语源科技BlogJava-feezh

eclipse 汉化方法

feezh — Fri, 12 Oct 2012 06:48:00 GMT

突然想汉化eclips试试，发现这篇文章，
http://blog.csdn.net/gqqnb/article/details/6412364，才知道eclipse有语言包，汗。。。
按照文章所说，在
http://www.eclipse.org/babel/downloads.php页面发现

点Eclipse help菜单---> software update

选Available Software选项卡，点击add site 新建新的地址资源，在地址里面填相应版本地址安装即可。

feezh 2012-10-12 14:48 发表评论

Servlet简单封装

feezh — Thu, 19 Jul 2012 01:10:00 GMT

摘要: 封装类Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->package com.weidu.servlet;import java.io.IOException;import javax.servlet.ServletException;import j... 阅读全文

feezh 2012-07-19 09:10 发表评论

[java经典算法题]有n个人围成一圈，顺序排号。从第一个人开始报数（从1到3报数），凡报到3的人退出圈子，问最后留下的是原来第几号的那位？

feezh — Mon, 11 Jun 2012 16:08:00 GMT

题目：有n个人围成一圈，顺序排号。从第一个人开始报数（从1到3报数），凡报到3的人退出圈子，问最后留下的是原来第几号的那位？

1package com.weidu.algorithms;
2
3import java.util.Arrays;
4import java.util.Scanner;
5
6/**
7 * @Title：
8 * @Description：
9 * @author Afei
10 * @date：日期：2012-6-10 时间：下午05:41:04
11 * @Copyright：西北师范大学纬度工作室 Copyright (c) 2012
12 * @version:1.0
13 */
14public class Qu3 {
15
16    /**
17     * 功能说明:1、有n个人围成一圈，顺序排号。从第一个人开始报数（从1到3报数），凡报到3的人退出圈子，

18     * 问最后留下的是原来第几号的那位。
19     *
20     * @Afei 2012-6-10
21     * @param args
22     */
23
24    public static void main(String[] args) {
25        // TODO Auto-generated method stub
26        Scanner input = new Scanner(System.in);
27        System.out.print("请输入总人数：");
28        int p = input.nextInt();
29        /**** 初始化人员 ***/
30        boolean[] per = new boolean[p];// boolean数组表示站成一圈的人，false表示退出
31        for (int i = 0; i < per.length; i++) {
32            per[i] = true;
33        }
34
35        /**** 报号 ***/
36        int t = 0, len = per.length;
37        while (len > 1) {
38            for (int i = 0; i < per.length; i++) {
39
40                if (per[i]) {
41                    t++;
42                    if (t == 3) {
43                        t = 0;
44                        per[i] = false;
45                        len--;
46                    }
47                }
48            }
49        }
50        /***** 结果 *****/
51        System.out.println("最后的情况：" + Arrays.toString(per));
52        for (int i = 0; i < per.length; i++) {
53            if (per[i]) {
54                System.out.println("原来喊的数：" + (i + 1) % 3);
55            }
56        }
57    }
58}
59

feezh 2012-06-12 00:08 发表评论

Java树形数据（或者说级联）分类

feezh — Tue, 29 May 2012 13:41:00 GMT

- 这几天做东西时遇到一个树形数据（或者说级联，不会描述了，就这么叫吧）分类的问题，开始有点纠结，后想到了一种方法实现，先分享出来，高手勿喷。

正文开始
现有三个类：分别是Chapter.java Section.java KnowledgePoint.java
Chapter.java

private Set sections = new HashSet(0);
public Set getSections() {
        return this.sections;
    }

public void setSections(Set sections) {
        this.sections = sections;
    }

Section.java

private Chapter chapter;
private Set knowledgePoints = new HashSet(0);
public Chapter getChapter() {
        return this.chapter;
    }

public void setChapter(Chapter chapter) {
        this.chapter = chapter;
    }
public Set getKnowledgePoints() {
        return this.knowledgePoints;
    }

public void setKnowledgePoints(Set knowledgePoints) {
        this.knowledgePoints = knowledgePoints;
    }

KnowledgePoint.java

private Section section;
public Section getSection() {
        return this.section;
    }

public void setSection(Section section) {
        this.section = section;
    }

可以看出章节有多个小节，小节有多个知识点。当取得知识点后怎么根据不同的章节和小节分类呢？

List<KnowledgePoint> kps = this.allService.getKnowledgePointService()
                .findPoints(kpIds);//取得所选择的知识点
            /********** 根据小节分类知识点 **********/            Map<Integer, Section> map = new HashMap<Integer, Section>();
        for (int i = 0; i < kps.size(); i++) {
            Section section = kps.get(i).getSection();
            Integer key = section.getId();
            if (!map.containsKey(key)) {
                section.getKnowledgePoints().clear();
                map.put(key, section);
            }
            map.get(key).getKnowledgePoints().add(kps.get(i));
        }
        /********** 根据章节分类小节 **********/
            Map<Integer, Chapter> cpMap = new HashMap<Integer, Chapter>();
        Iterator<Section> it = map.values().iterator();
        while (it.hasNext()) {
            Section section = it.next();
            Chapter chapter = section.getChapter();
            Integer key = chapter.getId();
            if (!cpMap.containsKey(key)) {
                chapter.getSections().clear();
                cpMap.put(key, chapter);
            }
            cpMap.get(key).getSections().add(section);
        }

feezh 2012-05-29 21:41 发表评论

远程备份数据库到本地

feezh — Tue, 29 May 2012 13:00:00 GMT

1.共享备份目录

（要共享的目录）右键——共享——特定用户
说明：在次选择的用户为下面建立通信时的用户名

2.建立通信

1master..xp_cmdshell 'net use \\计算机名\共享名密码 /user:计算机名\用户名'

3.备份数据库

1DECLARE @PATH NVARCHAR(2000)
2SET @PATH ='\\计算机名\共享名\' +Convert(Nvarchar,getDate(),112)+'.bak'
3backup database 数据库名 to disk=@PATH '

4.删除通信

1master..xp_cmdshell 'net use \\计算机名\共享名 /delete '

实现自动备份
SQL SERVER代理——作业——新建作业
第一步：常规：填写作业名称

第二步：步骤：填写步骤名称，选择类型为t-sql，填写sql命令。按前面步骤分开填写步骤。
注意：最后一步：修改成功时要执行的操作：
第三步：计划——新建，根据需要设置。
第四五六。。根据需要设置。

feezh 2012-05-29 21:00 发表评论

【转】org.hibernate.id.IdentifierGenerationException: ids for this class must be manually assigned before calling save(): ***(POJO类，及持久化类名)

feezh — Mon, 28 May 2012 02:14:00 GMT

错误篇1：
org.hibernate.id.IdentifierGenerationException: ids for this class must be manually assigned before calling save(): ***(POJO类，及持久化类名)

分析及解决：

你要操作的数据表中的id（即主键）的类型设置成了“自动增长类型”，而在你的

hibernate.cfg.xml中，id的生成方式是assigned，即

这种搭配是矛盾的！

主键的assigned生成方式由程序自动生成表的主键，即在你的测试程序中要调用setId()方法，且必

须在调用save()前调用（或者说在调用save()前必须指定id，其实就是说，主键值不能为空！）。
把主键的生成方式改为native，它的特征是能够根据底层数据库自动选择主键生成方式。
转自：http://www.iteye.com/topic/201035

feezh 2012-05-28 10:14 发表评论

解决 java.lang.NoSuchMethodError: org.objectweb.asm.ClassVisitor.visit(IILjava/lang/String;Ljava/lan

feezh — Sun, 27 May 2012 16:25:00 GMT

原因：spring2与hibernate3有asm-2.2.3.jar的冲突

解决方法：删除asm-2.2.3.jar

完整异常信息：

org.springframework.beans.factory.BeanCreationException:
Error creating bean with name 'sessionFactory' defined in ServletContext
resource [/WEB-INF/classes/applicationContext.xml]: Invocation of init method
failed; nested exception is org.hibernate.HibernateException: Unable to
instantiate default tuplizer
[org.hibernate.tuple.entity.PojoEntityTuplizer]
Caused by:

org.hibernate.HibernateException: Unable to instantiate default tuplizer
[org.hibernate.tuple.entity.PojoEntityTuplizer]
at
org.hibernate.tuple.entity.EntityTuplizerFactory.constructTuplizer(EntityTuplizerFactory.java:110)
at
org.hibernate.tuple.entity.EntityTuplizerFactory.constructDefaultTuplizer(EntityTuplizerFactory.java:135)
at
org.hibernate.tuple.entity.EntityEntityModeToTuplizerMapping.(EntityEntityModeToTuplizerMapping.java:56)
at
org.hibernate.tuple.entity.EntityMetamodel.(EntityMetamodel.java:323)
at
org.hibernate.persister.entity.AbstractEntityPersister.(AbstractEntityPersister.java:433)
at
org.hibernate.persister.entity.SingleTableEntityPersister.(SingleTableEntityPersister.java:109)
at
org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:55)
at
org.hibernate.impl.SessionFactoryImpl.(SessionFactoryImpl.java:231)
at
org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1313)
at
org.springframework.orm.hibernate3.LocalSessionFactoryBean.newSessionFactory(LocalSessionFactoryBean.java:805)
at
org.springframework.orm.hibernate3.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:745)
at
org.springframework.orm.hibernate3.AbstractSessionFactoryBean.afterPropertiesSet(AbstractSessionFactoryBean.java:134)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1203)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1172)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:427)
at
org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:249)
at
org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:155)
at
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:246)
at
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:160)
at
org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:285)
at
org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:352)
at
org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:246)
at
org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:189)
at
org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:49)
at
org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3934)
at
org.apache.catalina.core.StandardContext.start(StandardContext.java:4429)
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:526)
at
org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:987)
at
org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:909)
at
org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:495)
at
org.apache.catalina.startup.HostConfig.start(HostConfig.java:1206)
at
org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:314)
at
org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at
org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at
org.apache.catalina.core.StandardHost.start(StandardHost.java:722)
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:583)
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:
java.lang.reflect.InvocationTargetException
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
org.hibernate.tuple.entity.EntityTuplizerFactory.constructTuplizer(EntityTuplizerFactory.java:107)
...
47 more
Caused by:java.lang.NoSuchMethodError:
org.objectweb.asm.ClassVisitor.visit(IILjava/lang/String;Ljava/lang/String;[Ljava/lang/String;Ljava/lang/String;)V
at
net.sf.cglib.core.ClassEmitter.begin_class(ClassEmitter.java:77)
at
net.sf.cglib.core.KeyFactory$Generator.generateClass(KeyFactory.java:173)
at
net.sf.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25)
at
net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:216)
at
net.sf.cglib.core.KeyFactory$Generator.create(KeyFactory.java:145)
at
net.sf.cglib.core.KeyFactory.create(KeyFactory.java:117)
at
net.sf.cglib.core.KeyFactory.create(KeyFactory.java:108)
at
net.sf.cglib.core.KeyFactory.create(KeyFactory.java:104)
at
net.sf.cglib.proxy.Enhancer.(Enhancer.java:69)
at
org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.getProxyFactory(CGLIBLazyInitializer.java:117)
at
org.hibernate.proxy.pojo.cglib.CGLIBProxyFactory.postInstantiate(CGLIBProxyFactory.java:43)
at
org.hibernate.tuple.entity.PojoEntityTuplizer.buildProxyFactory(PojoEntityTuplizer.java:188)
at
org.hibernate.tuple.entity.AbstractEntityTuplizer.(AbstractEntityTuplizer.java:128)
at
org.hibernate.tuple.entity.PojoEntityTuplizer.(PojoEntityTuplizer.java:78)
...
52 more
2012-3-8 16:28:53 org.apache.catalina.core.StandardContext
listenerStart
严重: Exception sending context initialized event to listener
instance of class
org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.BeanCreationException:
Error creating bean with name 'sessionFactory' defined in ServletContext
resource [/WEB-INF/classes/applicationContext.xml]: Invocation of init method
failed; nested exception is org.hibernate.HibernateException: Unable to
instantiate default tuplizer
[org.hibernate.tuple.entity.PojoEntityTuplizer]
Caused by:
org.hibernate.HibernateException: Unable to instantiate default tuplizer
[org.hibernate.tuple.entity.PojoEntityTuplizer]
at
org.hibernate.tuple.entity.EntityTuplizerFactory.constructTuplizer(EntityTuplizerFactory.java:110)
at
org.hibernate.tuple.entity.EntityTuplizerFactory.constructDefaultTuplizer(EntityTuplizerFactory.java:135)
at
org.hibernate.tuple.entity.EntityEntityModeToTuplizerMapping.(EntityEntityModeToTuplizerMapping.java:56)
at
org.hibernate.tuple.entity.EntityMetamodel.(EntityMetamodel.java:323)
at
org.hibernate.persister.entity.AbstractEntityPersister.(AbstractEntityPersister.java:433)
at
org.hibernate.persister.entity.SingleTableEntityPersister.(SingleTableEntityPersister.java:109)
at
org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:55)
at
org.hibernate.impl.SessionFactoryImpl.(SessionFactoryImpl.java:231)
at
org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1313)
at
org.springframework.orm.hibernate3.LocalSessionFactoryBean.newSessionFactory(LocalSessionFactoryBean.java:805)
at
org.springframework.orm.hibernate3.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:745)
at
org.springframework.orm.hibernate3.AbstractSessionFactoryBean.afterPropertiesSet(AbstractSessionFactoryBean.java:134)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1203)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1172)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:427)
at
org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:249)
at
org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:155)
at
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:246)
at
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:160)
at
org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:285)
at
org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:352)
at
org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:246)
at
org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:189)
at
org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:49)
at
org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3934)
at
org.apache.catalina.core.StandardContext.start(StandardContext.java:4429)
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:526)
at
org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:987)
at
org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:909)
at
org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:495)
at
org.apache.catalina.startup.HostConfig.start(HostConfig.java:1206)
at
org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:314)
at
org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at
org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at
org.apache.catalina.core.StandardHost.start(StandardHost.java:722)
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:583)
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:
java.lang.reflect.InvocationTargetException
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
org.hibernate.tuple.entity.EntityTuplizerFactory.constructTuplizer(EntityTuplizerFactory.java:107)
...
47 more
Caused by:java.lang.NoSuchMethodError:
org.objectweb.asm.ClassVisitor.visit(IILjava/lang/String;Ljava/lang/String;[Ljava/lang/String;Ljava/lang/String;)V
at
net.sf.cglib.core.ClassEmitter.begin_class(ClassEmitter.java:77)
at
net.sf.cglib.core.KeyFactory$Generator.generateClass(KeyFactory.java:173)
at
net.sf.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25)
at
net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:216)
at
net.sf.cglib.core.KeyFactory$Generator.create(KeyFactory.java:145)
at
net.sf.cglib.core.KeyFactory.create(KeyFactory.java:117)
at
net.sf.cglib.core.KeyFactory.create(KeyFactory.java:108)
at
net.sf.cglib.core.KeyFactory.create(KeyFactory.java:104)
at
net.sf.cglib.proxy.Enhancer.(Enhancer.java:69)
at
org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.getProxyFactory(CGLIBLazyInitializer.java:117)
at
org.hibernate.proxy.pojo.cglib.CGLIBProxyFactory.postInstantiate(CGLIBProxyFactory.java:43)
at
org.hibernate.tuple.entity.PojoEntityTuplizer.buildProxyFactory(PojoEntityTuplizer.java:188)
at
org.hibernate.tuple.entity.AbstractEntityTuplizer.(AbstractEntityTuplizer.java:128)
at
org.hibernate.tuple.entity.PojoEntityTuplizer.(PojoEntityTuplizer.java:78)
...
52 more

认真阅读错误信息，一般在最后都能找到答案的！

feezh 2012-05-28 00:25 发表评论