JDBCServlet的小程序

最新推荐文章于 2022-11-20 21:17:57 发布

原创最新推荐文章于 2022-11-20 21:17:57 发布 · 51 阅读

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CC 4.0 BY-SA版权

文章标签：

#DB2 #Servlet #Java #SQL #JDBC

本文介绍了一个使用JDBC从数据库检索数据并将其显示在HTML表格中的Servlet示例。该示例展示了如何通过Java连接DB2数据库，并执行SQL查询来获取医疗相关信息。

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JDBCServlet.java


package com.zyl.servlet;

import javax.servlet.*;
import javax.servlet.http.*;

import java.io.*;
import java.sql.*;

public class JDBCServlet extends HttpServlet {

	@Override
	protected void doGet(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {

		Connection conn = null;
		Statement stmt = null;
		ResultSet rs = null;

		response.setContentType("text/html");
		response.setCharacterEncoding("UTF-8");
		PrintWriter out = response.getWriter();

		out.println("<table border=1>");
		out.println("<tr><td>categoryno:</td>" +
				"<td>medicalid:</td>" +
				"<td>medicaltitle:</td></tr>");
		try {
			Class.forName("com.ibm.db2.jcc.DB2Driver");
			conn = DriverManager.getConnection(
					"jdbc:db2://192.168.25.230:50000/JSAMPLE", "zyl", "123");
			stmt = conn.createStatement();
			rs = stmt.executeQuery("select categoryno,medicalid,medicaltitle from medicalbean"); 
			while(rs.next()){
				out.println("<tr>");
				out.println("<td>" + rs.getString("categoryno") + "</td>");
				out.println("<td>" + rs.getString("medicalid") + "</td>");
				out.println("<td>" + rs.getString("medicaltitle") + "</td>");
				out.println("</tr>");
			}
			out.println("</table>");
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			try {
				if(rs != null) {
					rs.close();
					rs = null;
				}
				if(stmt != null) {
					stmt.close();
					stmt= null;
				}
				if(conn != null) {
					conn.close();
					conn = null;
				}
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
	}

}

web.xml配置


<servlet>
<servlet-name>RS</servlet-name>
<servlet-class>com.zyl.servlet.JDBCServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>RS</servlet-name>
<url-pattern>/SR</url-pattern>
</servlet-mapping>