搭建第一個web項目：實現用戶的增刪改查

　　好久沒寫這個web的代碼了，再不寫估計以前的也忘記的差不多了，趕緊復習下，順便把自己的想法慢慢實現了。

　　最近在公司發現以前的項目有用easyUI搭建的。趕緊copy回來學習下。

　　感覺寫日志真的很有必要，自己總結的肯定要比每次從網上查閱來的靠譜。每次搭建一個基本的web項目都都要查ssh的配置真的很憂傷啊，有木有！！！

　　把jar包的截圖截了一下，要不總是記不清該用到的基本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

　　因為用到的是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必須包：antlr.jar  commons-collection.jar dom4j.jar  javassist.jar  jta.jar  slf-4j.jar  數據庫連接池:c3p0  數據庫驅動jdbc:mysql-connector.jar 

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

　　其他的插件包需要的時候一個一個添加，上面的是最基本的。

　　好了，這回基本jar包也記錄下來了。下面開始好好研究下公司項目，實現最基本的用戶增刪改查了。

　　現在最麻煩的就是項目里的基礎通用類不知道該怎么部署，啊啊啊啊啊！！！！

　　

　　馬丹，把項目拷到公司電腦上之后包了個這個錯誤，我也是醉了好不，明明都是一樣的MySQL和Eclipse，為啥就不行了呢。荒廢了我一下午也知道錯在哪了。網上說事MySQL版本太低了，或是dialect沒寫對，可是改了也是不行啊，真心不知道哪里錯了，只能回家看看原先的數據庫是設置的什么字符集了，或許是MyEclipse中的某些字符集設置導致的問題吧，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，回家這個項目根本沒有數據庫字符集的問題。先不管這個問題了。這章可是要寫實現數據的增刪改查啊。

項目中用到了easyUI前台框架，寫一下后台action向前台返回jason格式的代碼：

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，封裝了一個EasyGridData類，該類是為了實現easyUI數據表格分頁。EasyGridData代碼如下：

package cn.itcast.oa.domain;

import java.util.ArrayList;
import java.util.List;
/**
 * 實現easyUI數據表格分頁
 * @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;
    }
}

　　為什么要封裝一個這樣的類呢，因為在一開始沒有分頁的情況時，我直接返回roleList，easyUI表格照樣可以解析數據，將返回到前台的jason串顯示出來。可是當加入分頁后，返回到前台的數據串編程一個類似二維數組的東西，roleList里面的數據，easyUI顯示不出來了，封裝這個類之后吧List中的數據放到了rows中，easyUI又可以顯示出來了，說明，在前台esayUI中，只能識別固定形式的json串。

通過以上，實現了easyUI分頁顯示數據。實現了基本的查詢功能。