当我向我的 servlet 发出 get 请求时，我得到了这样的响应：此 URL 不支持 HTTP 方法 GET。在本地我有同样的错误，但随后有查询的输出这是代码：
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.google.appengine.api.datastore.DatastoreService;
import com.google.appengine.api.datastore.DatastoreServiceFactory;
import com.google.appengine.api.datastore.Entity;
import com.google.appengine.api.datastore.Key;
import com.google.appengine.api.datastore.KeyFactory;
/**
* This servlet responds to the request corresponding to users. The class
* creates and manages the User Entity
*
* @author
*/
@SuppressWarnings("serial")
public class UserServlet extends HttpServlet {
private static final Logger logger = Logger.getLogger(UserServlet.class.getCanonicalName());
/**
* Get the requested customer entities in JSON format
*/
@Override
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
super.doGet(req, resp);
logger.log(Level.INFO, "Obtaining Customer listing");
String searchFor = req.getParameter("username");
String password= req.getParameter("password");
PrintWriter out = resp.getWriter();
Iterable<Entity> entities = null;
if (searchFor == null || searchFor.equals("")) {
// entities = User.getAllUsers();
// out.println(Util.writeJSON(entities));
} else {
entities = User.getUser(searchFor);
Entity result=entities.iterator().next();
if(result!=null){
if(result.getProperty("password").equals(password)){
out.println(Util.writeJSON(entities));
// resp.sendError(HttpServletResponse.SC_ACCEPTED);
}else{
resp.sendError(HttpServletResponse.SC_BAD_REQUEST);
}
}else{
resp.sendError(HttpServletResponse.SC_BAD_REQUEST);
}
}
return;
}
/**
* Insert the new customer
*/
protected void doPut(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
logger.log(Level.INFO, "Creating Customer");
String firstName = req.getParameter("name");
String lastName = req.getParameter("surname");
String phone = req.getParameter("phone");
String address = req.getParameter("address");
String city = req.getParameter("city");
String state = req.getParameter("state");
String zip = req.getParameter("zip");
String email = req.getParameter("email");
String username=req.getParameter("username");
String password=req.getParameter("password");
User.createOrUpdateCustomer( firstName, lastName, phone, address, city, state, zip, email, username, password);
}
/**
* Delete the customer
*/
protected void doDelete(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
String customerName = req.getParameter("id");
logger.log(Level.INFO, "Deleting User {0}", customerName);
Key key = KeyFactory.createKey("Customer", customerName);
try {
//CASCADE_ON_DELETE
Iterable<Entity> entities = Util.listChildKeys("Order", key);
final List<Key> orderkeys = new ArrayList<Key>();
final List<Key> linekeys = new ArrayList<Key>();
for (Entity e : entities) {
orderkeys.add(e.getKey());
Iterable<Entity> lines = Util.listEntities("LineItem", "orderID",String.valueOf(e.getKey().getId()));
for(Entity en : lines){
linekeys.add(en.getKey());
}
}
Util.deleteEntity(linekeys);
Util.deleteEntity(orderkeys);
Util.deleteFromCache(key);
Util.deleteEntity(key);
} catch (Exception e) {
String msg = Util.getErrorResponse(e);
resp.getWriter().print(msg);
}
}
/**
* Redirect the call to doDelete or doPut method
*/
@Override
public void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
String action = req.getParameter("action");
//resp.getWriter().print(req.getParameterMap());
//resp.getWriter().print(action);
if (action.equalsIgnoreCase("delete")) {
doDelete(req, resp);
return;
} else if (action.equalsIgnoreCase("registra")) {
doPut(req, resp);
resp.sendError(2);
resp.sendRedirect("/index.jsp");
return;
}
doGet(req, resp);
}
}
看了几篇帖子，没有找到答案