Spring框架 资源文件的读取写入

路径写法

绝对路径
相对路径

txt文件 6-1_5

package com.luffy.code;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.StaticApplicationContext;
import org.springframework.core.io.Resource;

public class App {
	private static ApplicationContext app;
	public static void main(String[] args) {
		app = new StaticApplicationContext();
		Resource res = app.getResource("classpath:sample.txt"); // 相对路径
		if (res.exists()) {
			try {
				System.out.println("URI:" + res.getURI());
			} catch (IOException e) {
				e.printStackTrace();
			}
			System.out.println("*" + res.getFilename() + "* ==========");
			InputStream input = null;
			try {
				input = res.getInputStream();
				BufferedInputStream buf_input = new BufferedInputStream(input);
				byte[] bytes = new byte[10240];
				buf_input.read(bytes);
				String xml_str = new String(bytes).trim();
				System.out.println(xml_str);
			} catch (IOException e) {
				e.printStackTrace();
			}
			System.out.println("* end * ==========");
		} else {
			System.out.println("not found:" + res);
		}
	} 

}

properties文件 （通过xml配置） 6-6_11

• 主程序

package jp.tuyano.spring.sample2;

import java.util.Properties;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class App {

	private static ApplicationContext app;
	private static Properties mybeanProps;
	
	public static void main(String[] args) {
		app = new ClassPathXmlApplicationContext("classpath:/bean.xml");

		// 通过Id取bean对象
		MyBean bean = (MyBean) app.getBean("bean1");
		
		// 通过Id取properties文件	
		mybeanProps = (Properties)app.getBean("mybeanprops");

		// 读取
		String from = mybeanProps.getProperty("keeper.from");
		String to = mybeanProps.getProperty("keeper.to");
		MyBeanKeeper keeper = new MyBeanKeeper(bean, from, to);
		System.out.println(keeper);
	}

}

• properties路径在xml里配置
  class固定，

	
	
	
	
	
		
	
	
	
		
			classpath:bean.properties
		
	

根据BeanWrapper来取Bean的情报 6-12

PropertyDescriptor[] descriptors = wrapper.getPropertyDescriptors();

package jp.tuyano.spring.sample2;

import java.beans.PropertyDescriptor;

import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class App {

	private static ApplicationContext app;
	
	public static void main(String[] args) {
		app = new ClassPathXmlApplicationContext("classpath:/bean.xml");
		MyBean bean = (MyBean) app.getBean("bean1");
		
		bean.setMessage("Hello, How are you?");
		MyBeanKeeper keeper = new MyBeanKeeper(bean, "taro@yamada", "hanako@flower");
		BeanWrapper wrapper = new BeanWrapperImpl(keeper);
		
		// 取得所有的key value 的数组
		PropertyDescriptor[] descriptors = wrapper.getPropertyDescriptors();
		
		// 遍历
		for (PropertyDescriptor descriptor : descriptors) {
			String name = descriptor.getName();
			Object value =  wrapper.getPropertyValue(name);
			System.out.println(name + ":" + value);
		}
	}

}

打印信息
bean:MyBean [message=Hello, How are you?, date=Sun Apr 21 15:04:35 JST 2019]
class:class jp.tuyano.spring.sample2.MyBeanKeeper  // 每个bean都有这个信息
from:taro@yamada 
to:hanako@flower

直接在xml文件中设置对象属性 6-13

如果使用的type类型不是基本类型。则需要指定class

初始化：
 没有构造函数的时候，设置属性（调用set get)
 有构造函数的时候，设置构造函数的参数

假如是properties里是日期类型的属性 6-13

需要准备
CustomDateEditor 解析properties中数据，定义format
CustomEditorConfigurer 设置解析器为CustomDateEditor

自定义Editor

继承PropertyEditorSupport

package jp.tuyano.spring.sample2;

import java.text.SimpleDateFormat;
import java.util.Date;

import org.springframework.beans.PropertyEditorRegistrar;
import org.springframework.beans.PropertyEditorRegistry;
import org.springframework.beans.propertyeditors.CustomDateEditor;

public class CustomPropertyEditorRegistrar implements PropertyEditorRegistrar {
	// 	可以同时实现2种editor
	@Override
	public void registerCustomEditors(PropertyEditorRegistry registry) {
		registry.registerCustomEditor(Date.class, new CustomDateEditor(new SimpleDateFormat("yyyy-MM-dd"),true));
		registry.registerCustomEditor(MyBean.class, new MyBeanTypeEditor());
	}

}

获取properties


创建对象
	

配置对象
	
		
			
				
			
		
	
	
应用
	
		
		
	

---

eg的类

-MyBeanKeeper.java
package jp.tuyano.spring.sample2;

public class MyBeanKeeper {
	private MyBean bean;
	private String from;
	private String to;
	
	public MyBeanKeeper(MyBean mybean, String from, String to) {
		super();
		this.bean = mybean;
		this.from = from;
		this.to = to;
	}
	
	public MyBean getBean() {
		return bean;
	}
	public void setBean(MyBean bean) {
		this.bean = bean;
	}
	public String getFrom() {
		return from;
	}
	public void setFrom(String from) {
		this.from = from;
	}
	public String getTo() {
		return to;
	}
	public void setTo(String to) {
		this.to = to;
	}

	@Override
	public String toString() {
		return "MyBeanKeeper [bean=" + bean + ", from=" + from + ", to=" + to + "]";
	}
	
}

-MyBean.java
package jp.tuyano.spring.sample2;

import java.util.Calendar;
import java.util.Date;

public class MyBean {
	private String message;
	private Date date = Calendar.getInstance().getTime();

	public String getMessage() {
		return message;
	}

	public void setMessage(String message) {
		this.message = message;
	}

	public Date getDate() {
		return date;
	}

	public void setDate(Date date) {
		this.date = date;
	}

	@Override
	public String toString() {
		return "MyBean [message=" + message + ", date=" + date + "]";
	}
	
}