<form action="${pageContext.request.contextPath}/test/upload.do" method="post" enctype="multipart/form-data">
  <input type="file" name="img"><br /> 
  <input type="submit" name="提交">
</form>

@Controller
@RequestMapping("/test")
public class MyController {

  @RequestMapping(value = "/upload.do", method = RequestMethod.POST)
  // 這里的MultipartFile對(duì)象變量名跟表單中的file類型的input標(biāo)簽的name相同，所以框架會(huì)自動(dòng)用MultipartFile對(duì)象來(lái)接收上傳過(guò)來(lái)的文件，當(dāng)然也可以使用@RequestParam("img")指定其對(duì)應(yīng)的參數(shù)名稱
  public String upload(MultipartFile img, HttpSession session)
      throws Exception {
    // 如果沒有文件上傳，MultipartFile也不會(huì)為null，可以通過(guò)調(diào)用getSize()方法獲取文件的大小來(lái)判斷是否有上傳文件
    if (img.getSize() > 0) {
      // 得到項(xiàng)目在服務(wù)器的真實(shí)根路徑，如：/home/tomcat/webapp/項(xiàng)目名/images
      String path = session.getServletContext().getRealPath("images");
      // 得到文件的原始名稱，如：美女.png
      String fileName = img.getOriginalFilename();
      // 通過(guò)文件的原始名稱，可以對(duì)上傳文件類型做限制，如：只能上傳jpg和png的圖片文件
      if (fileName.endsWith("jpg") || fileName.endsWith("png")) {
        File file = new File(path, fileName);
        img.transferTo(file);
        return "/success.jsp";
      }
    }
    return "/error.jsp";
  }
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
  xmlns:context="http://www.springframework.org/schema/context"
  xsi:schemaLocation="
    http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx.xsd
    http://www.springframework.org/schema/mvc
    http://www.springframework.org/schema/mvc/spring-mvc.xsd
    http://www.springframework.org/schema/aop
    http://www.springframework.org/schema/aop/spring-aop.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context.xsd">

  ...

  <!-- 注意：CommonsMultipartResolver的id是固定不變的，一定是multipartResolver，不可修改 -->
  <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <!-- 如果上傳后出現(xiàn)文件名中文亂碼可以使用該屬性解決 -->
    <property name="defaultEncoding" value="utf-8"/>
    <!-- 單位是字節(jié)，不設(shè)置默認(rèn)不限制總的上傳文件大小，這里設(shè)置總的上傳文件大小不超過(guò)1M（1*1024*1024） -->
    <property name="maxUploadSize" value="1048576"/>
    <!-- 跟maxUploadSize差不多，不過(guò)maxUploadSizePerFile是限制每個(gè)上傳文件的大小，而maxUploadSize是限制總的上傳文件大小 -->
    <property name="maxUploadSizePerFile" value="1048576"/>
  </bean>

  <!-- 設(shè)置一個(gè)簡(jiǎn)單的異常解析器，當(dāng)文件上傳超過(guò)大小限制時(shí)跳轉(zhuǎn) -->
  <bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
    <property name="defaultErrorView" value="/error.jsp"/>
  </bean>
</beans>

<form action="${pageContext.request.contextPath}/test/upload.do" method="post" enctype="multipart/form-data">
  file 1 : <input type="file" name="imgs"><br /> 
  file 2 : <input type="file" name="imgs"><br /> 
  file 3 : <input type="file" name="imgs"><br /> 
  <input type="submit" name="提交">
</form>

@Controller
@RequestMapping("/test")
public class MyController {

  @RequestMapping(value = "/upload.do", method = RequestMethod.POST)
  // 這里的MultipartFile[] imgs表示前端頁(yè)面上傳過(guò)來(lái)的多個(gè)文件，imgs對(duì)應(yīng)頁(yè)面中多個(gè)file類型的input標(biāo)簽的name，但框架只會(huì)將一個(gè)文件封裝進(jìn)一個(gè)MultipartFile對(duì)象，
  // 并不會(huì)將多個(gè)文件封裝進(jìn)一個(gè)MultipartFile[]數(shù)組，直接使用會(huì)報(bào)[Lorg.springframework.web.multipart.MultipartFile;.<init>()錯(cuò)誤，
  // 所以需要用@RequestParam校正參數(shù)（參數(shù)名與MultipartFile對(duì)象名一致），當(dāng)然也可以這么寫：@RequestParam("imgs") MultipartFile[] files。
  public String upload(@RequestParam MultipartFile[] imgs, HttpSession session)
      throws Exception {
    for (MultipartFile img : imgs) {
      if (img.getSize() > 0) {
        String path = session.getServletContext().getRealPath("images");
        String fileName = img.getOriginalFilename();
        if (fileName.endsWith("jpg") || fileName.endsWith("png")) {
          File file = new File(path, fileName);
          img.transferTo(file);
        }
      }
    }
    return "/success.jsp";
  }
}

<form action="${pageContext.request.contextPath}/test/upload.do" method="post" enctype="multipart/form-data">

  一次選擇多個(gè)文件的多文件上傳 : <br /> 
  <input type="file" name="imgs1" multiple><br /> <br /> 

  一次選擇一個(gè)文件的多文件上傳 : <br /> 
  <input type="file" name="imgs2"><br /> 
  <input type="file" name="imgs2"><br /><br /> 

  單文件上傳 : <br /> 
  <input type="file" name="imgs3"><br /><br /> 
  <input type="submit" name="提交">
</form>

@Controller
@RequestMapping("/test")
public class MyController {

  @RequestMapping(value = "/upload.do", method = RequestMethod.POST)
  public String upload(@RequestParam MultipartFile[] imgs1,@RequestParam MultipartFile[] imgs2,@RequestParam MultipartFile[] imgs3, HttpSession session)
      throws Exception {
    String path = session.getServletContext().getRealPath("images");
    for (MultipartFile img : imgs1) {
      uploadFile(path, img);
    }
    for (MultipartFile img : imgs2) {
      uploadFile(path, img);
    }
    for (MultipartFile img : imgs3) {
      uploadFile(path, img);
    }
    return "/success.jsp";
  }

  private void uploadFile(String path, MultipartFile img) throws IOException {
    if (img.getSize() > 0) {
      String fileName = img.getOriginalFilename();
      if (fileName.endsWith("jpg") || fileName.endsWith("png")) {
        File file = new File(path, fileName);
        img.transferTo(file);
      }
    }
  }
}

String getContentType()//獲取文件MIME類型
InputStream getInputStream()//獲取文件流
String getName() //獲取表單中文件組件的名字
String getOriginalFilename() //獲取上傳文件的原名
long getSize() //獲取文件的字節(jié)大小，單位byte
boolean isEmpty() //是否為空
void transferTo(File dest)