体验GAE springMVC
????? 把gae java的教程例子改了一下，用springMVC写的，目前只是个半成品，现在bug是点击submit才能看到所有留言，点击两次submit才能看到自己发的留言。
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????? 因为是springMVC是第一次接触，写的不好
，东西是今天上悄悄改的，页面也没仔细弄，下午还得去忙工作。有时间再改吧。
????? 怎么配置gae spring 参考的是这篇帖子http://sikeh.iteye.com/blog/364043
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由于东西bug比较多，就贴几个主要代码。具体配置参考上面给的链接，写的很详细了 呵呵、
bean
package com.fish.gae.entity;import java.util.Date;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;import com.google.appengine.api.users.User;@PersistenceCapable(identityType = IdentityType.APPLICATION)public class Comment {@PrimaryKey@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)private Long id;@Persistentprivate User author;@Persistentprivate String content;@Persistentprivate Date date;@Persistentprivate String commentDate;public Comment(User author, Date date, String content,String commentDate) {this.author = author;this.content = content;this.date = date;this.commentDate =commentDate;}public Long getId() {return id;}public void setId(Long id) {this.id = id;}public User getAuthor() {return author;}public void setAuthor(User author) {this.author = author;}public String getContent() {return content;}public void setContent(String content) {this.content = content;}public Date getDate() {return date;}public void setDate(Date date) {this.date = date;}public String getCommentDate(){return commentDate;}public void setCommentdate(String commentDate){this.commentDate = commentDate;}}?
controller
package com.fish.gae.controller;import java.text.SimpleDateFormat;import java.util.Date;import java.util.List;import java.util.logging.Logger;import javax.jdo.PersistenceManager;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.web.bind.annotation.ModelAttribute;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import com.fish.gae.entity.Comment;import com.fish.gae.entity.PMF;import com.google.appengine.api.users.User;import com.google.appengine.api.users.UserService;import com.google.appengine.api.users.UserServiceFactory;@Controller@RequestMapping(value = "/commentAdd.htm")public class CommentController {private static final Logger log = Logger.getLogger(CommentController.class.getName());@RequestMapping(method = RequestMethod.POST)public String doPost(String content, Model model) {UserService userService = UserServiceFactory.getUserService();User user = userService.getCurrentUser();Date date = new Date(); SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm"); String commentDate = sdf.format(new Date());model.addAttribute("content", content);Comment comment = new Comment(user, date, content,commentDate);PersistenceManager pm = PMF.get().getPersistenceManager();try {pm.makePersistent(comment);} finally {pm.close();}return "comment";}@ModelAttribute("comments")public List<Comment> doGet(Model model) {UserService userService = UserServiceFactory.getUserService();User user = userService.getCurrentUser();PersistenceManager pm = PMF.get().getPersistenceManager();String query = "select from " + Comment.class.getName();List<Comment> comments = (List<Comment>)pm.newQuery(query).execute();if(comments.isEmpty()){String message= "没有留言";System.out.print(message);}else{for(Comment co : comments){if(co.getAuthor()==null){String author = "火星人";}else{ co.getAuthor().getNickname();}co.getContent();}}return comments;}}?页面 comment.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%><%@ page isELIgnored="false"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title></title></head><body><c:forEach items="${comments}" var="comments" varStatus="status"><c:out value="${comments.content}"></c:out><c:out value="${comments.commentDate}"></c:out></c:forEach><form action="commentAdd.htm" method="post"><table><tr><td>comment</td><td><textarea rows="3" cols="10" name="content"></textarea></td></tr><tr><td><input type="submit" value="Submit" /></td></tr></table></form></body></html>?