Spring MVC 实现文件上传与下载

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Spring MVC 实现文件上传与下载

1、spring-mvc.xml配置:

</property>

</property>

</property>

</bean>

2 、引入相关jar包：commons-fileupload.jar、commons-io-1.4.jar和spring相关jar包
3 表单属性为：enctype="multipart/form-data"
4、实现代码

import org.springframework.web.multipart.MultipartFile;

/**

* 文件上传实体类

* @author ***

* 这里不将图片信息存入数据库

public class FileUpload {

private String id;

private String fileName;

private String filePath;

private MultipartFile csvFile;

// getter方法和setter方法省略

}

/**

* 文件上传下载控制层

* @author ***

@Controller

@RequestMapping("/fileController")

public class FileController {

/**

* 文件上传

* @author ***

@RequestMapping("/upload")

@ResponseBody

public Json upload(FileUpload file, HttpServletRequest request) {

Json json = new Json();

try {

FileUploadUtil.uploadFile(file.getCsvFile(), request);

String fileName = file.getCsvFile().getOriginalFilename();

String suffix = fileName.substring(fileName.lastIndexOf("."));

if (".csv".indexOf(suffix.toLowerCase()) != -1) {

json.setSuccess(true);

json.setMsg("文件上传成功。");

} else {

json.setSuccess(false);

json.setMsg("上传的文件格式不支持！");

}

} catch (Exception e) {

json.setMsg(e.getMessage());

}

return json;

}

/**

* 文件下载

* @author ***

@RequestMapping("/download")

public void download(HttpServletRequest request,HttpServletResponse response) {

String fileName = "部门管理.xls";

String filePath = request.getSession().getServletContext()

.getRealPath("/") + "\\download" + fileName ;

try {

FileDownloadUtil.modelDownload(fileName, filePath, response);

} catch (Exception e) {

e.printStackTrace();

}

import java.io.File;

import java.io.IOException;

import java.text.DateFormat;

import java.text.SimpleDateFormat;

import java.util.Date;

import javax.servlet.http.HttpServletRequest;

import org.springframework.util.FileCopyUtils;

import org.springframework.web.multipart.MultipartFile;

import com.common.model.FileUpload;

/**

* 文件上传通用类

* @author ***

public class FileUploadUtil {

public static void uploadFile(MultipartFile file, HttpServletRequest request) throws Exception {

if (!file.isEmpty() && file.getSize() > 0) {

try {

String fileName = file.getOriginalFilename();

String suffix = fileName.substring(fileName.lastIndexOf("."));// 后缀名

String newFileName = fileName.substring(0, fileName.lastIndexOf(".")) + "_" + dateTime() + suffix;

if ((".csv".indexOf(suffix.toLowerCase()) != -1)) {

byte[] bytes = file.getBytes();

Integer fileSize = (int) file.getSize() / 1024;

if (fileSize <= 10240) {

File dir = new File(request.getSession().getServletContext().getRealPath("/upload"));

if (!dir.exists()) {

dir.mkdirs();

}

File filePath = new File(request.getSession().getServletContext().getRealPath("/upload") + newFileName));

FileCopyUtils.copy(bytes, filePath);

} else {

throw new RuntimeException("上传的文件太大，文件大小不能超过10M！");

}

} else {

throw new RuntimeException("上传的文件格式不支持！");

}

} catch (IOException e) {

throw new RuntimeException(e.getMessage());

}

// 获得文件路径，包含到文件名

public static String getFilePath(FileUpload file, HttpServletRequest request) {

String fileName = file.getCsvFile().getOriginalFilename();

String suffix = fileName.substring(fileName.lastIndexOf("."));// 后缀名

String newFileName = fileName.substring(0, fileName.lastIndexOf(".")) + "_" + dateTime() + suffix;

File filePath = new File(request.getSession().getServletContext().getRealPath(ConfigUtil.getUploadbundle().getString("csvFilePath") + newFileName));

return filePath.toString();

}

// 获取时间

public static String dateTime() {

DateFormat df = new SimpleDateFormat("yyyyMMdd_HHmm");

String date = df.format(new Date());

return date;

}

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import javax.servlet.http.HttpServletResponse;

public class FileDownloadUtil {

/**

* <p>文件下载工具方法</p>

* @param fileName

* @param downloadPath

* @param response

* @throws Exception

public static void modelDownload(String fileName, String downloadPath, HttpServletResponse response) throws Exception{

BufferedInputStream bis = null;

BufferedOutputStream bos = null;

try {

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

response.setContentType("application/x-msdownload;");

response.setHeader("Content-disposition", "attachment; filename=" + new String(fileName.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[1024];

int bytesRead;

while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {

bos.write(buff, 0, bytesRead);

}

} catch (IOException e) {

e.printStackTrace();

} finally {

if (bis != null){

bis.close();

}

if (bos != null){

bos.close();

}

Jsp文件：

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>

$(function(){

parent.$.messager.progress('close');

$('#form').form({

url: '${pageContext.request.contextPath}/fileController/upload',

onSubmit : function() {

parent.$.messager.progress({

title : '提示',

text : '数据处理中，请稍后....'

});

success : function(result) {

result = $.parseJSON(result);

if (result.success) {

parent.$.modalDialog.openner_dataGrid.datagrid('reload');

parent.$.messager.alert('提示', result.msg, 'info');

parent.$.modalDialog.handler.dialog('close');

parent.$.messager.progress('close');

} else {

parent.$.messager.alert('提示', result.msg, 'info');

parent.$.messager.progress('close');

}

});

</script>

<tr>

<td><b>请选择上传文件：</b><input type="file" id="csvFile" name="csvFile" class=""/></td>

</tr>

<tr>

<td><a href="${pageContext.request.contextPath}/fileController/download">模板文件下载</a></td>

</tr>

</table>

</form>

</div>

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