JBoss数据源的定义和使用

我使用Jboss作为5.1.x服务器。当我在java程序中使用带有jndi名称的数据源对象时，我在连接到服务器管理器连接池时出错。 请验证下面提到的细节，并给我一些建议，说明为什么会出现错误

为了将数据源放在Jndi中，我们必须将*-ds.xml文件放在default/deploy文件夹中，并使用以下标记

 <?xml version="1.0" encoding="UTF-8"?>
  <datasources>
  <local-tx-datasource>
 <jndi-name>MySqlDS</jndi-name>
 <connection-url>jdbc:mysql://localhost:3306/mysql</connection-url>
 <driver-class>org.gjt.mm.mysql.Driver</driver-class>
 <user-name>root</user-name>
 <password>root</password>
<exception-sorter-class-name>org.jboss.resource.adapter.
  jdbc.vendor.MySQLExceptionSorter
  </exception-sorter-class-  name>
    <new-connection-sql>SELECT 1</new-connection-sql>
    <check-valid-connection-sql>SELECT 1</check-valid-connection-sql>
 <metadata>
    <type-mapping>mySQL</type-mapping>
  </metadata>
  </local-tx-datasource>
 </datasources>

当我在类文件上面运行时，我得到了下面的错误堆栈跟踪

    D:\JAVA DRIVER\JAVA\JNDI>java JndiDsConTest
   Exception in thread "main" javax.naming.CommunicationException: Could not obtain
   connection to any of these urls: MySqlDS and discovery failed with error: javax
   .naming.CommunicationException: Receive timed out [Root exception is java.net.So
   cketTimeoutException: Receive timed out] [Root exception is javax.naming.Communi
  cationException: Failed to connect to server MySqlDS:1099 [Root exception is jav   
  ax.naming.ServiceUnavailableException: Failed to connect to server MySqlDS:1099
  [Root exception is java.net.UnknownHostException: MySqlDS]]]
    at org.jnp.interfaces.NamingContext.checkRef(NamingContext.java:1763)
    at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:693)
    at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:686)
    at javax.naming.InitialContext.lookup(Unknown Source)
    at JndiDsConTest.main(JndiDsConTest.java:25)
  Caused by: javax.naming.CommunicationException: Failed to connect to server MySq
  lDS:1099 [Root exception is javax.naming.ServiceUnavailableException: Failed to
   connect to server MySqlDS:1099 [Root exception is java.net.UnknownHostException:
  MySqlDS]]
    at org.jnp.interfaces.NamingContext.getServer(NamingContext.java:335)
    at org.jnp.interfaces.NamingContext.checkRef(NamingContext.java:1734)
    ... 4 more
   Caused by: javax.naming.ServiceUnavailableException: Failed to connect to server
   MySqlDS:1099 [Root exception is java.net.UnknownHostException: MySqlDS]
    at org.jnp.interfaces.NamingContext.getServer(NamingContext.java:305)
    ... 5 more  
   Caused by: java.net.UnknownHostException: MySqlDS
    at java.net.InetAddress.getAllByName0(Unknown Source)
    at java.net.InetAddress.getAllByName(Unknown Source)
    at java.net.InetAddress.getAllByName(Unknown Source)
    at java.net.InetAddress.getByName(Unknown Source)
    at org.jnp.interfaces.TimedSocketFactory.createSocket(TimedSocketFactory
    .java:81)
    at org.jnp.interfaces.NamingContext.getServer(NamingContext.java:301)
    ... 5 more

请给我找出错误的原因并解决

---

非常感谢。

查看stacktrace消息

java.net.UnknownHostException:MySqlDS

，我想JDBC驱动程序正在寻找一个名为“MySqlDS”的主机，所以我认为它不会从mysql-ds.xml文件中获取信息，至少不会像您在这里描述的那样

下面是我在JBoss5.1.0中使用的一些代码。（我显示的是您的数据源名称，而不是我的原始名称。）

我不知道JNDI查找是否区分大小写。我自己也一直用小写

我希望这有帮助

@覆盖 受保护的void doGet（HttpServletRequest-req，HttpServletResponse-resp）抛出ServletException，IOException{

    PrintWriter out = resp.getWriter();
    resp.setContentType("application/json");

    try {
        DataSourceFactory dataSourceFactory = new DataSourceFactory();
        IDAOFactory dAOFactory = new DAOFactoryImpl(dataSourceFactory);
        IServiceFactory serviceFactory = new ServiceFactoryImpl(dAOFactory);

        IItemService itemService = serviceFactory.getItemService();
        ArrayList<Item> allItems = itemService.getAll();
        Gson gson = new GsonBuilder().create();

        String list = gson.toJson(allItems);

        out.write(list);
    } catch (Throwable ex) {
        ServletException servletException = new ServletException(ex);
        throw servletException;
    } finally {
        if (out != null) {
            out.close();
        }
    }

}

PrintWriter out=resp.getWriter（）；
分别为setContentType（“应用程序/json”）；
试一试{
DataSourceFactory DataSourceFactory=新的DataSourceFactory（）；
IDAOFactory dAOFactory=新DAOFactoryImpl（数据源工厂）；
IServiceFactory=newServiceFactoryImpl（dAOFactory）；
IItemService itemService=serviceFactory.getItemService（）；
ArrayList allItems=itemService.getAll（）；
Gson Gson=new GsonBuilder（）.create（）；
String list=gson.toJson（allItems）；
写出（清单）；
}捕获（可丢弃的ex）{
ServletException ServletException=新ServletException（ex）；
抛出servletException；
}最后{
if（out！=null）{
out.close（）；
}
}
}

函数loadOrders（）{

var ajaxConfig={
键入：“获取”，
url:“getAllOrders”，
async:true，
contentType:“”，
数据：“，
数据类型：“json”
};
$.ajax（ajaxConfig）
.完成（功能（响应）{
对于（变量i=0；i

---

}

需要注意的几件事-1）确保连接字符串正确，2）确保数据库正常，3）确保使用正确的JDBC驱动程序。是的，所有这些设置都可以，但连接将被拒绝。。

javax.naming.Context ic = new javax.naming.InitialContext();
javax.naming.Context ctx = (javax.naming.Context) ic.lookup("java:");
javax.sql.DataSource ds = (javax.sql.DataSource) ctx.lookup("jdbc/mysqlds");
conn = ds.getConnection();

    PrintWriter out = resp.getWriter();
    resp.setContentType("application/json");

    try {
        DataSourceFactory dataSourceFactory = new DataSourceFactory();
        IDAOFactory dAOFactory = new DAOFactoryImpl(dataSourceFactory);
        IServiceFactory serviceFactory = new ServiceFactoryImpl(dAOFactory);

        IItemService itemService = serviceFactory.getItemService();
        ArrayList<Item> allItems = itemService.getAll();
        Gson gson = new GsonBuilder().create();

        String list = gson.toJson(allItems);

        out.write(list);
    } catch (Throwable ex) {
        ServletException servletException = new ServletException(ex);
        throw servletException;
    } finally {
        if (out != null) {
            out.close();
        }
    }

}

var ajaxConfig = {
    type: "GET",
    url: "getAllOrders",
    async: true,
    contentType: "",
    data: "",
    dataType: "json"
};

$.ajax(ajaxConfig)
        .done(function (response) {
            for (var i = 0; i < response.length; i++) {
                var html = "<tr> \
                            <td>" + response[i].orderId + "</td> \
                            <td>" + response[i].date + "</td>\
                            <td>" + response[i].customerId + "</td> \
                        </tr>";
                $("#tbleOrders tbody").append(html);
            }
        })
        .fail(function (xhr, status, errorMessage) {
            alert("Faild to load data !!");
        });