Springmvc文件上传
目录
- Springmvc文件上传
- 依赖的jar包
- web.xml相关配置
- springmvc核心配置文件
- 单文件上传
- controller层Java代码
- 相关jsp代码:upload.jsp
- 多文件批量上传
- controller层Java代码
- 相关jsp代码:batchUpload.jsp
- index.jsp
- 项目结构
Springmvc文件上传
依赖的jar包
commons-io
commons-upload
Spring 核心依赖包：bean context aop context core web webmvc expression
web.xml相关配置
<?xml version="1.0" encoding="UTF-8"?>
springmvc_upload
characterencoding
org.springframework.web.filter.CharacterEncodingFilter
encoding
UTF-8
forceEncoding
true
characterencoding
*.do
upload
org.springframework.web.servlet.DispatcherServlet
contextConfigLocation
classpath:mvc.xml
1
upload
*.do
注意点：
- springmvc的核心配置文件一定在DispatcherServlet处配置其具体位置，而不是
映射的虚拟路径可以是"/"、"/"、".do"等，但是不要写成"/*.do"
springmvc核心配置文件
<?xml version="1.0" encoding="UTF-8"?>
注意点：
- 上传的文件大小不得超过文件解析器中maxUploadSize设置的大小，否则会报错
- 若是在web.xml的url-pattern中设置如/拦截了静态资源，可在此处添加类似
单文件上传
controller层Java代码
@Controller
public class UploadCtrl {
@RequestMapping("/toUpload.do")
public String toUpload() {
return "upload";
}
@RequestMapping("/upload.do")
public ModelAndView upload(HttpServletRequest req,@RequestParam("file")CommonsMultipartFile file) {
String path = req.getServletContext().getRealPath("/upload");
String name = file.getOriginalFilename();
System.out.println("文件名："+name);
InputStream is = null;
OutputStream os = null;
try {
is = file.getInputStream();
os = new FileOutputStream(new File(path,name));
byte[] bytes = new byte[1024];
int len =0;
while((len=is.read(bytes))!=-1) {
os.write(bytes,0,len);
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
try {
if(is!=null)
is.close();
if(os!=null)
os.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return new ModelAndView("index");
}
注意点：
- CommonsMultipartFile file处必须使用注解@RequestParam("file")为其注入请求中的file属性值，否则CommonsMultipartFile会自己去尝试初始化file，从而报错（找不到CommonsMultipartFile的file值）
- 通过 "String path = req.getServletContext().getRealPath("/upload");" 将"/upload"这个虚拟路径映射为webcontent下的真实路径。
相关jsp代码:upload.jsp
多文件批量上传
controller层Java代码
@RequestMapping("/toBatchUpload.do")
public String toBatchUpload() {
return "batchUpload";
}
@RequestMapping("/batchUpload.do")
public ModelAndView batchUpload(HttpServletRequest req,@RequestParam("file")CommonsMultipartFile[] file) {
String path = req.getServletContext().getRealPath("/upload");
String name = null;
InputStream is = null;
OutputStream os = null;
byte[] bytes = new byte[1024];
int len =0;
for (int i = 0; i < file.length; i++) {
try {
name = file[i].getOriginalFilename();
is = file[i].getInputStream();
System.out.println("文件名："+name);
os = new FileOutputStream(new File(path,name));
while((len=is.read(bytes))!=-1) {
os.write(bytes,0,len);
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
try {
if(is!=null)
is.close();
if(os!=null)
os.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
return new ModelAndView("index");
}
通过for循环，重复执行单文件上传代码
相关jsp代码:batchUpload.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
Home Page
<script src="${pageContext.request.contextPath }/js/jquery-2.1.0.min.js" type="text/javascript"></script>
<script type="text/javascript">
$("#add").click(function(){
var field = "选择文件：
";
$("#fileList").append(field);
});
function del(obj){
$(obj).parent().remove();
};
</script>
index.jsp
上传成功
注意点：
- jquery的基本语法就是以function，所以del()函数需要单独定义，而不能将其嵌套在$().ready里面。总结起来就是，使用时可嵌套，但是定义时不可嵌套
- enctype="multipart/form-data"上传的文件类型不能忘了
项目结构
项目源码已上传至 github fileupload