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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