SpringMvc下的文件上传

首先是springmvc.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" xmlns:p="http://www.springframework.org/schema/p"
       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-4.0.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">


    <!-- 配置自动扫描的包 -->
    <context:component-scan base-package="springmvc"></context:component-scan>

    <!-- 配置视图解析器 如何把handler 方法返回值解析为实际的物理视图 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name = "prefix" value="/WEB-INF/"></property>
        <property name = "suffix" value = ".jsp"></property>
    </bean>

    <!-- 支持上传文件 -->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>

</beans>

重点是最后的配置multipartResolver；其次有一个坑就是网上部分教程没告诉我们要引入两个必须的jar包common-fileupload和common-io。

还有一点是form表单中的enctype="multipart/form-data"属性记得配置。

下面是创建目录和文件以及展示上传页面的代码：

package springmvc.action;

/**
 * Created by alden on 2017/1/3.
 */

import java.io.File;
import java.util.Date;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;

@Controller
@RequestMapping("/Upload")
public class UploadController {
    //上传界面
    @RequestMapping("/UploadPage")
    public String UploadPage() {
        return "Upload/UploadFile";
    }

    @RequestMapping(value = "/UploadFile")
    public String upload(@RequestParam(value = "file", required = false) MultipartFile file, HttpServletRequest request, ModelMap model) {

        System.out.println("开始");
        String path = request.getSession().getServletContext().getRealPath("upload");
        String fileName = file.getOriginalFilename();
//        String fileName = new Date().getTime()+".jpg";
        System.out.println(path);
        File targetFile = new File(path, fileName);
        if (!targetFile.exists()) {
            targetFile.mkdirs();
        }

        //保存
        try {
            file.transferTo(targetFile);
        } catch (Exception e) {
            e.printStackTrace();
        }
        model.addAttribute("fileUrl", request.getContextPath() + "/upload/" + fileName);

        return "Upload/Result";
    }

}