springmvc学习(六)：上传文件

一、修改web.xml

增加这一行，表示允许访问图片

    <servlet-mapping>
        <servlet-name>defaultservlet-name>
        <url-pattern>*.jpgurl-pattern>
    servlet-mapping>

二、修改配置文件

增加这一句，表示开方上传功能

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

三、外层添加upload.jsp页面

访问的入口页面

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8" import="java.util.*" isELIgnored="false"%>

<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>

四、pojo添加文件类

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;
    }

}

五、添加控制器

package controller;

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

import javax.servlet.http.HttpServletRequest;

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;
    }
}

六、showUploadedFile页面

放在page下

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8" isELIgnored="false"%>

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