写文件改为 try with resource 形式

src/main/java/com/jfinal/plugin/activerecord/generator/ModelGenerator.java

@@ -125,16 +125,9 @@ public class ModelGenerator {
 			return ;	// 若 Model 存在，不覆盖
 		}
 		
-		OutputStreamWriter osw = null;
-		try {
-			osw = new OutputStreamWriter(new FileOutputStream(file), "UTF-8");
+		try (OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream(file), "UTF-8")) {
 			osw.write(tableMeta.modelContent);
 		}
-		finally {
-			if (osw != null) {
-				osw.close();
-			}
-		}
 	}
 	
 	public String getModelPackageName() {