Velocity 控制台日志输出

boy11-2

1. import org.apache.velocity.runtime.RuntimeServices;
   
2. import org.apache.velocity.runtime.log.LogSystem;
   
3. 
   
4. public class ConsoleLogSystem implements LogSystem {
   
5. 
   
6.   private RuntimeServices rs;
   
7. 
   
8.   private int maxLevel = LogSystem.INFO_ID;
   
9. 
   
10.   private static final String[] LEVEL_NAMES = new String[] { "ERROR", "WARN",
    
11.       "INFO", "DEBUG" };
    
12. 
    
13.   private static final int[] LEVELS = new int[] { LogSystem.ERROR_ID,
    
14.       LogSystem.WARN_ID, LogSystem.INFO_ID, LogSystem.DEBUG_ID };
    
15. 
    
16.   public void init(RuntimeServices rs) throws Exception {
    
17.     System.out.println("ConsoleLogSystem.init() called");
    
18.     this.rs = rs;
    
19.     configure();
    
20.   }
    
21. 
    
22.   public void logVelocityMessage(int level, String message) {
    
23.     if (level >= maxLevel) {
    
24.       System.out.println("[" + getLevelName(level) + "] " + message);
    
25.     }
    
26.   }
    
27. 
    
28.   private void configure() {
    
29.     String maxLevelName = rs.getString("console.logsystem.max.level");
    
30. 
    
31.     int level = getLevelFromString(maxLevelName);
    
32. 
    
33.     if (level > -1) {
    
34.       System.out.println("Using log level: " + maxLevelName);
    
35.       maxLevel = level;
    
36.     }
    
37.   }
    
38. 
    
39.   private int getLevelFromString(String levelName) {
    
40.     for (int x = 0; x < LEVEL_NAMES.length; x++) {
    
41.       if (LEVEL_NAMES[x].equals(levelName)) {
    
42.         return LEVELS[x];
    
43.       }
    
44.     }
    
45.     // should not arrive here, couldn't find the level
    
46.     return -1;
    
47.   }
    
48. 
    
49.   private String getLevelName(int level) {
    
50.     for (int x = 0; x < LEVELS.length; x++) {
    
51.       if (LEVELS[x] == level) {
    
52.         return LEVEL_NAMES[x];
    
53.       }
    
54.     }
    
55.     return "UNKNOWN";
    
56.   }
    
57. }

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