver");
// 2、銜接數據庫
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
pstmt=conn.createStatement();
int pd=pstmt.executeUpdate(sql);
if (pd!=0)
{
out.println("添加成功");
out.println("<br><a href=MMC_01>檢查列表</a>");
}
conn.close();
}
catch (Exception e)
{
e.printStackTrace();
}
out.flush();
out.close();
}
}
web.xml 配置文件
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <display-name></display-name> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <servlet-name>MMC_01</servlet-name> <servlet-class>org.lsy.servlet.MMC_01</servlet-class> </servlet> <servlet> <servlet-name>delete</servlet-name> <servlet-class>org.lsy.servlet.delete</servlet-class> </servlet> <servlet> <servlet-name>Add</servlet-name> <servlet-class>org.lsy.servlet.Add</servlet-class> </servlet> <servlet> <servlet-name>AddPage</servlet-name> <servlet-class>org.lsy.servlet.AddPage</servlet-class> </servlet> <servlet> <servlet-name>UpdatePage</servlet-name> <servlet-class>org.lsy.servlet.UpdatePage</servlet-class> </servlet> <servlet> <servlet-name>Update</servlet-name> <servlet-class>org.lsy.servlet.Update</servlet-class> </servlet> <servlet-mapping> <servlet-name>MMC_01</servlet-name> <url-pattern>/MMC_01</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>delete</servlet-name> <url-pattern>/delete</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>Add</servlet-name> <url-pattern>/Add</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>AddPage</servlet-name> <url-pattern>/AddPage</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>UpdatePage</servlet-name> <url-pattern>/UpdatePage</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>Update</servlet-name> <url-pattern>/Update</url-pattern> </servlet-mapping> </web-app>
自己並非老鳥，不斷處於學習中，有什麼錯誤的中央還請指證，下面的代碼有很多反復的局部，很多不合理的中央 ，比擬數據庫銜接直接暴露於操作servlet中 ，為了看的更直觀 ，我就沒有更改……
以上就是本文的全部內容，希望對大家的學習有所協助，也希望大家多多支持。
