SpringMVC文件上传笔记

1.首先导入两个包。

java将上传文件保存数据库。

2.在spring-web.xml里配置解析器。其中id的值为multipartResolver不能变。

    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"><property name="maxUploadSize" value="1048576"/><property name="defaultEncoding" value="utf-8"/></bean>

（单文件上传）

Java上传文件？3.在jsp或者html页面的form表单中需要写一个属性enctype="multipart/form-data".

        <form action="/modelmaptest/uploadfile.do" method="post" enctype="multipart/form-data"><input type="file" name="fileItem"/><br><input type="submit" value="上传"/><p>${msg }</p></form>

4.在controller里接收文件,用MultipartFile类。

@Controller
public class ModelController {@RequestMapping(value="/uploadfile.do",method=RequestMethod.POST)public String addBook(ModelMap map,@RequestParam MultipartFile fileItem){String filename = fileItem.getOriginalFilename();int index = filename.lastIndexOf("\\");if(index!=-1){filename = filename.substring(index+1);}filename = UUID.randomUUID().toString()+"_"+filename;String savepath = "F:/apache-tomcat-7.0.69/webapps/appImages";File destFile = new File(savepath,filename);try {fileItem.transferTo(destFile);map.addAttribute("msg","上传成功！");} catch (Exception e) {map.addAttribute("msg","上传失败！");e.printStackTrace();}return "/index.jsp";}
}

多文件上传和单文件类似，jsp页面的文件name属性都得一样才行。

        <form action="/modelmaptest/uploadfile.do" method="post" enctype="multipart/form-data"><input type="file" name="fileItem"/><br><input type="file" name="fileItem"/><br><input type="submit" value="上传"/><p>${msg }</p></form>

在controller里边就需要用数组来接收了，此处是接收两个文件用file[index]接收，还可以用遍历数组的方式来接收所有文件,根据需求即可。

@RequestMapping(value="/uploadfile.do",method=RequestMethod.POST)public String addBook(ModelMap map,@RequestParam MultipartFile[] fileItem){String filename = fileItem[0].getOriginalFilename();int index = filename.lastIndexOf("\\");if(index!=-1){filename = filename.substring(index+1);}filename = UUID.randomUUID().toString()+"_"+filename;String savepath = "F:/apache-tomcat-7.0.69/webapps/appImages";File destFile = new File(savepath,filename);try {fileItem[0].transferTo(destFile);map.addAttribute("msg","上传成功！");} catch (Exception e) {map.addAttribute("msg","上传失败！");e.printStackTrace();}filename = fileItem[1].getOriginalFilename();index = filename.lastIndexOf("\\");if(index!=-1){filename = filename.substring(index+1);}filename = UUID.randomUUID().toString()+"_"+filename;destFile = new File(savepath,filename);try {fileItem[1].transferTo(destFile);map.addAttribute("msg","上传成功！");} catch (Exception e) {map.addAttribute("msg","上传失败！");e.printStackTrace();}return "/index.jsp";}
}