项目____上传文件

来源：互联网发布：vs2017写c语言编辑：程序博客网时间：2024/05/01 02:39

上传单个文件：

现在使用的方法：

配置struts文件

<span style="white-space:pre"></span><action name="seedUpload" class="com.csValue.basicInfor.wechatManage.web.WechatAction" method='uploadSeed'><interceptor-ref name="defaultStack" /><interceptor-ref name="fileUpload"><param name="allowedTypes">image/png,image/jpg                </param><param name="maximumSize">1048576</param></interceptor-ref><result name="success">/WEB-INF/content/basicInfor/wechatManage/wechat-plants.jsp</result><result name="input">/WEB-INF/content/basicInfor/wechatManage/wechat-plants.jsp</result></action>

jsp内容

<s:form action="seedUpload" id="addForm"  method="post"  theme="simple" enctype="multipart/form-data"><input type="hidden" id="id" name="id" value=""></input>            <table align="center" width="50%" border="1">                 <tr>                     <td>作物编号</td>                     <td><input id="uid" name="uid" readonly></input></td>                 </tr>                                  <tr>                     <td>作物名</td>                     <td><s:textfield id="name" name="name"></s:textfield></td>                 </tr>                                                   <tr>                     <td>种子期图片</td>                     <td >                         <s:file id="seed" name="seed"></s:file>                     </td>                 </tr>                                  <tr>                     <td>发芽期天数</td>                     <td><s:textfield id="sprout_day" name="sprout_day" onkeyup="value=value.replace(/[^\d]/g,'')"></s:textfield></td>                 </tr><tr>                     <td>发芽期图片</td>                     <td >                         <s:file id="sprout" name="sprout"></s:file>                     </td>                 </tr>                                  <tr>                     <td>成长期天数</td>                     <td><s:textfield id="growup_day" name="growup_day" onkeyup="value=value.replace(/[^\d]/g,'')"></s:textfield></td>                 </tr>                                  <tr>                     <td>成长期图片</td>                     <td >                         <s:file id="growup" name="growup"></s:file>                     </td>                 </tr>                                   <tr>                     <td>成熟期天数</td>                     <td><s:textfield id="ripe_day" name="ripe_day" onkeyup="value=value.replace(/[^\d]/g,'')"></s:textfield></td>                 </tr>                                   <tr>                     <td>成熟期图片</td>                     <td >                         <s:file id="ripe" name="ripe"></s:file>                     </td>                 </tr>                                                 <tr>                 <pre name="code" class="html"><span style="white-space:pre"></span><td><s:reset value=" submit"></s:submit></td>

action内容

public String uploadSeed()throws Exception{    System.out.println("调用开始");String imgpath="upload";String img=null;if(seed!=null){InputStream is=new FileInputStream(seed);String path=ServletActionContext.getServletContext().getRealPath("/");img=this.getSeedFileName();File destFile=new File(path+imgpath,img);OutputStream os=new FileOutputStream(destFile);byte[] buffer=new byte[400];int length=0;while((length=is.read(buffer))>0){os.write(buffer,0,length);}this.data.set("seed_img",imgpath+"/"+img);is.close();os.close();}if(sprout!=null){InputStream is=new FileInputStream(sprout);String path=ServletActionContext.getServletContext().getRealPath("/");img=this.getSproutFileName();File destFile=new File(path+imgpath,img);OutputStream os=new FileOutputStream(destFile);byte[] buffer=new byte[400];int length=0;while((length=is.read(buffer))>0){os.write(buffer,0,length);}this.data.set("sprout_img",imgpath+"/"+img);is.close();os.close();}if(growup!=null){InputStream is=new FileInputStream(growup);String path=ServletActionContext.getServletContext().getRealPath("/");img=this.getGrowupFileName();File destFile=new File(path+imgpath,img);OutputStream os=new FileOutputStream(destFile);byte[] buffer=new byte[400];int length=0;while((length=is.read(buffer))>0){os.write(buffer,0,length);}this.data.set("growup_img",imgpath+"/"+img);is.close();os.close();}if(ripe!=null){InputStream is=new FileInputStream(ripe);String path=ServletActionContext.getServletContext().getRealPath("/");img=this.getRipeFileName();File destFile=new File(path+imgpath,img);OutputStream os=new FileOutputStream(destFile);byte[] buffer=new byte[400];int length=0;while((length=is.read(buffer))>0){os.write(buffer,0,length);}this.data.set("ripe_img",imgpath+"/"+img);is.close();os.close();}try{data.set("id", uid);String id_=data.getString("id");System.out.println(id_+"this is try!");if(data.getString("id").isEmpty()){data.set("id", null);}}catch (Exception e){System.out.println("exception!");data.set("id", null);}this.data.set("name", name);this.data.set("sprout_day", sprout_day);this.data.set("growup_day", growup_day);this.data.set("ripe_day", ripe_day);this.wechatManage.uploadPlants(data);this.searchPlants();return "plants";}

经过试验结论：其实不需要重新配置struts中的上传方法。直接在jsp引入file，然后通过button转到相应action处理即可。并且通过此方法可以在提交之前判断对应的文件和字段是否为空。其实都是MVC中的一环。重复了！！

最后注意一下，如果通过button提交，最后不能返回success了！此时的success是返回系统的默认界面，即wechat界面而不是strurs内配置的plants界面了！

_____________________________________________________________________________________________________________________

上传单个文件动态命名后，在名字后面+上上传文件的类型，否则是二进制文件前端打开后乱码内容：

<span style="white-space:pre"></span>BufferedInputStream is2 = new BufferedInputStream(new FileInputStream(imgfile));String mimeType = URLConnection.guessContentTypeFromStream(is2);String[] st = mimeType.split("/");img=time+"."+st[1];

0 0