add readExcel for "NO fields"

test/com/lxyer/excel/ExcelKitTest.java

@@ -0,0 +1,47 @@
+package com.lxyer.excel;
+
+import com.lxyer.excel.poi.ExcelKit;
+import org.junit.Test;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * @author: liangxianyou at 2018/9/15 7:52.
+ */
+public class ExcelKitTest {
+
+    //read excel by fields
+    @Test
+    public void readTest() throws IOException {
+        /*String sql1 = "select a, b, c from Sheet1";
+        String sql2 = "select a, b, c from Sheet1 where a=1 order by b";
+        String sql3 = "select a, b, c from Sheet1 s1, Sheet2 s2 order by";
+        String sql4 = "select a, b, c from Sheet1 s1, Sheet2 s2 where order by";
+        String select = sql1.substring(0,sql1.indexOf("from")).replace("select", "").replace(" ", "");
+
+        System.out.println(sql1.substring(0,sql1.indexOf("from")).replace("select", "").replace(" ", ""));
+        */
+
+        String[] fields ={"a", "b", "c"};
+        File file = new File("res/test.xlsx");
+        List<Map> list = ExcelKit.readExcel(file, fields);
+        System.out.println(list.size());
+
+    }
+
+    //read excel no fields
+    @Test
+    public void readTest2() throws IOException {
+        List<Map> list = ExcelKit.readExcel(new File("res/test.xlsx"));
+
+        list.forEach(x->{
+            x.forEach((k,v)->{
+                System.out.println(String.format("%s:%s", k, v));
+            });
+        });
+    }
+
+}