SpringMvc MultipartFile实现图片文件上传示例

整理文档，搜刮出一个SpringMvc MultipartFile实现图片文件上传示例，稍微整理精简一下做下分享。

spring-servlet.xml

<!-- SpringMVC上传文件时，需要配置MultipartResolver处理器 -->
  <bean id="multipartResolver"
    class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <property name="defaultEncoding" value="UTF-8" />
    <!-- 指定所上传文件的总大小,单位字节。注意maxUploadSize属性的限制不是针对单个文件，而是所有文件的容量之和 -->
    <property name="maxUploadSize" value="10240000" />
  </bean>

upload/index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>单图片上传</title>
</head>
<body>
<fieldset>
<legend>图片上传</legend>
<h2>只能上传单张10M以下的 PNG、JPG、GIF 格式的图片</h2>
<form action="/shop/auth/photoUpload" method="post" enctype="multipart/form-data">
  选择文件:<input type="file" name="file">
  <input type="submit" value="上传">
</form>
</fieldset>
</body>
</html>

或者使用ExtJs

js/user/photoUpload.js

Ext.onReady(function(){
  Ext.create('Ext.form.Panel', {
    title: '图片上传',
    width: 600,
    bodyPadding: 10,
    frame: true,
    renderTo: Ext.getBody(),
    items: [{
      xtype: 'filefield',
      name: 'file',
      fieldLabel: 'Photo',
      labelWidth: 50,
      msgTarget: 'side',
      fileUpload: true ,
      allowBlank: false,
      blankText:"Select an image",
      emptyText: 'You can only upload a single PNG 10M or less, JPG, GIF format images',
      anchor: '100%',
      buttonText: '选择图片'
    }],

    buttons: [{
      text: '上传',
      handler: function() {
        var form = this.up('form').getForm();
        if(form.isValid()){
          form.submit({
            url: '/shop/auth/photoUpload',
            waitMsg: '正在上传图片...',
            success: function(fp, o) {
              Ext.Msg.alert('提示', o.result.msg);
            }
          });
        }
      }
    }]
  });
});

pages/user/photoUpload.html

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>图片上传</title>
</head>
<link href="../../ext-4.2.1.883/resources/css/ext-all.css" rel="external nofollow" rel="stylesheet"
  type="text/css" />
<script type="text/javascript" src="../../ext-4.2.1.883/ext-all.js"></script>
<script src="../../js/user/photoUpload.js" type="text/javascript"></script>
<body>

</body>
</html>

AuthController.java

/**
   * 图片文件上传
   */
  @ResponseBody
  @RequestMapping(value = "/photoUpload",method = RequestMethod.POST)
  public ResultData<Object> photoUpload(MultipartFile file,HttpServletRequest request,HttpServletResponse response,HttpSession session) throws IllegalStateException, IOException{
    ResultData<Object> resultData=new ResultData<>();
    // 判断用户是否登录
    /*User user=(User) session.getAttribute("user");
    if (user==null) {
      resultData.setCode(40029);
      resultData.setMsg("用户未登录");
      return resultData;
    }*/
    if (file!=null) {// 判断上传的文件是否为空
      String path=null;// 文件路径
      String type=null;// 文件类型
      String fileName=file.getOriginalFilename();// 文件原名称
      System.out.println("上传的文件原名称:"+fileName);
      // 判断文件类型
      type=fileName.indexOf(".")!=-1?fileName.substring(fileName.lastIndexOf(".")+1, fileName.length()):null;
      if (type!=null) {// 判断文件类型是否为空
        if ("GIF".equals(type.toUpperCase())||"PNG".equals(type.toUpperCase())||"JPG".equals(type.toUpperCase())) {
          // 项目在容器中实际发布运行的根路径
          String realPath=request.getSession().getServletContext().getRealPath("/");
          // 自定义的文件名称
          String trueFileName=String.valueOf(System.currentTimeMillis())+fileName;
          // 设置存放图片文件的路径
          path=realPath+/*System.getProperty("file.separator")+*/trueFileName;
          System.out.println("存放图片文件的路径:"+path);
          // 转存文件到指定的路径
          file.transferTo(new File(path));
          System.out.println("文件成功上传到指定目录下");
        }else {
          System.out.println("不是我们想要的文件类型,请按要求重新上传");
          return null;
        }
      }else {
        System.out.println("文件类型为空");
        return null;
      }
    }else {
      System.out.println("没有找到相对应的文件");
      return null;
    }
    return resultData;
  }

ResultData.java 代码如下:

public class ResultData<T> {
 private T data;
 private int code =200;
 private String msg;
 private Boolean success = true;
 public Boolean getSuccess() {

 return success;

 }
 public void setSuccess(Boolean success) {

 this.success = success;

 }
 public T getData() {

 return data;

 }
 public void setData(T data) {

 this.data = data;

 }
 public int getCode() {

 return code;

 }
 public void setCode(int code) {

 if(200 != code){

  success = false;

 }

 this.code = code;

 }
 public String getMsg() {

 return msg;

 }
 public void setMsg(String msg) {

 this.msg = msg;

 }
}

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