Spring框架对数据持久化的支持与实现

O/R Mapping技术有效地解决了数据持久化问题.Spring框架支持ORM技术,它的SpringDAO和Spring ORM功能提供了对Hibernate框架的深入支持.通过XML配置文件描述Bean对象及其依赖关系,Spring利用IoC容器实现了Bean的装配与控制;同时通过建立POJO映射形成了ORM的体系结构.掌握基于Bean容器的开发模式,使控制层、逻辑层及数据层实现充分解耦,是Spring开发工作的核心.     

基于JdbcTemplate的数据库访问处理

pringJdbcTemplate简化了对数据库的访问处理,详细讨论了JdbcTemplate实现对数据库表格的增、删、改、查询的操作处理方法。分别针对多行数据结果集、单值结果的查询需求,给出相应的JdbcTemplate的不同方法调用。在数据更新处理中,讨论了完整SQL和带参数填充的SQL的方法调用形式。最后,结合文件内容的保存与恢复处理实例,介绍了大容量数据的读写,通过LobCreator对象的setBlobAsBinaryStream方法实现LOB数据的写入,通过LobHandler接口提供的系列方法可获取LOB数据。     

Multiaxial fatigue and failure analysis of helical compression springs

Multiaxial fatigue criteria are applied to the analysis of helical compression springs. The critical plane approaches, Fatemi–Socie and Wang–Brown, and the Coffin–Manson method based on shear deformation, were used to predict fatigue lives of the springs under constant amplitude loading. Experimental fatigue lives are compared with the multiaxial fatigue criteria predictions. The stress analysis was carried out in the finite element code ANSYS, and the multiaxial fatigue study was performed using the fatigue software nCode. A failure analysis was conducted in order to determine the fatigue crack initiation point and a comparison of that location with the most damaged zone predicted by the numerical analysis is made. The Fatemi–Socie critical plane approach gives a good prediction of fatigue life. While the Wang–Brown criterion overestimates spring fatigue life, the Coffin–Mason model gives conservative results.     

Light composite elliptic springs for vehicle suspension

For composites to compete in vehicle suspension applications, it is essential to control their failure by utilising their strength in principal direction instead of shear. This can be achieved efficiently by employing a new configuration instead of existing one. This study marries between an elliptical configuration and the woven roving composites.

In this paper, the influence of ellipticity ratio on performance of woven roving wrapped composite elliptical springs has been investigated both experimentally and numerically. A series of experiments was conducted for composite elliptical springs with ellipticity ratios (a/b) ranging from one to two. Typical failure histories of their failure mechanism are presented and discussed. In general, this study demonstrated that composites elliptical spring can be used for light and heavy trucks and meet the requirements, together with substantial weight saving. The results showed that the ellipticity ratio significantly influenced the spring rate and failure loads. Composite elliptic spring with ellipticity ratios of a/b 2.0 displayed the highest spring rate.     

基于Struts+Spring+Hibernate架构的能源管理系统的研究

能源管理系统在企业中占据着极其重要的地位，选择良好的体系结构对于能源管理系统的开发、维护和扩展具有重要的意义。因此本文提出了基于轻量级Web框架——Sturts＋Spring＋Hibernate的系统结构，分别阐述了三种框架技术。并将三种框架技术整合起来应用到系统中，从而提高了项目代码的可重用性和开发效率，并易于维护。     

基于SNMP协议的流量监测系统的设计与实现

网络流量监测是网络性能分析和网络规划设计的基础。随着网络技术的飞速发展,如何管理网络中的各种不同设备变得尤其重要。本文介绍了一种流量监测系统,它不仅能监测设备和网络的运行状况,提供告警信息和报表分析,还能向数据业务用户提供用户关心的流量数据,该系统是上海电信的核心网管系统,使用Java语言实现。     

Web应用分层与开发框架设计研究

对Web应用进行了合理的分层，介绍了3种主流开源框架Struts、Spring和Hibernate，应用它们作为Web应用各层的相应实现，进行了有效整合，设计了一个优秀的、完整的开发框架，给出了该框架在实践中的成功应用。     

一种轻量级的J2EE解决方案及其应用

在J2EE项目的开发过程中,开发人员多采用传统的方法,即采用EJB这种重量级的组件模型。然而在很多情况下,EJB并不是最佳的解决方案。本文提出一种轻量级的J2EE解决方案,即采用开源框架Spring、Struts和Hibernate的组合来开发企业级J2EE应用,并结合一个成功案例详细说明如何开发轻量级的J2EE企业级应用。     

60 t Consteel电弧炉-60 t LF(VD)冶炼60Si2CrVAT弹簧钢的工艺实践

西宁特钢采用60 t Consteel电弧炉-60 t LF(VD)-700 kg铸锭工艺生产60Si2CrVAT弹簧钢(%)0.56～0.64C,1.40～1.80Si,0.90～1.20Cr,0.10～0.19V,≤0.020P,≤0.020S.Consteel电弧炉偏心底出钢留渣作业,熔炼温度控制在1 560～1 590 ℃,冶炼全过程泡沫渣长弧操作,可使电弧炉出钢时钢水中磷含量≤0.015%,LF精炼时加铝脱氧,氩气搅拌,控制钢中全铝含量为0.025%～0.050%,并经VD处理使钢中氧含量达(9～12)×10-6,氢含量为(0.6～0.9)×10-6.检验结果表明,钢中A细类夹杂≤1.0级,B细类夹杂为0.5级,其余为0级.     

Low-velocity impact analysis of composite laminates using linearized contact law

Usually many researchers have used the modified Hertzian contact law or experimental static indentation law to analyze impact response of composite laminates subjected to low-velocity impact. In this study, physical meaning of the analytical method using the laws was investigated and the difference between the analytical results obtained using the two laws was also investigated. Furthermore parametric study on contact coefficient and exponent of the contact law was performed. Finally it could be shown that linearized contact law could be well applied to the low-velocity impact analysis of composite laminates. If this concept is used, any general-purpose finite element method software can be used to solve impact problem without direct developing any FEM code by each researcher. In this paper, some analytical results analyzed using a general-purpose commercial FEM software were also presented.