新增[通用数据导入案例]

src/net/tccn/kit/poi/ExcelKit.java

@@ -294,6 +294,9 @@ public class ExcelKit {
 
             Map map = new HashMap();
             for (int j = 0; j < cellNum && j < fields.length; j++) {
+                if (fields[j] == null || "".equals(fields[j])) {
+                    continue;
+                }
                 Cell cell = row.getCell(j);
                 if (cell == null) {
                     map.put(fields[j], "");
@@ -385,23 +388,6 @@ public class ExcelKit {
             e.printStackTrace();
         }
         return null;
-        /*Workbook wk;
-        FileInputStream fis = new FileInputStream(file);
-        try {
-            wk = new HSSFWorkbook(fis);//if excel version 2007+ will throws OfficeXmlFileException
-        } catch (OfficeXmlFileException e) {
-            wk = new SXSSFWorkbook(new XSSFWorkbook(fis));
-        } finally {
-            if (fis != null) {
-                try {
-                    fis.close();
-                } catch (Exception e) {
-                    //e.printStackTrace();
-                }
-            }
-        }
-
-        return wk;*/
     }
 
     //dev

test/com/lxyer/excel/ExcelKitTest.java

@@ -17,11 +17,15 @@ public class ExcelKitTest {
     @Test
     public void mapExport(){
         // 数据List<T>  T可以是map，也可以是某个Javabean
-        List list = asList(
-                Map.of("name", "张三", "age", 12), //jdk9+语法，创建Map并初始化数据
-                Map.of("name", "李四", "age", 11)
-        );
+        Map m1 = new HashMap();
+        m1.put("name", "张三");
+        m1.put("age", 12);
 
+        Map m2 = new HashMap();
+        m2.put("name", "李四");
+        m2.put("age", 11);
+
+        List list = asList(m1, m2);
         // 表头数据 k-v，k：map的数据key，v：表头展示的名称
         LinkedHashMap heads = new LinkedHashMap();
         heads.put("name", "姓名");
@@ -81,4 +85,74 @@ public class ExcelKitTest {
         });
     }
 
+    //---------------------------  通用导入案例  --------------------------------
+
+    static Properties properties = new Properties();
+    static {
+        try {
+            // 读取导入配置文件
+            properties.load(new FileReader(new File("test/resource/import.txt")));
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    /**
+     * 构建入库语句
+     * @param list  数据list<Map>
+     * @param heads 数据库需要入库的字段
+     * @param table 实体表
+     * @return
+     */
+    private String buildSql(List<Map> list, String[] heads, String table) {
+        StringBuilder bufKs = new StringBuilder();
+        StringBuilder bufVs = new StringBuilder();
+
+        for (String k : heads) {
+            if (!k.isEmpty()) {
+                bufKs.append("`" + k + "`,");
+            }
+        }
+        bufKs.deleteCharAt(bufKs.length() - 1);
+
+        list.forEach(m -> {
+            bufVs.append("(");
+            for (String k : heads) {
+                if (!k.isEmpty()) {
+                    bufVs.append("'" + m.get(k) + "',");
+                }
+            }
+            bufVs.deleteCharAt(bufVs.length() - 1); //去除最后多余的 逗号
+            bufVs.append("),");
+        });
+        bufVs.deleteCharAt(bufVs.length() - 1); //去除最后多余的 逗号
+        return String.format("INSERT INTO %s (%s) VALUES %s;", table, bufKs, bufVs);    // table, ks, vs
+    }
+
+    /**
+     * 通用数据导入
+     */
+    @Test
+    public void importTest() {
+        String key = "user";    // 假定使用业务实体表名作为key
+
+        // 获取需要导入的列
+        String cfg = properties.getProperty(key);
+        String[] heads = cfg.split(",");
+        for (int i = 0; i < heads.length; i++) {
+            heads[i] = heads[i].trim();
+        }
+
+        // 通过配置读取数据,userData.xlsx为待导入数据
+        List<Map> list = ExcelKit.readExcel(new File("test/resource/userData.xlsx"), heads);
+        list.remove(0); // 去除多余的行首两行
+        list.remove(0);
+
+        System.out.println(list);   // 打印出数据看看是否ok
+
+        // 创建入库语句
+        String sql = buildSql(list, heads, key);
+        System.out.println(sql);
+    }
+
 }

test/resource/import.txt

@@ -0,0 +1,2 @@
+# 假定我们就使用数据库对应的 “列名”作为导入配置，如果excel中间有需要跳过的列 配置中用空号占位
+user= ,username, ,     sex,phone,email