SpringMVC使用MultipartFile 实现异步上传方法介绍

时间:2021-08-07 12:57:24

目的是实现异步上传

1.添加pom依赖

添加pom依赖,因为用的ajax,数据需要转成json的格式进行传输,所以还有加入一个JSON jar包:

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<dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>1.3.1</version>
    </dependency>
    <dependency>
      <groupId>commons-logging</groupId>
      <artifactId>commons-logging</artifactId>
      <version>1.2</version>
    </dependency>
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>fastjson</artifactId>
      <version>1.1.37</version>
    </dependency>

2.修改配置文件

applicationContext.xml里面需要加上:

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<bean id="multipartResolver"
    class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <property name="defaultEncoding" value="UTF-8"></property>
    <property name="maxUploadSize" value="5400000"></property>
  </bean>

3.前端页面上

前端页面:

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<form id="uploadForm" name="uploadForm"
    enctype="multipart/form-data">
<input name="messageContent" value="多个参数的情况下">
      <label>文件</label> <input type="file" name="file">
      <button class="btn" type="button" id="doSave">提交</button>
  </form>
</body>
</html>

需要加入的JS:

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<script type="text/javascript" src="js/jquery-1.6.2.min.js"></script>
<script type="text/javascript" src="js/jquery-ui.min.js"></script>
<script type="text/javascript" src="js/jquery.form.js"></script>

JS方法:

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<script>
  $(function() {
    $("#doSave")
        .click(
            function() {
              $("#uploadForm")
                  .ajaxSubmit(
                      {
                type : 'post',
                url : "/tmpInfo/method2.do",
    //data: //注意只要是写在表单里面的,都不需要加这个属性。在controller中可以根据@RequestParam String str获取到属性值。 
  contentType : "application/x-www-form-urlencoded; charset=utf-8",
    success: function(data) {
         //接受到的data还只是一个字符串,需要转成json对象
         var obj = JSON.parse(data);
         if(obj.flag==true){
          alert("上传成功");
       }else{
         alert("error");
       }
        },
        error: function (data)//服务器响应失败处理函数
        {
          alert("出错");
        }
       });
  });
  });

controller代码:

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@RequestMapping("/method2")
   @ResponseBody
   public String method2(@RequestParam MultipartFile file,
       @RequestParam String messageContent ) {
       //多个参数的话只要多个@RequestParam即可,注意参数名要和表单里面的属性名一致
    JSONObject json =new JSONObject();
    System.out.println(messageContent);
     String orgiginalFileName = "";
     int m =new Random().nextInt(100)+10;
     System.out.println("m="+m);
     String path="D:/"+m+"b.txt";
     try {
       File newFile =new File(path);
       file.transferTo(newFile);
       String fileName = file.getName();
       InputStream inputStream = file.getInputStream();
       String content = file.getContentType();
       orgiginalFileName = file.getOriginalFilename();
       System.out.println("fileName: "+fileName+", inputStream: "+ inputStream
             +"\r\n content: "+content+", orgiginalFileName: ="+ orgiginalFileName
             +"\r\n projectName: ");  
     } catch (IOException e) {
       e.printStackTrace();
     }
     json.put("flag", true);
     json.put("message", "success");
     System.out.println(json.toJSONString());
     return json.toJSONString();
   }

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原文链接:http://blog.csdn.net/foolishandstupid/article/details/52047514