SSH框架系列：Spring读取配置文件以及获取Spring注入的Bean

时间：2014-12-17 22:16:10 阅读：178 评论：0 收藏：0 [点我收藏+]

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分类：【java】2013-12-09 16:29 1020人阅读评论(0) 收藏举报

1.简介

在SSH框架下，假设我们将配置文件放在项目的src/datasource.properties路径下，Spring的配置文件也是src/applicationContext.xml路径下，那么我们可以借助Spring的property-placeholder读取配置文件，然后注入Bean中。我们在程序中，可以根据Bean的Id，获取注入的值。这样我们就可以借助Spring来读取配置文件。

2.Code

2.1Student.java

[java] view plain copy

package edu.njupt.zhb.model.mysql;
/**
* Student entity. @author MyEclipse Persistence Tools
*/
public class Student implements java.io.Serializable {
// Fields
private String id;
private String name;
private String course;
private Integer score;
private String remarks;
// Constructors
/** default constructor */
public Student() {
}
/** minimal constructor */
public Student(String name, String course, Integer score) {
this.name = name;
this.course = course;
this.score = score;
}
/** full constructor */
public Student(String name, String course, Integer score, String remarks) {
this.name = name;
this.course = course;
this.score = score;
this.remarks = remarks;
}
// Property accessors
public String getId() {
return this.id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
public String getCourse() {
return this.course;
}
public void setCourse(String course) {
this.course = course;
}
public Integer getScore() {
return this.score;
}
public void setScore(Integer score) {
this.score = score;
}
public String getRemarks() {
return this.remarks;
}
public void setRemarks(String remarks) {
this.remarks = remarks;
}
}

2.2datasource.properties中的配置

[plain] view plain copy

#student config
student.name=Haibo
student.id=1012010638
student.course=Java
student.score=90
student.remarks=Come from Properties

2.3Spring配置文件applicationContext.xml部分配置

[html] view plain copy

<context:property-placeholder location="classpath:datasource.properties" />
<bean id="student" class="edu.njupt.zhb.model.mysql.Student">
<property name="id" value="${student.id}" />
<property name="name" value="${student.name}" />
<property name="course" value="${student.course}" />
<property name="score" value="${student.score}" />
<property name="remarks" value="${student.remarks}" />
</bean>

2.4读取Spring中的Bean函数

[java] view plain copy

/*
* $filename: BeanUtils.java,v $
* $Date: 2013-12-9 $
* Copyright (C) ZhengHaibo, Inc. All rights reserved.
* This software is Made by Zhenghaibo.
*/
package edu.njupt.zhb.tools;
import org.apache.struts2.ServletActionContext;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;
/*
*@author: ZhengHaibo
*web: http://blog.csdn.net/nuptboyzhb
*mail: zhb931706659@126.com
*2013-12-9 Nanjing,njupt,China
*/
public class BeanUtils {
/**
* 获取Spring中注入的Bean
* @param beanId：id
* @return
*/
public static Object getSpringBean(String beanId){
//Spring配置文件的路径
String xmlRealPath = ServletActionContext.getServletContext().getRealPath("/WEB-INF/classes/applicationContext.xml");
ApplicationContext ac = new FileSystemXmlApplicationContext(xmlRealPath);
return ac.getBean(beanId);
}
}