Question

我正在尝试在mysql数据库中插入图像＆amp;检索它并显示另一个jsp页面但是在浏览器中重新显示它不显示图像而不是它开始下载你可以帮助我。。，我的代码是。，

Addimage.jsp。

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org       /TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form action="AddImg.jsp" method="post">
Image<input type="file" name="file" value="upload" /><br>
<input type="submit" value="Add"/>
</form>
</body>
</html>`

和AddImg.jsp

<%@page import="java.sql.*" %>
<%@page import="java.io.*" %>
<%
Connection con;
PreparedStatement stmt;
ResultSet rs;
byte[] b=null;
//int f;

%>
  <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
 pageEncoding="ISO-8859-1"%>
     <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org                 /TR/html4/loose.dtd">
     <%
  String filenm=request.getParameter("file");

String f="C:/visualverify02/limitedimages/"+filenm;
File file=new File(f);
FileInputStream fin =new FileInputStream(file);

Class.forName("com.mysql.jdbc.Driver");
con=DriverManager.getConnection("jdbc:mysql://localhost:3306/imgdb","root","password");
stmt=con.prepareStatement("insert into img values(?)");
//String str="insert into img values ('"+file2+"')";
stmt.setBinaryStream(1,(InputStream) fin, (int) (file.length()));
int count=stmt.executeUpdate();
%>

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<%
if(count>0)
{
out.println("img inserted");
rs = stmt.executeQuery("SELECT * FROM img ");
int i = 1;
if(rs.next()) {
    Blob len1 = rs.getBlob("imgfile");
    //int len = (int)len1.length();
     b = len1.getBytes(1,(int)len1.length());

    }else{out.println("Img not selected");}



    response.setContentType("image/jpg");
    OutputStream o=response.getOutputStream();

%>
<table>
<tr><td><%o.write(b); %></td></tr>
<%

o.flush();
o.close();

}


else{
out.println("Not inserted");
}
%>
</table>
</body>
</html>

Answer 1

首先，我认为在你的jsp中使用scriptlet是不好的做法。我建议使用至少一个http servlet作为控制器来处理存储图像。

其次，编写代码的方式不是将图像写入html页面，而是写入文件，这将触发下载该文件。要执行您要归档的内容，您的内容类型应为“text / html”，输出应为带有how to show byte data in an img tag

中描述的图像标记的html

从mysql在jsp中显示img

1 个答案: