ssm框架下实现文件上传

1、由于ssm框架是使用Maven进行管理的,文件上传所需要的jar包利用pom.xml进行添加,如下所示:

<properties>
    <commons-fileupload.version>1.3.1</commons-fileupload.version>
    <commons-io.version>2.4</commons-io.version>
</properties>

<dependencies>
    <dependency>
      <groupId>commons-io</groupId>
      <artifactId>commons-io</artifactId>
      <version>${commons-io.version}</version>
    </dependency>

    <dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>${commons-fileupload.version}</version>
      <exclusions>
        <exclusion>
          <groupId>commons-io</groupId>
          <artifactId>commons-io</artifactId>
        </exclusion>
      </exclusions>
    </dependency>
</dependencies>

具体配置可以参考eclipse下利用maven搭建ssm环境

2、spring-mvc.xml配置

<!-- 定义文件上传解析器 -->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!-- 设定默认编码 -->
        <property name="defaultEncoding" value="UTF-8" />
        <!-- 设定文件上传的最大值5MB,5*1024*1024 -->
        <property name="maxUploadSize" value="5242880" />
        <property name="maxInMemorySize" value="4096" />
    </bean>

3、文件上传页面fileupload.jsp(比较简陋,仅用于测试是否上传成功)
代码目录如下:
这里写图片描述
代码如下:

<%--
  Created by IntelliJ IDEA.
  User: 87035
  Date: 2017/8/31
  Time: 13:56
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>file upload</title>
</head>
<body>
    <form action="./file/fileupload.do" method="post" enctype="multipart/form-data">
        <label>文件上传</label>
        <input type="file" name="file">
        <input type="submit" value="提交">
    </form>
</body>
</html>

注:form表单中的enctype=”multipart/form-data“必不可少,否则提交会报The current request is not a multipart request,具体可见The current request is not a multipart request

4、在controller层写上springmvc上传的代码
代码如下:

package com.NQ.managesystem.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

@Controller
@RequestMapping("/file")
public class FileUploadUtils {
    @RequestMapping("/fileupload.do")
    public @ResponseBody  String upload(MultipartFile file, HttpServletRequest request) throws IOException {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmssSS");
        String res = sdf.format(new Date());

        // uploads文件夹位置
        String rootPath = request.getSession().getServletContext().getRealPath("resource/uploads/");
        // 原始名称
        String originalFileName = file.getOriginalFilename();
        // 新文件名
        String newFileName = "sliver" + res + originalFileName.substring(originalFileName.lastIndexOf("."));
        // 创建年月文件夹
        Calendar date = Calendar.getInstance();
        File dateDirs = new File(date.get(Calendar.YEAR) + File.separator + (date.get(Calendar.MONTH)+1));

        // 新文件
        File newFile = new File(rootPath + File.separator + dateDirs + File.separator + newFileName);
        // 判断目标文件所在目录是否存在
        if( !newFile.getParentFile().exists()) {
            // 如果目标文件所在的目录不存在,则创建父目录
            newFile.getParentFile().mkdirs();
        }
        System.out.println(newFile);
        // 将内存中的数据写入磁盘
        file.transferTo(newFile);
        // 完整的url
        String fileUrl = date.get(Calendar.YEAR) + "/" + (date.get(Calendar.MONTH)+1) + "/" + newFileName;
        return  fileUrl;
    }
}

5、访问地址http://localhost:8381/njql/fileupload.jsp(端口号更改为本地tomcat的端口号)
这里写图片描述

点击提交,如果显示图片地址,这时候可以看到项目目录\src\main\webapp下新增resources文件夹,里面存放了刚刚上传的图片,至此上传功能实现完毕

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转载自blog.csdn.net/mxw968/article/details/77747354
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