SpringMVC实现文件上传&下载(2)
文件上传步骤
第一步：由于SpringMVC使用的是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<input type="file" name="****"/>,如果是单个文件直接使用MultipartFile 即可
springmvc.xml
<!-- 文件上传 -->
<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!-- 设置上传文件的最大尺寸为10MB -->
<property name="maxUploadSize">
<value>10000000</value>
</property>
</bean>
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();
}
}
注意：注意：设置表单中form表单的属性为：enctype="multipart/form-data"