從數據庫獲取流文件，網頁顯示圖片的方法~~

時間 2020-08-26

標籤數據庫獲取文件網頁顯示圖片方法欄目 SQL 简体版

原文原文鏈接

Search.jsp頁面

<%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<title>Insert title here</title>

</head>

<body>

產品編號：<input type="text" name = "id"></input>

</form>

</body>

</html>

Show.jsp頁面

<%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<title>Insert title here</title>

</head>

<body>

</table>

</body>

</html>

Web.xml配置servlet

<display-name>ProductPhotoShowAction</display-name>

<servlet-name>ProductPhotoShowAction</servlet-name>

<servlet-class>com.city.oa.action.ProductPhotoShowAction</servlet-class>

<init-param>

<param-name>driver</param-name>

<param-value>sun.jdbc.odbc.JdbcOdbcDriver</param-value>

</init-param>

<init-param>

<param-name>url</param-name>

<param-value>jdbc:odbc:DB</param-value>

</init-param>

</servlet>

<servlet-mapping>

<servlet-name>ProductPhotoShowAction</servlet-name>

<url-pattern>/product/showPhoto.do</url-pattern>

</servlet-mapping>

ProductPhotoShowAction類中doPost()方法

String id = request.getParameter("id");

String sql = "select ProductNO,Photo,PhotoType from Product where ProductNO = ?"; //photo爲二進制數據，phototype爲圖片類型

String photoType = "";

String photo = "";

try {

if(!id.trim().equals("")){

PreparedStatement ps = con.prepareStatement(sql);

ps.setInt(1, Integer.parseInt(id));

ResultSet rs = ps.executeQuery();

InputStream in = null;

ServletOutputStream out = null;

if(rs.next()){

photoType = rs.getString("PhotoType");

response.setContentType(photoType);

response.setCharacterEncoding("utf-8");

in = rs.getBinaryStream("Photo");

out = response.getOutputStream();

byte[] data = new byte[200];

int len = 0;

while((len = in.read(data))!=-1){

out.write(data,0,len);

}

in.close();

out.flush();

out.close();

}else

response.sendRedirect("search.jsp");

} catch (Exception e) {

// TODO: handle exception

}

ProductPhotoShowAction類中init（）方法

driver = this.getInitParameter("driver");

url = this.getInitParameter("url");

try {

Class.forName(driver);

con = DriverManager.getConnection(url);

} catch (Exception e) {

// TODO: handle exception

}

ProductPhotoShowAction類中destroy()方法

try {

if(con!=null&&!con.isClosed())

con.close();

} catch (Exception e) {

// TODO: handle exception

}

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