修改文件上传功能的文档。
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		@@ -2,7 +2,7 @@
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 * @Author: Kane
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 * @Date: 2022-09-28 15:47:02
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 * @LastEditors: Kane
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 * @LastEditTime: 2022-10-09 10:44:45
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 * @LastEditTime: 2022-10-11 09:40:45
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 * @FilePath: \car_dealer\src\main\java\com\cpic\xim\car_dealer\controllers\fileupload\FileUploadController.java
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 * @Description: 用于实现跨域功能的过滤器对象。
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 * Copyright (c) ${2022} by Kane, All Rights Reserved. 
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@@ -13,7 +13,6 @@ package com.cpic.xim.car_dealer.controllers.fileupload;
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import java.io.File;
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import java.io.IOException;
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import java.nio.channels.IllegalSelectorException;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import org.springframework.context.annotation.Scope;
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@@ -27,19 +26,16 @@ import org.springframework.web.multipart.MultipartFile;
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@RequestMapping( path = "/upload")
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public class FileUploadController
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{
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    @RequestMapping( value = "/test.do")
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    public void test() throws ServletException, IOException
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    {
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        // PrintWriter writer = response.getWriter();
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        // writer.write( "测试!" );
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    }
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    /*****************************************************
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     * @param request
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     * @param response
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     * @param uploadFile
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     * @return FileUploadResult 
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     * 接收上传文件,并保存到临时目录:
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     * 1、临时目录下再用sessionID作为子目录保存文件。
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     * 2、保存时不更改文件名,会覆盖同名文件。
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     * 3、MultipartFile参数形参名称必须和请求form中file标签的name属性一致,否则值为null。
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     * 4、返回值为接收结果和文件保存路径。
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     * @param request 请求对象。
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     * @param response 响应对象。
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     * @param uploadFile 文件上传对象,形参名称要和请求参数中file标签的name属性一致,否则值为null。
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     * @return FileUploadResult 文件上传结果,会被转换成json。
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     *****************************************************/
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    @RequestMapping( path = "/upload_file.do")
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    @ResponseBody
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