文件上传
依赖于Apache提供的两个jar
commons-io
commons-fileupload
基于SpringMVC的方式
1.配置一个文件解析器 CommonsMultipartResolver
2.自己写一个Controller
方法内部像之前一样接收参数即可
文件参数MultipartFile类型 变量名与前面的key一致
3.用MultipartFile对象做文件的传输
transferTo(new File("上传路径"))
基于SpringMVC的文件上传流程.jpg
前端页面index.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>$Title$</title>
</head>
<body>
<a href="test.do">测试一下</a><br>
<form action="upload.do" method="post" enctype="multipart/form-data">
<input type="text" name="text" value=""><br>
<input type="file" name="upload"><br>
<input type="submit" value="upload">
</form>
</body>
</html>
TestController上传处理
package controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;
import java.io.File;
import java.io.IOException;
@Controller
public class TestController {
@RequestMapping("test.do")
public String test(){
System.out.println("test好用啦");
return "welcome.jsp";
}
//原生方式处理文件的上传
// @RequestMapping("upload.do")
// public String upload(HttpServletRequest request) throws Exception {
// //获取磁盘文件选项的factory
// DiskFileItemFactory factory = new DiskFileItemFactory();
// //创建一个ServletFileUpload对象
// ServletFileUpload upload = new ServletFileUpload(factory);
// //让upload对象帮我们去解析request(目的获取数据)
// List<FileItem> itemList = upload.parseRequest(request);
// //遍历所有的文件项
// for(FileItem item : itemList){
// //每次循环判断一下当前item是文件还是普通表单对象
// if(item.isFormField()){//普通表单数据
// String key = item.getFieldName();
// String value = item.getString("UTF-8");
// System.out.println(key+"--"+value);
// }else{//文件数据
// String fileName = item.getName();//名字可以自己弄一个规则 确保文件名唯一 UUID
// item.write(new File("D://test//",fileName));
// }
// }
// return "welcome.jsp";
// }
//文件上传的时候需要一个临时存储
//factory.setSizeThreshold(1024000);//设置缓存大小
//factory.setRepository(new File("路径"));
@RequestMapping("upload.do")
public String upload(String text, MultipartFile upload) throws IOException {
System.out.println("新的controller执行啦");
System.out.println(text);
//文件名字
String fileName = upload.getOriginalFilename();
//文件对象
//upload对象帮我们做传输
upload.transferTo(new File("D://test//",fileName));
return "welcome.jsp";
}
}
ApplicationContext.xml 在spring中注册bean 配置文件解析器
CommonsMultipartResolver
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
https://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
https://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
https://www.springframework.org/schema/mvc/spring-mvc.xsd">
<context:component-scan base-package="controller"></context:component-scan>
<mvc:annotation-driven></mvc:annotation-driven>
<!--配置文件解析器-->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!--设置读取文件的缓存大小-->
<property name="maxUploadSize" value="10240000"></property>
</bean>
</beans>
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<filter>
<filter-name>characterEncoding</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>characterEncoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<servlet>
<servlet-name>mvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:ApplicationContext.xml</param-value>
</init-param>
<load-on-startup>0</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>mvc</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
</web-app>
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