refactor(EmpHBaseClient): 重构 HBase 客户端代码

- 将配置和连接相关代码提取到静态初始化方法中
- 添加静态 Admin 对象以提高性能
- 优化异常处理，使用 RuntimeException 抛出运行时异常
- 调整 HBase 客户端配置参数，提高连接可靠性
- 重构 close 方法，确保资源正确释放
- 新增 main 方法作为程序入口，演示功能使用

src/main/java/EmpHBaseClient.java

@@ -32,42 +32,59 @@ import org.apache.hadoop.hbase.util.Bytes;
 import org.apache.commons.codec.digest.DigestUtils;
 
 public class EmpHBaseClient {
-    private Configuration conf;
-    private Connection connection;
+    private static Configuration conf;
+    private static Connection connection;
+    private static Admin admin;
     private Table table; // 添加表对象成员变量
 
-    public EmpHBaseClient() {
+    // 新增静态初始化方法
+    public static void init() {
         conf = HBaseConfiguration.create();
         conf.set("hbase.zookeeper.quorum", "localhost");
-        // 新增ZooKeeper端口配置（默认2181但显式声明更可靠）
         conf.set("hbase.zookeeper.property.clientPort", "2181");
-        // 新增重试策略配置（解决临时连接问题）
-        conf.set("hbase.client.retries.number", "3");
-        conf.set("hbase.rpc.timeout", "60000");
+        conf.set("hbase.client.retries.number", "5");
+        conf.set("hbase.client.pause", "1000");
+        conf.set("hbase.rpc.timeout", "120000");
+        conf.set("hbase.zookeeper.connection.timeout", "30000");
         
         try {
             connection = ConnectionFactory.createConnection(conf);
+            admin = connection.getAdmin();
+        } catch (IOException e) {
+            e.printStackTrace();
+            throw new RuntimeException("HBase连接初始化失败", e);
+        }
+    }
+
+    // 修改构造函数依赖静态连接
+    public EmpHBaseClient() {
+        if (connection == null) {
+            init();
+        }
+        try {
             table = connection.getTable(TableName.valueOf("emp1520"));
         } catch (IOException e) {
             e.printStackTrace();
+            throw new RuntimeException("获取表失败", e);
         }
     }
 
     // 创建职工表结构
     public void createEmpTable() throws IOException {
-        try (Admin admin = connection.getAdmin()) {
-            if (admin.tableExists(TableName.valueOf("emp1520"))) {
-                System.out.println("Table already exists");
-                return;
-            }
-            HTableDescriptor tableDesc = new HTableDescriptor(TableName.valueOf("emp1520"));
-            tableDesc.addFamily(new HColumnDescriptor("empnum")); // 存储员工ID
-            tableDesc.addFamily(new HColumnDescriptor("info")); // 存储基本信息
-            tableDesc.addFamily(new HColumnDescriptor("salary")); // 存储薪资
-            tableDesc.addFamily(new HColumnDescriptor("performance")); // 存储绩效信息
-            tableDesc.addFamily(new HColumnDescriptor("training")); // 存储培训课程
-            admin.createTable(tableDesc);
+        if (admin == null) {
+            throw new IOException("Admin未初始化");
         }
+        if (admin.tableExists(TableName.valueOf("emp1520"))) {
+            System.out.println("Table already exists");
+            return;
+        }
+        HTableDescriptor tableDesc = new HTableDescriptor(TableName.valueOf("emp1520"));
+        tableDesc.addFamily(new HColumnDescriptor("empnum")); // 存储员工ID
+        tableDesc.addFamily(new HColumnDescriptor("info")); // 存储基本信息
+        tableDesc.addFamily(new HColumnDescriptor("salary")); // 存储薪资
+        tableDesc.addFamily(new HColumnDescriptor("performance")); // 存储绩效信息
+        tableDesc.addFamily(new HColumnDescriptor("training")); // 存储培训课程
+        admin.createTable(tableDesc);
     }
 
     // 新增方法：生成RowKey前缀（MD5处理）
@@ -126,9 +143,13 @@ public class EmpHBaseClient {
     }
 
     // 修改构造函数：关闭资源时确保连接释放（新增close方法）
-    public void close() throws IOException {
-        if (table != null) table.close();
-        if (connection != null) connection.close();
+    public static void close() {
+        try {
+            if (admin != null) admin.close();
+            if (connection != null) connection.close();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
     }
 
     // 新增查询ID 7500以上员工方法
@@ -247,9 +268,9 @@ public class EmpHBaseClient {
 
     // 新增main方法作为入口
     public static void main(String[] args) {
-        EmpHBaseClient client = null;
         try {
-            client = new EmpHBaseClient();
+            EmpHBaseClient.init(); // 新增静态初始化调用
+            EmpHBaseClient client = new EmpHBaseClient();
             System.out.println("1. 创建表结构...");
             client.createEmpTable();
 
@@ -271,13 +292,7 @@ public class EmpHBaseClient {
         } catch (IOException e) {
             e.printStackTrace();
         } finally {
-            if (client != null) {
-                try {
-                    client.close();
-                } catch (IOException e) {
-                    e.printStackTrace();
-                }
-            }
+            EmpHBaseClient.close(); // 新增静态关闭调用
         }
     }
 }