springMVC图片上传的处理方式 springMVC图片上传的处理方式详解
dali_lyc 人气:0想了解springMVC图片上传的处理方式详解的相关内容吗,dali_lyc在本文为您仔细讲解springMVC图片上传的处理方式的相关知识和一些Code实例,欢迎阅读和指正,我们先划重点:springMVC,图片上传,下面大家一起来学习吧。
首先需要依赖的jar包:
<dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>1.3.2</version> </dependency> <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.2.1</version> </dependency>
页面:
<a href="javascript:;" rel="external nofollow" class="a-upload"> <input class="" type="file" name="file" id="file" required="required">上传 </a>
大家如果觉得默认的上传文件的按钮不好看,可以引入下面的css样式:
.a-upload { padding: 4px 10px; height: 27px; line-height: 27px; position: relative; cursor: pointer; color: #888; background: #fafafa; border: 1px solid #ddd; border-radius: 4px; overflow: hidden; } .a-upload input { position: absolute; width: 100%; right: 0; top: 0; opacity: 0; filter: alpha(opacity=0); cursor: pointer } .a-upload:hover { color: #444; background: #eee; border-color: #ccc; text-decoration: none }
前端脚本:
$('#file').on('change', function () { var $this = $(this); var formData = new FormData(); formData.append('file', $('#file')[0].files[0]); var fileName = $('#file')[0].files[0].name; var fileType = fileName.substring(fileName.lastIndexOf('.') + 1); var fileSize = $('#file')[0].files[0].size; if (fileType != 'jpg' && fileType != 'png' && fileType != 'gif') { alert("请上传.jpg、.png、.gif格式的图片!"); return; } if (fileSize > 300 * 1024) { alert("请上传大小小于300KB的图片!"); return; } $.ajax({ url: '/admin/upload', type: 'POST', data: formData, cache: false, processData: false, contentType: false }).done(function (result) { if (result != '') { $this.closest('div').append('<div class="img-preview"><img src="' + result + '"/></div>'); } else { alert("请上传.jpg、.png、.gif格式的图片!"); } }).fail(function () { alert("图片上传失败!"); }); });
后端接收:
@RequestMapping(value = "admin/upload", method = RequestMethod.POST) @ResponseBody public String uploadFile(@RequestParam("file") MultipartFile file) { try { String filename = file.getOriginalFilename(); if (filename.endsWith("jpg") || filename.endsWith("png") || filename.endsWith("gif")) { String prefix = filename.substring(filename.lastIndexOf(".")); String imgName = UUID.randomUUID().toString() + prefix; String imgUri = writeToFileSystem(imgName, file.getBytes()); return imgUri; } } catch (Exception e) { LOG.error("uploadFile failed:", e); } return null; }
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