上传工具类java

1,在pom.xml中加入配置

<dependency>        <groupId>commons-io</groupId>        <artifactId>commons-io</artifactId>        <version>2.4</version></dependency><dependency><groupId>commons-fileupload</groupId><artifactId>commons-fileupload</artifactId><version>1.2.1</version></dependency><dependency><groupId>org.apache.commons</groupId><artifactId>commons-math</artifactId><version>2.2</version></dependency>

2,在springmvc.xml中配置

 <!-- 文件上传的配置 --><bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">          <!-- set the max upload size100MB -->          <property name="maxUploadSize">              <value>104857600</value>          </property>          <property name="maxInMemorySize">              <value>4096</value>          </property>          <property name="defaultEncoding">           <value>utf-8</value>        </property>   </bean>

3,     上传时,记得在form中添加 method=”post” enctype=”multipart/form-data” 必须加

package com.util;import java.io.BufferedInputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.io.UnsupportedEncodingException;import java.util.UUID;import javax.servlet.ServletContext;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.web.multipart.MultipartFile;/** * 文件上传和下载工具类 *  */public class UploadUtils {/** * @Description  文件上传: *                      获得文件名称,文件保存路径,输入流,然后用流将他写入到具体的位置,即可完成文件上传 * @param request * @param file * @return  上传文件的保存路径 */public static String uploadFile(HttpServletRequest request,MultipartFile file) {// 目标一:获得原始文件名  String fileName = file.getOriginalFilename();  // 新文件名 (使用UUID生成新的文件名)//String newFileName = UUID.randomUUID() + fileName; String newFileName =  fileName; // 获得项目的路径  ServletContext sc = request.getSession().getServletContext();// 目标二: 文件保存路径String path = sc.getRealPath("/img") + "\\";File f = new File(path);  if (!f.exists())  f.mkdirs();  if (!file.isEmpty()) {  try {  FileOutputStream fos = new FileOutputStream(path + newFileName);  //目标三: 输入流InputStream in = file.getInputStream();  int b = 0;  while ((b = in.read()) != -1) {  fos.write(b);  }  fos.close();  in.close();  } catch (Exception e) {  e.printStackTrace();  }  }  return path + newFileName;}    /** * @Description  文件下载: *                     读取文件到流中,然后通过输出流输出 * @param filePath 完整的要下载的文件的路径 * @param fileName 文件的名称 * @param response 响应流 * @return         执行结果 * @throws UnsupportedEncodingException  */public static boolean downloadFile(String filePath,String fileName,HttpServletResponse response) throws UnsupportedEncodingException {Boolean result = false;//目标一:将文件从电脑中读入到流中File file = new File(filePath);if (file.exists()) {response.setCharacterEncoding("UTF-8");//设置相应内容的编码格式response.setContentType("application/octet-stream;charset=utf-8");  response.setHeader("Content-Disposition", "attachment;filename=" + new String(fileName.getBytes(),"iso-8859-1"));byte[] buffer = new byte[1024];FileInputStream fis = null;BufferedInputStream bis = null;try {//目标一:将文件从电脑中读入到流中fis = new FileInputStream(file);bis = new BufferedInputStream(fis);OutputStream os = response.getOutputStream();int i = bis.read(buffer);while (i != -1) {//目标二:通过输出流输出os.write(buffer, 0, i);i = bis.read(buffer);result = true;}} catch (Exception e) {// TODO: handle exceptione.printStackTrace();} finally {if (bis != null) {try {bis.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}if (fis != null) {try {fis.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}return result;}}