大数据接私活200元，做个简易的HDFS浏览器

Posted 2022-06-30 Maynor学长

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大数据接私活200元，做个简易的HDFS浏览器（一）

需求

接到一个单子说是用制作一个简单的HDFS浏览器。

功能包括：基于HDFS的文件浏览、上传和下载。

需求分析

用到的技术包括Java、HDFSAPI、tomcat的配置等

代码实现

项目架构：

Controller层代码：

@Controller
@RequestMapping("/hdfs")
public class hdfsController 
   
   
   
   private hdfsService hdfsService;   
   public hdfsService getHdfsService() 
      return hdfsService;
   
    @Resource
   public void setHdfsService(hdfsService hdfsService) 
      this.hdfsService = hdfsService;
   

   @RequestMapping("/delete")  
    public String toDelete(@RequestParam(value="path",required=false) String path)
       throws IOException  
        hdfsService.delete(path);            
          return "success";       



    @RequestMapping(value="/ls",method=RequestMethod.GET)
       public ModelAndView home(@RequestParam(value="path",required=false) String path, HttpServletRequest request, HttpServletResponse response) 
          throws Exception 
          ModelAndView model = new ModelAndView();
           if (StringUtils.isEmpty(path)) 
               path = "/";
            
         List<hdfsBean> hdfsFiles =hdfsService.ls(path);
           model.addObject("file", hdfsFiles);
           model.setViewName("/ls");
           return model;
       
    
    
    @RequestMapping("/download")  
       public String toDownload(@RequestParam(value="path",required=false) String path)
          throws IOException  
          hdfsService.download(path);           
             return "success";       
   
    
    
    @RequestMapping(value="/upload")
    public String upLoad(HttpServletRequest request, HttpServletResponse response) 
               throws IllegalStateException, IOException
           //解析器解析request的上下文
           CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext()); 
           //先判断request中是否包涵multipart类型的数据，
           if(multipartResolver.isMultipart(request)) 
               //再将request中的数据转化成multipart类型的数据
               MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;
               Iterator<String> iter = multiRequest.getFileNames();
               while(iter.hasNext()) 
                   MultipartFile file = multiRequest.getFile(iter.next());
                   if(file != null) 
                      String FileName = file.getOriginalFilename();
                      System.out.println(FileName);
                       CommonsMultipartFile cf= (CommonsMultipartFile)file; 
                       DiskFileItem fi = (DiskFileItem)cf.getFileItem(); 
                       File inputFile = fi.getStoreLocation();
                       hdfsService.createFile(inputFile, "hdfs://192.168.88.100:8020/upload/"+FileName);
                   
               
           
           return "success";

前端部分页面：

<%@ page language="java" contentType="text/html; charset=UTF-8"
   pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ page isELIgnored="false" %> 
<%String ref = request.getHeader("REFERER");%>  
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>HDFS文件管理器</title>
</head>
<body>
<table>
   <tr>
      <td>文件名</td>
      <td>文件大小  </td>
      <td>拥有者 </td>
      <td>权限  </td>
      <td>时间  </td>
      <td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;操作</td>
   </tr>
     <c:forEach var="file" items="$file">
     <tr>
          <td><a href="$pageContext.request.contextPath/hdfs/ls.do?path=$file.fileName" style="color:#666666;text-decoration:none;">
               $file.fileName</a></td>
          <td> $file.fileSize</td>    
          <td> $file.owner</td>   
          <td> $file.permission</td>  
          <td> $file.modificationTime</td>    
          
          <td><a href="$pageContext.request.contextPath/hdfs/delete.do?path=$file.fileName" style="color:#666666;text-decoration:none;"
           class="button border-dot button-little" onclick="return confirm('确认删除?')" >
                            删除  </a>
          &nbsp;&nbsp;
          <a href="$pageContext.request.contextPath/hdfs/download.do?path=$file.fileName" style="color:#666666;text-decoration:none;">
          下载</a></td>
    </tr>
   </c:forEach>
 <input type="button" value="返回"   onclick="javascript:window.location='<%=ref%>'" >
</table>
</body>
</html>