從數據庫中讀出圖片并顯示的示例代碼

2019-11-18 15:06:53

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!-- -- -- -- -- -- -- -- -- -- -- -- -- --servlet-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -->package Photo;import javax.servlet.*;import javax.servlet.http.*;import java.io.*;import java.util.*;import java.lang.*;import java.sql.*;/*** Title: * Description: * Copyright: Copyright (c) 2002* Company: * @author unascribed* @version 1.0*/public class ShowImage extends HttpServlet { PRivate static final String CONTENT_TYPE = "image/*"; /** * 定義數據庫連接字符串，jdbc.odbc橋 */ private String driver_class = "Oracle.jdbc.driver.OracleDriver"; private String connect_string = "jdbc:oracle:thin:xxw/xxw@192.168.1.50:1521:ORCL"; Connection conn = null; ResultSet rs = null; Statement stmt = null; /******************************************** * 定義應用變量 ******************************************/ private String SQLString = ""; //定義查詢語句 public String M_EorrMenage = ""; //定義錯誤信息變量 private InputStream in = null; //定義輸入流 private int len = 10 * 1024 * 1024; //定義字符數組長度 //Initialize global variables public void init() throws ServletException { /** * 連接數據庫 */ try { Class.forName(driver_class); } catch (java.lang.ClassNotFoundException e) { //異常 System.err.println("databean():" + e.getMessage()); } } //Process the HTTP Get request public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType(CONTENT_TYPE); PrintWriter out = response.getWriter(); //在數據庫中的照片的ID int PHOTOID = 0; /********************************************* * 接受上文傳遞的圖片ID號 * 上文傳輸文件名稱為photoid *********************************************/ try { PHOTOID = Integer.parseInt(request.getParameter("photoid")); SQLString = "select * from xxw_photo where p_id=" + PHOTOID; } catch (Exception e) { e.printStackTrace(); response.setContentType("text/Html; charset=gb2312"); M_EorrMenage = "請輸入圖片ID號"; M_EorrMenage = new String(M_EorrMenage.getBytes("ISO8859_1"), "GBK"); out.println("<%@ page contentType=´text/html; charset=gb2312´ %>"); out.println("<html>"); out.println("<head><title>id</title></head>"); out.println("<body>"); out.println("" + M_EorrMenage + ""); out.println("</body></html>"); } /***************************************************** * 執行查詢語句

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