在jsf中包含jsp会导致输入长度为1的异常
我有以下jsp代码 myDisplayImage.jsp在jsf中包含jsp会导致输入长度为1的异常,jsp,exception,jsf-2,blob,Jsp,Exception,Jsf 2,Blob,我有以下jsp代码 myDisplayImage.jsp 编辑1 我还使用getBinaryStream尝试了新代码,但仍然存在相同的错误。代码是 <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>JSP Page</title&g
编辑1 我还使用
getBinaryStream
尝试了新代码,但仍然存在相同的错误。代码是
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<h1>Hello World!</h1>
<%@ page import="java.sql.*"%>
<%@ page import="java.io.*"%>
<%
Blob image = null;
Connection con = null;
byte[] imgData = null;
Statement stmt = null;
ResultSet rs = null;
try {
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection("jdbc:mysql://localhost:8889/mySacDB", "root", "root");
stmt = con.createStatement();
rs = stmt.executeQuery("select photo from personalInfo where userid = 5");
if (rs.next()) {
String imgLen = rs.getString(1);
System.out.println(imgLen.length());
int len = imgLen.length();
byte[] rb = new byte[len];
InputStream readImg = rs.getBinaryStream(1);
int index = readImg.read(rb, 0, len);
System.out.println("index----------------" + index);
response.reset();
response.setHeader("Content-Length", String.valueOf(len));
String tempString = "image/jpeg";
String tempExtenson = tempString.substring(tempString.lastIndexOf("/") + 1, tempString.length());
response.setHeader("Content-disposition", "inline;filename=/file." + tempExtenson);
response.setContentType(tempString);
response.getOutputStream().write(rb, 0, len);
response.getOutputStream().flush();
}
stmt.close();
// display the image
} catch (Exception e) {
out.println("Unable To Display image<br /><br />");
out.println("Image Display Error=" + e.getMessage());
return;
} finally {
try {
rs.close();
stmt.close();
con.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
%>
</body>
</html>
JSP页面
你好,世界!
您不能在XHTML中包含输出文本以外内容的JSP
问题是JSP将图像的输出与整个请求混合,将内容类型设置为“image/jpeg”
(或在出现错误时输出“text/html”
)。您将无法按原样将其包含在另一个请求中
在您的例子中,您可能只想删除所有HTML标记,让JSP只输出图像。然后,您将能够使用纯HTML正确显示图像,如下所示:
<img src="myDisplayImage.jsp" />
您不能在XHTML中包含输出文本以外内容的JSP 问题是JSP将图像的输出与整个请求混合,将内容类型设置为
“image/jpeg”
(或在出现错误时输出“text/html”
)。您将无法按原样将其包含在另一个请求中
在您的例子中,您可能只想删除所有HTML标记,让JSP只输出图像。然后,您将能够使用纯HTML正确显示图像,如下所示:
<img src="myDisplayImage.jsp" />
< /代码>不应在响应请求的中间更改内容类型。在您的情况下,您希望使此(或其他)JSP文件专用于输出具有适当内容类型的图像。在响应请求时,不应更改内容类型。在您的情况下,您希望将此(或其他)JSP文件专用于输出具有适当内容类型的图像的唯一目的。
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<h1>Hello World!</h1>
<%@ page import="java.sql.*"%>
<%@ page import="java.io.*"%>
<%
Blob image = null;
Connection con = null;
byte[] imgData = null;
Statement stmt = null;
ResultSet rs = null;
try {
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection("jdbc:mysql://localhost:8889/mySacDB", "root", "root");
stmt = con.createStatement();
rs = stmt.executeQuery("select photo from personalInfo where userid = 5");
if (rs.next()) {
String imgLen = rs.getString(1);
System.out.println(imgLen.length());
int len = imgLen.length();
byte[] rb = new byte[len];
InputStream readImg = rs.getBinaryStream(1);
int index = readImg.read(rb, 0, len);
System.out.println("index----------------" + index);
response.reset();
response.setHeader("Content-Length", String.valueOf(len));
String tempString = "image/jpeg";
String tempExtenson = tempString.substring(tempString.lastIndexOf("/") + 1, tempString.length());
response.setHeader("Content-disposition", "inline;filename=/file." + tempExtenson);
response.setContentType(tempString);
response.getOutputStream().write(rb, 0, len);
response.getOutputStream().flush();
}
stmt.close();
// display the image
} catch (Exception e) {
out.println("Unable To Display image<br /><br />");
out.println("Image Display Error=" + e.getMessage());
return;
} finally {
try {
rs.close();
stmt.close();
con.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
%>
</body>
</html>
<img src="myDisplayImage.jsp" />