文件上传步骤
第一步:由于SpringMVC利用的是commons-fileupload实现,故将其组件引入项目中,这里用到的是commons-fileupload-1.2.1.jar和commons-io-1.3.2.jar。
第二步:spring-mvx中配置MultipartResolver处理器。可在此加入对上传文件的属性限制。
第三步:在Controller的方法中添加MultipartFile参数。该参数用于接收表单中file组件的内容
第四步:编写前台表单。注意enctype="multipart/form-data"以及,如果是单个文件直接利用MultipartFile 即可
springmvc.xml
- <bean id="multipartResolver"
- >
-
- <property name="maxUploadSize">
- <value>10000000</value>
- </property>
- </bean>
复制代码 controller
- import java.io.BufferedInputStream;
- import java.io.BufferedOutputStream;
- import java.io.File;
- import java.io.FileInputStream;
- import java.io.IOException;
- import javax.servlet.http.HttpServletRequest;
- import javax.servlet.http.HttpServletResponse;
- import org.apache.commons.fileupload.FileUpload;
- import org.apache.commons.io.FileUtils;
- import org.springframework.stereotype.Controller;
- import org.springframework.web.bind.annotation.RequestMapping;
- import org.springframework.web.bind.annotation.RequestParam;
- import org.springframework.web.multipart.MultipartFile;
- import org.springframework.web.servlet.ModelAndView;
- @Controller
- public class FileUploadController {
- //TODO:上传代码
- @RequestMapping("/fileupload")
- public ModelAndView upload(String name,
- //上传多个文件
- @RequestParam("file") MultipartFile[] file,
- HttpServletRequest request) throws IllegalStateException,
- IOException {
- //获取文件 存储位置
- String realPath = request.getSession().getServletContext()
- .getRealPath("/uploadFile");
- File pathFile = new File(realPath);
- if (!pathFile.exists()) {
- //文件夹不存 创建文件
- pathFile.mkdirs();
- }
- for (MultipartFile f : file) {
- System.out.println("文件类型:"+f.getContentType());
- System.out.println("文件名称:"+f.getOriginalFilename());
- System.out.println("文件大小:"+f.getSize());
- System.out.println(".................................................");
- //将文件copy上传到服务器
- f.transferTo(new File(realPath + "/" + f.getOriginalFilename()));
- //FileUtils.copy
- }
- //获取modelandview对象
- ModelAndView view = new ModelAndView();
- view.setViewName("redirect:index.jsp");
- return view;
- }
- //TODO:下载代码
- @RequestMapping(value = "/filedownload")
- public ModelAndView download(HttpServletRequest request,
- HttpServletResponse response) throws Exception {
- // String storeName = "Spring3.xAPI_zh.chm";
- String storeName="文件.txt";
- String contentType = "application/octet-stream";
- FileUploadController.download(request, response, storeName, contentType);
- return null;
- }
- //文件下载 主要方法
- public static void download(HttpServletRequest request,
- HttpServletResponse response, String storeName, String contentType
- ) throws Exception {
- request.setCharacterEncoding("UTF-8");
- BufferedInputStream bis = null;
- BufferedOutputStream bos = null;
- //获取项目根目录
- String ctxPath = request.getSession().getServletContext()
- .getRealPath("");
- //获取下载文件露肩
- String downLoadPath = ctxPath+"/uploadFile/"+ storeName;
- //获取文件的长度
- long fileLength = new File(downLoadPath).length();
- //设置文件输出类型
- response.setContentType("application/octet-stream");
- response.setHeader("Content-disposition", "attachment; filename="
- + new String(storeName.getBytes("utf-8"), "ISO8859-1"));
- //设置输出长度
- response.setHeader("Content-Length", String.valueOf(fileLength));
- //获取输入流
- bis = new BufferedInputStream(new FileInputStream(downLoadPath));
- //输出流
- 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);
- }
- //关闭流
- bis.close();
- bos.close();
- }
- }
复制代码注意:注意:设置表单中form表单的属性为:enctype="multipart/form-data"
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