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从数据库中读出图片并显示的示例代码 < !-- -- -- --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/*";
/**
* 定义数据库连接字符串，JDBC.odbc桥
*/
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;
/********************************************
* 定义应用变量
******************************************/
private String SQLString = ""; //定义查询语句//r
public String M_EorrMenage = ""; //定义错误信息变量
private InputStream in = null; //定义输入流//r
private int len = 10 * 1024 * 1024; //定义字符数组长度 //Initialize global variables
public void init() throws ServletException {
/**
* 连接数据库//r
*/
try {
Class.forName(driver_class);
} catch (java.lang.ClassNotFoundException e) {
//异常
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();
//在数据库中的照片的ID
int PHOTOID = 0;
/*********************************************
* 接受上文传递的图片ID号
* 上文传输文件名称为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 = "请输入图片ID号";
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>"); }
/*****************************************************
* 执行查询语句//r
*****************************************************/
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