Question

我正在尝试在netbeans 8.2（server-tomcat 8.0.27.0）上的Web应用程序中创建Web服务，该服务可以连接到postgres上的数据库并读取名为“ test”的表。我在download.java中有此代码（Web服务在一个名为serve的软件包中）

Download.java

undefined

这是我的context.xml文件（在META-INF中）

context.xml

@WebService(serviceName = "download")
public class Download {

    Connection con=null;    

    private DataSource getJdbcPostgres() throws NamingException, SQLException {
        Context c = new InitialContext();
        DataSource ds=(DataSource) c.lookup("java:comp/env/jdbc/postgres");
        con=ds.getConnection();
        return ds;
   }

   @WebMethod(operationName = "download")
   public String download(@WebParam(name = "username")String username, @WebParam(name = "id")String id) throws ClassNotFoundException, SQLException {

       String sql = "select * from test where id="+id;
       Class.forName("org.postgresql.Driver");
       PreparedStatement pst=con.prepareStatement(sql);
       ResultSet rs=pst.executeQuery();
       ResultSetMetaData rsmd=rs.getMetaData();
       rs.next();
       return "";
   } 

}

这是web.xml（在WEB-INF中）：

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<Context path="/service2">
 <Resource name="jdbc/postgres" auth="Container"
      type="javax.sql.DataSource" driverClassName="org.postgresql.Driver"
      url="jdbc:postgresql://localhost:5432/postgres"
      username="someusername" password="somepassword" maxTotal="20" maxIdle="10"
      maxWaitMillis="-1"/>
 </Context>

clean and build命令成功，但未部署在Tomcat的Apache服务器上错误消息（当我尝试部署它时输出）：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee 
http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">
   <listener>
       <listener-class>com.sun.xml.ws.transport.http.servlet.WSServletContextListener</listener-class>
   </listener>
   <servlet>
       <servlet-name>download</servlet-name>
       <servlet-class>com.sun.xml.ws.transport.http.servlet.WSServlet</servlet-class>
       <load-on-startup>1</load-on-startup>
   </servlet>
   <servlet-mapping>
       <servlet-name>download</servlet-name>
       <url-pattern>/download</url-pattern>
   </servlet-mapping>
   <session-config>
       <session-timeout>
           30
       </session-timeout>
   </session-config>
   <resource-ref>
       <description>postgreSQL Datasource example</description>
       <res-ref-name>jdbc/postgres</res-ref-name>
       <res-type>javax.sql.DataSource</res-type>
       <res-auth>Container</res-auth>
   </resource-ref>
</web-app>

当我尝试将服务器更改为GlassFish 4.1.1时，它说：

Checking data source definitions for missing JDBC drivers...
Undeploying ...
undeploy?path=/service2
OK - Undeployed application at context path /service2
In-place deployment at D:\NetBeansProjects\service2\build\web
Deployment is in progress...
deploy?config=file%3A%2FC%3A%2FUsers%2FTRAINE%7E3%2FAppData%2FLocal%2FTemp%2Fcontext1366288511044657094.xml&path=/service2
FAIL - Deployed application at context path /service2 but context failed to start
D:\NetBeansProjects\service2\nbproject\build-impl.xml:1094: The module has not been deployed.
See the server log for details.
BUILD FAILED (total time: 2 seconds)

我是该领域的新手，所以如果我在某个地方出错或缺少某些东西，请帮助我！

Answer 1

我不知道为什么会发生，但是我只是尝试捕获而不是抛出，并且它正在部署！

@WebMethod(operationName = "download")
public String download(@WebParam(name = "username")String username, @WebParam(name = "id")String id) {
try {
        String sql="select * from test";
        Connection conn=myDatasource.getConnection();
        PreparedStatement pst=conn.prepareStatement(sql);
        rs=pst.executeQuery();
        }
    catch (SQLException ex) {
        Logger.getLogger(connect.class.getName()).log(Level.SEVERE, null, ex);
    }
return "someString";
}

任何人都可以提出建议，为什么它不能更早起作用？尽管我的问题已解决，但我很好奇知道“ throws Exception”出了什么问题！附言这次我在GlassFish 4.1.1上运行它

模块尚未部署

1 个答案: