springmvc上传文件-优快云博客

本文介绍了一个使用Spring MVC框架实现的文件上传功能，包括web.xml配置、控制器代码、上传页面及展示上传文件的处理流程。

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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">
    <servlet-mapping>
        <servlet-name>default</servlet-name>
        <url-pattern>*.jpg</url-pattern>
    </servlet-mapping>

    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>
            org.springframework.web.servlet.DispatcherServlet
        </servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

</web-app>

springmvc-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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-3.0.xsd">

    <context:component-scan base-package="controller"/>

    <bean id="viewResolver"
          class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/page/" />
        <property name="suffix" value=".jsp" />
    </bean>

    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>
</beans>

UploadedImageFile.java

package pojo;

import org.springframework.web.multipart.MultipartFile;

public class UploadedImageFile {
    MultipartFile image;

    public MultipartFile getImage() {
        return image;
    }

    public void setImage(MultipartFile image) {
        this.image = image;
    }

}

UploadController.java

package controller;

import java.io.File;
import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang.xwork.RandomStringUtils;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import pojo.UploadedImageFile;

@Controller
public class UploadController {

    @RequestMapping("/uploadImage")
    public ModelAndView upload(HttpServletRequest request, UploadedImageFile file)
            throws IllegalStateException, IOException {
        String name = RandomStringUtils.randomAlphanumeric(10);
        String newFileName = name + ".jpg";
        File newFile = new File(request.getServletContext().getRealPath("/image"), newFileName);
        newFile.getParentFile().mkdirs();
        file.getImage().transferTo(newFile);

        ModelAndView mav = new ModelAndView("showUploadedFile");
        mav.addObject("imageName", newFileName);
        return mav;
    }

    @RequestMapping("/upload")
    public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
        ModelAndView mav = new ModelAndView("upload");
        return mav;
    }

}

upload.jsp

<%--
  Created by IntelliJ IDEA.
  User: Think
  Date: 2019/11/6
  Time: 13:33
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Upload</title>
</head>
<body>

<form action="uploadImage" method="post" enctype="multipart/form-data">
    选择图片:<input type="file" name="image" accept="image/*" /> <br>
    <input type="submit" value="上传">
</form>

</body>
</html>

showUploadedFile.jsp

<%--
  Created by IntelliJ IDEA.
  User: Think
  Date: 2019/11/6
  Time: 13:48
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>ShowUploadedFile</title>
</head>
<body>

<img src="image/${imageName}"/>

</body>
</html>