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深夜,在東莞,7天酒店,打開電腦,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,尤其是對于后臺管理更是一個串列一個匯出,如果從匯出的業務中抽離出復用代碼,專注于邏輯開發,對于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,
準備作業
準備作業是看檔案了解EasyExcel嗎?不,我們直接上手吧!我發現最近的業務里面,最簡單的例子已經應付下來了!所以準備作業自然只需匯入EasyExcel的jar包,這里我們由于是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
準備作業已經完成,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,不能重復,
?x@Data
public class ExportVo {
@ExcelProperty(value = "名稱", index = 0)
private String name;
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@ExcelProperty(value = "時間", index = 1)
private Date time;
@NumberFormat("#.##%")
@ExcelProperty(value = "完成率", index = 2)
private Float rate;
}
接下來是邏輯實作:
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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());
}
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private List getExportVoList() {
// 這里主要是獲取List<ExportVo>內容,不提供實作了,需要說下注意點,
1、匯出串列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一般采用分sheet匯出(尤其xls檔案,有65535條數限制)、分檔案打包匯出,上傳檔案服務器異步匯出,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,二來分頁插件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 {
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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());
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LongestMatchColumnWidthStyleStrategy longestMatchColumnWidthStyleStrategy =
new LongestMatchColumnWidthStyleStrategy();
EasyExcel.write(response.getOutputStream(), cls)
.sheet("sheet1")
.registerWriteHandler(longestMatchColumnWidthStyleStrategy)
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.doWrite(dataList);
response.flushBuffer();
}
啟動程式,使用postman試下,直接點Send的話會回傳一堆亂碼,選擇Send and Download則可匯出Excel,不過檔案名是URL編碼過的,這個檔案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;
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@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();
}
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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;
// 存放匯入串列
List<ImportDto> list = new ArrayList<>();
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private ImportService importService;
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public UploadDataListener(ImportService importService) {
this.importService = importService;
}
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@Override
public void invoke(ImportDto importDto, AnalysisContext analysisContext) {
list.add(importDto);
if (list.size() >= BATCH_COUNT) {
saveData();
list.clear();
}
}
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@Override
public void doAfterAllAnalysed(AnalysisContext analysisContext) {
saveData();
}
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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);
}
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}
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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,然后怎么友好提示錯誤的內容,通過回傳一個包含錯誤資訊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,
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padding-right: 8px } body.typora-export { padding-left: 30px; padding-right: 30px } .typora-export .footnote-line, .typora-export li, .typora-export p { white-space: pre-wrap } @media screen and (max-width: 500px) { body.typora-export { padding-left: 0; padding-right: 0 } #write { padding-left: 20px; padding-right: 20px } .CodeMirror-sizer { margin-left: 0 !important } .CodeMirror-gutters { display: none !important } } #write li>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 } input[type="checkbox"], input[type="radio"] { line-height: normal; padding: 0 } *, ::after, ::before { box-sizing: border-box } #write h1, #write h2, #write h3, #write h4, #write h5, #write h6, #write p, #write pre { width: inherit } #write h1, #write h2, #write h3, #write h4, #write h5, #write h6, #write p { position: relative } p { line-height: inherit } h1, h2, h3, h4, h5, h6 { break-after: avoid-page; 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width: 100%; overflow: auto; break-inside: auto; text-align: left } table.md-table td { min-width: 32px } .CodeMirror-gutters { border-right: 0; background-color: inherit } .CodeMirror-linenumber { user-select: none } .CodeMirror { text-align: left } .CodeMirror-placeholder { opacity: 0.3 } .CodeMirror pre { padding: 0 4px } .CodeMirror-lines { padding: 0 } div.hr:focus { cursor: none } #write pre { white-space: pre-wrap } #write.fences-no-line-wrapping pre { white-space: pre } #write pre.ty-contain-cm { white-space: normal } .CodeMirror-gutters { margin-right: 4px } .md-fences { font-size: 0.9rem; display: block; break-inside: avoid; text-align: left; overflow: visible; white-space: pre; position: relative !important } .md-diagram-panel { width: 100%; margin-top: 10px; text-align: center; padding-top: 0; padding-bottom: 8px; overflow-x: auto } #write .md-fences.mock-cm { white-space: pre-wrap } .md-fences.md-fences-with-lineno { padding-left: 0 } #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 } .CodeMirror-line, twitterwidget { break-inside: avoid } .footnotes { opacity: 0.8; font-size: 0.9rem; margin-top: 1em; margin-bottom: 1em } .footnotes+.footnotes { margin-top: 0 } .md-reset { margin: 0; padding: 0; border: 0; outline: 0; vertical-align: top; background: left top; 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: 0 } blockquote { margin: 1rem 0 } li .mathjax-block, li p { margin: 0.5rem 0 } li { margin: 0; position: relative } blockquote>:last-child { margin-bottom: 0 } blockquote>:first-child, li>:first-child { margin-top: 0 } .footnotes-area { color: rgba(136, 136, 136, 1); 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 rgba(0, 0, 0, 0); height: 99%; break-after: avoid; break-before: avoid } #write { margin-top: 0; padding-top: 0; border-color: rgba(0, 0, 0, 0) !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: 0; break-after: avoid } .typora-export #write::after { height: 0 } } .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: rgba(204, 204, 204, 1); 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 0 0 } .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: 0; box-shadow: none } .md-task-list-item { position: relative; list-style-type: none } .task-list-item.md-task-list-item { padding-left: 0 } .md-task-list-item>input { position: absolute; top: 0; left: 0; 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: 0 } .md-toc-content::after, .md-toc::after { display: none } .md-toc-item { display: block; color: rgba(65, 131, 196, 1) } .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: 0; 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; 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height: auto } [lang="mermaid"] .node text { font-size: 1rem } table tr th { border-bottom: 0 } video { max-width: 100%; display: block; margin: 0 auto } iframe { max-width: 100%; width: 100%; border: none } .highlight td, .highlight tr { border: 0 } svg[id^="mermaidChart"] { line-height: 1em } mark { background: rgba(255, 255, 0, 1); color: rgba(0, 0, 0, 1) } .md-html-inline .md-plain, .md-html-inline strong, mark .md-inline-math, mark strong { color: inherit } mark .md-meta { color: rgba(0, 0, 0, 1); opacity: 0.3 !important } .CodeMirror { height: auto } .CodeMirror.cm-s-inner { } .CodeMirror-scroll { z-index: 3 } .CodeMirror-gutter-filler, .CodeMirror-scrollbar-filler { background-color: rgba(255, 255, 255, 1) } .CodeMirror-gutters { border-right: 1px solid rgba(221, 221, 221, 1); white-space: nowrap } .CodeMirror-linenumber { padding: 0 3px 0 5px; text-align: right; color: rgba(153, 153, 153, 1) } .cm-s-inner .cm-keyword { color: rgba(119, 0, 136, 1) } .cm-s-inner .cm-atom, .cm-s-inner.cm-atom { color: rgba(34, 17, 153, 1) } .cm-s-inner .cm-number { color: rgba(17, 102, 68, 1) } .cm-s-inner .cm-def { color: rgba(0, 0, 255, 1) } .cm-s-inner .cm-variable { color: rgba(0, 0, 0, 1) } .cm-s-inner .cm-variable-2 { color: rgba(0, 85, 170, 1) } .cm-s-inner .cm-variable-3 { color: rgba(0, 136, 85, 1) } .cm-s-inner .cm-string { color: rgba(170, 17, 17, 1) } .cm-s-inner .cm-property { color: rgba(0, 0, 0, 1) } .cm-s-inner .cm-operator { color: rgba(152, 26, 26, 1) } .cm-s-inner .cm-comment, .cm-s-inner.cm-comment { color: rgba(170, 85, 0, 1) } .cm-s-inner .cm-string-2 { color: rgba(255, 85, 0, 1) } .cm-s-inner .cm-meta { color: rgba(85, 85, 85, 1) } .cm-s-inner .cm-qualifier { color: rgba(85, 85, 85, 1) } .cm-s-inner .cm-builtin { color: rgba(51, 0, 170, 1) } .cm-s-inner .cm-bracket { color: rgba(153, 153, 119, 1) } .cm-s-inner .cm-tag { color: rgba(17, 119, 0, 1) } .cm-s-inner .cm-attribute { color: rgba(0, 0, 204, 1) } .cm-s-inner .cm-header, .cm-s-inner.cm-header { color: rgba(0, 0, 255, 1) } .cm-s-inner .cm-quote, .cm-s-inner.cm-quote { color: rgba(0, 153, 0, 1) } .cm-s-inner .cm-hr, .cm-s-inner.cm-hr { color: rgba(153, 153, 153, 1) } .cm-s-inner .cm-link, .cm-s-inner.cm-link { color: rgba(0, 0, 204, 1) } .cm-negative { color: rgba(221, 68, 68, 1) } .cm-positive { color: rgba(34, 153, 34, 1) } .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: rgba(255, 0, 0, 1) } .cm-invalidchar { color: rgba(255, 0, 0, 1) } .cm-constant { color: rgba(38, 139, 210, 1) } .cm-defined { color: rgba(181, 137, 0, 1) } div.CodeMirror span.CodeMirror-matchingbracket { color: rgba(0, 255, 0, 1) } div.CodeMirror span.CodeMirror-nonmatchingbracket { color: rgba(255, 34, 34, 1) } .cm-s-inner .CodeMirror-activeline-background { } .CodeMirror { position: relative; overflow: hidden } .CodeMirror-scroll { height: 100%; outline: 0; position: relative; box-sizing: content-box } .CodeMirror-sizer { position: relative } .CodeMirror-gutter-filler, .CodeMirror-hscrollbar, .CodeMirror-scrollbar-filler, .CodeMirror-vscrollbar { position: absolute; z-index: 6; display: none } .CodeMirror-vscrollbar { right: 0; top: 0; overflow: hidden } .CodeMirror-hscrollbar { bottom: 0; left: 0; overflow: hidden } .CodeMirror-scrollbar-filler { right: 0; bottom: 0 } .CodeMirror-gutter-filler { left: 0; bottom: 0 } .CodeMirror-gutters { position: absolute; left: 0; top: 0; padding-bottom: 30px; z-index: 3 } .CodeMirror-gutter { white-space: normal; height: 100%; box-sizing: content-box; padding-bottom: 30px; margin-bottom: -32px; display: inline-block } .CodeMirror-gutter-wrapper { position: absolute; z-index: 4; background: left top !important; border: none !important } .CodeMirror-gutter-background { position: absolute; top: 0; bottom: 0; z-index: 4 } .CodeMirror-gutter-elt { position: absolute; cursor: default; z-index: 4 } .CodeMirror-lines { cursor: text } .CodeMirror pre { border-radius: 0; border-width: 0; background: left top; font-family: inherit; font-size: inherit; margin: 0; white-space: pre; overflow-wrap: normal; color: inherit; z-index: 2; position: relative; overflow: visible } .CodeMirror-wrap pre { overflow-wrap: break-word; white-space: pre-wrap; word-break: normal } .CodeMirror-code pre { border-right: 30px solid rgba(0, 0, 0, 0) } .CodeMirror-wrap .CodeMirror-code pre { border-right: none; width: auto } .CodeMirror-linebackground { position: absolute; left: 0; right: 0; top: 0; bottom: 0; z-index: 0 } .CodeMirror-linewidget { position: relative; z-index: 2; overflow: auto } .CodeMirror-wrap .CodeMirror-scroll { overflow-x: hidden } .CodeMirror-measure { position: absolute; width: 100%; height: 0; overflow: hidden; visibility: hidden } .CodeMirror-measure pre { position: static } .CodeMirror div.CodeMirror-cursor { position: absolute; visibility: hidden; border-right: none; width: 0 } .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: rgba(51, 51, 51, 1); line-height: 1.6 } #write { max-width: 860px; margin: 0 auto; padding: 30px 30px 100px } #write>ul:first-child, #write>ol:first-child { margin-top: 30px } a { color: rgba(65, 131, 196, 1) } 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, h2:hover a.anchor, h3:hover a.anchor, h4:hover a.anchor, h5:hover a.anchor, h6:hover a.anchor { text-decoration: none } h1 tt, h1 code { font-size: inherit } h2 tt, h2 code { font-size: inherit } h3 tt, h3 code { font-size: inherit } h4 tt, h4 code { font-size: inherit } h5 tt, h5 code { font-size: inherit } h6 tt, h6 code { font-size: inherit } h1 { padding-bottom: 0.3em; font-size: 2.25em; line-height: 1.2; border-bottom: 1px solid rgba(238, 238, 238, 1) } h2 { padding-bottom: 0.3em; font-size: 1.75em; line-height: 1.225; border-bottom: 1px solid rgba(238, 238, 238, 1) } h3 { font-size: 1.5em; line-height: 1.43 } h4 { font-size: 1.25em } h5 { font-size: 1em } h6 { font-size: 1em; color: rgba(119, 119, 119, 1) } p, blockquote, ul, ol, dl, table { margin: 0.8em 0 } li>ol, li>ul { margin: 0 } hr { height: 2px; padding: 0; margin: 16px 0; background-color: rgba(231, 231, 231, 1); 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 rgba(223, 226, 229, 1); padding: 0 15px; color: rgba(119, 119, 119, 1) } blockquote blockquote { padding-right: 0 } table { padding: 0; word-break: initial } table tr { border-top: 1px solid rgba(223, 226, 229, 1); margin: 0; padding: 0 } table tr:nth-child(2n), thead { background-color: rgba(248, 248, 248, 1) } table tr th { font-weight: bold; border-top: 1px solid rgba(223, 226, 229, 1); border-right: 1px solid rgba(223, 226, 229, 1); border-bottom: 0; border-left: 1px solid rgba(223, 226, 229, 1); margin: 0; padding: 6px 13px } table tr td { border: 1px solid rgba(223, 226, 229, 1); 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 rgba(0, 28, 36, 0.3); border-top: 1px solid rgba(238, 242, 242, 1) } .md-fences, code, tt { border: 1px solid rgba(231, 234, 237, 1); background-color: rgba(248, 248, 248, 1); border-radius: 3px; padding: 2px 4px 0; font-size: 0.9em } code { background-color: rgba(243, 244, 244, 1); padding: 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: rgba(248, 248, 248, 1) } #write pre.md-meta-block { padding: 1rem; font-size: 85%; line-height: 1.45; background-color: rgba(247, 247, 247, 1); border: 0; border-radius: 3px; color: rgba(119, 119, 119, 1); margin-top: 0 !important } .mathjax-block>.code-tooltip { bottom: 0.375rem } .md-mathjax-midline { background: rgba(250, 250, 250, 1) } #write>h3.md-focus:before { left: -1.5625rem; top: 0.375rem } #write>h4.md-focus:before { left: -1.5625rem; top: 0.285714286rem } #write>h5.md-focus:before { left: -1.5625rem; top: 0.285714286rem } #write>h6.md-focus:before { left: -1.5625rem; top: 0.285714286rem } .md-image>.md-meta { border-radius: 3px; padding: 2px 0 0 4px; font-size: 0.9em; color: inherit } .md-tag { color: rgba(167, 167, 167, 1); opacity: 1 } .md-toc { margin-top: 20px; padding-bottom: 20px } .sidebar-tabs { border-bottom: none } #typora-quick-open { border: 1px solid rgba(221, 221, 221, 1); background-color: rgba(248, 248, 248, 1) } #typora-quick-open-item { background-color: rgba(250, 250, 250, 1); border-top: 1px solid rgba(254, 254, 254, 1); border-right: 1px solid rgba(229, 229, 229, 1); border-bottom: 1px solid rgba(229, 229, 229, 1); border-left: 1px solid rgba(238, 238, 238, 1) } .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: var(--side-bar-bg-color) } .md-lang { color: rgba(180, 101, 77, 1) } .html-for-mac .context-menu { --item-hover-bg-color: #E6F0FE } #md-notification .btn { border: 0 } .dropdown-menu .divider { border-color: rgba(229, 229, 229, 1) } .ty-preferences .window-content { background-color: rgba(250, 250, 250, 1) } .ty-preferences .nav-group-item.active { color: rgba(255, 255, 255, 1); background: rgba(153, 153, 153, 1) }</style>轉載請註明出處,本文鏈接:https://www.uj5u.com/houduan/152924.html
標籤:Java
