tapestry中实现ajax的增删改查实例

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model类：

package example.hellotapestry.model; public class UserLog {public UserLog(){}public UserLog(String name,String sex ,int age ,String email){this.name = name ;this.sex = sex ;this.age = age ;this.mail = email ;}private String name ;public String getName() {return name;}public void setName(String name) {this.name = name;}public String getSex() {return sex;}public void setSex(String sex) {this.sex = sex;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public String getMail() {return mail;}public void setMail(String mail) {this.mail = mail;}private String sex ;private int age ;private String mail ;}

页面类：

package example.hellotapestry.pages;import java.util.ArrayList;import java.util.List;import org.apache.tapestry5.annotations.Component;import org.apache.tapestry5.annotations.InjectComponent;import org.apache.tapestry5.annotations.Persist;import org.apache.tapestry5.annotations.Property;import org.apache.tapestry5.beaneditor.BeanModel;import org.apache.tapestry5.corelib.components.Grid;import org.apache.tapestry5.corelib.components.Zone;import org.apache.tapestry5.ioc.Messages;import org.apache.tapestry5.ioc.annotations.Inject;import org.apache.tapestry5.services.BeanModelSource;import org.apache.tapestry5.services.Request;import example.hellotapestry.model.UserLog;public class Test {@Property private String name = "Hello Word" ;@Property@Injectprivate Request request;@Injectprivate BeanModelSource _modelSource;@Injectprivate Messages messages;@Propertyprivate UserLog userlog = new UserLog() ;@Persist@Propertyprivate List<UserLog> itemUSer;@Component(parameters = { "source=itemUSer", "rowsPerPage=14","model=modelForGrid" })private Grid grid;void setupRender(){System.out.println("进入 Test setupRender方法");itemUSer = new ArrayList<UserLog>();itemUSer.add(new UserLog("zhangsan", "男", 16, "zhangsan@163.com"));itemUSer.add(new UserLog("lisi", "女", 20, "lisi@163.com"));itemUSer.add(new UserLog("longyingan", "男", 23, "longyingan@163.com"));itemUSer.add(new UserLog("hudou", "女", 21, "hudou@163.com"));}/** * 设置 Grid显示模式对应grid的参数 model=modelForGrid * 结论：由此可得到在参数配置中，参数的赋值是支持方法的调用 * 方法对应名称为 getXXX()；只要返回的对象是对应属性的类型就OK * @return */public BeanModel getModelForGrid() {BeanModel result = _modelSource.createEditModel(UserLog.class,messages); result.get("name").label("名字").sortable(true); result.get("sex").label("性别").sortable(false); result.get("age").label("年龄").sortable(false); result.get("mail").label("邮件地址").sortable(false);return result;}@InjectComponentprivate Zone userlistZone ;Object onActionFromClicker(String name){System.out.println("--------进入：name：+"+name);for (UserLog ulog : itemUSer) {if (ulog.getName().equals(name)) {System.out.println("success:"+name);itemUSer.remove(ulog);break ;}} return userlistZone;}Object onActionFromRegForm(){System.out.println("aaaaaaaaaaaaaa");if (nameE!=null&&!"".equals(nameE.trim())) {for (UserLog ulog : itemUSer) {if (ulog.getName().equals(nameE)) {System.out.println("Edit:"+nameE);ulog.setName(userlog.getName());ulog.setAge(userlog.getAge());ulog.setSex(userlog.getSex());ulog.setMail(userlog.getMail());nameE = null ;userlog = new UserLog();}}}else{ itemUSer.add(this.userlog);}return userlistZone; //return null ;}@InjectComponentprivate Zone infoEditZone ;private static String nameE ;Object onActionFromEdit(String name){for (UserLog ulog : itemUSer) {if (ulog.getName().equals(name)) {System.out.println("success:"+name);this.userlog = ulog;nameE = ulog.getName() ;}} return infoEditZone;}}

页面代码：

<html xmlns="http://www.w3.org/1999/xhtml" xmlns:t="http://tapestry.apache.org/schema/tapestry_5_1_0.xsd" xmlns:p="tapestry:parameter" ><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>正在进入</title></head><body><t:zone t:id="userlistZone" id="userlistZone"><table t:id="grid" add="edit" row="userlog" reorder="name,sex,age,mail,edit" model="userlog" pagerPosition="bottom" > <p:editHeader>操作 </p:editHeader> <p:editcell> <t:actionlink t:id="clicker" context="userlog.name" zone="userlistZone">删除</t:actionlink> <t:actionlink t:id="edit" context="userlog.name" zone="infoEditZone">编辑</t:actionlink> </p:editcell></table></t:zone><div> <t:zone t:id="infoEditZone" id="infoEditZone"> <t:form t:id="regForm" clientValidation="true" zone="userlistZone"> uname:<t:textfield t:id="name" value="userlog.name" /><br/> sex:<t:textfield t:id="sex" value="userlog.sex" /><br/> age:<t:textfield t:id="age" value="userlog.age" /><br/> mail:<t:textfield t:id="mail" value="userlog.mail" /><br/> <t:submit id="register" value="SUBMIT" /> </t:form> </t:zone></div></body></html>

使用方法：下面的form表单做了两件事情，有添加和编辑！如果你点击了上面的编辑下面的提交做修改操作。否则做添加操作。

我在做的过程中有一个疑问：我在做删除的时候，为什么我不加那个 break ，那么在删除的时候我们删最后一条会报错了！不知道这个错误时什么原因…… 我估计是 List导致的！不知道大家有什么见解？？

经过初步分析得出报错的原因：因为我在删除的时候是在去遍历 List，然而我在里面有 remove 一个List里面的对象。从而导致线程不同步异常。java.util.ConcurrentModificationException ！所以说尽量不要采用这种方法来删除！但是在现实操作中我相信不会出现，因为我们不会这样去删除数据。

作者：龙映安

所属公司：云软网络