阿里JAVA解析Excel工具easyexcel（exceljava工具包）

java解析、生成Excel比较有名的框架有Apache poi、jxl。但他们都存在一个严重的问题就是非常的耗内存，poi有一套SAX模式的API可以一定程度的解决一些内存溢出的问题，但POI还是有一些缺陷，比如07版Excel解压缩以及解压后存储都是在内存中完成的，内存消耗依然很大。easyexcel重写了poi对07版Excel的解析，能够原本一个3M的excel用POI sax依然需要100M左右内存降低到KB级别，并且再大的excel不会出现内存溢出，03版依赖POI的sax模式。在上层做了模型转换的封装，让使用者更加简单方便

二方包

<dependency> <groupId>com.alibaba</groupId> <artifactId>easyexcel</artifactId> <version>{latestVersion}</version> </dependency>

读Excel

测试代码地址：https://github.com/alibaba/easyexcel/blob/master/src/test/java/com/alibaba/easyexcel/test/ReadTest.java

读07版小于1000行数据返回List<List>

List<Object> data = EasyExcelFactory.read(inputStream, new Sheet(1, 0));

读07版小于1000行数据返回List<? extend BaseRowModel>

List<Object> data = EasyExcelFactory.read(inputStream, new Sheet(2, 1,JavaModel.class));

读07版大于1000行数据返回List<List>

ExcelListener excelListener = new ExcelListener(); EasyExcelFactory.readBySax(inputStream, new Sheet(1, 1), excelListener);

读07版大于1000行数据返回List<? extend BaseRowModel>

ExcelListener excelListener = new ExcelListener(); EasyExcelFactory.readBySax(inputStream, new Sheet(2, 1,JavaModel.class), excelListener);

读03版方法同上

写Excel

测试代码地址：https://github.com/alibaba/easyexcel/blob/master/src/test/java/com/alibaba/easyexcel/test/WriteTest.java 没有模板

ExcelWriter writer = EasyExcelFactory.getWriter(out); //写第一个sheet, sheet1 数据全是List<String> 无模型映射关系 Sheet sheet1 = new Sheet(1, 3); sheet1.setSheetName("第一个sheet"); //设置列宽 设置每列的宽度 Map columnWidth = new HashMap(); columnWidth.put(0,10000);columnWidth.put(1,40000);columnWidth.put(2,10000);columnWidth.put(3,10000); sheet1.setColumnWidthMap(columnWidth); sheet1.setHead(createTestListStringHead()); //or 设置自适应宽度 //sheet1.setAutoWidth(Boolean.TRUE); writer.write1(createTestListObject(), sheet1); //写第二个sheet sheet2 模型上打有表头的注解，合并单元格 Sheet sheet2 = new Sheet(2, 3, JavaModel1.class, "第二个sheet", null); sheet2.setTableStyle(createTableStyle()); writer.write(createTestListJavaMode(), sheet2); //写第三个sheet包含多个table情况 Sheet sheet3 = new Sheet(3, 0); sheet3.setSheetName("第三个sheet"); Table table1 = new Table(1); table1.setHead(createTestListStringHead()); writer.write1(createTestListObject(), sheet3, table1); //写sheet2 模型上打有表头的注解 Table table2 = new Table(2); table2.setTableStyle(createTableStyle()); table2.setClazz(JavaModel1.class); writer.write(createTestListJavaMode(), sheet3, table2); //关闭资源 writer.finish(); out.close();

有模板

OutputStream out = new FileOutputStream("/Users/jipengfei/2007.xlsx"); ExcelWriter writer = EasyExcelFactory.getWriterWithTemp(inputStream,out,ExcelTypeEnum.XLSX,true); //写第一个sheet, sheet1 数据全是List<String> 无模型映射关系 Sheet sheet1 = new Sheet(1, 3); sheet1.setSheetName("第一个sheet"); //设置列宽 设置每列的宽度 Map columnWidth = new HashMap(); columnWidth.put(0,10000);columnWidth.put(1,40000);columnWidth.put(2,10000);columnWidth.put(3,10000); sheet1.setColumnWidthMap(columnWidth); sheet1.setHead(createTestListStringHead()); //or 设置自适应宽度 //sheet1.setAutoWidth(Boolean.TRUE); writer.write1(createTestListObject(), sheet1); //写第二个sheet sheet2 模型上打有表头的注解，合并单元格 Sheet sheet2 = new Sheet(2, 3, JavaModel1.class, "第二个sheet", null); sheet2.setTableStyle(createTableStyle()); writer.write(createTestListJavaMode(), sheet2); //写第三个sheet包含多个table情况 Sheet sheet3 = new Sheet(3, 0); sheet3.setSheetName("第三个sheet"); Table table1 = new Table(1); table1.setHead(createTestListStringHead()); writer.write1(createTestListObject(), sheet3, table1); //写sheet2 模型上打有表头的注解 Table table2 = new Table(2); table2.setTableStyle(createTableStyle()); table2.setClazz(JavaModel1.class); writer.write(createTestListJavaMode(), sheet3, table2); //关闭资源 writer.finish(); out.close();

web下载实例写法

public class Down { @GetMapping("/a.htm") public void cooperation(HttpServletRequest request, HttpServletResponse response) { ServletOutputStream out = response.getOutputStream(); ExcelWriter writer = new ExcelWriter(out, ExcelTypeEnum.XLSX, true); String fileName = new String(("UserInfo " new SimpleDateFormat("yyyy-MM-dd").format(new Date())) .getBytes(), "UTF-8"); Sheet sheet1 = new Sheet(1, 0); sheet1.setSheetName("第一个sheet"); writer.write0(getListString(), sheet1); writer.finish(); response.setContentType("multipart/form-data"); response.setCharacterEncoding("utf-8"); response.setHeader("Content-disposition", "attachment;filename=" fileName ".xlsx"); out.flush(); } } }