当我在tomcat上测试我的web服务时，我收到一个“没有找到合适的驱动程序”错误。我在lib文件夹中有JDBC .jar，就像各种教程说的那样。下面是我的代码：

public class PostDBConnection {
 PreparedStatement st;
 ResultSet rs;
 Connection con;
 DataSource ds;
 InitialContext cxt;
 String url = "jdbc:postgresql://127.0.0.1:5432/UptonDB";
 String user = "*****";
 String password = "*******";
 String query = "";
 StringBuilder response = new StringBuilder();
@SuppressWarnings("unused")
public String getInfo(){
    int size = 0;  
    try {
        cxt = new InitialContext();     
        ds = (DataSource) cxt.lookup("java:comp/env/jdbc/UptonDB");
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    try{
        try {
            Class.forName("org.postgres.Driver");
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        con = DriverManager.getConnection(url, user, password);
        st =  con.prepareStatement("SELECT VERSION()");         
        rs = st.executeQuery();
        while(rs.next())
            {
                    response.append(rs.getString(1));
            }               
        }     
    catch(SQLException exc)
        {
            Logger lgr = Logger.getLogger(PostDBConnection.class.getName());
            lgr.log(Level.SEVERE, exc.getMessage(), exc);
        } 
    finally {
        try {
           if (rs != null) {
                rs.close();
            }
            if (st != null) {
                st.close();
            }
            if (con != null) {
                con.close();
            }
        } catch (SQLException ex) {
            Logger lgr = Logger.getLogger(PostDBConnection.class.getName());
            lgr.log(Level.WARNING, ex.getMessage(), ex);
        }
    }
    return response.toString();
}

字符串
这里还有我按照Tomcat网站上的说明创建的web.xml和context.xml文件：

<resource-ref>
<description>PostgreSQL Data Source </description>
<res-ref-name>jdbc/UptonDB</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>

型
web.xml:

<?xml version="1.0" encoding="UTF-8"?> 
   <Context>  
   <Resource name="jdbc/UptonDB" auth="Container" type="javax.sql.DataSource" 
    removeAbandoned="true" removeAbandonedTimeout="30" maxActive="80"   
    maxIdle="30" maxWait="10000" username="*****" password="*******"
    driverClassName="org.postgresql.Driver"
    url = "jdbc:postgresql://127.0.0.1:5432/UptonDB" useUnicode="true"
    characterEncoding="utf-8" characterSetResults="utf8"/>
   </Context>

型
任何帮助是赞赏感谢！