上传
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
Document
文件上传
- 文件上传的表单method属性值必须为post
- 文件上传控件使用的是input元素type属性值为file
- 将文件上传的表单form元素的enctype属性值设置为multipart/form-data
下载照片
下载我的照片
下载PDF文件
下载zip文件
上传控制器
package com.kaishengit.web;
@WebServlet("/upload2")
@MultipartConfig
public class FileUploadServlet2 extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.getRequestDispatcher("/WEB-INF/views/upload2.jsp").forward(req,resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.setCharacterEncoding("UTF-8");
String desc = req.getParameter("desc");
//根据name属性值获取对应的part对象
Part part = req.getPart("file");
System.out.println("getName:" + part.getName()); //name属性值
System.out.println("getContentType:" + part.getContentType()); //文件的MIME类型
System.out.println("getSize:" + part.getSize()); //上传文件的体积（字节）
System.out.println("getSubittedFileName:" + part.getSubmittedFileName()); //获取上传的文件名
//System.out.println(FileUtils.byteCountToDisplaySize(part.getSize()));
File saveDir = new File("D:/upload");
if(!saveDir.exists()) {
saveDir.mkdir();
}
String fileName = part.getSubmittedFileName();
String newName = UUID.randomUUID().toString() + fileName.substring(fileName.lastIndexOf("."));
InputStream inputStream = part.getInputStream();
FileOutputStream outputStream = new FileOutputStream(new File(saveDir,newName));
IOUtils.copy(inputStream,outputStream);
outputStream.flush();
outputStream.close();
inputStream.close();
System.out.println(fileName + " -> upload success!");
}
}
下载
下载照片
下载我的照片
下载PDF文件
下载zip文件
下载控制器
package com.kaishengit.web;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.StringUtils;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
@WebServlet("/download")
public class DownloadServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String fileName = req.getParameter("file");
String name = req.getParameter("name");
//url中含有中文乱码转换
//fileName = new String(fileName.getBytes("ISO8859-1"),"UTF-8");
//System.out.println("fileName:" + fileName);
File saveDir = new File("D:/upload");
File file = new File(saveDir,fileName);
if(file.exists()) {
if(StringUtils.isNotEmpty(name)) {
//设置相应的文件头 MIME Type
resp.setContentType("application/octet-stream");
//设置文件的总大小
resp.setContentLength((int) file.length());
//resp.setContentLengthLong(file.length());
name = new String(name.getBytes("UTF-8"), "ISO8859-1"); //将浏览器弹出的对话框文字变成中文
//设置弹出对话框的文件名称
resp.addHeader("Content-Disposition", "attachment; filename=\"" + name + "\"");
}
//响应输出流
OutputStream outputStream = resp.getOutputStream();
//文件输入流
FileInputStream inputStream = new FileInputStream(file);
IOUtils.copy(inputStream,outputStream);
outputStream.flush();
outputStream.close();
inputStream.close();
} else {
resp.sendError(404,"文件找不到");
}
}
}
springMvc 上传下载
添加pom依赖
commons-fileupload
commons-fileupload
1.3.2
配置springmvc-servlet.xml
form表单
控制器
@RequestMapping("/upload")
public String fileupload(String name,MultipartFile file) {
System.out.println("name:" + name);
System.out.println("OriginalFileName:" + file.getOriginalFilename());
System.out.println("size" + file.getSize());
if(!file.isEmpty()) {
InputStream inputStream = file.getInputStream();
//后面的该会了吧
}
return "";
}
package com.xtuer.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.util.FileCopyUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.ServletContext;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
@Controller
public class UploadController {
@Autowired
private ServletContext servletContext;
/**
* 上传单个文件的页面
* @return 页面的路径
*/
@RequestMapping(value = "/upload-file", method = RequestMethod.GET)
public String uploadFilePage() {
return "upload-file.html";
}
/**
* 上传单个文件
*
* @param file 上传文件 MultipartFile 的对象
* @return 上传的结果
*/
@RequestMapping(value = "/upload-file", method = RequestMethod.POST)
@ResponseBody
public String uploadFile(@RequestParam("file") MultipartFile file) {
saveFile(file);
return "Success";
}
/**
* 把 HTTP 请求中的文件流保存到本地
*
* @param file MultipartFile 的对象
*/
private boolean saveFile(MultipartFile file) {
if (!file.isEmpty()) {
try {
// getRealPath() 取得 WEB-INF 所在文件夹路径
// 如果参数是 "/temp", 当 temp 存在时返回 temp 的本地路径, 不存在时返回 null/temp (无效路径)
String path = servletContext.getRealPath("") + File.separator + file.getOriginalFilename();
FileCopyUtils.copy(file.getInputStream(), new FileOutputStream(path));
return true;
} catch (IOException e) {
e.printStackTrace();
}
}
return false;
}
}
使用SpringMVC优雅的下载文件
@GetMapping("/download")
@ResponseBody
public ResponseEntity downLoadFile(Integer id) throws FileNotFoundException {
InputStream inputStream = diskService.downloadFile(id);
Disk disk = diskService.findById(id);
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
headers.setContentDispositionFormData("attachement",disk.getSourceName(), Charset.forName("UTF-8"));
return new ResponseEntity<>(new InputStreamResource(inputStream),headers, HttpStatus.OK);
}
@GetMapping("/download")
public ResponseEntity downloadFile() throws FileNotFoundException {
File file = new File("E:/upload/12345.jpg");
HttpHeaders httpHeaders = new HttpHeaders();
httpHeaders.setContentType(MediaType.APPLICATION_OCTET_STREAM);
httpHeaders.setContentLength(file.length());
httpHeaders.setContentDispositionFormData("attachment", "照片.jpg", Charset.forName("UTF-8"));
InputStreamResource inputStreamResource = new InputStreamResource(new FileInputStream(file));
return new ResponseEntity(inputStreamResource, httpHeaders, HttpStatus.OK);
}
poi详解
数据导出excel
/**
* 将数据导出为Excel文件
*/
@GetMapping("/day/{today}/data.xls")
public void exportCsvFile(@PathVariable String today, HttpServletResponse response) throws IOException {
List financeList = financeService.findByCreatDate(today);
response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-Disposition","attachment;filename=\""+today+".xls\"");
//1.创建工作表
Workbook workbook = new HSSFWorkbook();
//2.创建sheet页
Sheet sheet = workbook.createSheet("2017-02-23财务流水");
//单元格样式（可选）
/*CellStyle cellStyle = workbook.createCellStyle();
cellStyle.*/
//3.创建行 从0开始
Row row = sheet.createRow(0);
Cell c1 = row.createCell(0);
c1.setCellValue("业务流水号");
row.createCell(1).setCellValue("创建日期");
row.createCell(2).setCellValue("类型");
row.createCell(3).setCellValue("金额");
row.createCell(4).setCellValue("业务模块");
row.createCell(5).setCellValue("业务流水号");
row.createCell(6).setCellValue("状态");
row.createCell(7).setCellValue("备注");
row.createCell(8).setCellValue("创建人");
row.createCell(9).setCellValue("确认人");
row.createCell(10).setCellValue("确认日期");
for(int i = 0;i < financeList.size();i++) {
Finance finance = financeList.get(i);
Row dataRow = sheet.createRow(i+1);
dataRow.createCell(0).setCellValue(finance.getSerialNumber());
dataRow.createCell(1).setCellValue(finance.getCreateDate());
dataRow.createCell(2).setCellValue(finance.getType());
dataRow.createCell(3).setCellValue(finance.getMoney());
dataRow.createCell(4).setCellValue(finance.getModule());
dataRow.createCell(5).setCellValue(finance.getModuleSerialNumber());
dataRow.createCell(6).setCellValue(finance.getState());
dataRow.createCell(7).setCellValue(finance.getMark());
dataRow.createCell(8).setCellValue(finance.getCreateUser());
dataRow.createCell(9).setCellValue(finance.getConfirmUser());
dataRow.createCell(10).setCellValue(finance.getConfirmDate());
}
sheet.autoSizeColumn(0);
sheet.autoSizeColumn(1);
sheet.autoSizeColumn(5);
sheet.autoSizeColumn(10);
OutputStream outputStream = response.getOutputStream();
workbook.write(outputStream);
outputStream.flush();
outputStream.close();
}
下载zip
控制器
/**
* 合同文件的打包下载
* @param id
*/
@GetMapping("/doc/zip")
public void downloadZipFile(Integer id,HttpServletResponse response) throws IOException {
DeviceRent rent = deviceService.findDeviceRentById(id);
if(rent == null) {
throw new NotFoundException();
} else {
//将文件下载标记为二进制
response.setContentType(MediaType.APPLICATION_OCTET_STREAM.toString());
//更改文件下载的名称
String fileName = rent.getCompanyName()+".zip";
fileName = new String(fileName.getBytes("UTF-8"),"ISO8859-1");
response.setHeader("Content-Disposition","attachment;filename=\""+fileName+"\"");
OutputStream outputStream = response.getOutputStream();
ZipOutputStream zipOutputStream = new ZipOutputStream(outputStream);
deviceService.downloadZipFile(rent,zipOutputStream);
}
}
service
@Override
public void downloadZipFile(DeviceRent rent, ZipOutputStream zipOutputStream) throws IOException {
//查找合同有多少个合同附件
List deviceRentDocs = findDeviceRentDocListByRentId(rent.getId());
for(DeviceRentDoc doc : deviceRentDocs) {
ZipEntry entry = new ZipEntry(doc.getSourceName());
zipOutputStream.putNextEntry(entry);
InputStream inputStream = downloadFile(doc.getId());
IOUtils.copy(inputStream,zipOutputStream);
inputStream.close();
}
zipOutputStream.closeEntry();
zipOutputStream.flush();
zipOutputStream.close();
}
下载zip工具类
package com.toltech.util;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
/**
* @author Wgs
* @version 1.0
* @create：2018/05/25
*/
public class ZipUtils {
private ZipUtils(){
}
public static void doCompress(String srcFile, String zipFile) throws Exception {
doCompress(new File(srcFile), new File(zipFile));
}
/**
* 文件压缩
* @param srcFile 目录或者单个文件
* @param zipFile 压缩后的ZIP文件
*/
public static void doCompress(File srcFile, File zipFile) throws Exception {
ZipOutputStream out = null;
try {
out = new ZipOutputStream(new FileOutputStream(zipFile));
doCompress(srcFile, out);
} catch (Exception e) {
throw e;
} finally {
out.close();//记得关闭资源
}
}
public static void doCompress(String filelName, ZipOutputStream out) throws IOException{
doCompress(new File(filelName), out);
}
public static void doCompress(File file, ZipOutputStream out) throws IOException{
doCompress(file, out, "");
}
public static void doCompress(File inFile, ZipOutputStream out, String dir) throws IOException {
if ( inFile.isDirectory() ) {
File[] files = inFile.listFiles();
if (files!=null && files.length>0) {
for (File file : files) {
String name = inFile.getName();
if (!"".equals(dir)) {
name = dir + "/" + name;
}
ZipUtils.doCompress(file, out, name);
}
}
} else {
ZipUtils.doZip(inFile, out, dir);
}
}
public static void doZip(File inFile, ZipOutputStream out, String dir) throws IOException {
String entryName = null;
if (!"".equals(dir)) {
entryName = dir + "/" + inFile.getName();
} else {
entryName = inFile.getName();
}
ZipEntry entry = new ZipEntry(entryName);
out.putNextEntry(entry);
int len = 0 ;
byte[] buffer = new byte[1024];
FileInputStream fis = new FileInputStream(inFile);
while ((len = fis.read(buffer)) > 0) {
out.write(buffer, 0, len);
out.flush();
}
out.closeEntry();
fis.close();
}
public static void main(String[] args) throws Exception {
doCompress("E:/upload/", "E:/upload.zip");
}
}
为了更好的演示，首先创建一个文件实体FileBean，包含了文件路径和文件名称：
package com.javaweb.entity;
import java.io.Serializable;
/**
* 文件实体类*/
public class FileBean implements Serializable{
private static final long serialVersionUID = -5452801884470115159L;
private Integer fileId;//主键
private String filePath;//文件保存路径
private String fileName;//文件保存名称
public FileBean(){
}
//Setters and Getters ...
}
接下来，在控制层的方法里(示例为Spring MVC)，进行读入多个文件List，压缩成myfile.zip输出到浏览器的客户端：
/**
* 打包压缩下载文件
*/
@RequestMapping(value = "/downLoadZipFile")
public void downLoadZipFile(HttpServletResponse response) throws IOException{
String zipName = "myfile.zip";
List fileList = fileService.getFileList();//查询数据库中记录
response.setContentType("APPLICATION/OCTET-STREAM");
response.setHeader("Content-Disposition","attachment; filename="+zipName);
ZipOutputStream out = new ZipOutputStream(response.getOutputStream());
try {
for(Iterator it = fileList.iterator();it.hasNext();){
FileBean file = it.next();
ZipUtils.doCompress(file.getFilePath()+file.getFileName(), out);
response.flushBuffer();
}
} catch (Exception e) {
e.printStackTrace();
}finally{
out.close();
}
}
