如何使用java在给定新高度和宽度的情况下更改图像大小？
[英]How to change the size of image with given new height and width using java?
问题描述
This is my demo.jsp page where i have two fields to give new height and width to change the uploaded image size with new one.could anybody tell me how to do this? 
这是我的demo.jsp页面，其中我有两个字段可以提供新的高度和宽度以更改新的高度和宽度。有人可以告诉我该怎么做吗？
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>ImageSizeModification</title>
<script>
function ImageResizer() {
console.log('called');
var srcImg = document.getElementById("imgID").value;
var newImg = new Image();
newImg.src = srcImg;
var height = newImg.height;
var width = newImg.width;
var newWidth = document.getElementById("widthID").value;
var newHeight = document.getElementById("HeightID").value;
console.log(newImg, srcImg, newWidth, newHeight, height, width);
}
</script>
</head>
<body>
<%
out.println("<table>");
out.println("<tr><td><input type='file' id='imgID'></td></tr>");
out.println("<tr><td>Enter new Width:</td><td><input type='text' id='widthID'></td></tr>");
out.println("<tr><td>Enter new Height:</td><td><input type='text' id='HeightID'></td></tr>");
out.println("<tr><td><input type='button' value='Submit' onclick='ImageResizer()'></td></tr>");
out.println("</table>");
%>
</body>
3 个解决方案
解决方案1
0 2014-06-18 12:11:51
If I understand correctly, what you want to do is to resize an image in the browser, so a smaller file goes up to your server. 如果我理解正确，您要做的是在浏览器中调整图像的大小，以便将较小的文件上传到服务器。 If that's so, this is not a Java/JSP question, but a Javascript one. 如果是这样，那么这不是Java / JSP问题，而是Javascript问题。
This post discusses how to do that using javascript libraries, and I think might solve your problem. 这篇文章讨论了如何使用javascript库做到这一点，我认为这可能会解决您的问题。
解决方案2
0 已采纳 2014-06-18 12:16:33
document.getElementById("imgID").style.height = parseInt(newWidth) ;
document.getElementById("imgID").style.width = parseInt(newHeight) ;
add above two line before console log. 在控制台日志之前添加以上两行。
or using Jquery 或使用Jquery
$('#imgID').width(700);
$('#imgID').height(700);
解决方案3
0 2014-06-18 12:23:11
You cannot do it with jsp alone you need to create a servlet get the image through Inputstream manipulate it through any image manipulation api and write it to response. 您不能单独使用jsp来完成它，您需要创建一个servlet，通过Inputstream获取图像，并通过任何图像操作api对其进行操作，然后将其写入响应中。 Imgscalr is an easy to use api. Imgscalr是易于使用的api。 You can refer this link example and clarification 您可以参考此链接示例和说明
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