spring El

package com.wisely.heighlight_spring4.ch2.el; import java.io.IOException; import org.apache.commons.io.IOUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;
import org.springframework.core.env.Environment;
import org.springframework.core.io.Resource; @Configuration
@ComponentScan("com.wisely.heighlight_spring4.ch2.el")
@PropertySource("classpath:com/wisely/heighlight_spring4/ch2/el/test.properties") //加载属性资源文件
public class ElConfig {
@Value("I love you!") //普通的字符串
private String normal; @Value("#{systemProperties['os.name']}") //系统属性
private String osName; @Value("#{ T(java.lang.Math).random() * 100.0 }") //表达式结果
private double randomNumber; @Value("#{demoService.another}") //其他Bean属性
private String fromAnother; @Value("classpath:com/wisely/heighlight_spring4/ch2/el/test.txt") //文件资源
private Resource testFile; @Value("http://www.baidu.com") //网址资源
private Resource testUrl; @Value("${book.name}") //配置文件
private String bookName; @Autowired
private Environment environment; @Bean
public static PropertySourcesPlaceholderConfigurer propertyConfigure() {
return new PropertySourcesPlaceholderConfigurer();
} public void outputResource() {
try {
System.out.println("normal:"+normal);
System.out.println("osName:"+osName);
System.out.println("randomNumber:"+randomNumber);
System.out.println("fromAnother:"+fromAnother); System.out.println("testFile:"+IOUtils.toString(testFile.getInputStream()));
System.out.println("testUrl:"+IOUtils.toString(testUrl.getInputStream()));
System.out.println("bookName:"+bookName);
System.out.println("environment:"+environment.getProperty("book.author"));
} catch (IOException e) {
e.printStackTrace();
}
}
}

package com.wisely.heighlight_spring4.ch2.el; import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service; @Service
public class DemoService {
@Value("其它类的属性")
private String another; //注入普通的字符串 public String getAnother() {
return another;
} public void setAnother(String another) {
this.another = another;
} }