我是 jsp 新手。我有一个名为 employee 的表，现在我想使用名称作为 request 参数将图像插入到数据存储中。该表已经有 姓名,年龄,id,电话号码,电子邮件,密码 因为 fields.image 是我现在创建的新字段。当使用新的 blob 图像更新图像字段时，它没有显示错误，但图像没有插入。这是我的尝试:
// My form to fileupload
<form name="frm" action="Image.jsp" method="post">
<center>Name:<input type="text" name="name"><br></center><br>
<center><br><br> <input type="submit" value="Submit"></center>
</form>
//(Image.jsp )My pgogram to get file from client and store in database
<%@ page import="java.sql.*" %>
<%@ page import="org.apache.commons.fileupload.*"%>
<%@ page import="org.apache.commons.io.output.*"%>
<%@ page import="org.apache.commons.fileupload.servlet.*"%>
<%@ page import="org.apache.commons.fileupload.disk.*"%>
<%@ page import="java.io.*"%>
<%@ page import="java.util.*"%>
<html>
<body>
<%
Connection connection = null;
String connectionURL = "jdbc:mysql://localhost:3306/praveen";
PreparedStatement pstatement = null;
FileInputStream inputStream = null;
int insertQuery = 0;
byte[] b = null;
Class.forName("com.mysql.jdbc.Driver").newInstance();
connection = DriverManager.getConnection(connectionURL, "root", "bulbultara");
String sql = "update employee set image=? where name=? ";
pstatement = connection.prepareStatement(sql);
pstatement.setString(2, request.getParameter("name"));
DiskFileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload sfu = new ServletFileUpload(factory);
List items = sfu.parseRequest(request);
Iterator iter = items.iterator();
while (iter.hasNext()) {
FileItem item = (FileItem) iter.next();
if (!item.isFormField()) {
b = item.get();
}
}
pstatement.setBytes(1, b);
insertQuery = pstatement.executeUpdate();
pstatement.close();
connection.close();
%>
<a href="Login.jsp"><input type="submit" value="Login"></a>
</body>
</html>
最佳答案
<% @ page import="java.io.*" %>
<% @ page import="java.sql.*" %>
<% @ page import="java.util.zip.* "%>
<%
String saveFile="";
String contentType=request.ContentType();
if((contentType != null) &&(contentType.indexOf("multipart/form-data")>=0))
{
DataInputStream in= new DataInputStream(request.getInputStream());
int formDataLength=request.getContentLength();
byte dataBytes[]= new byte[formDataLength];
int byteread=0;
int totalbyteread=0;
while(totalbyteread<formDataLength)
{
byteread=in.read(dataBytes,totalbyteread,formDataLength);
totalbyteread =byteread+1;
}
String file= new String(dataBytes);
saveFile=file.subString(file.indexOf("filename=\"")+10);
saveFile= saveFile.subString(0,saveFile.indexOf("\n"));
saveFile=saveFile.subString(saveFile.lastIndexOf("\\")+1,saveFile.indexOf("\""));
int lastIndex=contentType.lastIndexOf("=");
String boundry=contentType.subString(lastIndex+1,contentType.length());
int pos;
pos=file.indexOf("filename=\"");
pos=file.indexOf("n\",pos)+1;
pos=file.indexOf("n\",pos)+1;
pos=file.indexOf("n\",pos)+1;
pos=file.indexOf("n\",pos)+1;
int boundrylocation=file.indexOf(boundry,pos)-4;
int startpos=((file.subString(0,pos)).getBytes()).length;
int endpos=((file.subString(0,boundryloction)).getBytes()).length;
File ff= new File(saveFile);
FileOutputStream fileout= new FileOutputStram(ff);
fileout.write(dataBytes,startpos,(endpos-startpos));
fileout.flush();
fileout.close();
%>
<Br><table border="2"><tr><td><b>You have successfully upload the file:</b>
<%out.println(saveFile);%></td></tr></table>
<%
Connection connection = null;
String connectionURL = "jdbc:mysql://localhost:3306/praveen";
PreparedStatement pstatement = null;
FileInputStream inputStream = fis;
ResultSet rs=null;
try
{
Class.forName("com.mysql.jdbc.Driver").newInstance();
connection = DriverManager.getConnection(connectionURL, "root", "bulbultara");
File f= new File(saveFile);
pstatement=connection.prepareStatement("insert into employee(name of image cloumn) values(?)");
pstatement.setBinaryStream(1, (InputStream)fis, (int)(f.length()));
int s = pstatement.executeUpdate();
if(s>0){
System.out.println("Uploaded successfully !");
}
else{
System.out.println("Error!");
}
}
catch(Exception e){e.printStackTrace();}
}
}
%>
关于mysql - 使用 html/jsp 中的文件上传将 blob 图像插入数据库，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/21774726/