小贴士，eclipse中复制一份已有的项目
1.copy,改名
2.右键---properties----web Project Settings—更改访问路径Context root写入新的文件名
一、单个文件上传
1）jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<%
pageContext.setAttribute("ctp", request.getContextPath());
%>
</head>
<body>
<!--
文件上传
1.写表单；：enctype="multipart/form-data"
2.导入fileuplod包
commons-fileupload-1.2.1.jar
commons-io-2.0.jar
3.javaweb.......
3.现在用框架
只需要在springmvc配置文件中，编写一个文件上传解析器MultiPartResolver九大组件之一
4.文件上传请求处理写Controller
-->
<!-- action最好写全路径 -->
${msg }
<!-- 取一下model保存的提示信息 -->
<form action="${ctp }/upload" method="post" enctype="multipart/form-data">
用户头像：<input type="file" name="headerimg"/><br/>
用户名：<input type="text" name="username"/><br/>
<input type="submit"/>
</form>
</body>
</html>
2）springmvc.xml
编写一个文件上传解析器MultiPartResolver九大组件之一，其余配置都是标配
<context:component-scan base-package="com.atguigu"></context:component-scan>
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/pages/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
<!-- 配置文件上传解析器MultiPartResolver接口，用CommonsMultipartResolver实现类
id必须是multipartResolver
-->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="maxUploadSize" value="#{1024*1024*20}"></property>
<property name="defaultEncoding" value="UTF-8"></property>
</bean>
<mvc:default-servlet-handler/>
<mvc:annotation-driven ></mvc:annotation-driven>
3）Controller
@Controller
public class FileUploadController {
@RequestMapping("/upload")
public String upload(@RequestParam(value="username",required = false)String username,
@RequestParam("headerimg")MultipartFile file,
Model model) {
System.out.println("上传文件的信息");
System.out.println("文件的名字："+file.getName());//假名（jsp文件项的<name=“”>）
System.out.println("文件的名字："+file.getOriginalFilename());//真名
//文件保存
try {
file.transferTo(new File("G:\\"+file.getOriginalFilename()));
model.addAttribute("msg","文件上传成功了");
} catch (Exception e) {
// TODO Auto-generated catch block
model.addAttribute("msg","文件上传失败了"+e.getMessage());
}
//懒得再写新的jsp了
return "forward:/index.jsp";
}
}
二、多个文件上传
1)jsp里多写几个<input type="file" name="headerimg"/><br/>
2)Controller
@Controller
public class FileUploadController {
@RequestMapping("/upload")
public String upload(@RequestParam(value="username",required = false)String username,
@RequestParam("headerimg")MultipartFile[] file,
Model model) {
对MultipartFile[] file增强型for循环
同上
//懒得再写新的jsp了
return "forward:/index.jsp";
}
}