SpringMVC和Struts2的区别
共同点：
1.都是web层框架，都是基于MVC模型编写
2.底层都离不开原始ServletAPI
3.处理请求的机制都是一个核心控制器
区别：
1.SpringMVC的入口是Servlet，而Struts2是Filter
2.SpringMVC是基于方法设计的，而Struts2是基于类，Struts2每次执行都会创建一个动作类。所以SpringMVC会稍微比Struts2快些
3.SpringMVC使用更加简洁，同时还支持JSR303,处理ajax请求更方便
搭建SpringMVC工程步骤
最后一步最重要，我踩过多少坑才知道
fix完之后，tomcat服务器就可以跑起来了，不需要敲一行代码，也不需要配置代码
下面是正题
效果图
index.jsp
<%-- Created by IntelliJ IDEA. User: wanglei Date: 2019/7/27 Time: 14:59 To change this template use File | Settings | File Templates. --%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>$Title$</title>
</head>
<body>
<h3>传统文件上传</h3>
<form action="user/fileupload1" method="post" enctype="multipart/form-data"> 选择文件：<input type="file" name="upload"/><br/>
<input type="submit" value="上传"/>
</form>
<h3>SpringMVC文件上传</h3>
<form action="user/fileupload2" method="post" enctype="multipart/form-data"> 选择文件：<input type="file" name="upload"/><br/>
<input type="submit" value="上传"/>
</form>
<h3>跨服务器文件上传</h3>
<form action="user/fileupload3" method="post" enctype="multipart/form-data"> 选择文件：<input type="file" name="upload"/><br/>
<input type="submit" value="上传"/>
</form>
</body>
</html>
dispatcher-servlet.xml
<?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 http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!--开启注解扫描-->
<context:component-scan base-package="com.jinke.controller"/>
<!--视图解析器对象-->
<bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/pages/"/>
<property name="suffix" value=".jsp"/>
</bean>
<!--配置文件解析器对象-->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="maxUploadSize" value="10485760"/>
</bean>
<!--开启SpringMVC框架注解的支持-->
<mvc:annotation-driven/>
</beans>
UploadController.java
import com.sun.jersey.api.client.Client; import com.sun.jersey.api.client.WebResource; import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.multipart.MultipartFile; import javax.servlet.http.HttpServletRequest; import java.io.File; import java.util.List; import java.util.UUID; @Controller @RequestMapping("/user") public class UploadController { /** * 跨服务器上传方式 * * @return * @throws Exception */ @RequestMapping("/fileupload3") public String fileupload3(MultipartFile upload) throws Exception { System.out.println("跨服务器文件上传..."); //定义上传服务器路径
String path = "http://localhost:9090/Fileserver/uploads/"; //上传文件项
String filename = upload.getOriginalFilename(); String uuid = UUID.randomUUID().toString().replace("-", ""); String saveName = uuid + "_" + filename.substring(filename.lastIndexOf(File.separator) + 1); //创建客户端对象
Client client = Client.create(); //和图片服务器进行连接
WebResource webResource = client.resource(path + saveName); //上传文件
webResource.put(upload.getBytes()); return "success"; } /** * SpringMVC上传方式 * * @param request * @return * @throws Exception */ @RequestMapping("/fileupload2") public String fileupload2(HttpServletRequest request, MultipartFile upload) throws Exception { System.out.println("springmvc文件上传..."); //上传的位置
String path = request.getSession().getServletContext().getRealPath("/uploads/"); //判断该路径是否存在
File file = new File(path); if (!file.exists()) { file.mkdirs(); } //上传文件项
String filename = upload.getOriginalFilename(); String uuid = UUID.randomUUID().toString().replace("-", ""); String saveName = uuid + "_" + filename.substring(filename.lastIndexOf(File.separator) + 1); upload.transferTo(new File(path, saveName)); return "success"; } /** * 传统上传方式 * * @param request * @return * @throws Exception */ @RequestMapping("/fileupload1") public String fileupload1(HttpServletRequest request) throws Exception { System.out.println("文件上传..."); //上传的位置
String path = request.getSession().getServletContext().getRealPath("/uploads/"); //判断该路径是否存在
File file = new File(path); if (!file.exists()) { file.mkdirs(); } //解析request对象
DiskFileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload upload = new ServletFileUpload(factory); List<FileItem> items = upload.parseRequest(request); //遍历
for (FileItem item : items) { if (item.isFormField()) { //普通表单向
} else { //上传文件项
String filename = item.getName(); String uuid = UUID.randomUUID().toString().replace("-", ""); String saveName = uuid + "_" + filename.substring(filename.lastIndexOf(File.separator) + 1); item.write(new File(path, saveName)); //删除临时文件
item.delete(); } } return "success"; } }
需要注意的是，如果配置了CommonsMultipartResolver，传统上传方式就走不通了，因为提前过滤掉了
如果从应用服务器上传文件到文件服务器，保存路径要写对
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