CODE:
< !-- -- -- -- -- -- -- -- -- -- -- -- -- --servlet-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -->
package Photo;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import java.lang.*;
import java.sql.*;
/**
* <p>Title: </p>
* <p>Description: </p>
* <p>Copyright: Copyright (c) 2002</p>
* <p>Company: </p>
* @author unascribed
* @version 1.0
*/
public class ShowImage extends HttpServlet {
private static final String CONTENT_TYPE = "image/*";
/**
* 定義數(shù)據(jù)庫(kù)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(yīng)用變量
******************************************/
private String SQLString = ""; //定義查詢(xún)語(yǔ)句
public String M_EorrMenage = ""; //定義錯(cuò)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(shù)組長(zhǎng)度
//Initialize global variables
public void init() throws ServletException {
/**
* 連接數(shù)據(jù)庫(kù)
*/
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(shù)據(jù)庫(kù)中的照片的ID
int PHOTOID = 0;
/*********************************************
* 接受上文傳遞的圖片ID號(hào)
* 上文傳輸文件名稱(chēng)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(qǐng)輸入圖片ID號(hào)";
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("<p>" + M_EorrMenage + "</p>");
out.println("</body></html>");
}
/*****************************************************
* 執(zhí)行查詢(xún)語(yǔ)句
*****************************************************/
try {
conn = DriverManager.getConnection(connect_string);
stmt = conn.createStatement();
rs = stmt.executeQuery(SQLString);
} //try
catch (SQLException ex) {
System.err.println("aq.executeUpdate:" + ex.getMessage());
M_EorrMenage = "對(duì)不起，數(shù)據(jù)庫(kù)無(wú)法完成此操作！";
M_EorrMenage =
new String(M_EorrMenage.getBytes("ISO8859_1"), "GBK");
response.setContentType("text/html; charset=gb2312");
out.println("<html>");
out.println("<head><title>no_database</title></head>");
out.println("<body>");
out.println("<p>" + M_EorrMenage + "</p>");
out.println("</body></html>");
}
/*********************************************
* 將圖片流讀入字符數(shù)組中，并顯示到客戶(hù)端
********************************************/
try {
if (rs.next()) {
in = rs.getBinaryStream("photo");
response.reset(); //返回在流中被標(biāo)記過(guò)的位置
response.setContentType("image/jpg"); //或gif等
// int len=in.available();//得到文件大小
OutputStream toClient = response.getOutputStream();
byte[] P_Buf = new byte[len];
int i;
while ((i = in.read(P_Buf)) != -1) {
toClient.write(P_Buf, 0, i);
}
in.close();
toClient.flush(); //強(qiáng)制清出緩沖區(qū)
toClient.close();
} else {
M_EorrMenage = "無(wú)此圖片！";
M_EorrMenage =
new String(M_EorrMenage.getBytes("ISO8859_1"), "GBK");
response.setContentType("text/html; charset=gb2312");
out.println("<html>");
out.println(
"<head><title>this photo isn‘t have</title></head>");
out.println("<body>");
out.println("<p>" + M_EorrMenage + "</p>");
out.println("</body></html>");
}
rs.close();
} catch (Exception e) {
e.printStackTrace();
M_EorrMenage = "無(wú)法讀取圖片！";
M_EorrMenage =
new String(M_EorrMenage.getBytes("ISO8859_1"), "GBK");
response.setContentType("text/html; charset=gb2312");
out.println("<%@ page contentType=‘text/html; charset=gb2312‘ %>");
out.println("<html>");
out.println("<head><title>no photo</title></head>");
out.println("<body>");
out.println("<p>" + M_EorrMenage + "</p>");
out.println("</body></html>");
}
}
//Clean up resources
public void destroy() {
try {
conn.close();
} catch (SQLException e) {
System.err.println("aq.executeUpdate:" + e.getMessage());
M_EorrMenage = "對(duì)不起，數(shù)據(jù)庫(kù)無(wú)法完成此操作！";
}
}
}
<!---------------------------顯示---------------------------------------------->
<html>
<head>
<title>Untitled Document</title>
</head>
<body bgcolor="#FFFFFF" text="#000000">
<table>
<%
int i=1;
while(i<3){
%>
<tr>
<td colspan="3"> <img border="1" src="http://192.168.1.50:8100/ShowImage?photoid=<%=i%>"></td>
</tr>
<%
i++;
}
%>
</table>
</body>
</html>
注：此程序?qū)τ趶臄?shù)據(jù)庫(kù)讀取圖片后寫(xiě)入文件請(qǐng)參考代碼者留意 |
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文章回復(fù)：
Re:從數(shù)據(jù)庫(kù)中讀出圖片并顯示的示例代碼作者：Cable Fan 發(fā)表于：2005-10-11 20:33
通過(guò)Email跟作者聯(lián)系謝謝作者,作者只是想講解一個(gè)技術(shù),并不是論方法好壞.
Re:從數(shù)據(jù)庫(kù)中讀出圖片并顯示的示例代碼作者：青菜蟲(chóng) 發(fā)表于：2005-05-24 08:40
通過(guò)Email跟作者聯(lián)系我想如果是存入地址的話(huà)，是不是不是在本地上傳的圖片會(huì)訪(fǎng)問(wèn)不到啊。還有，我怎么沒(méi)有看明白怎么樣從網(wǎng)頁(yè)中顯示出來(lái)的啊。
Re:從數(shù)據(jù)庫(kù)中讀出圖片并顯示的示例代碼作者：tony 發(fā)表于：2005-02-16 16:00
通過(guò)Email跟作者聯(lián)系我和Demon 有同樣的疑問(wèn)----為什么把圖片直接放到數(shù)據(jù)庫(kù)中？為什么不存入地址，然后從數(shù)據(jù)庫(kù)讀出圖片地址就好?。?br>
Re:從數(shù)據(jù)庫(kù)中讀出圖片并顯示的示例代碼作者：David 發(fā)表于：2004-12-16 19:59
通過(guò)Email跟作者聯(lián)系發(fā)自?xún)?nèi)說(shuō)一句 THANK YOU VERY MUCH!!
感謝您的幫助?。?br>
Re:從數(shù)據(jù)庫(kù)中讀出圖片并顯示的示例代碼作者：Demon 發(fā)表于：2004-08-14 16:14
通過(guò)Email跟作者聯(lián)系為什么把圖片直接放到數(shù)據(jù)庫(kù)中？為什么不存入地址，然后從數(shù)據(jù)庫(kù)讀出圖片地址就好??！
