文件上传与处理-优快云博客

本文链接：https://blog.youkuaiyun.com/iteye_9521/article/details/82578758

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 
<html> 
<head> 
    <base href="<%=basePath%>"> 
    
    <title>My JSP 'upload.jsp' starting page</title> 
    
    <script type="text/javascript"> 
        function AddMore(){ 
            var more = document.getElementById("file"); 
            var br = document.createElement("br"); 
            var input = document.createElement("input"); 
            var button = document.createElement("input"); 
            
            input.type = "file"; 
            input.name = "file"; 
            
            button.type = "button"; 
            button.value = "删除"; 
            
            more.appendChild(br); 
            more.appendChild(input); 
            more.appendChild(button); 
            
            button.onclick = function(){ 
                more.removeChild(br); 
                more.removeChild(input); 
                more.removeChild(button); 
            }; 
        } 
    </script> 
</head> 

<body> 
    <s:form action="upload" method="post" theme="simple" enctype="multipart/form-data"> 
    <table border="1" width="50%"> 
        <tr> 
            <td>用户名:</td> 
            <td><s:textfield name="username" label="用户名"></s:textfield></td> 
        </tr> 
        <tr> 
            <td>附件:</td> 
            <td id="file"> 
            <s:file name="file" label="文件"></s:file> 
            <input type="button" value="增加附件" onclick="AddMore()"> 
            </td> 
        </tr> 
        <tr> 
            <td colspan="2" align="center"> 
            <s:submit value="提交" ></s:submit></td> 
        </tr> 
    </table>    
    </s:form> 
</body> 
</html>

编辑页面遍历显示：

<c:forEach var="i" items="${oaAnnexs}" >
				<a href="<%=url%>${i.filePath }">${i.fileName}</a><input type="hidden"  value="${i.id }"/> <input type="button" value="删除" onclick="delFile('${i.id }')"/> <br>
	 		</c:forEach>

底层代码：

package com.sinosoft.oa.base.service.impl;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.lang.StringUtils;
import org.springframework.util.FileCopyUtils;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;

/**
 * 
 * @author bmj
 * @date 2014-4-30
 */
public class FileOperateUtil {
	private static final String REALNAME = "realName";
	private static final String STORENAME = "storeName";
	private static final String SIZE = "size";
	private static final String SUFFIX = "suffix";
	private static final String CONTENTTYPE = "contentType";
	private static final String CREATETIME = "createTime";
	private static final String UPLOADDIR = "uploadDir/";

	/**
	 * 将上传的文件进行重命名
	 * 
	 * @author lds
	 * @date 2014-4-30
	 * @param name
	 * @return
	 */
	private static String rename(String name) {

		Long now = Long.parseLong(new SimpleDateFormat("yyyyMMddHHmmss")
				.format(new Date()));
		Long random = (long) (Math.random() * now);
		String fileName = now + "" + random;

		if (name.indexOf(".") != -1) {
			fileName += name.substring(name.lastIndexOf("."));
		}

		return fileName;
	}

	/**
	 * 上传文件
	 * 
	 * @author lds
	 * @date 2014-4-30
	 * @param request
	 * @param params
	 * @param values
	 * @return
	 * @throws Exception
	 */
	public static List<Map<String, Object>> upload(HttpServletRequest request,
			String[] params, Map<String, Object[]> values) throws Exception {

		List<Map<String, Object>> result = new ArrayList<Map<String, Object>>();

		MultipartHttpServletRequest mRequest = (MultipartHttpServletRequest) request;
		Map<String, MultipartFile> fileMap = mRequest.getFileMap();

		String uploadDir = request.getSession().getServletContext()
				.getRealPath("/")
				+ FileOperateUtil.UPLOADDIR;
		File file = new File(uploadDir);

		if (!file.exists()) {
			file.mkdir();
		}

		String fileName = null;
		int i = 0;
		for (Iterator<Map.Entry<String, MultipartFile>> it = fileMap.entrySet()
				.iterator(); it.hasNext(); i++) {

			Map.Entry<String, MultipartFile> entry = it.next();
			MultipartFile mFile = entry.getValue();

			fileName = mFile.getOriginalFilename();

			String storeName = rename(fileName);
			//fileName去掉后缀
			if(!StringUtils.isBlank(fileName)){
				fileName = fileName.substring(0,fileName.lastIndexOf("."));
			}
			File file2 = new File(uploadDir+storeName);
			//上传
			FileCopyUtils.copy(mFile.getBytes(), file2);	
			Map<String, Object> map = new HashMap<String, Object>();
			map.put(mFile.getOriginalFilename(), storeName);
			result.add(map);
			
		}
		return result;
	}

	/**
	 * 下载
	 * 
	 * @author lds
	 * @date 2014-4-30 
	 * @param request
	 * @param response
	 * @param storeName
	 * @param contentType
	 * @param realName
	 * @throws Exception
	 */
	public static void download(HttpServletRequest request,
			HttpServletResponse response, String storeName, String contentType,
			String realName) throws Exception {
		response.setContentType("text/html;charset=UTF-8");
		request.setCharacterEncoding("UTF-8");
		BufferedInputStream bis = null;
		BufferedOutputStream bos = null;

		String ctxPath = request.getSession().getServletContext()
				.getRealPath("/")
				+ FileOperateUtil.UPLOADDIR;
		String downLoadPath = ctxPath + storeName;

		long fileLength = new File(downLoadPath).length();

		response.setContentType(contentType);
		response.setHeader("Content-disposition", "attachment; filename="
				+ new String(realName.getBytes("utf-8"), "ISO8859-1"));
		response.setHeader("Content-Length", String.valueOf(fileLength));

		bis = new BufferedInputStream(new FileInputStream(downLoadPath));
		bos = new BufferedOutputStream(response.getOutputStream());
		byte[] buff = new byte[2048];
		int bytesRead;
		while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
			bos.write(buff, 0, bytesRead);
		}
		bis.close();
		bos.close();
	}
}

多附件上传