PlayFramework完整实现一个APP（九）

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我是靠谱客的博主大气自行车，最近开发中收集的这篇文章主要介绍PlayFramework完整实现一个APP（九），觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

添加增删改查操作

1.开启CRUD Module

在/conf/application.conf 中添加

# Import the crud module
module.crud=${play.path}/modules/crud

在/conf/routes 中添加

# Import CRUD routes
* /admin module:crud

需要重启Server，导入CRUD Module

2.添加控制器

/app/controllers

import play.*;import play.mvc.*;
public class Posts extends CRUD {
}public class Tags extends CRUD {
}public class Users extends CRUD {
}public class Comments extends CRUD {
}

可能会提示错误： CRUD 无法解析为类型并且运行程序会提示错误

解决办法：

修改 conf/dependencies.yml

require:
- play
- play -> crud

运行Shell

> play dependencies

工程下会生成 modules/crud 文件，重新启动工程即可，但是编译还是会出错，可能是没有引用crud工程的原因

3.创建Controller

package controllers;import models.User;

@CRUD.For(User.class)public class AdminUsers extends CRUD {

}

4.修改Model，添加验证

以User为例

public class User extends Model {
@Email
@Required public String email;

@Required
@PassWord
public String password; public String fullname; public String isAdmin; public String toString() { return email;
}
}

进入http://localhost:9000/admin/ 选择add user进入 User Form进行测试

public class Post extends Model {
@Required public String title;

@Required public Date postedAt;

@Lob
@Required
@MaxSize(10000) public String content;

@Required
@ManyToOne public User author;

@OneToMany(mappedBy = "post", cascade = CascadeType.ALL) public List<Comment> comments;

@ManyToMany(cascade = CascadeType.PERSIST) public Set<Tag> tags;
}

public class Tag extends Model implements Comparable<Tag> {

@Required public String name;
}

public class Comment extends Model {
@Required public String author;

@Required public Date postedAt;

@Lob
@Required
@MaxSize(10000) public String content;

@ManyToOne
@Required public Post post;
}

5.页面上显示的Label名字是小写，与对应类的字段名一致，如果想显示大写，可以修改/conf/messages

title=Title
content=Content
postedAt=Posted at
author=Author
post=Related post
tags=Tags set
name=Common name
email=Email
password=Password
fullname=Full name
isAdmin=User is admin