标签：属性 tin ram contex bean 需要 stream bsp put
一、SpringMVC实现文件的上传
Spring MVC 上下文中默认没有为文件上传提供了直接的支持，因 此默认情况下不能处理文件的上传工作，
如果想使用 Spring 的文件上传功能，需现在上下文中配置 CommonsMultipartResovler:
二、文件上传的步骤：
1.加入jar包：
commons-fileupload-1.3.1.jar
commons-io-2.4.jar
2.在SpringMVC配置文件中配置CommonsMultipartResovler
<!-- 配置文件上传 --> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <property name="defaultEncoding" value="utf-8"></property> <property name="maxUploadSize" value="1024000"></property> </bean>
3.前端表单：注意：需要请求方式：POST，input类型：file，属性：enctype="multipart/form-data"
<form action="${pageContext.request.contextPath }/testUpload" method="post" enctype="multipart/form-data">
file:<input type="file" name="photo">
desc:<input type="text" name="desc">
<input type="submit" value="上传">
</form>
4.文件上传方法的实现
@RequestMapping("/testUpload")
public String testUpload(HttpServletRequest request,@RequestParam(value="desc",required=false)String desc,@RequestParam("photo") CommonsMultipartFile file){
ServletContext servletContext = request.getServletContext();
String realPath = servletContext.getRealPath("/upload");
File file1 = new File(realPath);
if(!file1.exists()){
file1.mkdir();
}
OutputStream out = null;
InputStream in = null;
//uuid_name.jpg
String prefix = UUID.randomUUID().toString();
prefix = prefix.replace("-","");
String fileName = prefix+"_"+file.getOriginalFilename();
System.out.println(fileName);
try {
out = new FileOutputStream(new File(realPath+"\\"+fileName));
in = file.getInputStream();
//创建一个缓冲区
byte buffer[]=new byte[1024];
//判断输入流中的数据是否已经对完
int len=0;
//循环将输入流读入到缓冲区中（len=in.read(buffer)>0）表示in里面还有数据
while((len=in.read(buffer))!=-1){
//使用FileOutPutStream输出流，将缓冲区的数据输出到指定目录文件
out.write(buffer,0,len);
}
} catch (Exception e) {
e.printStackTrace();
}
//关闭输入流、输出流
try {
out.close();
in.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return "success";
}
三、文件的下载
文件能上传就能下载
1.用ResponseEntity<byte[]> 返回值完成文件下载：
@RequestMapping(value="/testDownLoad")
public ResponseEntity<byte[]> testDonwLoad(HttpServletRequest request) throws Exception{
ServletContext servletContext=request.getServletContext();
String fileName="风吹麦浪.mp3";
String realPath = servletContext.getRealPath("/WEB-INF/"+fileName);
InputStream in=new FileInputStream(new File(realPath));
byte [] body=new byte[in.available()];
in.read(body);
MultiValueMap<String, String> headers=new HttpHeaders();
fileName=new String(fileName.getBytes("gbk"),"iso8859-1");
headers.set("Content-Disposition", "attachment;filename="+fileName);
HttpStatus status=HttpStatus.OK;
ResponseEntity<byte []> responseEntity=new ResponseEntity<>(body, headers,status);
in.close();
return responseEntity;
}
标签：属性 tin ram contex bean 需要 stream bsp put
原文地址：http://www.cnblogs.com/Actexpler-S/p/7424999.html
