系统HIS开发ORACLE乱码解决方案（HIS库编码方式为US7ASCII）

package com.index.util;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Properties;
import java.util.Set;

import net.sf.json.JSONSerializer;
public class HisDbConnection {
	private Connection dbConnection = null;
	private Statement selectPro = null; // 用于 select 操作
	private Statement updatePro = null; // 用于 update 操作
	private ResultSet dbResultSet = null; // 操作 select 结果集

	private String driverName;// 声明oracle驱动类
	private String dbHost;
	private String dbPort;
	private String dbName;
	private String dbUserName;
	private String dbPassword;
	private String enCoding;

	private Integer count;

	/**
	 * 实例化DbConnection对象
	 * 
	 * @param host
	 *            数据库主机（IP）
	 * @param port
	 *            数据库端口
	 * @param dName
	 *            数据库名称
	 * @param uName
	 *            用户名
	 * @param password
	 *            用户密码
	 * @throws IOException
	 */
	public HisDbConnection() throws IOException {

		Properties p = new Properties();
		p.load(CreatTable.class
				.getResourceAsStream("/com/index/util/His.properties"));

		driverName = "oracle.jdbc.driver.OracleDriver";
		dbHost = p.getProperty("hisHost");
		dbPort = p.getProperty("hisPort");
		dbName = p.getProperty("hisName");
		dbUserName = p.getProperty("hisUserName");
		dbPassword = p.getProperty("hisPassword");
		//enCoding = "?useUnicode=true&characterEncoding=utf-8&autoReconnect=true";

	}// end DbConnection(...)

	public Connection getConnection() throws SQLException {

		StringBuilder urlTem = new StringBuilder();
		urlTem.append("jdbc:oracle:thin:@");
		urlTem.append(dbHost);
		urlTem.append(":");
		urlTem.append(dbPort);
		urlTem.append(":");
		urlTem.append(dbName);
		//urlTem.append(enCoding);
		String url = urlTem.toString();
		System.out.println("url========="+url);
		try {
			Class.forName(driverName).newInstance();
			dbConnection = DriverManager.getConnection(url, dbUserName,
					dbPassword);

		} catch (InstantiationException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		return dbConnection;

	}

	/**
	 * 执行专门的select操作，注意：在selectSql中的字段和fields中的个数、名称要保持一致
	 * 
	 * @param selectSql
	 *            用于执行的select语句
	 * @param fields
	 *            要选择的字段
	 * @return 含有Map的ArrayList，一条记录形成一个Map
	 */
	public ArrayList dbSelect(String selectSql, ArrayList fields) {
		ArrayList<Map> selectResult = new ArrayList<Map>();
		Map<String, String> recordInfo;
		try {
			selectPro = dbConnection.createStatement();// 定义Statement对象
			dbResultSet = selectPro.executeQuery(selectSql);
			while (dbResultSet.next()) {
				recordInfo = new HashMap<String, String>();
				for (int i = 0; i < fields.size(); i++)
					if(dbResultSet.getString((String) fields.get(i))==null){
						recordInfo.put((String) fields.get(i), "");
						}else{
						
						recordInfo.put((String) fields.get(i), new String(dbResultSet
								.getString((String) fields.get(i)).toString().getBytes("iso-8859-1"),"GBK" ));//这里的数据转码很重要！！！
						
						
					}
					
			
				selectResult.add(recordInfo);
				
			}
			
		  System.out.println(selectResult);
			dbResultSet.close(); // 断开结果集
			selectPro.close(); // 断开Statement对象
		}catch (Exception e) {
			System.out.println("选择操作失败");
			System.out.println("Sql = " + selectSql);
			e.printStackTrace();
		}
	
		return selectResult;
	}// end dbSelect(...)
 }

2、HKEY_LOCAL_MACHINE/SOFTWARE/ORACLE/HOME0/ORACLE/KEY_OraDb10g_home1下NLS_LANG改为：AMERICAN_AMERICA.US7ASCII