Question

我有一个带有setter和getter方法的pojo类和一个servlet类，我在其中从jsp页面获取值，然后调用dataaccess类的函数，即EmployeeBean和传递参数，所以问题是它没有被插入数据库因为blob和datatype probelm请有人在这帮助我...

public class Employee 
{

private int empId;
private String iname;
private String photo;
private String contentType;
private int contentLength;
private InputStream inputstream;

public InputStream getInputstream() {
    return inputstream;
}
public void setInputstream(InputStream inputstream) {
    this.inputstream = inputstream;
}
 public String getContentType() {
    return contentType;
}
public void setContentType(String contentType) {
    this.contentType = contentType;
}


public int getContentLength() {
    return contentLength;
}
public void setContentLength(int contentLength) {
    this.contentLength = contentLength;
}
public String getIname() {
    return iname;
}
public void setIname(String iname) {
    this.iname = iname;
}
 }


 @MultipartConfig(maxFileSize = 18177215)   
 @WebServlet(name = "FileUploadServlet", urlPatterns = {"/FileUploadServlet"})
public class FileUploadServlet extends HttpServlet
  {

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

HttpSession session = request.getSession(true); 
InputStream inputStream = null;

Employee emp1 = (Employee)session.getAttribute("emp1");
int n = emp1.getEmpId();



emp1.setEmpId(emp1.getEmpId());
emp1.setIname(request.getParameter("iname"));
 Part filePart = request.getPart("photo");
if (filePart != null) {
    emp1.setContentType(filePart.getContentType());
    emp1.setContentLength((int) filePart.getSize());
    inputStream = filePart.getInputStream();
    emp1.setInputstream(inputStream);
    EmployeeBean eb = new EmployeeBean();
        emp1 = eb.addImage(emp1);
       session.setAttribute("emp1",emp1);
        response.sendRedirect("EmployeeDetail.jsp");
   }
 }

}

  @Override
  protected void doGet(HttpServletRequest request, HttpServletResponse response)
          throws ServletException, IOException {
      processRequest(request, response);
  }

     @Override
  protected void doPost(HttpServletRequest request, HttpServletResponse response)
          throws ServletException, IOException {
      processRequest(request, response);
  }

   @Override
  public String getServletInfo() {
      return "Short description";
  }
}



  public Employee addImage(Employee emp1) {
  Connection con = null;
  Statement stmt = null;
  PreparedStatement pstmt = null;
  ResultSet rs = null;
 try {
      con = ConnectionManager.getConnection();
      stmt = con.createStatement();
      pstmt = con.prepareStatement("INSERT INTO upload_documents(Name, contentType,     contentLength, empId, photo) values(?,?,?,?,?)");

      pstmt.setString(1, emp1.getIname());
      pstmt.setString(2, emp1.getContentType());
      pstmt.setInt(3, emp1.getContentLength());
      pstmt.setInt(4, emp1.getEmpId());
    pstmt.setBlob(5,emp1.getInputstream());
      pstmt.execute();
        } catch (SQLException  ex) {

  } finally {
      try {
          if (stmt != null) {
              stmt.close();
          }
          if (con != null) {
              con.close();
          }
      } catch (SQLException ex) {
          Logger.getLogger(EmployeeBean.class.getName()).log(Level.SEVERE, null, ex);
      }
  }
  return emp1;
 }

Answer 1

public class Employee 
{
....
private byte[] fileBytes;
.....
}

@MultipartConfig(maxFileSize = 18177215)   
 @WebServlet(name = "FileUploadServlet", urlPatterns = {"/FileUploadServlet"})
public class FileUploadServlet extends HttpServlet
  {

 protected void processRequest(HttpServletRequest request, 
    HttpServletResponse response)
        throws ServletException, IOException {
    ....
    InputStream is = filePart.getInputStream()
    emp1.setFileBytes(IOUtils.toByteArray(is))
    }
......
}

public Employee addImage(Employee emp1) {
  Connection con = null;
  Statement stmt = null;
  ....
   pstmt.setBytes(5,emp1.getFileBytes());
  ....
}

如何使用mvc在数据库中存储图像或任何类型的文档

1 个答案: