关于springmvc上传文件的具体介绍可参看spring的官方文档 The Web模块
这里只总结具体的简单代码实现。
1.springMVC单文件上传
1.1 解析器配置
1.1.1 使用CommonsMultipartResolver
<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!-- one of the properties available; the maximum/maxmemery file size in bytes -->
<property name="maxUploadSize" value="12345678900"/>
<property name="maxInMemorySize" value="20480"/>
<property name="defaultEncoding" value="UTF-8"/>
</bean>CommonsMultipartResolver， 需要使用commons-fileupload.jar包
1.1.2 使用CosMultipartResolver
<bean id="multipartResolver" class="org.springframework.web.multipart.cos.CosMultipartResolver">
<!-- one of the properties available; the maximum/maxmemery file size in bytes -->
<property name="maxUploadSize" value="12345678900"/>
<property name="maxInMemorySize" value="20480"/>
<property name="defaultEncoding" value="UTF-8"/>
</bean>
CosMultipartResolver， 需要使用cos.jar包
1.2 表单配置
<html>
<head>
<title>Upload a file please</title>
</head>
<body>
<h1>Please upload a file</h1>
<form method="post" action="upload.form" enctype="multipart/form-data">
<input type="file" name="file"/>
<input type="submit"/>
</form>
</body>
</html>在上面这个表单里有一个input元素，这个元素的名字（“file”）和服务器端处理这个表单的bean中类型为byte[]的属性名相同。 在这个表单里我们也声明了编码参数（enctype=”multipart/form-data”）以便让浏览器知道如何对这个文件上传表单进行编码
1.3 定义 controller类实现上传的具体逻辑
@Controller
public class UploadController {
@RequestMapping("/fileupload")
public String upload(@RequestParam("filename") CommonsMultipartFile file , HttpServletRequest req) throws IOException {
//解析路径
String path = req.getRealPath("/fileupload");
//解析文件名
String filename = file.getOriginalFilename();
//新建file对象
File targetFile = new File(path,filename);
//判断文件是否存在
if (!targetFile.exists()){
targetFile.mkdirs();//不存在新建
}
file.transferTo(targetFile);
//成功后返回的页面
return "index.jsp";
}
2 多文件上传
解析器相同不需要配置
2.1 配置表单
<form action="uploadfiles" method="post" enctype="multipart/form-data">
<input type="file" name="filename"/><br>
<input type="file" name="filename"/><br>
<input type="file" name="filename"/><br>
<input type="submit" value="确定"/>
</form>2.2 定义controller类
@RequestMapping("/uploadfiles")
public String uploadFiles(@RequestParam("filename")CommonsMultipartFile[] files ,HttpServletRequest req) throws IOException {
String path = req.getRealPath("/fileupload");
for (int i = 0; i < files.length; i++) {
InputStream is = files[i].getInputStream();
OutputStream os = new FileOutputStream(new File(path,files[i].getOriginalFilename()));
int len = 0;
byte[] buffer = new byte[1024];
while ((len = is.read(buffer))!=-1){
os.write(buffer,0,len);
}
os.close();
is.close();
}
return "index.jsp";
}
