线程安全的java日志记录器
1 import java.io.BufferedWriter;
2 import java.io.File;
3 import java.io.FileWriter;
4 import java.io.IOException;
5 import java.text.SimpleDateFormat;
6 import java.util.Date;
7 import java.util.concurrent.atomic.AtomicReference;
8
9
10
11 /**
12 *
13 * @author zhangshuang
14 *
15 */
16 public class SyncFile {
17 private static String FILENAME ="";
18
19 private static String FILEDIR="";
20
21 private static final AtomicReference<SyncFile> instance = new AtomicReference<SyncFile>();
22
23 private String currentDate = SyncFile.getCurrentDate();
24
25 private File file = null;
26
27 private FileWriter fw = null;
28
29 private BufferedWriter bw = null;
30
31 private SyncFile(String dir, String name) {
32 SyncFile.FILEDIR = dir;
33 SyncFile.FILENAME = name ;
34 while(dir.endsWith("/")) {
35 dir = dir.substring(0, dir.length() - 1);
36 }
37 mkDir(dir);
38 String filePath = dir + "/" + name + "." + currentDate ;
39 file = new File(filePath);
40 try {
41 if(!file . exists()) {
42 file.createNewFile();
43 }
44 fw = new FileWriter(file, true);
45 bw = new BufferedWriter(fw);
46 } catch (Exception e) {
47 e.printStackTrace();
48 }
49
50 }
51
52 public static SyncFile getInstance(String dir, String name) {
53 if( instance .get() == null ) {
54 instance .compareAndSet(null, new SyncFile(dir, name));
55 }
56 return instance.get();
57 }
58
59 public static SyncFile getInstance() {
60 if( instance .get() == null ) {
61 instance.compareAndSet(null, new SyncFile(FILEDIR, FILENAME));
62 }
63 return instance.get();
64 }
65
66 public synchronized void write (String line) {
67 openBuffer() ;
68
69 line = line.endsWith("\n") ? line : line + "\n";
70 try {
71 if(line != null && line.trim() != ""){
72 bw.write(line);
73 bw.flush();
74 }
75 } catch (IOException e) {
76 e.printStackTrace();
77 }
78 }
79
80 private static void mkDir( String dir) {
81 File file = new File(dir);
82 mkDir(file);
83 }
84
85 /**
86 * <p>递归创建不存在的目录
87 * @param file
88 */
89 private static void mkDir(File file){
90 if(file.getParentFile().exists()){
91 file.mkdir();
92 }else{
93 mkDir(file.getParentFile());
94 file.mkdir();
95 }
96 }
97
98 public static String getCurrentDate() {
99 return new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss").format(new Date());
100 }
101
102 private void openBuffer() {
103
104 if(!currentDate.equals(SyncFile.getCurrentDate()) || fw == null ||bw == null) {
105 if (!currentDate.equals(SyncFile.getCurrentDate())){
106 currentDate = SyncFile.getCurrentDate();
107 file = new File(FILEDIR + "/" + FILENAME + "." + currentDate);
108 }
109 close ();
110 try {
111 fw = new FileWriter(file , true);
112 bw = new BufferedWriter(fw);
113 } catch (IOException e) {
114 e.printStackTrace();
115 }
116 }
117
118 }
119
120 public void close() {
121 try {
122 if (bw != null) {
123 bw.close();
124 bw = null;
125 }
126
127 if (fw != null) {
128 fw.close();
129 fw = null;
130 }
131 } catch (IOException e) {
132 e.printStackTrace();
133 }
134 }
135
136 public static void main(String[] args) {
137 // String a = "/data/logs/////";
138 // while (a.endsWith("/")) {
139 // a = a.substring(0 , a.length()-1);
140 // System.out.println(a);
141 // }
142 // System.out.println("ok" + a);
143 mkDir("c:/2");
144 }
145
146
147 }
通用的日志记录器（java）,码迷,mamicode.com
时间： 2024-08-06 03:19:15