在Grails中创建一个简单的Twitter应用程序（第1部分）(2.3.2版本实践)

本文是按照网上已有的案例来的:

http://blog.csdn.net/laoxue6699/article/details/9722111

但网上这个案例是2.0版本 并不适用2.3.2 实际上文中说的安装插件等命令在2.3.2中已经被弃用了

而且很多配置也产生较大的变化

具体过程和上面所给网址一样 本人也是刚刚接触grails 具体学习的资源就是官网的manual和stackoverflow中有关grails的问题等

如有错误 欢迎纠正

在安装好grails后 运行以下指令新建一个项目：

grails create-app simple-twitter  //在当前目录新建一个项目
cd simple-twitter //进入项目根目录

安装插件的方式已经改变了

现在的方式在grails-app/conf/buildConfig.groovy

在plugins下加入

compile ":spring-security-core:2.0-RC2"//不知道定位的先用 grails install-plugin spring-security-core 这个命令本身不会安装插件了 但会有相关安装插件的提示

 这样还不行 还得加入一个spring的repo

在repositories下加入:

mavenRepo 'http://repo.spring.io/milestone'

 好 先展现一下buildConfig.groovy的样子:

grails.servlet.version = "3.0" // Change depending on target container compliance (2.5 or 3.0)
grails.project.class.dir = "target/classes"
grails.project.test.class.dir = "target/test-classes"
grails.project.test.reports.dir = "target/test-reports"
grails.project.work.dir = "target/work"
grails.project.target.level = 1.6
grails.project.source.level = 1.6
//grails.project.war.file = "target/${appName}-${appVersion}.war"

/*
grails.project.fork = [
    // configure settings for compilation JVM, note that if you alter the Groovy version forked compilation is required
    //  compile: [maxMemory: 256, minMemory: 64, debug: false, maxPerm: 256, daemon:true],

    // configure settings for the test-app JVM, uses the daemon by default
    test: [maxMemory: 768, minMemory: 64, debug: false, maxPerm: 256, daemon:true],
    // configure settings for the run-app JVM
    run: [maxMemory: 768, minMemory: 64, debug: false, maxPerm: 256, forkReserve:false],
    // configure settings for the run-war JVM
    war: [maxMemory: 768, minMemory: 64, debug: false, maxPerm: 256, forkReserve:false],
    // configure settings for the Console UI JVM
    console: [maxMemory: 768, minMemory: 64, debug: false, maxPerm: 256]
]
*/

grails.project.dependency.resolver = "maven" // or ivy
grails.project.dependency.resolution = {
    // inherit Grails' default dependencies
    inherits("global") {
        // specify dependency exclusions here; for example, uncomment this to disable ehcache:
        // excludes 'ehcache'
    }
    log "error" // log level of Ivy resolver, either 'error', 'warn', 'info', 'debug' or 'verbose'
    checksums true // Whether to verify checksums on resolve
    legacyResolve false // whether to do a secondary resolve on plugin installation, not advised and here for backwards compatibility

    repositories {
        inherits true // Whether to inherit repository definitions from plugins

        grailsPlugins()
        grailsHome()
        mavenLocal()
        grailsCentral()
        mavenCentral()
        // uncomment these (or add new ones) to enable remote dependency resolution from public Maven repositories
        //mavenRepo "http://repository.codehaus.org"
        //mavenRepo "http://download.java.net/maven/2/"
        //mavenRepo "http://repository.jboss.com/maven2/"
		mavenRepo 'http://repo.spring.io/milestone' //spring的仓库
    }

    dependencies {
        // specify dependencies here under either 'build', 'compile', 'runtime', 'test' or 'provided' scopes e.g.
        // runtime 'mysql:mysql-connector-java:5.1.24'
		runtime 'mysql:mysql-connector-java:5.1.21' //这个是加mysql的依赖要用的话先把这个jar包放在根目录下的lib目录下
    }

    plugins {
        // plugins for the build system only
        build ":tomcat:7.0.42"

        // plugins for the compile step
        compile ":scaffolding:2.0.1"
        compile ':cache:1.1.1'
		compile ":spring-security-core:2.0-RC2" //这个是新增的

        // plugins needed at runtime but not for compilation
        runtime ":hibernate:3.6.10.3" // or ":hibernate4:4.1.11.2"
        runtime ":database-migration:1.3.8"
        runtime ":jquery:1.10.2"
        runtime ":resources:1.2.1"
        // Uncomment these (or add new ones) to enable additional resources capabilities
        //runtime ":zipped-resources:1.0.1"
        //runtime ":cached-resources:1.1"
        //runtime ":yui-minify-resources:0.1.5"
    }
}

接下来执行下

grails compile

然后就可以用s2-quickstart等命令了

grails s2-quickstart org.grails.twitter(这个是包名) Person Authority

 这样会在domain下产生三个领域对象

与链接中的文章不同 要在bootstrap中进行插入操作 必须使用事务:

import org.cc.twitter.*

class BootStrap {

    def init = { servletContext ->
         if (!Person.count()) {
            createData()
        }
    }
    def destroy = {
    }
	
   private void createData() {
   
    def userRole=null
    Authority.withTransaction{
      userRole = new Authority(authority: 'ROLE_USER').save()
	}
	/* The default password for all user. No need to encode here to avoid double encoding. */
	String password = 'password'
	Person.withTransaction{
	[yancy: 'Yancy Vance Paredes', john: 'John Doe', jane: 'Jane Smith'].each { userName, realname ->
		def user = new Person(username: userName, realname: realname, password: password, enabled: true).save()
		PersonAuthority.create user, userRole, true
	}
	}
}
}

接下去用grails run-app 或者run-app（交互模式下）

没问题的话 就可以看到界面了

但此时的logout那个链接点进去是405(不能使用get方法来logout) 这是spring-security-core 2中默认的

要改变规则在 config.groovy中加入:

grails.plugin.springsecurity.logout.postOnly = false

 然后stop-app再run-app 如果还不行 那么把交互模式关掉 再进去 我在这个步骤里 试了下用clean 结果再run-app的时候出现一堆错误 但是重新打开再进去 就完全没有问题了...

附:

1、如果执行run-app的操作 出现fork错误

那么把BuildConfig.groovy中的grails.project.fork给注释掉

2、在datasource.groovy中增加mysql支持:

dataSource {
    pooled = true
    driverClassName = "org.h2.Driver"
    username = "sa"
    password = ""
}

dataSource_mysql { 
	dialect = org.hibernate.dialect.MySQLDialect 
	driverClassName = 'com.mysql.jdbc.Driver' 
	username = 'root' 
	password = '' 
	url = 'jdbc:mysql://localhost:3306/grails_twitter' 
	dbCreate = 'update'  //只更新 不创建 
} 

hibernate {
    cache.use_second_level_cache = true
    cache.use_query_cache = false
    cache.region.factory_class = 'net.sf.ehcache.hibernate.EhCacheRegionFactory' // Hibernate 3
//    cache.region.factory_class = 'org.hibernate.cache.ehcache.EhCacheRegionFactory' // Hibernate 4
}

// environment specific settings
environments {
    development {
        dataSource {
            dbCreate = "create-drop" // one of 'create', 'create-drop', 'update', 'validate', ''
            url = "jdbc:h2:mem:devDb;MVCC=TRUE;LOCK_TIMEOUT=10000;DB_CLOSE_ON_EXIT=FALSE"
        }
    }
    test {
        dataSource {
            dbCreate = "update"
            url = "jdbc:h2:mem:testDb;MVCC=TRUE;LOCK_TIMEOUT=10000;DB_CLOSE_ON_EXIT=FALSE"
        }
    }
    production {
        dataSource {
            dbCreate = "update"
            url = "jdbc:h2:prodDb;MVCC=TRUE;LOCK_TIMEOUT=10000;DB_CLOSE_ON_EXIT=FALSE"
            properties {
               maxActive = -1
               minEvictableIdleTimeMillis=1800000
               timeBetweenEvictionRunsMillis=1800000
               numTestsPerEvictionRun=3
               testOnBorrow=true
               testWhileIdle=true
               testOnReturn=false
               validationQuery="SELECT 1"
               jdbcInterceptors="ConnectionState"
            }
        }
    }
}

 要是用mysql

只需在domain中加入

static mapping={
  datasource 'mysql'  
  //mapping还支持修改表明 修改列名等操作
  /*
  table '表名'
    columns {
      属性名 column:'列名'
    }
  */
}