Question

我有一个表单来获取用户输入，使用JSP和servlet以及两个java类来获取数据并将它们插入到数据库中。我使用mysql开发了数据库，它在tomcat服务器上运行。

表单中的

数据通过post方法传递给servlet，并将它们存储在向量中。

这是servlet的代码：

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {

    response.setContentType("text/html;charset=UTF-8");
    PrintWriter out = response.getWriter();

    String profession = request.getParameter("name");
    String features = request.getParameter("address");


    Vector<String> v = new Vector<String>();

    v.addElement(name);
    v.addElement(address);


    Enumeration vEnum = v.elements();

    j=SqlInsert.insertValues(vEnum);

    if (j==0){
        out.println("<html>");
        out.println("<head>");
        out.println("<title>Servlet SubmitUser</title>");
        out.println("</head>");
        out.println("<body>");
        out.println("<h1>Error</h1>");
        out.println("</body>");
        out.println("</html>");
    }

    else{
        out.println("<html>");
        out.println("<head>");
        out.println("<title>Servlet SubmitUser</title>");
        out.println("</head>");
        out.println("<body>");
        out.println("<h1>Successfully Submmited</h1>");
        out.println("</body>");
        out.println("</html>");

    }

这是java类（SqlInsert），它从vector获取元素并设置为sql：

public class SqlInsert{

static int i=0;
Connection c=null;
static PreparedStatement statement = null;

public static int insertValues(Enumeration<String> params) {

      String sql = "INSERT INTO test (name, address
            + "values(?,?,?,?,?,?,?,?,?,?,?,?,?)";

    try {
        Connection c = DbConnection.connectDB();
        System.out.println("connected " + c);
        statement = c.prepareStatement(sql);
        System.out.println("connected ");

        c.setAutoCommit(false);
        int k = 1;
        while (params.hasMoreElements()) {
            String param = params.nextElement();
            statement.setString(k++, param);
        }  



        i = statement.executeUpdate();
        System.out.print(i);

        c.commit();


         } catch (SQLException ex) {
            Logger.getLogger(DbConnection.class.getName()).log(Level.SEVERE, null, ex);
            System.out.println("e " + ex.toString());
        }

     return i;
}



public static void main(String[] args) {
    Vector<String> v = new Vector<String>();
    Enumeration vEnum = v.elements();
    SqlInsert.insertValues(vEnum);       


}
    }

这是建立数据库连接的java类

public class DbConnection {

private static String driver = "com.mysql.jdbc.Driver";
private static String url = "jdbc:mysql://localhost:3306/online_feedback";
private static Connection con;



public static Connection connectDB(){    
    try {
        Class.forName(driver);
        con = DriverManager.getConnection(url, "root", "");
        System.out.println("Conn obj :::" + con);
    } catch (ClassNotFoundException ex) {
        Logger.getLogger(DbConnection.class.getName()).log(Level.SEVERE, null, ex);
    } catch (SQLException ex) {
        Logger.getLogger(DbConnection.class.getName()).log(Level.SEVERE, null, ex);
    }

    return con;  
}


public static void main (String []args){

    DbConnection db = new DbConnection();
    Connection s = db.connectDB();
}

我的问题是每当我提交表单时，似乎executeUpdate（）返回0.在服务器日志中，没有显示任何内容

请帮助我完成它。任何帮助都将受到高度赞赏。

提前致谢

无法将数据插入数据库

0 个答案: