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!198 ListUtil.page方法

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Merge pull request !198 from lucky44/v5-dev
This commit is contained in:
Looly 2020-10-22 10:39:45 +08:00 committed by Gitee
commit 5db99b05cb
2 changed files with 52 additions and 2 deletions
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4
hutool-core/src/main/java/cn/hutool/core/collection/ListUtil.java
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@ -245,7 +245,7 @@ public class ListUtil {
int resultSize = list.size();
// 每页条目数大于总数直接返回所有
if (resultSize <= pageSize) {
if (pageNo < 1) {
if (pageNo < (PageUtil.getFirstPageNo()+1)) {
return Collections.unmodifiableList(list);
} else {
// 越界直接返回空
@ -253,7 +253,7 @@ public class ListUtil {
}
}
// 相乘可能会导致越界 临时用long
if (((long) pageNo * pageSize) > resultSize) {
if (((long) (pageNo-PageUtil.getFirstPageNo()) * pageSize) > resultSize) {
// 越界直接返回空
return new ArrayList<>(0);
}

50
hutool-core/src/test/java/cn/hutool/core/collection/ListUtilTest.java
View File

@ -2,6 +2,7 @@ package cn.hutool.core.collection;
import cn.hutool.core.date.StopWatch;
import cn.hutool.core.lang.Console;
import cn.hutool.core.util.PageUtil;
import cn.hutool.core.util.RandomUtil;
import org.junit.Assert;
import org.junit.Ignore;
@ -53,4 +54,53 @@ public class ListUtilTest {
final int[] indexArray2 = ListUtil.indexOfAll(a, "1"::equals);
Assert.assertArrayEquals(new int[]{0,6}, indexArray2);
}
@Test
public void pageTest(){
List<Integer> a = ListUtil.toLinkedList(1, 2, 3,4,5);
PageUtil.setFirstPageNo(1);
int[] a_1 = ListUtil.page(1,2,a).stream().mapToInt(Integer::valueOf).toArray();
int[] a1 = ListUtil.page(1,2,a).stream().mapToInt(Integer::valueOf).toArray();
int[] a2 = ListUtil.page(2,2,a).stream().mapToInt(Integer::valueOf).toArray();
int[] a3 = ListUtil.page(3,2,a).stream().mapToInt(Integer::valueOf).toArray();
int[] a4 = ListUtil.page(4,2,a).stream().mapToInt(Integer::valueOf).toArray();
Assert.assertArrayEquals(new int[]{1,2},a_1);
Assert.assertArrayEquals(new int[]{1,2},a1);
Assert.assertArrayEquals(new int[]{3,4},a2);
Assert.assertArrayEquals(new int[]{5},a3);
Assert.assertArrayEquals(new int[]{},a4);
PageUtil.setFirstPageNo(2);
int[] b_1 = ListUtil.page(1,2,a).stream().mapToInt(Integer::valueOf).toArray();
int[] b1 = ListUtil.page(2,2,a).stream().mapToInt(Integer::valueOf).toArray();
int[] b2 = ListUtil.page(3,2,a).stream().mapToInt(Integer::valueOf).toArray();
int[] b3 = ListUtil.page(4,2,a).stream().mapToInt(Integer::valueOf).toArray();
int[] b4 = ListUtil.page(5,2,a).stream().mapToInt(Integer::valueOf).toArray();
Assert.assertArrayEquals(new int[]{1,2},b_1);
Assert.assertArrayEquals(new int[]{1,2},b1);
Assert.assertArrayEquals(new int[]{3,4},b2);
Assert.assertArrayEquals(new int[]{5},b3);
Assert.assertArrayEquals(new int[]{},b4);
PageUtil.setFirstPageNo(0);
int[] c_1 = ListUtil.page(-1,2,a).stream().mapToInt(Integer::valueOf).toArray();
int[] c1 = ListUtil.page(0,2,a).stream().mapToInt(Integer::valueOf).toArray();
int[] c2 = ListUtil.page(1,2,a).stream().mapToInt(Integer::valueOf).toArray();
int[] c3 = ListUtil.page(2,2,a).stream().mapToInt(Integer::valueOf).toArray();
int[] c4 = ListUtil.page(3,2,a).stream().mapToInt(Integer::valueOf).toArray();
Assert.assertArrayEquals(new int[]{1,2},c_1);
Assert.assertArrayEquals(new int[]{1,2},c1);
Assert.assertArrayEquals(new int[]{3,4},c2);
Assert.assertArrayEquals(new int[]{5},c3);
Assert.assertArrayEquals(new int[]{},c4);
PageUtil.setFirstPageNo(1);
int[] d1 = ListUtil.page(0,8,a).stream().mapToInt(Integer::valueOf).toArray();
Assert.assertArrayEquals(new int[]{1,2,3,4,5},d1);
}
}