x

   深夜，在東莞，7天酒店，開啟電腦，訪問國內最大的同性交友網站。

日常開發中，匯出匯入場景非常多，尤其是對於後臺管理更是一個列表一個匯出，如果從匯出的業務中抽離出複用程式碼，專注於邏輯開發，對於開發者而言非常重要。前有使用POI，但作者還是更喜EasyExcel的簡潔高效不拖沓，所以特意寫篇文章記錄下。

準備工作

準備工作是看檔案瞭解EasyExcel嗎？不，我們直接上手吧！我發現最近的業務裡面，最簡單的例子已經應付下來了！所以準備工作自然只需匯入EasyExcel的jar包，這裡我們由於是springboot專案，所以直接使用maven。直接上最新的版本了！pom.xml給它加上：

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<dependency>

      <groupId>com.alibaba</groupId>

      <artifactId>easyexcel</artifactId>

      <version>2.2.5</version>

</dependency>

匯出

準備工作已經完成，匯出開始，首先需要一個Bean類，匯出的欄位和Excel檔案的欄位一樣即可。@Data是用了lombok，@ExcelProperty則包含了Excel首行的名稱和欄位所在位置，從0開始，不能重複。

​x

@Data

public class ExportVo {

 @ExcelProperty(value = "名稱", index = 0)

 private String name;

​

 @ExcelProperty(value = "時間", index = 1)

 private Date time;

 @NumberFormat("#.##%")

 @ExcelProperty(value = "完成率", index = 2)

 private Float rate;

}

接下來是邏輯實現：

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 @PostMapping("/export")

 public void export(@RequestBody ExportDto dto, HttpServletResponse response)

     throws IOException {

  String fileName = "統計表";

  ExcelUtil.download(response, fileName, ExportVo.class,

      getExportVoList());

  }

​

 private List getExportVoList() {

  //  這裡主要是獲取List<ExportVo>內容，不提供實現了，需要說下注意點。

   1、匯出列表應該有時間之類的限制（例如最近一個月），避免匯出Excel過大，過大Excel一般採用分sheet匯出（尤其xls檔案，有65535條數限制）、分檔案打包匯出，上傳檔案伺服器非同步匯出，不可突破的最大匯出（限死5w條）。

   2、一來考慮資料庫查詢和記憶體壓力，二來分頁外掛可能存在最大頁數限制，所以較多條數時必須做分頁查詢，再組合List物件。

   3、一般從資料庫直接查出資料不滿足匯出欄位需要，有必要時需要做欄位轉換。

  }

匯出的處理類：

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public class ExcelUtil {

​

 public static void download(HttpServletResponse response, String fileName,

               Class cls, List dataList)

     throws IOException {

  response.setContentType("application/vnd.ms-excel");

  response.setCharacterEncoding("utf-8");

  String fname = URLEncoder.encode(fileName, "utf-8");

  response.setHeader("Content-disposition",

      "attachment;filename=" + fname + ExcelTypeEnum.XLSX.getValue());

​

  LongestMatchColumnWidthStyleStrategy longestMatchColumnWidthStyleStrategy =

      new LongestMatchColumnWidthStyleStrategy();

  EasyExcel.write(response.getOutputStream(), cls)

       .sheet("sheet1")

       .registerWriteHandler(longestMatchColumnWidthStyleStrategy)

​

       .doWrite(dataList);

  response.flushBuffer();

  }

啟動程式，使用postman試下，直接點Send的話會返回一堆亂碼，選擇Send and Download則可匯出Excel，不過檔名是URL編碼過的，這個檔名編碼問題在瀏覽器則不會存在。

匯入

匯入是為了減少人工錄入大量資料的煩惱，挺好的。

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 @Autowired

 private ImportService importService;

​

 @PostMapping("/import")

 public void import(

     @RequestParam(value = "file") MultipartFile file,

     @Min(1) @RequestParam("type") int type

  ) throws IOException {

  ImportQueryDto dto = new ImportQueryDto();

  dto.setType(type);

  // ImportDto是匯入對應類，UploadDataListener是處理類，邏輯處理服務需要以引數形式傳入

  EasyExcel.read(file.getInputStream(), ImportDto.class,

      new UploadDataListener(importService)).sheet().doRead();

  }

​

匯入Excel對應類，ExcelProperty對應匯入欄位的首部。

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@Data

public class ImportDto {

 @ExcelProperty("名稱")

 private String name;

 @ExcelProperty("數量")

 private Integer num;

}

匯入處理：

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public class UploadDataListener

    extends AnalysisEventListener<ImportDto> {

 //  一次匯入多少便入庫，避免大量入庫

 private static final int BATCH_COUNT = 50;

 //  存放匯入列表

 List<ImportDto> list = new ArrayList<>();

​

 private ImportService importService;

​

 public UploadDataListener(ImportService importService) {

  this.importService = importService;

  }

​

 @Override

 public void invoke(ImportDto importDto, AnalysisContext analysisContext) {

  list.add(importDto);

  if (list.size() >= BATCH_COUNT) {

   saveData();

   list.clear();

   }

  }

​

 @Override

 public void doAfterAllAnalysed(AnalysisContext analysisContext) {

  saveData();

  }

​

 private void saveData() {

  List<ImportModel> importModelList = new ArrayList<>();

  for (ImportDto dto : list) {

   ImportModel model = new ImportModel();

   model.setName(dto.getName());

   model.setNum(dto.getNum())

   importModelList.add(model);

   }

  importService.saveBatch(importModelList);

  }

​

}

​

實際上，匯入檔案的內容是需要校驗的，資料格式校驗等，需要詢問產品是否忽略錯誤的資料，只匯入正常的資料，然後怎麼友好提示錯誤的內容，通過返回一個包含錯誤資訊Excel或提示框，更進一步的提示，則是提示到哪一個格子有問題。

睡覺。

figure:last-child { margin-bottom: 0.5rem; }
#write ol, #write ul { position: relative; }
img { max-width: 100%; vertical-align: middle; }
button, input, select, textarea { color: inherit; font: inherit; }
input[type="checkbox"], input[type="radio"] { line-height: normal; padding: 0px; }
*, ::after, ::before { box-sizing: border-box; }
#write h1, #write h2, #write h3, #write h4, #write h5, #write h6, #write p, #write pre { width: inherit; }
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p { line-height: inherit; }
h1, h2, h3, h4, h5, h6 { break-after: avoid-page; break-inside: avoid; orphans: 2; }
p { orphans: 4; }
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a { cursor: pointer; }
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#write input[type="checkbox"] { cursor: pointer; width: inherit; height: inherit; }
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tr { break-inside: avoid; break-after: auto; }
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.md-diagram-panel { width: 100%; margin-top: 10px; text-align: center; padding-top: 0px; padding-bottom: 8px; overflow-x: auto; }
#write .md-fences.mock-cm { white-space: pre-wrap; }
.md-fences.md-fences-with-lineno { padding-left: 0px; }
#write.fences-no-line-wrapping .md-fences.mock-cm { white-space: pre; overflow-x: auto; }
.md-fences.mock-cm.md-fences-with-lineno { padding-left: 8px; }
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.footnotes { opacity: 0.8; font-size: 0.9rem; margin-top: 1em; margin-bottom: 1em; }
.footnotes + .footnotes { margin-top: 0px; }
.md-reset { margin: 0px; padding: 0px; border: 0px; outline: 0px; vertical-align: top; background: 0px 0px; text-decoration: none; text-shadow: none; float: none; position: static; width: auto; height: auto; white-space: nowrap; cursor: inherit; -webkit-tap-highlight-color: transparent; line-height: normal; font-weight: 400; text-align: left; box-sizing: content-box; direction: ltr; }
li div { padding-top: 0px; }
blockquote { margin: 1rem 0px; }
li .mathjax-block, li p { margin: 0.5rem 0px; }
li { margin: 0px; position: relative; }
blockquote > :last-child { margin-bottom: 0px; }
blockquote > :first-child, li > :first-child { margin-top: 0px; }
.footnotes-area { color: rgb(136, 136, 136); margin-top: 0.714rem; padding-bottom: 0.143rem; white-space: normal; }
#write .footnote-line { white-space: pre-wrap; }
@media print {
body, html { border: 1px solid transparent; height: 99%; break-after: avoid; break-before: avoid; }
#write { margin-top: 0px; padding-top: 0px; border-color: transparent !important; }
.typora-export * { -webkit-print-color-adjust: exact; }
html.blink-to-pdf { font-size: 13px; }
.typora-export #write { padding-left: 32px; padding-right: 32px; padding-bottom: 0px; break-after: avoid; }
.typora-export #write::after { height: 0px; }
}
.footnote-line { margin-top: 0.714em; font-size: 0.7em; }
a img, img a { cursor: pointer; }
pre.md-meta-block { font-size: 0.8rem; min-height: 0.8rem; white-space: pre-wrap; background: rgb(204, 204, 204); display: block; overflow-x: hidden; }
p > .md-image:only-child:not(.md-img-error) img, p > img:only-child { display: block; margin: auto; }
p > .md-image:only-child { display: inline-block; width: 100%; }
#write .MathJax_Display { margin: 0.8em 0px 0px; }
.md-math-block { width: 100%; }
.md-math-block:not(:empty)::after { display: none; }
[contenteditable="true"]:active, [contenteditable="true"]:focus, [contenteditable="false"]:active, [contenteditable="false"]:focus { outline: 0px; box-shadow: none; }
.md-task-list-item { position: relative; list-style-type: none; }
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.md-task-list-item > input { position: absolute; top: 0px; left: 0px; margin-left: -1.2em; margin-top: calc(1em - 10px); border: none; }
.math { font-size: 1rem; }
.md-toc { min-height: 3.58rem; position: relative; font-size: 0.9rem; border-radius: 10px; }
.md-toc-content { position: relative; margin-left: 0px; }
.md-toc-content::after, .md-toc::after { display: none; }
.md-toc-item { display: block; color: rgb(65, 131, 196); }
.md-toc-item a { text-decoration: none; }
.md-toc-inner:hover { text-decoration: underline; }
.md-toc-inner { display: inline-block; cursor: pointer; }
.md-toc-h1 .md-toc-inner { margin-left: 0px; font-weight: 700; }
.md-toc-h2 .md-toc-inner { margin-left: 2em; }
.md-toc-h3 .md-toc-inner { margin-left: 4em; }
.md-toc-h4 .md-toc-inner { margin-left: 6em; }
.md-toc-h5 .md-toc-inner { margin-left: 8em; }
.md-toc-h6 .md-toc-inner { margin-left: 10em; }
@media screen and (max-width: 48em) {
.md-toc-h3 .md-toc-inner { margin-left: 3.5em; }
.md-toc-h4 .md-toc-inner { margin-left: 5em; }
.md-toc-h5 .md-toc-inner { margin-left: 6.5em; }
.md-toc-h6 .md-toc-inner { margin-left: 8em; }
}
a.md-toc-inner { font-size: inherit; font-style: inherit; font-weight: inherit; line-height: inherit; }
.footnote-line a:not(.reversefootnote) { color: inherit; }
.md-attr { display: none; }
.md-fn-count::after { content: "."; }
code, pre, samp, tt { font-family: var(--monospace); }
kbd { margin: 0px 0.1em; padding: 0.1em 0.6em; font-size: 0.8em; color: rgb(36, 39, 41); background: rgb(255, 255, 255); border: 1px solid rgb(173, 179, 185); border-radius: 3px; box-shadow: rgba(12, 13, 14, 0.2) 0px 1px 0px, rgb(255, 255, 255) 0px 0px 0px 2px inset; white-space: nowrap; vertical-align: middle; }
.md-comment { color: rgb(162, 127, 3); opacity: 0.8; font-family: var(--monospace); }
code { text-align: left; vertical-align: initial; }
a.md-print-anchor { white-space: pre !important; border-width: initial !important; border-style: none !important; border-color: initial !important; display: inline-block !important; position: absolute !important; width: 1px !important; right: 0px !important; outline: 0px !important; background: 0px 0px !important; text-decoration: initial !important; text-shadow: initial !important; }
.md-inline-math .MathJax_SVG .noError { display: none !important; }
.html-for-mac .inline-math-svg .MathJax_SVG { vertical-align: 0.2px; }
.md-math-block .MathJax_SVG_Display { text-align: center; margin: 0px; position: relative; text-indent: 0px; max-width: none; max-height: none; min-height: 0px; min-width: 100%; width: auto; overflow-y: hidden; display: block !important; }
.MathJax_SVG_Display, .md-inline-math .MathJax_SVG_Display { width: auto; margin: inherit; display: inline-block !important; }
.MathJax_SVG .MJX-monospace { font-family: var(--monospace); }
.MathJax_SVG .MJX-sans-serif { font-family: sans-serif; }
.MathJax_SVG { display: inline; font-style: normal; font-weight: 400; line-height: normal; zoom: 90%; text-indent: 0px; text-align: left; text-transform: none; letter-spacing: normal; word-spacing: normal; overflow-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; }
.MathJax_SVG * { transition: none 0s ease 0s; }
.MathJax_SVG_Display svg { vertical-align: middle !important; margin-bottom: 0px !important; margin-top: 0px !important; }
.os-windows.monocolor-emoji .md-emoji { font-family: "Segoe UI Symbol", sans-serif; }
.md-diagram-panel > svg { max-width: 100%; }
[lang="flow"] svg, [lang="mermaid"] svg { max-width: 100%; height: auto; }
[lang="mermaid"] .node text { font-size: 1rem; }
table tr th { border-bottom: 0px; }
video { max-width: 100%; display: block; margin: 0px auto; }
iframe { max-width: 100%; width: 100%; border: none; }
.highlight td, .highlight tr { border: 0px; }
svg[id^="mermaidChart"] { line-height: 1em; }
mark { background: rgb(255, 255, 0); color: rgb(0, 0, 0); }
.md-html-inline .md-plain, .md-html-inline strong, mark .md-inline-math, mark strong { color: inherit; }
mark .md-meta { color: rgb(0, 0, 0); opacity: 0.3 !important; }

.CodeMirror { height: auto; }
.CodeMirror.cm-s-inner { background: inherit; }
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.CodeMirror-gutters { border-right: 1px solid rgb(221, 221, 221); background: inherit; white-space: nowrap; }
.CodeMirror-linenumber { padding: 0px 3px 0px 5px; text-align: right; color: rgb(153, 153, 153); }
.cm-s-inner .cm-keyword { color: rgb(119, 0, 136); }
.cm-s-inner .cm-atom, .cm-s-inner.cm-atom { color: rgb(34, 17, 153); }
.cm-s-inner .cm-number { color: rgb(17, 102, 68); }
.cm-s-inner .cm-def { color: rgb(0, 0, 255); }
.cm-s-inner .cm-variable { color: rgb(0, 0, 0); }
.cm-s-inner .cm-variable-2 { color: rgb(0, 85, 170); }
.cm-s-inner .cm-variable-3 { color: rgb(0, 136, 85); }
.cm-s-inner .cm-string { color: rgb(170, 17, 17); }
.cm-s-inner .cm-property { color: rgb(0, 0, 0); }
.cm-s-inner .cm-operator { color: rgb(152, 26, 26); }
.cm-s-inner .cm-comment, .cm-s-inner.cm-comment { color: rgb(170, 85, 0); }
.cm-s-inner .cm-string-2 { color: rgb(255, 85, 0); }
.cm-s-inner .cm-meta { color: rgb(85, 85, 85); }
.cm-s-inner .cm-qualifier { color: rgb(85, 85, 85); }
.cm-s-inner .cm-builtin { color: rgb(51, 0, 170); }
.cm-s-inner .cm-bracket { color: rgb(153, 153, 119); }
.cm-s-inner .cm-tag { color: rgb(17, 119, 0); }
.cm-s-inner .cm-attribute { color: rgb(0, 0, 204); }
.cm-s-inner .cm-header, .cm-s-inner.cm-header { color: rgb(0, 0, 255); }
.cm-s-inner .cm-quote, .cm-s-inner.cm-quote { color: rgb(0, 153, 0); }
.cm-s-inner .cm-hr, .cm-s-inner.cm-hr { color: rgb(153, 153, 153); }
.cm-s-inner .cm-link, .cm-s-inner.cm-link { color: rgb(0, 0, 204); }
.cm-negative { color: rgb(221, 68, 68); }
.cm-positive { color: rgb(34, 153, 34); }
.cm-header, .cm-strong { font-weight: 700; }
.cm-del { text-decoration: line-through; }
.cm-em { font-style: italic; }
.cm-link { text-decoration: underline; }
.cm-error { color: red; }
.cm-invalidchar { color: red; }
.cm-constant { color: rgb(38, 139, 210); }
.cm-defined { color: rgb(181, 137, 0); }
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div.CodeMirror span.CodeMirror-nonmatchingbracket { color: rgb(255, 34, 34); }
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.CodeMirror { position: relative; overflow: hidden; }
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.CodeMirror-sizer { position: relative; }
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.CodeMirror-wrap pre { overflow-wrap: break-word; white-space: pre-wrap; word-break: normal; }
.CodeMirror-code pre { border-right: 30px solid transparent; width: fit-content; }
.CodeMirror-wrap .CodeMirror-code pre { border-right: none; width: auto; }
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.CodeMirror div.CodeMirror-cursor { visibility: hidden; }
.CodeMirror-focused div.CodeMirror-cursor { visibility: inherit; }
.cm-searching { background: rgba(255, 255, 0, 0.4); }
@media print {
.CodeMirror div.CodeMirror-cursor { visibility: hidden; }
}

:root {
--side-bar-bg-color: #fafafa;
--control-text-color: #777;
}

@include-when-export url(https://fonts.loli.net/css?family=Open+Sans:400italic,700italic,700,400&subset=latin,latin-ext);

html {
font-size: 16px;
}

body {
font-family: "Open Sans","Clear Sans","Helvetica Neue",Helvetica,Arial,sans-serif;
color: rgb(51, 51, 51);
line-height: 1.6;
}

#write {
max-width: 860px;
margin: 0 auto;
padding: 30px;
padding-bottom: 100px;
}
#write > ul:first-child,
#write > ol:first-child{
margin-top: 30px;
}

a {
color: #4183C4;
}
h1,
h2,
h3,
h4,
h5,
h6 {
position: relative;
margin-top: 1rem;
margin-bottom: 1rem;
font-weight: bold;
line-height: 1.4;
cursor: text;
}
h1:hover a.anchor,
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h4:hover a.anchor,
h5:hover a.anchor,
h6:hover a.anchor {
text-decoration: none;
}
h1 tt,
h1 code {
font-size: inherit;
}
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}
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}
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}
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font-size: inherit;
}
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font-size: inherit;
}
h1 {
padding-bottom: .3em;
font-size: 2.25em;
line-height: 1.2;
border-bottom: 1px solid #eee;
}
h2 {
padding-bottom: .3em;
font-size: 1.75em;
line-height: 1.225;
border-bottom: 1px solid #eee;
}
h3 {
font-size: 1.5em;
line-height: 1.43;
}
h4 {
font-size: 1.25em;
}
h5 {
font-size: 1em;
}
h6 {
font-size: 1em;
color: #777;
}
p,
blockquote,
ul,
ol,
dl,
table{
margin: 0.8em 0;
}
li>ol,
li>ul {
margin: 0 0;
}
hr {
height: 2px;
padding: 0;
margin: 16px 0;
background-color: #e7e7e7;
border: 0 none;
overflow: hidden;
box-sizing: content-box;
}

li p.first {
display: inline-block;
}
ul,
ol {
padding-left: 30px;
}
ul:first-child,
ol:first-child {
margin-top: 0;
}
ul:last-child,
ol:last-child {
margin-bottom: 0;
}
blockquote {
border-left: 4px solid #dfe2e5;
padding: 0 15px;
color: #777777;
}
blockquote blockquote {
padding-right: 0;
}
table {
padding: 0;
word-break: initial;
}
table tr {
border-top: 1px solid #dfe2e5;
margin: 0;
padding: 0;
}
table tr:nth-child(2n),
thead {
background-color: #f8f8f8;
}
table tr th {
font-weight: bold;
border: 1px solid #dfe2e5;
border-bottom: 0;
margin: 0;
padding: 6px 13px;
}
table tr td {
border: 1px solid #dfe2e5;
margin: 0;
padding: 6px 13px;
}
table tr th:first-child,
table tr td:first-child {
margin-top: 0;
}
table tr th:last-child,
table tr td:last-child {
margin-bottom: 0;
}

.CodeMirror-lines {
padding-left: 4px;
}

.code-tooltip {
box-shadow: 0 1px 1px 0 rgba(0,28,36,.3);
border-top: 1px solid #eef2f2;
}

.md-fences,
code,
tt {
border: 1px solid #e7eaed;
background-color: #f8f8f8;
border-radius: 3px;
padding: 0;
padding: 2px 4px 0px 4px;
font-size: 0.9em;
}

code {
background-color: #f3f4f4;
padding: 0 2px 0 2px;
}

.md-fences {
margin-bottom: 15px;
margin-top: 15px;
padding-top: 8px;
padding-bottom: 6px;
}

.md-task-list-item > input {
margin-left: -1.3em;
}

@media print {
html {
font-size: 13px;
}
table,
pre {
page-break-inside: avoid;
}
pre {
word-wrap: break-word;
}
}

.md-fences {
background-color: #f8f8f8;
}
#write pre.md-meta-block {
padding: 1rem;
font-size: 85%;
line-height: 1.45;
background-color: #f7f7f7;
border: 0;
border-radius: 3px;
color: #777777;
margin-top: 0 !important;
}

.mathjax-block>.code-tooltip {
bottom: .375rem;
}

.md-mathjax-midline {
background: #fafafa;
}

#write>h3.md-focus:before{
left: -1.5625rem;
top: .375rem;
}
#write>h4.md-focus:before{
left: -1.5625rem;
top: .285714286rem;
}
#write>h5.md-focus:before{
left: -1.5625rem;
top: .285714286rem;
}
#write>h6.md-focus:before{
left: -1.5625rem;
top: .285714286rem;
}
.md-image>.md-meta {
/*border: 1px solid #ddd;*/
border-radius: 3px;
padding: 2px 0px 0px 4px;
font-size: 0.9em;
color: inherit;
}

.md-tag {
color: #a7a7a7;
opacity: 1;
}

.md-toc {
margin-top:20px;
padding-bottom:20px;
}

.sidebar-tabs {
border-bottom: none;
}

#typora-quick-open {
border: 1px solid #ddd;
background-color: #f8f8f8;
}

#typora-quick-open-item {
background-color: #FAFAFA;
border-color: #FEFEFE #e5e5e5 #e5e5e5 #eee;
border-style: solid;
border-width: 1px;
}

/** focus mode */
.on-focus-mode blockquote {
border-left-color: rgba(85, 85, 85, 0.12);
}

header, .context-menu, .megamenu-content, footer{
font-family: "Segoe UI", "Arial", sans-serif;
}

.file-node-content:hover .file-node-icon,
.file-node-content:hover .file-node-open-state{
visibility: visible;
}

.mac-seamless-mode #typora-sidebar {
background-color: #fafafa;
background-color: var(--side-bar-bg-color);
}

.md-lang {
color: #b4654d;
}

.html-for-mac .context-menu {
--item-hover-bg-color: #E6F0FE;
}

#md-notification .btn {
border: 0;
}

.dropdown-menu .divider {
border-color: #e5e5e5;
}

.ty-preferences .window-content {
background-color: #fafafa;
}

.ty-preferences .nav-group-item.active {
color: white;
background: #999;
}
-->