JAVA 获取系统环境变量

分享代码：

 1 package com.base.entity;
 2 
 3 import java.io.Serializable;
 4 import java.util.Comparator;
 5 
 6 /**
 7  * 系统环境变量
 8  * 
 9  * @author test
10  * @create 2014-3-10下午04:35:47
11  * @version 1.0
12  */
13 public class SystemProperty implements Serializable, Comparator {
14 
15     private static final long serialVersionUID = 1L;
16 
17     // 属性key
18     private String iKey;
19 
20     // 属性Value
21     private String iVal;
22 
23     public SystemProperty() {
24         // TODO Auto-generated constructor stub
25     }
26 
27     public SystemProperty(String iKey, String iVal) {
28         super();
29         this.iKey = iKey;
30         this.iVal = iVal;
31     }
32 
33     @Override
34     public int compare(Object o1, Object o2) {
35         // TODO Auto-generated method stub
36 
37         SystemProperty s1 = (SystemProperty) o1;
38         SystemProperty s2 = (SystemProperty) o2;
39 
40         return s1.getiKey().compareTo(s2.getiKey());
41     }
42 
43     public String getiKey() {
44         return iKey;
45     }
46 
47     public void setiKey(String iKey) {
48         this.iKey = iKey;
49     }
50 
51     public String getiVal() {
52         return iVal;
53     }
54 
55     public void setiVal(String iVal) {
56         this.iVal = iVal;
57     }
58 }

 1 package com.util.common;
 2 
 3 import java.util.ArrayList;
 4 import java.util.Collections;
 5 import java.util.Iterator;
 6 import java.util.List;
 7 import java.util.Map;
 8 
 9 import com.base.entity.SystemProperty;
10 
11 /**
12  * @author test
13  * @create 2014-3-10下午04:39:08
14  * @version 1.0
15  */
16 public final class Read {
17 
18     /**
19      * 获取系统所有环境变量
20      * 
21      * @return List<SystemProperty>
22      * @throws Exception
23      */
24     public static List<SystemProperty> readSysPropertyAll() throws Exception {
25         return readSysProperty("BOCO_ALL");
26     }
27 
28     /**
29      * 获取系统指定环境变量
30      * 
31      * @param key
32      *            环境变量Key
33      * @return List<SystemProperty>
34      * @throws Exception
35      */
36     public static List<SystemProperty> readSysProperty(String key)
37             throws Exception {
38 
39         List<SystemProperty> list = new ArrayList<SystemProperty>();
40 
41         Map m = System.getenv();
42         String keys = "";
43         if (key.equals("BOCO_ALL")) {
44             for (Iterator<String> iter = m.keySet().iterator(); iter.hasNext();) {
45                 keys = iter.next();
46                 list.add(new SystemProperty(keys, m.get(keys).toString()));
47                 Collections.sort(list, new SystemProperty());
48             }
49         } else {
50             if (m.containsKey(key)) {
51                 list.add(new SystemProperty(key, m.get(key).toString()));
52             } else {
53                 throw new Exception("系统中未包含指定Key：" + key);
54             }
55         }
56         return list;
57     }
58 }