spring mvc 文件上传工具类

虽然文件上传在框架中,已经不是什么困难的事情了,但自己还是开发了一个文件上传工具类,是基于springmvc文件上传的。

工具类只需要传入需要的两个参数,就可以上传到任何想要上传的路径:

参数1:HttpServletRequest request

参数2:String storePath   //文件存储相对路径 ,例如:"/upload","/image","/local/file"

返回值:上传到服务器的相对路径

一:代码实现

import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.UUID; import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.web.multipart.commons.CommonsMultipartResolver; public class FileUploadUtils {
/**
*
* @param request
* @param storePath 文件存储相对路径 ,例如:"/upload","/image","/local/file"
* @return
*/
public static String tranferFile(HttpServletRequest request,String storePath){
CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext());
//先判断request中是否包涵multipart类型的数据,
if(multipartResolver.isMultipart(request)){
//再将request中的数据转化成multipart类型的数据
MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;
Iterator iter = multiRequest.getFileNames();
while(iter.hasNext()){
MultipartFile file = multiRequest.getFile((String)iter.next());
if(file != null){
String originalFileName = file.getOriginalFilename(); String path =request.getSession().getServletContext().getRealPath(storePath);
//得到存储到本地的文件名
String localFileName=UUID.randomUUID().toString()+getFileSuffix(originalFileName);
//新建本地文件
File localFile = new File(path,localFileName);
            //创建目录
File fileDir=new File(path);
                    if (!fileDir.isDirectory()) {
                        // 如果目录不存在,则创建目录
                        fileDir.mkdirs();
                    } String src=storePath+"/"+localFileName;
//写文件到本地
try {
file.transferTo(localFile);
return src;
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
return null;
}
/**
* 获取文件后缀
* @param originalFileName
* @return
*/
public static String getFileSuffix(String originalFileName){
int dot=originalFileName.lastIndexOf('.');
if((dot>-1)&&(dot<originalFileName.length())){
return originalFileName.substring(dot);
}
return originalFileName;
}
}

二:controller 调用

@Controller
@RequestMapping("/file")
public class FileUploadController { @RequestMapping("save")
@ResponseBody
public String save(String name,String password,HttpServletRequest request,HttpServletResponse response){
System.out.println("name-----------------------"+name);
System.out.println("password-----------------------"+password);return FileUploadUtils.tranferFile(request, "/upload");
}
}

三:jsp页面代码

<h2>文件上传</h2>
<form name="upload" action="/file/save" enctype="multipart/form-data" method="post">
  姓名:<input name="name" type="text">
  密码:<input name="password" type="text">
  文件:<input type="file" name="thefile" />
  <input type="submit" value="上传文件" />
</form>

四:springmvc配置文件中, 配置文件上传视图支持

<!-- 支持上传文件 -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="defaultEncoding" value="UTF-8"></property>
<property name="maxUploadSize" value="20000000"></property>
</bean>

至此,一个完整的springmvc文件上传工具完毕。

上一篇:Android H5混合开发(1):构建Cordova 项目


下一篇:移动端H5混合开发设置复盘与总结