搭建第一个web项目：实现用户的增删改查

　　好久没写这个web的代码了，再不写估计以前的也忘记的差不多了，赶紧复习下，顺便把自己的想法慢慢实现了。

　　最近在公司发现以前的项目有用easyUI搭建的。赶紧copy回来学习下。

　　感觉写日志真的很有必要，自己总结的肯定要比每次从网上查阅来的靠谱。每次搭建一个基本的web项目都都要查ssh的配置真的很忧伤啊，有木有！！！

　　把jar包的截图截了一下，要不总是记不清该用到的基本jar有啥。

　　

　　其中Struts中用到的jar有：commons-fileupload.jar  commons-io.jar  freemarker.jar  ognl.jar  struts2-core.jar  xwork-core.jar

　　因为用到的是Struts的注解形式，所以加入了Struts的插件jar：struts2-convention-plugin.jar

　　hibernate中用到的jar有：hibernate核心包：hibernate.jar  hibernate必须包：antlr.jar  commons-collection.jar dom4j.jar  javassist.jar  jta.jar  slf-4j.jar  数据库连接池:c3p0  数据库驱动jdbc:mysql-connector.jar 

　　spring中用到的jar有：核心包：spring.jar  AOP:aspectjrt.jar  aspectjweaver.jar 动态代理（和aop也有关）cglib.jar  日志有关commons-logging.jar

　　其他的插件包需要的时候一个一个添加，上面的是最基本的。

　　好了，这回基本jar包也记录下来了。下面开始好好研究下公司项目，实现最基本的用户增删改查了。

　　现在最麻烦的就是项目里的基础通用类不知道该怎么部署，啊啊啊啊啊！！！！

　　

　　马丹，把项目拷到公司电脑上之后包了个这个错误，我也是醉了好不，明明都是一样的MySQL和Eclipse，为啥就不行了呢。荒废了我一下午也知道错在哪了。网上说事MySQL版本太低了，或是dialect没写对，可是改了也是不行啊，真心不知道哪里错了，只能回家看看原先的数据库是设置的什么字符集了，或许是MyEclipse中的某些字符集设置导致的问题吧，啊啊啊蛋疼。。。

17:33:20,483  WARN JDBCExceptionReporter:233 - SQL Error: 0, SQLState: null
17:33:20,486 ERROR JDBCExceptionReporter:234 - Cannot create PoolableConnectionFactory (Unknown character set: 'utf8mb4')
17:33:20,488  WARN SettingsFactory:147 - Could not obtain connection to query metadata
org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Unknown character set: 'utf8mb4')
    at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1225)
    at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880)
    at org.springframework.orm.hibernate3.LocalDataSourceConnectionProvider.getConnection(LocalDataSourceConnectionProvider.java:82)
    at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:114)
    at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2833)
    at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2829)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1840)
    at org.springframework.orm.hibernate3.LocalSessionFactoryBean.newSessionFactory(LocalSessionFactoryBean.java:814)
    at org.springframework.orm.hibernate3.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:732)
    at org.springframework.orm.hibernate3.AbstractSessionFactoryBean.afterPropertiesSet(AbstractSessionFactoryBean.java:211)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1369)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1335)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:473)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409)
    at java.security.AccessController.doPrivileged(Native Method)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:264)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:261)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:423)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:728)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:380)
    at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:255)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:199)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:45)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3827)
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4334)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:525)
    at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:920)
    at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:883)
    at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:492)
    at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1138)
    at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
    at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
    at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
    at org.apache.catalina.core.StandardService.start(StandardService.java:516)
    at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:566)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown character set: 'utf8mb4'
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
    at com.mysql.jdbc.Util.getInstance(Util.java:386)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1052)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3609)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3541)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2002)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2163)
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2618)
    at com.mysql.jdbc.ConnectionImpl.configureClientCharacterSet(ConnectionImpl.java:1880)
    at com.mysql.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:3499)
    at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2384)
    at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2153)
    at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:792)
    at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
    at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:381)
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:305)
    at org.apache.commons.dbcp.DriverConnectionFactory.createConnection(DriverConnectionFactory.java:38)
    at org.apache.commons.dbcp.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:294)
    at org.apache.commons.dbcp.BasicDataSource.validateConnectionFactory(BasicDataSource.java:1247)
    at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1221)
    ... 50 more
2015-6-15 17:33:22 org.apache.coyote.http11.Http11Protocol start
信息: Starting Coyote HTTP/1.1 on http-8080
2015-6-15 17:33:22 org.apache.jk.common.ChannelSocket init
信息: Port busy 8009 java.net.SocketException: Unrecognized Windows Sockets error: 0: JVM_Bind
2015-6-15 17:33:22 org.apache.jk.common.ChannelSocket init
信息: JK: ajp13 listening on /0.0.0.0:8010
2015-6-15 17:33:22 org.apache.jk.server.JkMain start
信息: Jk running ID=1 time=0/11  config=null
2015-6-15 17:33:22 org.apache.catalina.startup.Catalina start
信息: Server startup in 4954 ms

 蛋疼的，回家这个项目根本没有数据库字符集的问题。先不管这个问题了。这章可是要写实现数据的增删改查啊。

项目中用到了easyUI前台框架，写一下后台action向前台返回jason格式的代码：

package cn.itcast.oa.action;

import javax.annotation.Resource;

import org.apache.struts2.convention.annotation.Action;
import org.apache.struts2.convention.annotation.Namespace;
import org.apache.struts2.convention.annotation.ParentPackage;
import org.apache.struts2.convention.annotation.Result;
import org.apache.struts2.convention.annotation.Results;

import cn.itcast.oa.base.BaseAction;
import cn.itcast.oa.domain.EasyGridData;
import cn.itcast.oa.domain.Role;
import cn.itcast.oa.service.RoleService;

@Namespace("/jsp/role")
@ParentPackage("json-default")
@Action(value = "/roleAction")
@Results({
    @Result(name = "success", type = "json",params = { "root", "gridData" })
})
public class RoleAction extends BaseAction<Role> {

    private static final long serialVersionUID = 1L;

    @Resource
    private RoleService roleService;
    
    private EasyGridData<Role> gridData = new EasyGridData<Role>();
    @Override
    public String execute() throws Exception {
//         roleList = roleService.findAll();
        gridData.setRows(roleService.findAllByPage(this.page,this.rows)) ;
        gridData.setTotal( roleService.findAll().size());
//        ActionContext.getContext().put("roleList", roleList);
        return "success";

    }

    public EasyGridData<Role> getGridData() {
        return gridData;
    }
    public void setGridData(EasyGridData<Role> gridData) {
        this.gridData = gridData;
    }

}

其中，封装了一个EasyGridData类，该类是为了实现easyUI数据表格分页。EasyGridData代码如下：

package cn.itcast.oa.domain;

import java.util.ArrayList;
import java.util.List;
/**
 * 实现easyUI数据表格分页
 * @author haojiahong
 *
 * @param <T>
 */
public class EasyGridData<T> {
    private int total=0;
    private List<T> rows = new ArrayList<T>();
    private String msg;
    public List<T> getRows() {
        return rows;
    }

    public void setRows(List<T> rows) {
        this.rows = rows;
    }

    
    public int getTotal() {
        return total;
    }

    
    public void setTotal(int total) {
        this.total = total;
    }

    
    public String getMsg() {
        return msg;
    }

    
    public void setMsg(String msg) {
        this.msg = msg;
    }
}

　　为什么要封装一个这样的类呢，因为在一开始没有分页的情况时，我直接返回roleList，easyUI表格照样可以解析数据，将返回到前台的jason串显示出来。可是当加入分页后，返回到前台的数据串编程一个类似二维数组的东西，roleList里面的数据，easyUI显示不出来了，封装这个类之后吧List中的数据放到了rows中，easyUI又可以显示出来了，说明，在前台esayUI中，只能识别固定形式的json串。

通过以上，实现了easyUI分页显示数据。实现了基本的查询功能。