用Spring实现文件上传(CommonsMultipartFile)！

2012-02-16 18:10:26| 分类：计算机--JAVA EE-|字号订阅

spring中的文件上传实际比较容易
1、页面中
<html>
   <body>
   <form action="upload.do" method="post"   enctype="multipart/form-data">
    <input type="file"   name="uploadfile" />
    <input type="submit" value="提交" />
   </form>
   </body>
</html>
2、修改spring的配置文件添加
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
         <property name="maxUploadSize">
             <value>1048576</value>
         </property>
     </bean>
其中class部分可以选用CommonsMutipartResolver或CosMultipartResolver，但是别忘记添加相应的jar文件
3、对应的控制器和实体类中无需添加uploadfile文件
4、对应的Controller

package cn.com.babe;

import java.io.DataOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.validation.BindException;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.web.multipart.commons.CommonsMultipartFile;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.SimpleFormController;

public class UploadAction extends SimpleFormController {
private String viewsucc;
private String viewfalse;

public String getViewsucc() {
return viewsucc;
}

public void setViewsucc(String viewsucc) {
this.viewsucc = viewsucc;
}

public String getViewfalse() {
return viewfalse;
}

public void setViewfalse(String viewfalse) {
this.viewfalse = viewfalse;
}

protected ModelAndView onSubmit(HttpServletRequest request,
    HttpServletResponse response, Object command, BindException errors)
    throws Exception {
   String view = getViewfalse();
   MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
   CommonsMultipartFile orginalFile = (CommonsMultipartFile) multipartRequest
     .getFile("uploadfile");// 表单中对应的文件名；
   if (orginalFile != null && !orginalFile.isEmpty()) {// 如果有文章中带有附件
    String filename = orginalFile.getOriginalFilename();
    DataOutputStream out = new DataOutputStream(new FileOutputStream(
      "c:/" + filename));// 存放文件的绝对路径
    InputStream is = null;// 附件输入流
    try {
     is = orginalFile.getInputStream();
     byte[] b=new byte[is.available()];
     is.read(b);
     out.write(b);
    } catch (IOException exception) {
     exception.printStackTrace();
    } finally {
     if (is != null) {
      is.close();
     }
     if (out != null) {
      out.close();
     }
    }
    view=getViewsucc();
   }
   return new ModelAndView(view, null);
}

}

通过上面的方式就可以文件上传了。我做的只是把所有的上传文件拷贝到c盘根目录下，并且设置了上传文件最大大小为1mb。