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springboot(八)--springmvc文件上传、下载 (原创)

作者：朝如青丝暮成雪
发布时间：2018-08-09 10:44:42 文章分类：springboot 阅读(1104) 评论(0)

如题，本篇我们介绍下springmvc文件上传、下载。

一、文件上传

application.properties

#multipart upload 文件上传
#限制一次上传的单个文件的大小
spring.http.multipart.maxFileSize=10Mb
#限制一次上传的所有文件的总大小
spring.http.multipart.maxRequestSize=10Mb

upload.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE html>
<html>
  <head>
    <base href="<%=basePath%>">
    <title>My JSP 'upload.jsp' starting page</title>
    <meta charset="utf-8"/>
  </head>
  <body>
   <form action="${pageContext.request.contextPath }/file_upload" method="post" 
     enctype="multipart/form-data" target="_blank">
    fileType:<input type="text" name="fileType" id="fileType" /> <br/>
    file:<input type="file" name="file" id="file">
    <button type="submit">提交上传</button>
   </form>
   
  </body>
</html>

FileController.java

package com.tingcream.springWeb.controller;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.util.Map;
import java.util.UUID;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;

import com.tingcream.springWeb.util.AjaxUtil;

@Controller
public class FileController {

	/**
	 *  文件上传 
	 * @param fileType 文件类型
	 * @return
	 */
	@ResponseBody
	@RequestMapping("/file_upload")
	public Object  file_upload(String fileType,HttpServletRequest request,HttpServletResponse response){
		
		MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest)request;
		Map<String, MultipartFile> fileMap = multipartRequest.getFileMap();

		MultipartFile mulFile =  fileMap.get("file");
		if(mulFile == null  ||mulFile.getSize()<=0 ){ // -1 
			return AjaxUtil.messageMap(400, "抱歉,上传文件不能为空");
		}
		
		String orgFileName= mulFile.getOriginalFilename();
		long fileSize =mulFile.getSize();
		String name = mulFile.getName();//file input域的参数名  , file 
		System.out.println("文件参数名:"+name);
		System.out.println("原始文件名:"+orgFileName);
		System.out.println("文件大小:"+fileSize);
		
		System.out.println("fileType(业务参数):"+fileType);
		
		String suffix=orgFileName.substring(orgFileName.lastIndexOf("."));//文件后缀
		
		String newFileName = UUID.randomUUID().toString().replaceAll("-", "").toUpperCase()+suffix;
		
		String destPath="f:/13/"+newFileName;
	 
	     try {
			mulFile.transferTo(new File(destPath) );
			return  AjaxUtil.messageMap(200, "上传文件成功","destPath",destPath);
		}  catch (Exception e) {
			e.printStackTrace();
		}
	     return AjaxUtil.messageMap(400, "抱歉,文件上传失败");
		
	}
	
	/**
	 * 文件下载 
	 * @throws Exception
	 */
	@ResponseBody
	@RequestMapping("/file_download")
	public  void  file_download(HttpServletRequest request,HttpServletResponse response) throws Exception{
		
		//String filePath ="f:/13/postman-4.1.2.rar";//ok 
		String filePath ="f:/13/postman-安装包.rar";//中文名称文件 ok
		File file =new File(filePath);
		
		//response.setContentType("");
		response.setHeader("Content-Disposition","filename=" + new String(file.getName().getBytes("gb2312"), "iso8859-1"));
		 
		BufferedInputStream bufin=new BufferedInputStream(new FileInputStream(file));
		int len=0;
		byte[]  buf=new byte[1024*4];
		while( (len=bufin.read(buf))>0){
			response.getOutputStream().write(buf, 0, len);
		}
		bufin.close();
		
	}
	
}

AjaxUtil.java

package com.tingcream.springWeb.util;

import java.util.HashMap;
import java.util.Map;


public class AjaxUtil {
	  //得到一个map
	   public static Map<String,Object> getMap(){
		 return new HashMap<String,Object>();
	   }
	   
	   //返回json数据 状态
	   public static Map<String,Object> messageMap(int status){
		    Map<String,Object>  map=new HashMap<String,Object>();
		    map.put("status", status);
		    	return map; 
		    }
	   //返回json数据 状态、消息
	    public static Map<String,Object> messageMap(int status,String message){
	    	Map<String,Object>  map=new HashMap<String,Object>();
	    	map.put("status", status);
	    	map.put("message", message);
	    	return map;
	    }
	    //返回json数据 状态、消息 和一个参数
	    public  static Map<String,Object> messageMap(int status,String message,
	    		String paramName,Object paramValue){
	    	Map<String,Object>  map=new HashMap<String,Object>();
	    	map.put("status", status);
	    	map.put("message", message);
	    	map.put(paramName, paramValue);
	    	return map;
	    }
	    //返回json数据 状态、消息 和多个参数
	    public static Map<String,Object> messageMap(int status,String message,
	    		String[] paramNames,Object[] paramValues){
	    	Map<String,Object>  map=new HashMap<String,Object>();
	    	map.put("status", status);
	    	map.put("message", message);
	    	if(paramNames!=null&&paramNames.length>0){
	    		for(int i=0;i<paramNames.length;i++){
	        		map.put(paramNames[i], paramValues[i]);
	        	}
	    	}
	    	return map;
	    }
}

二、文件下载

download.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE html>
<html>
  <head>
    <base href="<%=basePath%>">
    <title>My JSP 'download.jsp' starting page</title>
    <meta charset="utf-8"/>
  </head>
  <body>
 
     <a  href="${pageContext.request.contextPath }/file_download">下载文件</a>
   
  </body>
</html>

FileController.java 、AjaxUtil.java 同上(文件上传中的) 。

ok！！！