* 分页读取监听器支持自定义分页条数 [Issue #2383](https://github.com/alibaba/easyexcel/issues/2383)

easyexcel-core/src/main/java/com/alibaba/excel/read/listener/PageReadListener.java

@@ -15,7 +15,7 @@ import org.apache.commons.collections4.CollectionUtils;
  */
 public class PageReadListener<T> implements ReadListener<T> {
     /**
-     * Single handle the amount of data
+     * Defuault single handle the amount of data
      */
     public static int BATCH_COUNT = 100;
     /**
@@ -27,23 +27,26 @@ public class PageReadListener<T> implements ReadListener<T> {
      */
     private final Consumer<List<T>> consumer;
 
-    private final int pageSize;
+    /**
+     * Single handle the amount of data
+     */
+    private final int batchCount;
 
     public PageReadListener(Consumer<List<T>> consumer) {
         this(consumer, BATCH_COUNT);
     }
 
-    public PageReadListener(Consumer<List<T>> consumer,int pageSize) {
+    public PageReadListener(Consumer<List<T>> consumer, int batchCount) {
         this.consumer = consumer;
-        this.pageSize = pageSize;
+        this.batchCount = batchCount;
     }
 
     @Override
     public void invoke(T data, AnalysisContext context) {
         cachedDataList.add(data);
-        if (cachedDataList.size() >= pageSize) {
+        if (cachedDataList.size() >= batchCount) {
             consumer.accept(cachedDataList);
-            cachedDataList = ListUtils.newArrayListWithExpectedSize(BATCH_COUNT);
+            cachedDataList = ListUtils.newArrayListWithExpectedSize(batchCount);
         }
     }
 

easyexcel-core/src/main/java/com/alibaba/excel/util/SheetUtils.java

@@ -20,8 +20,7 @@ public class SheetUtils {
     /**
      * Match the parameters to the actual sheet
      *
-     * @param readSheet
+     * @param readSheet       actual sheet
-     *            actual sheet
      * @param analysisContext
      * @return
      */
@@ -48,10 +47,12 @@ public class SheetUtils {
                     boolean autoTrim = (parameterReadSheet.getAutoTrim() != null && parameterReadSheet.getAutoTrim())
                         || (parameterReadSheet.getAutoTrim() == null
                         && analysisContext.readWorkbookHolder().getGlobalConfiguration().getAutoTrim());
+                    String sheetName = readSheet.getSheetName();
                     if (autoTrim) {
                         parameterSheetName = parameterSheetName.trim();
+                        sheetName = sheetName.trim();
                     }
-                    match = parameterSheetName.equals(readSheet.getSheetName());
+                    match = parameterSheetName.equals(sheetName);
                 }
             }
             if (match) {

easyexcel-test/src/test/java/com/alibaba/easyexcel/test/core/simple/SimpleDataTest.java

@@ -5,11 +5,16 @@ import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Map;
 
+import com.alibaba.easyexcel.test.demo.read.DemoData;
 import com.alibaba.easyexcel.test.util.TestFileUtil;
 import com.alibaba.excel.EasyExcel;
+import com.alibaba.excel.read.listener.PageReadListener;
 import com.alibaba.excel.support.ExcelTypeEnum;
+import com.alibaba.fastjson.JSON;
 
+import lombok.extern.slf4j.Slf4j;
 import org.junit.Assert;
 import org.junit.BeforeClass;
 import org.junit.FixMethodOrder;
@@ -20,6 +25,7 @@ import org.junit.runners.MethodSorters;
  * @author Jiaju Zhuang
  */
 @FixMethodOrder(MethodSorters.NAME_ASCENDING)
+@Slf4j
 public class SimpleDataTest {
 
     private static File file07;
@@ -90,8 +96,20 @@ public class SimpleDataTest {
 
     @Test
     public void t21SheetNameRead07() {
-        EasyExcel.read(TestFileUtil.readFile("simple" + File.separator + "simple07.xlsx"), SimpleData.class,
+        List<Map<Integer, Object>> list = EasyExcel.read(
-            new SimpleDataSheetNameListener()).sheet("simple").doRead();
+                TestFileUtil.readFile("simple" + File.separator + "simple07.xlsx"))
+            .sheet("simple")
+            .doReadSync();
+        Assert.assertEquals(1, list.size());
+    }
+
+    @Test
+    public void t22PageReadListener07() {
+        EasyExcel.read(file07, SimpleData.class,
+                new PageReadListener<SimpleData>(dataList -> {
+                    Assert.assertEquals(5, dataList.size());
+                }, 5))
+            .sheet().doRead();
     }
 
     private void synchronousRead(File file) {

easyexcel-test/src/test/java/com/alibaba/easyexcel/test/demo/read/ReadTest.java

@@ -47,12 +47,13 @@ public class ReadTest {
         // since: 3.0.0-beta1
         String fileName = TestFileUtil.getPath() + "demo" + File.separator + "demo.xlsx";
         // 这里 需要指定读用哪个class去读，然后读取第一个sheet 文件流会自动关闭
-        // 这里每次会读取100条数据 然后返回过来 直接调用使用数据就行
+        // 这里默认每次会读取100条数据 然后返回过来 直接调用使用数据就行
+        // 具体需要返回多少行可以在`PageReadListener`的构造函数设置
         EasyExcel.read(fileName, DemoData.class, new PageReadListener<DemoData>(dataList -> {
             for (DemoData demoData : dataList) {
                 log.info("读取到一条数据{}", JSON.toJSONString(demoData));
             }
-        },3)).sheet().doRead();
+        })).sheet().doRead();
 
         // 写法2：
         // 匿名内部类 不用额外写一个DemoDataListener

update.md

@@ -3,6 +3,7 @@
 * 兼容`LocalDate` [Issue #2908](https://github.com/alibaba/easyexcel/issues/2908)
 * 优化大文件内存存储，减少内存占用 [Issue #2657](https://github.com/alibaba/easyexcel/issues/2657)
 * 在临时文件被删除的情况下能正常的读取 [Issue #2693](https://github.com/alibaba/easyexcel/issues/2693)
+* 分页读取监听器支持自定义分页条数 [Issue #2383](https://github.com/alibaba/easyexcel/issues/2383)
 
 # 3.2.0