SSH框架系列：Spring读取配置文件以及获取Spring注入的Bean

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

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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

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#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

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<!-- 引入datasource配置文件 -->

<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

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/*

* $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);

}

}

2.5我们可以通过如下方式，获得Spring注入的值

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Student stu = (Student)BeanUtils.getSpringBean("student");

2.6用JSONObject工具打印一下stu对象的值

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System.out.println(JSONObject.fromObject(stu).toString());

2.7运行结果为：

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{"course":"Java","id":"1012010638","name":"Haibo","remarks":"Come from Properties","score":90}

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