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。

 

      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

 

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;

	@Persistent
	private User author;

	@Persistent
	private String content;

	@Persistent
	private Date date;

	@Persistent
	private 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>