jsp读取大对象CLOB并生成xml文件示例

http://www.pcdog.com 2004-7-6 互联网

这个程序是我在一个用XML做外部数据交换平台的项目中最初用到的，虽然后来用到其它方式解决，但其思路还是有一定参考价值，程序很简单，不难看懂，还请专家们不吝指教……

<%@ page contentType="text/html; charset=gb2312" %>
<%@ page info="database handler"%>
<%@ page import="java.io.*"%>
<%@ page import="java.net.*"%>
<%@ page import="java.lang.*"%>
<%@ page import="java.util.*"%>
<%@ page import="java.sql.*"%>
<%@ page import="javax.servlet.*"%>
<%@ page import="javax.servlet.http.*"%>
<%@ page import="oracle.sql.CLOB"%>
<%@ page import="oracle.jdbc.driver.OracleResultSet"%>

<html>
<head>
    <meta content="text/html; charset=gb2312" http-equiv="content-type">
</head>
<body>
<%
    int i=0;
    String parID = request.getParameter("id_no");
    String strSql;
    String content="";

    try{
            String xmlFile = "/usr/local/tomcat/webapps/vehicles/test.xml";

        Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
        String dburl="jdbc:oracle:thin:@192.168.15.250:1521:ycdb";
        Connection con=DriverManager.getConnection(dburl,"training","deep1704sea");
        Statement stmt=con.createStatement();

        //使用流读取CLOB或BLOB列
        strSql = "select xmlgen.getxml('select * from account_holder where id_no=''0001''') from dual ";
        ResultSet rs=stmt.executeQuery(strSql);
        if(rs.next()){
            CLOB clob = ((OracleResultSet)rs).getCLOB(1);
            if(clob!=null){
                Reader is = clob.getCharacterStream();
                BufferedReader br = new BufferedReader(is);
                String s = br.readLine();
                while(s!=null){
                        content += s;
                        s=br.readLine();
                }
            }
        }


        //将从数据库中读出的内容写到文件中
        FileOutputStream fo = new FileOutputStream(xmlFile);
        PrintStream so = new PrintStream(fo);
        so.println(content);
        so.close();

        rs.close();
        stmt.close();
        con.close();

      }catch(Exception e){
        out.println(e);
         }
%>
</body>
</html>