Spring mvc 文件上传到文件夹（转载+心得）

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spring mvc(注解)上传文件的简单例子,这有几个需要注意的地方
1.form的enctype=”multipart/form-data” 这个是上传文件必须的
2.applicationContext.xml中 <bean id=”multipartResolver” class=”org.springframework.web.multipart.commons.CommonsMultipartResolver”/> 关于文件上传的配置不能少

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"
default-lazy-init="true">
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" lazy-init="false" />
<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" p:prefix="/WEB-INF/jsp/" p:suffix=".jsp" />
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="maxUploadSize" value="10000000000000"/></bean>
</beans>

UploadAction.java

package com.codeif.action;
import java.io.File;
import java.util.Date;
import javax.servlet.http.HttpServletRequest;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;
@Controller
public class UploadAction {
@RequestMapping(value = "/upload.do")
public String upload(@RequestParam(value = "file", required = false) MultipartFile file, HttpServletRequest request, ModelMap model) {
System.out.println("开始");
String path = request.getSession().getServletContext().getRealPath("upload");
String fileName = file.getOriginalFilename();
// String fileName = new Date().getTime()+".jpg";
System.out.println(path);
File targetFile = new File(path, fileName);
if(!targetFile.exists()){
targetFile.mkdirs();
}
//保存
try {
// file.transferTo(targetFile);
//也可以用这种方式，上面的方式能上传，但是老是报输出流被占用的错误。
SaveFileFromInputStream(
file.getInputStream(), realPath + filePath, name + "."+ fileType);
} catch (Exception e) {
e.printStackTrace();
}
model.addAttribute("fileUrl", request.getContextPath()+"/upload/"+fileName);
return "result";
}
}

SaveFileFromInputStream()的实现如下：

public void SaveFileFromInputStream(InputStream stream, String path,
   String filename) throws IOException {
   {      //path + "/"+ filename
    FileOutputStream fs = new FileOutputStream(path + "/"+ filename);
          byte[] buffer =new byte[1024*1024];
          int bytesum = 0;
          int byteread = 0;
          while ((byteread=stream.read(buffer))!=-1)
          {
             bytesum+=byteread;
             fs.write(buffer,0,byteread);
             fs.flush();
          }
          fs.close();
          stream.close();
      }

index.jsp