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                ## **upload** 使用前提 ~~~ enctype="multipart/form-data" method="post" ~~~ 1. 創建一個 磁盤文件項目工廠 ~~~ DiskFileItemFactory factory = new DiskFileItemFactory() ~~~ 2. 指定一個臨時目錄(緩沖區) ~~~ getServletContext().getRealPath("temp"); ~~~ 3. 設置緩沖區參數 ~~~ setSizeThreshold(1024*1024);設置大小 setRepository(File);指定緩沖區的位置 ~~~ 4. 創建上傳文件的核心類 ~~~ ServletFileUpload upload = new ServletFileUpload(DiskFileItemFactory) ~~~ 5. 處理上傳文件 ~~~ setHeaderEncoding("utf-8") isMultipartContent(request)判斷是否是上傳文件操作 ~~~ 6. 解析請求 ~~~ parseRequest(request) 返回List<FileItem> ~~~ 7. 遍歷表單每個字段 ~~~ isFormField() 判斷是否是普通表單字段 getFielName() 獲得字段name值 getString("utf-8") 獲得字段value值并轉碼 getName() 獲得要上傳文件的名稱 getInputStream()通過輸入流拿到數據 write(File)文件上傳到的位置 ~~~ 8. 關閉資源,關閉流,清除緩存區臨時文件 ~~~ delete();清空緩存區的臨時文件 ~~~
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