springmvc怎么实现文件上传

springmvc怎么实现文件上传

package com.test.controller;

import java.io.File;
import java.util.Map;

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

import org.apache.commons.io.FilenameUtils;
import org.apache.commons.lang3.ArrayUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.commons.CommonsMultipartFile;

import com.test.servlet.NoSupportExtensionException;
import com.test.servlet.State;

@Controller
@RequestMapping(value = "/mvc")
public class UploadController {

/** 日志对象*/
private Log logger = LogFactory.getLog(this.getClass());

private static final long serialVersionUID = 1L;

/** 上传目录名*/
private static final String uploadFolderName = "uploadFiles";

/** 允许上传的扩展名*/
private static final String [] extensionPermit = {"txt", "xls", "zip"};

@RequestMapping(value = "/upload.do", method = RequestMethod.POST)
public @ResponseBody Map fileUpload(@RequestParam("file") CommonsMultipartFile file,
HttpSession session, HttpServletRequest request, HttpServletResponse response) throws Exception{
logger.info("UploadController#fileUpload() start");

//清除上次上传进度信息
String curProjectPath = session.getServletContext().getRealPath("/");
String saveDirectoryPath = curProjectPath + "/" + uploadFolderName;
File saveDirectory = new File(saveDirectoryPath);
logger.debug("Project real path [" + saveDirectory.getAbsolutePath() + "]");

// 判断文件是否存在
if (!file.isEmpty()) {
String fileName = file.getOriginalFilename();
String fileExtension = FilenameUtils.getExtension(fileName);
if(!ArrayUtils.contains(extensionPermit, fileExtension)) {
throw new NoSupportExtensionException("No Support extension.");
}
file.transferTo(new File(saveDirectory, fileName));
}

logger.info("UploadController#fileUpload() end");
return State.OK.toMap();
}

}