我创建了这个 servlet 方法：
/**
* Create the entity and persist it.
*/
protected void doPut(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
logger.log(Level.INFO, "Creating User!!!");
PrintWriter out = resp.getWriter();
String email = req.getParameter("email");
String password = req.getParameter("password");
try {
user.insert(email, password);
Log.info("Inserted: " + email + " " + password);
} catch (Exception e) {
String msg = DAOUser.getErrorMessage(e);
out.print(msg);
}
}
并希望通过以下值插入 GAE DB：
<form class="form-horizontal" action="/user" method="put">
<fieldset>
<div class="control-group">
<!-- Text input-->
<label class="control-label" for="input01">Email:</label>
<div class="controls">
<input name="email" placeholder="email" class="input-xlarge" type="text">
<%=request.getParameter("email") %>
</div>
</div>
<div class="control-group">
<!-- Text input-->
<label class="control-label" for="input01">Password:</label>
<div class="controls">
<input name="password" placeholder="password" class="input-xlarge"
type="text">
<%=request.getParameter("email") %>
</div>
</div>
</fieldset>
</form>
<div class="modal-footer">
<a href="#" class="btn" data-dismiss="modal">Close</a> <a
href="#" class="btn btn-primary" type="submit" value="Submit">Save
Changes</a>
</div>
但是，它不起作用，如果 servlet 映射正确：
<servlet-mapping>
<servlet-name>DAOServletUser</servlet-name>
<url-pattern>/user</url-pattern>
</servlet-mapping>
我的错误是什么？
更新 当我重新启动服务器时，我得到了这个：
Mär 22, 2013 6:46:07 AM com.google.appengine.tools.development.ApiProxyLocalImpl log
SEVERE: javax.servlet.ServletContext log: unavailable
javax.servlet.UnavailableException: Servlet class gaeTrader2.server.dao.DAOServletUser is not a javax.servlet.Servlet
at org.mortbay.jetty.servlet.ServletHolder.checkServletType(ServletHolder.java:362)
at org.mortbay.jetty.servlet.ServletHolder.doStart(ServletHolder.java:243)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:685)
at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)
at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1250)
at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:517)
at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:467)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
at org.mortbay.jetty.Server.doStart(Server.java:224)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at com.google.appengine.tools.development.JettyContainerService.startContainer(JettyContainerService.java:228)
at com.google.appengine.tools.development.AbstractContainerService.startup(AbstractContainerService.java:255)
at com.google.appengine.tools.development.AbstractServer.startup(AbstractServer.java:79)
at com.google.appengine.tools.development.DevAppServerImpl$Servers.startup(DevAppServerImpl.java:451)
at com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java:198)
at com.google.appengine.tools.development.gwt.AppEngineLauncher.start(AppEngineLauncher.java:97)
at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:509)
at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1093)
at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:836)
at com.google.gwt.dev.DevMode.main(DevMode.java:311)
为什么？
Servlet 类 gaeTrader2.server.dao.DAOServletUser 不是 javax.servlet.Servlet
我的 Servlet 看起来像这样：
import java.io.IOException;
import java.io.PrintWriter;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.mortbay.log.Log;
public class DAOServletUser extends HttpServlet {
private static final Logger logger = Logger.getLogger(DAOServletUser.class.getCanonicalName());
/**
* Get the entities in JSON format.
*/
IDAOUser user;
/**
* Create the entity and persist it.
*/
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
logger.log(Level.INFO, "Creating User!!!");
PrintWriter out = resp.getWriter();
String email = req.getParameter("email");
String password = req.getParameter("password");
try {
user.insert(email, password);
Log.info("Inserted: " + email + " " + password);
} catch (Exception e) {
String msg = DAOUser.getErrorMessage(e);
out.print(msg);
}
}
}