Spring MVC实现文件上传

依赖jar包：

commons-io

commons-fileupload

commons-lang

Spring MVC配置文件中配置MultipartResolver:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd">

<!-- 配置MultipartResolver，用于上传文件，使用Spring的CommonsMultipartResolver -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="maxInMemorySize" value="5000000"></property><!-- 文件上传大小，字节为单位 -->
<property name="defaultEncoding" value="UTF-8"></property><!-- 请求的编码格式，需与jsp的pageEncoding一致 -->
</bean>
</beans>

前端form表单添加enctype="multipart/form-data"

页面添加：

</div>
<div>
<input type="hidden" id="errorinfo_lic" value="${uploadlicError }"/>
<label for="companyLicPicPath">企业营业执照存储路径</label>
<input type="file" name="attachs" id="companyLicPicPath"/>
<font color="red"></font>
</div>
<div>
<input type="hidden" id="errorinfo_Code" value="${uploadCodeError }"/>
<label for="orgCodePicPath">组织机构代码证照片</label>
<input type="file" name="attachs" id="orgCodePicPath"/>
<font color="red"></font>
</div>

控制器：

/**
* 保存供应商信息
*
* @param provider
* @param session
* @return
* 文件上传流程：Spring MVC会将上传文件绑定到MultipartFile对象中，MultipartFile提供了获取上传文件内容、文件名等
* 最后通过其transferTo()方法将文件存储到服务器上
*/

@RequestMapping("addProviderSave")
public String addProviderSave(
Provider provider,
HttpSession session,
HttpServletRequest request,//MultipartFile对象作为控制器处理方法的入参，数组必须加@RequestParam注解
@RequestParam(value = "attachs", required = false) MultipartFile[] attachs) {
String companyLicPicPath = null;//
String orgCodePicPath = null;
String errorinfo = null;
boolean flag = true;
String path = request.getSession().getServletContext()//文件上传的目标路径（服务器），File.separator自适应路径分隔符
.getRealPath("statics" + File.separator + "uploadFiles");
for (int i = 0; i < attachs.length; i++) {
MultipartFile attach = attachs[i];
if (!attach.isEmpty()) {//判断是否有文件上传
if (i == 0) {//数组里的文件对象是按照是按照form表单的file标签顺序进行存储的
errorinfo = "uploadlicError";
} else if (i == 1) {
errorinfo = "uploadcodeError";
}
String oldFileName = attach.getOriginalFilename();// 原文件名
String prefix = FilenameUtils.getExtension(oldFileName);// 后缀
int fileSize = 500000;
if (attach.getSize() > fileSize) {
request.setAttribute(errorinfo, "上传大小不得超过500KB");
flag = false;
} else if (prefix.equalsIgnoreCase("jpg")
|| prefix.equalsIgnoreCase("png")
|| prefix.equalsIgnoreCase("jpeg")
|| prefix.equalsIgnoreCase("pneg")) {
//当前系统时间+随机数+_personal.jpg，保证不会重复
String fileName=
4000
System.currentTimeMillis()+RandomUtils.nextInt(0,1000000)+"_personal.jpg";
File targetFile=new File(path,fileName);
if(!targetFile.exists()){
targetFile.mkdirs();
}
//保存
try {
attach.transferTo(targetFile);//把MultipartFile中文件流的数据输出至目标文件夹
} catch (IllegalStateException e) {
e.printStackTrace();
request.setAttribute(errorinfo, "上传失败");
flag=false;
} catch (IOException e) {
e.printStackTrace();
}
if(i==0){
companyLicPicPath=fileName;//数据库中存储文件名
}else if(i==1){
orgCodePicPath=fileName;
}
}else {
request.setAttribute(errorinfo, "上传图片格式不正确");
flag=false;
}
}
}
if (flag) {
provider.setCreatedBy(((User) session
.getAttribute(Constants.USER_SESSION)).getId());
provider.setCreationDate(new Date());
provider.setCompanyLicPicPath(companyLicPicPath);
provider.setOrgCodePicPath(orgCodePicPath);
try {
if (providerService.addProvider(provider) > 0) {
return "redirect:/providerController/providerList";
}
} catch (Exception e) {
e.printStackTrace();
}
}
return "provideradd";
}

添加js,优化用户体验：

var companyLicPicPath=null;
var orgCodePicPath=null;
var errorinfo_lic=null;
var errorinfo_Code=null;
$(function(){
companyLicPicPath=$("#companyLicPicPath");
orgCodePicPath=$("#orgCodePicPath");
errorinfo_lic=$("#errorinfo_lic");
errorinfo_Code=$("#errorinfo_Code");
if(errorinfo_lic.val()==null||errorinfo_lic.val()==""){
companyLicPicPath.next().html("*上传文件类型必须是jpg、jpeg、png、pneg*");
}else{
companyLicPicPath.next().html(errorinfo_lic.val());
}
if(errorinfo_Code.val()==null||errorinfo_Code.val()==""){
orgCodePicPath.next().html("*上传文件类型必须是jpg、jpeg、png、pneg*");
}else{
orgCodePicPath.next().html(errorinfo_Code.val());
}

});