1 package com.wisely.heighlight_spring4.ch2.el;
2
3 import java.io.IOException;
4
5 import org.apache.commons.io.IOUtils;
6 import org.springframework.beans.factory.annotation.Autowired;
7 import org.springframework.beans.factory.annotation.Value;
8 import org.springframework.context.annotation.Bean;
9 import org.springframework.context.annotation.ComponentScan;
10 import org.springframework.context.annotation.Configuration;
11 import org.springframework.context.annotation.PropertySource;
12 import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;
13 import org.springframework.core.env.Environment;
14 import org.springframework.core.io.Resource;
15
16 @Configuration
17 @ComponentScan("com.wisely.heighlight_spring4.ch2.el")
18 @PropertySource("classpath:com/wisely/heighlight_spring4/ch2/el/test.properties") //加载属性资源文件
19 public class ElConfig {
20 @Value("I love you!") //普通的字符串
21 private String normal;
22
23 @Value("#{systemProperties['os.name']}") //系统属性
24 private String osName;
25
26 @Value("#{ T(java.lang.Math).random() * 100.0 }") //表达式结果
27 private double randomNumber;
28
29 @Value("#{demoService.another}") //其他Bean属性
30 private String fromAnother;
31
32 @Value("classpath:com/wisely/heighlight_spring4/ch2/el/test.txt") //文件资源
33 private Resource testFile;
34
35 @Value("http://www.baidu.com") //网址资源
36 private Resource testUrl;
37
38 @Value("${book.name}") //配置文件
39 private String bookName;
40
41 @Autowired
42 private Environment environment;
43
44 @Bean
45 public static PropertySourcesPlaceholderConfigurer propertyConfigure() {
46 return new PropertySourcesPlaceholderConfigurer();
47 }
48
49 public void outputResource() {
50 try {
51 System.out.println("normal:"+normal);
52 System.out.println("osName:"+osName);
53 System.out.println("randomNumber:"+randomNumber);
54 System.out.println("fromAnother:"+fromAnother);
55
56 System.out.println("testFile:"+IOUtils.toString(testFile.getInputStream()));
57 System.out.println("testUrl:"+IOUtils.toString(testUrl.getInputStream()));
58 System.out.println("bookName:"+bookName);
59 System.out.println("environment:"+environment.getProperty("book.author"));
60 } catch (IOException e) {
61 e.printStackTrace();
62 }
63 }
64 }
1 package com.wisely.heighlight_spring4.ch2.el;
2
3 import org.springframework.beans.factory.annotation.Value;
4 import org.springframework.stereotype.Service;
5
6 @Service
7 public class DemoService {
8 @Value("其它类的属性")
9 private String another; //注入普通的字符串
10
11 public String getAnother() {
12 return another;
13 }
14
15 public void setAnother(String another) {
16 this.another = another;
17 }
18
19 }
