springMVC 文件下载

方法一

package com.clj.test.down.util;

import java.io.File;
import java.io.IOException;

import org.apache.commons.io.FileUtils;
import org.springframework.context.annotation.Scope;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.RequestMapping;

/**
* <一句话功能简述>
* <功能详细描述>
*
* @author Administrator
* @version [版本号, 2014年3月7日]
* @see [相关类/方法]
* @since [产品/模块版本]
*/
@Component
@Scope("prototype")
@RequestMapping("/downloadFile")
public class DownloadAction
{

@RequestMapping("download")
public ResponseEntity<byte[]> download() throws IOException {
String path="D:\\workspace\\.metadata\\.plugins\\org.eclipse.wst.server.core\\tmp0\\wtpwebapps\\springMVC\\WEB-INF\\upload\\图片10（定价后）.xlsx";
File file=new File(path);
HttpHeaders headers = new HttpHeaders();
String fileName=new String("你好.xlsx".getBytes("UTF-8"),"iso-8859-1");//为了解决中文名称乱码问题
headers.setContentDispositionFormData("attachment", fileName);
headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),
headers, HttpStatus.CREATED);
}
}


方法二

public class WordView implements View {

public String contentType = "application/msword";
private String fileName = "unknow.doc";
private InputStream istream;
public String getContentType() {
return contentType;
}

public WordView(String fileName, InputStream istream){
this.fileName = fileName;
this.istream = istream;

}


/**
*Spring View的扩展实现
*@see View
*/
public void render(Map<String, ?> arg0, HttpServletRequest arg1,
HttpServletResponse response) throws Exception {
response.addHeader("Content-disposition", "attachment; filename=" + java.net.URLEncoder.encode(fileName, "UTF-8"));
//response.setContentLength(istream.available());
response.setContentType(contentType);
POIFSFileSystem poifs = new POIFSFileSystem();
DirectoryEntry directory = poifs.getRoot();
directory.createDocument("WordDocument", this.istream);
poifs.writeFilesystem(response.getOutputStream());
response.getOutputStream().close();
}


}


上传：
public static String upload(HttpServletRequest request,String fileDir) {

MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
//MultipartResolver resolver = new CommonsMultipartResolver(request.getSession().getServletContext());
//MultipartHttpServletRequest multipartRequest = resolver.resolveMultipart(request);

/**页面控件的文件流**/
MultipartFile multipartFile = multipartRequest.getFile("file");

//无文件上传
if (multipartFile == null || "".equals(multipartFile.getOriginalFilename()))
return null;

/**得到图片保存目录的真实路径**/
String logoRealPathDir = request.getSession().getServletContext().getRealPath(fileDir);

/**根据真实路径创建目录**/
File logoSaveFile = new File(logoRealPathDir);
if(!logoSaveFile.exists())
logoSaveFile.mkdirs();

String dateStr = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date());

/**获取文件的后缀**/
String suffix = multipartFile.getOriginalFilename().substring(multipartFile.getOriginalFilename().lastIndexOf("."));

String logImageName = dateStr+ suffix;//构建文件名称

/**拼成完整的文件保存路径加文件**/
String fileName = logoRealPathDir + "/" + logImageName;
File file = new File(fileName);

try {
multipartFile.transferTo(file);
} catch (Exception e) {
e.printStackTrace();
}

return logImageName;
}