本文主要是介绍spring mvc+xheditor图片上传,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
用户发表文章(Post),在xheditor中写文字和上传图片,交叉进行,图片文件上传到了服务器,图片的名称,url,大小等信息在上传的同时需要单独保存在一张表里。
因此在上一篇的UploadController中除了做上传图片这事之外,还要向Attachment记录图片信息。修改代码如下:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 | @Controller @RequestMapping ( "/upload" ) public class UploadController { private static final Log logger = LogFactory.getLog(UploadController. class ); @Autowired private AttachmentService attachmentService; @RequestMapping (value = "/image" , method = RequestMethod.POST) @ResponseBody public String image(HttpServletRequest request, HttpSession session, @RequestParam ( "filedata" ) MultipartFile file) throws Exception { // 将图片按日期分开存放,方便管理 final String prefix = "upload/images/" + DateUtil.getFormatedDate( "yyyy/MM_dd" ); // 存放到web根目录下,如果日期目录不存在,则创建, // 注意 request.getRealPath("/") 已经标记为不推荐使用了. final String realPath = session.getServletContext().getRealPath(prefix); logger.info(realPath); File dir = new File(realPath); if (!dir.exists()) { dir.mkdirs(); } // 以下是真正的上传部分 String error = "" ; // 取得原文件名 String originName = file.getOriginalFilename(); // 取得文件后缀 String fileExt = originName.substring(originName.lastIndexOf( "." ) + 1 ); // 按时间戳生成图片文件名 String picture = DateUtil.getFormatedDate( "yyyyMMddHHmmss" ) + "." + fileExt; Attachment attachment = new Attachment(); try { IOUtils.copy(file.getInputStream(), new FileOutputStream( new File(dir, picture))); //向attachment表中插入一条post_id为空的图片记录 attachment.setDownloadCount( 0 ); attachment.setSize(( int ) file.getSize()); attachment.setUrl(prefix + "/" + picture); attachment = attachmentService.createAttachment(attachment); } catch (Exception e) { logger.error( "error:" , e); error = e.getMessage(); } String http = "http://" + request.getServerName() + ":" + request.getServerPort() + request.getContextPath(); String url = http + "/" + prefix + "/" + picture; //注意这里的格式(见xheditor文档) //{'err':'',msg:{'url':'XXX/upload/images/2012/11_11/20121111015039.jpg','localname':'我的头像.jpg','id':'63'}} String json = String.format( "{'err':'%s',msg:{'url':'%s','localname':'%s','id':'%s'}}" , error, url, originName, attachment.getId()); return json; } } |
稍微解释一下xheditor json字符串中几个参数的作用::
(1)err:当这个值不为空时,xheditor会在JSP中弹出一个上传失败的对话框并显示err的内容
(2)url: 最终拼凑的可在浏览器中访问的http图片地址,xheditor直接根据这个值在editor中显示图片
(3)localname:这个值不是必须的,一般用来存储图片的名字,是url中的最后部分(也可以不是,比如我url中的图片名字是用时间戳命名的,而这里localname是图片本身的名字)
(4)id:这个值不是必须的,它代表图片在attachment表中的id,回传到JSP,当发表文章做进一步的处理
这张表Attachment和Post是多对一关系,Attachment表中有一个post_id,问题是:保存图片信息的时候, post_id还不存在(用户还没有提交Post呢),
怎么办呢?
我们可以在每次上传时插入一条没有post_id的图片记录,等到用户真正发表文章的时候,批量更新这些attachment的post_id,相关代码如下:
1 2 3 4 5 6 7 8 9 10 11 12 13 | @Override public void updateAttachmentsWithPostId(List<Attachment> attchments, Long postId) { List<Object[]> batchArgs = new ArrayList<Object[]>(); if (attchments != null ) { for (Attachment attachment : attchments) { Object[] args = new Object[] { postId, attachment.getId() }; batchArgs.add(args); } } String sql = "update cms_attachment set post_id = ? where id=?" ; jdbcTemplate.batchUpdate(sql, batchArgs); } |
其间解决了一个@ResponseBody乱码问题(json字符串中的localname为中文时回传到JSP中是乱码)
在这里找到了解决办法:http://www.oschina.net/code/snippet_103691_11482,加入了如下配置:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | <!-- 解决@ResponseBody乱码问题, 需要在annotation-driven之前并且spring版本需要3.1.2以上 --> <!--Spring3.1推荐使用RequestMappingHandlerAdapter --> < bean class = "org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter" > < property name = "messageConverters" > < list > < bean class = "org.springframework.http.converter.ByteArrayHttpMessageConverter" /> < bean class = "org.springframework.http.converter.StringHttpMessageConverter" > < property name = "supportedMediaTypes" > < list > < value >text/plain;charset=UTF-8</ value > </ list > </ property > </ bean > < bean class = "org.springframework.http.converter.ResourceHttpMessageConverter" /> < bean class = "org.springframework.http.converter.xml.SourceHttpMessageConverter" /> < bean class = "org.springframework.http.converter.xml.XmlAwareFormHttpMessageConverter" /> < bean class = "org.springframework.http.converter.xml.Jaxb2RootElementHttpMessageConverter" /> </ list > </ property > </ bean > |
我们可以从spring日志中看出加这个配置的作用
加之前
[DEBUG] Written [{'err':'',msg:
{'url':'http://localhost:9080/spring/upload/images/2012/11_11/20121111011413.jpg','localname':'我的头
像.jpg','id':'50'}}] as "text/html" using
[org.springframework.http.converter.StringHttpMessageConverter@93d9c7]
加之后:
[DEBUG] Written [{'err':'',msg:{'url':'http://localhost:9080/spring/upload/images/2012/11_11/20121111015039.jpg','localname':'我的头像.jpg','id':'63'}}] as "text/plain;charset=UTF-8" using [org.springframework.http.converter.StringHttpMessageConverter@1fdec30]
前台部分,相关的JS如下:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 | <script type= "text/javascript" > //图片预览 function previewImage(x){ $( '#preview' ).attr( "src" , "${ctx}/" + $(x).find( "option:selected" ).val()); } $(document).ready( function () { //初始化xhEditor编辑器插件 $( '#content' ).xheditor({ tools : 'full' , skin : 'default' , upImgUrl : "${ctx}/upload/image" , upImgExt : "jpg,jpeg,png,gif" , html5Upload : false , onUpload : insertUpload }); //图片上传回调函数 function insertUpload(arrMsg) { //xheditor返回的arrMsg是一个Object数组 var msg = arrMsg[0]; //(1)其中url插入到编辑器,这样xheditor才能正常显示图片 var url = msg.url; $( "#content" ).append(url); //以下步骤不是必须的 //(2)将attachment_id保存到checkbox中,发表文章时根据这些attachment_id去更新图片的post_id var id = msg.id; $( "#imagesDiv" ).append( "<input type='checkbox' name='attachments' checked='checked' onclick='return false;' value='" +id+ "''/><br>" ); //(3)图片的名字放到下拉列表,用户从下拉列表 中选择图片做为Post的主题图片 var localname = msg.localname; var urlWithoutHttp = url.substring(url.indexOf( "/upload" )+1); $( "#topicImageUrl" ).append( "<option value='" +urlWithoutHttp+ "'>" + localname + "</option>" ); } //聚焦第一个输入框 $( "#name" ).focus(); //为inputForm注册validate函数 $( "#inputForm" ).validate(); }); </script> |
相关的form表单元素如下:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | < div class = "control-group" > < label class = "control-label" for = "content" >内容:</ label > < div class = "controls" > < sf:textarea path = "content" rows = "15" cssClass = "span10" /> </ div > < div class = "controls" id = "imagesDiv" style = "display:none" > </ div > </ div > < div class = "control-group" > < label class = "control-label" for = "topicImageUrl" >主题图片:</ label > < div class = "controls" > < sf:select path = "topicImageUrl" onchange = 'previewImage(this)' > < sf:option value = "" >Please select</ sf:option > </ sf:select > </ div > </ div > < div class = "control-group" > < label class = "control-label" for = "hit" >图片预览:</ label > < div class = "controls" > < img id = "preview" src = "" border = "0" width = "200" height = "200" /> </ div > </ div > |
最终的效果如下:
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