Category Java

Spring知识集锦

配置

Spring各种注入方式的区别

注入方式	说明
@Resource	来源：JSR250 (Common Annotations for Java) 注入方式：默认byName注入通过@Qualifier可以强制 byQualifier。注意：如果byQual…

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14 years ago

Java

Dom4j知识集锦

如何禁止加载XSD和DTD

1 2	SAXReader reader = new SAXReader( true ); reader.setFeature( Constants.XERCES_FEATURE_PREFIX + Constants.LOAD_EXTERNAL_DTD_FEATURE, false );

DTD验证，无法联网时报错

通过指定本地的DTD文档来解决：

SAXReader reader = new SAXReader( true );

reader.setEntityResolver( new EntityResolver() {

public InputSource resolveEntity( String publicId, String systemId )

{

if ( publicId.equals( "-//Hibernate/Hibernate Mapping DTD 3.0//EN" ) )

{

InputStream in = getClass().getResourceAsStream( "/hibernate-mapping-3.0.dtd" );

return new InputSource( in );

}

return null;

}

} );

使用JAXP来进行XSD验证

Dom4j如何格式化XML输出

如何使用XPath解析带名字空间的XML

Dom4j访问者模式中，删除节点导致NullPointerException

报错：java.lang.NullPointerException at org.dom4j.tree.AbstractElement.accept(AbstractElement.java:208) 解决：在访问者中记录需要删除的节点，访问结束后一… 阅读全文

14 years ago

Java

Hibernate基于注解的配置样例

实体类上的常用注解

@Entity ( name = "ChristmasTree" )

@Table ( name = "T_CRISMS_TREE" )

//给自动生成的表添加注释

@org.hibernate.annotations.Table ( appliesTo = "T_CRISMS_TREE", comment = "圣诞树" )

@Cacheable //JPA注解，表示该类型的实体支持缓存

//启用二级缓存时有意义，指定Hibernate缓存策略、存放区域

@Cache ( usage = CacheConcurrencyStrategy.READ_WRITE, region = "entityCache" )

public class ChristmasTree

{

//集合属性的缓存策略必须单独配置

@Cache ( usage = CacheConcurrencyStrategy.READ_WRITE, region = "entityCache" )

private List branches;

}

使用注解方式进行对象-数据库映射时，应当以JPA注解为主，仅Hibernate特有的功能则使用其私有的注解类。

简单主键和简单属性映射

//简单的主键映射

@Id //该注解指明此实体的标识符属性，对应了关系型数据库的主键

@Column ( name = "ID", columnDefinition = "int(11) comment '主键'" )

private Integer id;

//UUID方式的主键生成器配置，其它任何自定义的主键生成器可以依样扩展

@Id

@Column ( name = "ID", columnDefinition = "varchar(36) comment '主键,36位UUID'" )

@GeneratedValue ( generator = "uuid" )

@GenericGenerator ( name = "uuid", strategy = "org.hibernate.id.UUIDGenerator" )

private String id;

//可以指定普通属性的延迟加载

@Basic ( fetch = FetchType.EAGER, optional = true )

@Column ( name = "BUILD_COST", columnDefinition = "decimal(10,2) comment '建造费用'" )

private BigDecimal buildCost;

//时间映射

//只能用于java.util.Date或者java.util.Calendar，用于表示日期、时间或者时间戳

@Temporal ( TemporalType.TIMESTAMP )

@Column ( name = "BUILD_TIME", columnDefinition = "datetime comment '建造时间'" )

private Date buildTime;

//大字段映射

@Lob

@Column ( name = "REMARK", columnDefinition = "longtext comment '圣诞树备注信息'" )

private String remark;

//枚举类型映射

@Enumerated ( EnumType.ORDINAL )

//根据枚举元素的声明顺序，从0开始

@Column ( name = "STATUS", columnDefinition = "tinyint comment '状态'" )

private Status status;

//乐观并发控制用列

@Version

@Column ( name = "VERSION" )

public Integer version;

复合主键映射

嵌入式（embeddable）对象映射

关联映射

继承映射

其它注解

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14 years ago

Java

使用Eclipse进行远程调试

一些基础知识

JPDA(Java Platform Debugger Architecture)是实现Java远程调试的基础，它是一个CS架构，包含三个组件：

JVMTI（JVM Tool Interface ）：服务端，即debuggee端。该接口代替JDK…

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15 years ago

Java

JProfiler学习笔记

剖析视图

内存视图（Memory Views）

该视图专注于对象的内存分配情况，包含以下选项卡：

All Objects

显示堆中实时的对象情况：显示某种类型（聚合级别可以是类、包等）对象的数量（Instance Count）、浅尺寸（Shallow size）…

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15 years ago

Java

Maven POM文件配置示例

排除传递性依赖

<groupId>org.apache.cxf</groupId>

<artifactId>cxf-rt-transports-http</artifactId>

<groupId>org.springframework</groupId>

<artifactId>spring-web</artifactId>

</exclusion>

</exclusions>

</dependency>

指定资源文件目录并过滤

<build>

<directory>target</directory>

<outputDirectory>target/classes</outputDirectory>

<testOutputDirectory>target/test-classes</testOutputDirectory>

</excludes>

</resource>

<directory>src/main/resources</directory>

</resource>

</resources>

<directory>src/test/resources</directory>

</testResource>

</testResources>

</build>

指定额外的源代码目录

过滤资源文件

配置目录链接（Linked Folder）

打包时生成*–sources.jar

打包时生成*–javadoc.jar

指定编译级别

启用对AspectJ的支持

指定源代码、资源文件的编码方式

打包时拷贝所有依赖包

打包生成可执行的jar文件

打uber-jar另一种方法

maven-shade-plugin也支持将依赖打包进JAR，这类似于maven-assembly-plugin。但是后者存在BUG，会导致Unable to locate Spring NamespaceHandler for XML schema na…

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15 years ago

Java

Hibernate基于XML的配置文件样例

Hibernate 3.0配置文件

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN"

"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

<session-factory name="cpdb">

<property name="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property>

<property name="hibernate.connection.password">CASTOR</property>

<property name="hibernate.connection.url">jdbc:oracle:thin:@RD-DB-5.sparknet.com.cn:1522:CPDB</property>

<property name="hibernate.connection.username">CASTOR</property>

<property name="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</property>

<property name="hibernate.current_session_context_class">thread</property>

</session-factory>

</hibernate-configuration>

XRM配置文件样例

XRM是Hibernate3里面的一个试验性功能，用于在数据库和XML文件之间进行映射

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<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >

<hibernate-mapping package="sparknet.traing.hxm.model">

<![CDATA[

Corporation basic information

]]>

</comment>

<composite-id name="id" node="-">

<key-property name="org" node="org" type="long">

<comment>database Code</comment>

</column>

</key-property>

<key-property name="id" node="id" type="long">

<comment>corporation identifier</comment>

</column>

</key-property>

<key-property name="seqId" node="seq-id" type="long">

<comment>changing sequence</comment>

</column>

</key-property>

<param name="property">corpOther</param>

</generator>

</composite-id>

<comment>corporation name</comment>

</column>

</property>

<comment>registered capital</comment>

</column>

</property>

<comment> corporation start date</comment>

</column>

</property>

<comment> corporation start time</comment>

</column>

</property>

<comment>address of street</comment>

</column>

</property>

<comment>building</comment>

</column>

</property>

</column>

</property>

</component>

<one-to-one name="corpOther" entity-name="AdvancedCorpInfo" node="corp-other-info" constrained="true" cascade="all" />

<many-to-one name="city" entity-name="City" embed-xml="true" node="city-code" cascade="all">

<comment>address of city</comment>

</column>

</many-to-one>

<many-to-one name="gongShangOrg" node="belong-dist-org" entity-name="GongShangOrg" cascade="all">

</many-to-one>

</key>

<list-index>

<comment>list index</comment>

</column>

</list-index>

<many-to-many unique="true" entity-name="Stock" node="stock" embed-xml="true">

</many-to-many>

</list>

<key>

</key>

<one-to-many entity-name="stock"/>

</set>

<comment>Version column</comment>

</column>

</property>

</class>

<composite-id name="id" node="identifier">

<key-property name="org" node="org" type="long">

<comment>database Code</comment>

</column>

</key-property>

<key-property name="id" node="id" type="long">

<comment>stock identifier</comment>

</column>

</key-property>

<key-property name="seqId" node="seq-id" type="long">

<comment>changing sequence</comment>

</column>

</key-property>

</composite-id>

<comment>stock's name</comment>

</column>

</property>

<comment>type of a stock</comment>

</column>

</property>

<comment>registered capital of a stock</comment>

</column>

</property>

<comment>actual capital of a stock</comment>

</column>

</property>

<comment>capi type of a stock</comment>

</column>

</property>

</key>

<many-to-one name="corp" embed-xml="false" entity-name="Corp" node="corp-ref">

</many-to-one>

</join>

</class>

<composite-id name="id" node="-">

<key-property name="org" node="org" type="long">

<comment>database Code</comment>

</column>

</key-property>

<key-property name="id" node="id" type="long">

<comment>gong shang org identifier</comment>

</column>

</key-property>

<key-property name="seqId" node="seq-id" type="long">

<comment>changing sequence</comment>

</column>

</key-property>

</composite-id>

</column>

</property>

</class>

<composite-id name="id" node="-">

<key-property name="org" node="org" type="long">

<comment>database Code</comment>

</column>

</key-property>

<key-property name="id" node="id" type="long">

<comment>corporation identifier</comment>

</column>

</key-property>

<key-property name="seqId" node="seq-id" type="long">

<comment>changing sequence</comment>

</column>

</key-property>

</composite-id>

</column>

</property>

<comment>city village flag</comment>

</column>

</property>

</class>

<![CDATA[

City dictionary

]]>

</comment>

<comment>city identifier</comment>

</column>

</generator>

</id>

</column>

</property>

</column>

</property>

</class>

</hibernate-mapping>

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15 years ago

Java

Maven知识集锦

基本概念

项目对象模型（Project Object Model,POM）：描述项目的基本信息：声明构件的坐标、如何进行构建、声明项目的依赖存放在项目根目录下的pom.xml中。POM包含了项目的一切元数据——具体IDE相关的元数据，例如.project、.clas…

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15 years ago

Java, Network

Java NIO浅析

什么是NIO

I/O是计算机与外部世界或者一个程序与计算机的其余部分的之间的接口，是操作系统的重要组成部分，I/O核心功能通常是操作系统内核的一部分。

NIO即“New I/O”（也有人将其解释为Non-blocking I/O），是JDK 1.4引入的新的输…

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15 years ago

Java

Axis知识集锦

Axis 动态WebService客户端样例

org.apache.axis.client.Service service = new Service();

Call call = (Call) service.createCall();

call.setTargetEndpointAddress( "http://192.168.1.184:9090/services/flowService" );

call.setOperationName( new QName( "http://flow.gmem.cc/", "request" ) );

call.addParameter( "userName", XMLType.XSD_STRING, ParameterMode.IN );

call.addParameter( "password", XMLType.XSD_STRING, ParameterMode.IN );

call.addParameter( "xml", XMLType.XSD_STRING, ParameterMode.IN );

call.setReturnType( XMLType.XSD_STRING );

Object result = call.invoke( new Object[] { "USER", "111111", xml } );

Axis1.4 客户端调用报错：Fault occurred while processing

报错信息： AxisFault faultCode: {http://schemas.xmlsoap.org/soap/envelope/}Server faultSubcode: faultString: Fault occurred w… 阅读全文

16 years ago

Category Java

Spring知识集锦

Dom4j知识集锦

Hibernate基于注解的配置样例

使用Eclipse进行远程调试

JProfiler学习笔记

Maven POM文件配置示例

Hibernate基于XML的配置文件样例

Maven知识集锦

Java NIO浅析

Axis知识集锦

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