打开生成的PDF文件时出错。使用JSF

Question

通过使用以下代码，PDF文件正在下载，但是当我尝试打开该PDF文件时，它显示错误：不是pdf或已损坏  这是我的xhtmlcode： RichEditor.xhtml ：

<ui:composition template="/WEB-INF/templates/main-template.xhtml"
                xmlns="http://www.w3.org/1999/xhtml"
                xmlns:ui="http://java.sun.com/jsf/facelets"
                xmlns:h="http://java.sun.com/jsf/html"
                xmlns:f="http://java.sun.com/jsf/core"
                xmlns:p="http://primefaces.org/ui">

    <ui:define name="header">
        Add your header here or delete to use the default
    </ui:define>
    <ui:define name="content">
        <h:form id="form">  

        <p:editor id="editor" value="#{editorData.data}" width="600"/>  

        <h:commandButton value="submit"  action="#{editorData.save}"></h:commandButton>

        </h:form>

         <a href="../Editordatapdf" ><img src="D://excel.png" alt="Download" /></a> 

    </ui:define>
    <ui:define name="footer">
        Add your footer here or delete to use the default
    </ui:define>
</ui:composition>

这是我的以下Managed bean： 的 EditorData.java：

import javax.faces.context.FacesContext;
import javax.servlet.http.HttpSession;

public class EditorData {

    private String data;


    public String getData() {
        return data;
    }

    public void setData(String data) {
        this.data = data;


    }

    public EditorData()
    {


    }


    public String save()
    {

        HttpSession session = (HttpSession)FacesContext.getCurrentInstance().getExternalContext().getSession(true);
        session.setAttribute("userdata", data);




        return"Success";

    }


}

这是我的Servlet页面： 在这里，我将保存用户在我的数据库中提供的数据。而且我想用用户给定的样式（如：字体，颜色等）将数据存储到pdf中。

Editordatapdf.java

import java.io.IOException;

import javax.faces.context.FacesContext;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;


import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Date;


import com.primeki.development.utils.DBConnection;


public class Editordatapdf extends HttpServlet {
    private static final long serialVersionUID = 1L;


    DBConnection dbconnection;
    Connection connection;
    PreparedStatement ps;
    Statement state;
    ResultSet rs;




    public Editordatapdf() {
        super();
        // TODO Auto-generated constructor stub
    }

    public void init(ServletConfig config) throws ServletException {
        // TODO Auto-generated method stub
    }


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

        System.out.println("This is the Servlet Page");



        doPost(request, response);


    }

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


        try {


        javax.servlet.http.HttpSession session=request.getSession();
        System.out.println("This is the servlet page data"+ session.getAttribute("userdata"));
        dbconnection = new DBConnection();  
        System.out.println("This is the Servlet Page");
        connection = dbconnection.getConnection();
        System.out.println("Connection Successfully");
        String SqlQuery = " INSERT into richtext (data) VALUES" + "(?)";
        System.out.println(SqlQuery);
        ps=connection.prepareStatement(SqlQuery);
        String data = (String) session.getAttribute("userdata");

        ps.setString(1,data);

        ps.executeUpdate();
        System.out.println("customerstatement is executed Completed..!!!");



        response.setContentType("application/pdf");
        response.setHeader("Content-Disposition", "attachment; filename=Data.pdf");
        PrintWriter out = response.getWriter();

        out.println(session.getAttribute("userdata"));





        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }





    }

}

我在尝试打开pdf文件时收到错误消息。请帮我解决这个问题

谢谢....