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我在谷歌App Engine的dadastore以下类对象,我可以从“数据存储浏览器”看到他们:Google App Engine如何从servlet中获取对象?
import javax.jdo.annotations.IdGeneratorStrategy;
import javax.jdo.annotations.IdentityType;
import javax.jdo.annotations.PersistenceCapable;
import javax.jdo.annotations.Persistent;
import javax.jdo.annotations.PrimaryKey;
@PersistenceCapable(identityType=IdentityType.APPLICATION)
public class Contact_Info_Entry implements Serializable
{
@PrimaryKey
@Persistent(valueStrategy=IdGeneratorStrategy.IDENTITY)
Long Id;
public static final long serialVersionUID=26362862L;
String Contact_Id="",First_Name="",Last_Name="",Company_Name="",Branch_Name="",Address_1="",Address_2="",City="",State="",Zip="",Country="";
double D_1,D_2;
boolean B_1,B_2;
Vector<String> A_Vector=new Vector<String>();
public Contact_Info_Entry() { }
......
}
我的Java应用程序怎样才能从一个servlet URL的对象?举例来说,如果有谁是CONTACT_ID Contact_Info_Entry的一个实例是 “ABC-123”,和我的应用程序ID为:NM-java的
当我的Java程序访问的网址:
"http://nm-java.appspot.com/Check_Contact_Info?Contact_Id=ABC-123
如何将Check_Contact_Info的servlet从数据存储获取对象并将其返回给我的应用程序?
public class Check_Contact_Info_Servlet extends HttpServlet
{
static boolean Debug=true;
public void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException
{
}
...
protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException { doGet(request,response); }
}
对不起,我需要更加具体,如何发送对象出的反应如何?
public void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException
{
PrintWriter out=response.getWriter();
Contact_Info_Entry My_Contact_Entry;
... get My_Contact_Entry from datastore ...
??? How to send it out in the "response" ???
}
弗兰克
谢谢,我也需要这部分! – Frank 2010-04-27 14:23:19
@BalusC:是的,我在之前的其他程序中使用过OutputStream或Writer,但是我用它们发送了beck html字符串,而不是对象的实例,在这种情况下,“PrintWriter out = response.getWriter() ;”发回“Contact_Info_Entry My_Contact_Entry”?这是我卡住的地方。 – Frank 2010-04-27 14:44:22
@Frank:看看ObjectOutputStream – Thilo 2010-04-27 14:57:51