SSH框架之上传图片到项目文件夹下并在前端显示

SSH框架之上传图片到项目文件夹下并在前端显示

1.前端jsp页面上传代码

  <form action=\"sendMessage.action\"  method=\"post\" enctype=\"multipart/form-data\">
   <label>类别</label>
      <select name=\"category\">
        <option value=\"1\">书籍</option>
        <option value=\"2\">服饰</option>
        <option value=\"3\">证件</option>
        <option value=\"4\">其他</option>
      </select><br>
      <label>描述</label>
      <input type=\"text\" name=\"content\"><br>
      <label>图片</label>
      <input type=\"file\" name=\"upload\"><br>
      <input type=\"submit\" value=\"发布\">
   </form>

2.后台action将上传的图片保存，将保存的图片路径存入数据库

public String send() {
       //保存图片，返回路径
   	String path=messageService.savePhoto(upload);
   	User user=(User) ActionContext.getContext().getSession().get(\"user\");
   	Message message=new Message();
   	message.setMessageUserid(user.getUserId()+\"\");
   	message.setMessagePhoto(\"images/\"+path);
   	message.setMessageCategotyid(1);
   	message.setMessageDe ion(content);
   	message.setMessageDate(new Date());
   	//存入数据库
   	messageService.saveMessage(message);
   	return \"success\";
   }

3.保存图片的方法

public String savePhoto(File upload) {
		// TODO Auto-generated method stub
		//生成随机字符串
		String sources=\"2549hgtflkjadsf89nbvcMNBVCxZwe5989iuytFFJHGfDASwERtrty\";
		Random random=new Random();
		StringBuilder stringBuilder=new StringBuilder();
		for(int i=0;i<5;i++) {
			stringBuilder.append(sources.charAt(random.nextInt(sources.length()))+\"\");
		}
		String str=stringBuilder.toString();
		
		String path=\"D:\\\\JavaWeb\\\\eclipse\\\\workspace\\\\lostandfoundSSH3\\\\WebContent\\\\images\\\\\"+str+\".jpg\";

        //2.保存照片
        File file=new File(path);
        if(!file.exists()){
            try {
                file.createNewFile();
            } catch (IOException e) {
                e.printStackTrace();
                return \"0\";
            }
        }
        if(upload==null) {
        	System.out.println(\"upload is null\");
        }
        if(!file.exists()) {
        	System.out.println(\"file is null\");
        }
        try{
            FileUtils.copyFile(upload,file);
        }catch (IOException e){
            e.printStackTrace();
            return \"0\";
        }
        return str+\".jpg\";
	}

4.通过查询数据库获取图片路径，将路径传给前端，显示图片

 <c:forEach var=\"post\" items=\"${postList}\">
        <div>
           <img class=\"avatar\" alt=\"头像\" src=\"images/myLove.jpg\">
           <label><c:out value=\"${post.getUser().getUserName()}\" /></label><br>
       </div>
     
         <div class=\"content\">  
             <a href=\"#\"><c:out value=\"${post.getMessageDe ion()}\" /></a>
         </div>
         <div>
           <img class=\"content-img\" alt=\"img-content\" src=\"${ post.getMessagePhoto()}\">
         </div>
         <div >
           <a href=\"#\"><img class=\"comment-img\" alt=\"comment\" src=\"images/comment.png\"></a> 
          
         </div>
         <div class=\"date\">
             <c:out value=\"${post.getMessageDate()}\" /><br>
         </div>
         <div class=\"div\"></div>
      </c:forEach>

5.因为图片存储在项目文件下，当上传图片成功后，即使刷新页面前端也不能显示图片，需要刷新一下项目文件，再次刷新web页面才能显示图片