还是数据库连接类 求完美

[lodachi]

import java.sql.Connection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.sql.DataSource;

public class DbConn {

	private static final String JNDI_NAME = "weblogic连接池的JNDI";
	
	private static Map dataSourceMap;
	
	static {
		dataSourceMap = Collections.synchronizedMap(new HashMap());
	}
	
	public static Connection getConnection() {
		try {
			DataSource dataSource = (DataSource) dataSourceMap.get(JNDI_NAME);
			if (null != dataSource) {
				return dataSource.getConnection();
			}
			Context context = new InitialContext();
			if (context == null) {
				System.out.println("Context is null");
			}
			dataSource = (DataSource) context.lookup(JNDI_NAME);
			dataSourceMap.put(JNDI_NAME, dataSource);
			return dataSource.getConnection();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}
	
}

[龙四]

import java.sql.Connection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.sql.DataSource;

public class DbConn {

    private static final String JNDI_NAME = "weblogic连接池的JNDI";
    
    private static Map dataSourceMap;
    
    static {
        dataSourceMap = new java.util.concurrent.ConcurrentHashMap();
    }
    
    public static Connection getConnection() {
        try {
            DataSource dataSource = (DataSource) dataSourceMap.get(JNDI_NAME);
            if(dataSource == null) {
				synchronized(dataSourceMap) {
					dataSource = (DataSource) dataSourceMap.get(JNDI_NAME);
					if(dataSource == null) {
						Context context = new InitialContext();
						if (context == null) {
							System.out.println("Context is null");
						}
						dataSource = (DataSource) context.lookup(JNDI_NAME);
						dataSourceMap.put(JNDI_NAME, dataSource);
					}
				}
			}
			return dataSource.getConnection();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
    
}

[lodachi]

[Quote=引用 1 楼 ticmy 的回复:]

Java code
import java.sql.Connection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.sql……
[/Quote]这样做有什么好处 能说说吗？

[lodachi]

没人呢？

[rorom]

一直用自带连接池的路过,帮你顶起来.

[Jeelon]

个人觉得DAO JDBC模版就比较好 写的 ...

[lodachi]

加分了

[suntingtingonly]

连接池 我用的是别人写好的。 自己用的。 顶你一个。