[英]Create config file at runtime in Java exported WAR
我已經用 Eclipse 制作了一個 web 項目來在 Tomcat v7 上運行我的 web 服務。 我有一個配置文件,它必須定義一些變量,這些變量應該在網絡服務器啟動時進行更改,而無需重新啟動它。 問題是:我可以把這個文件放在哪里? 目前我已將其放入“./”目錄,但似乎當我導出 WAR 文件並將其安裝在網絡服務器上時它不起作用。 有沒有辦法在 WAR 中創建這個文件並在運行時修改它?
這是訪問配置文件的 .class 文件的部分代碼
public class ToolConfigurations {
private static final Logger log = LogManager.getLogger(ToolConfigurations.class); //Oggetto logging
private static ToolConfigurations instance = null; //verificarne la necessità
private static String defaultServerName = null;
private static String defaultDbName = "postgres";
private static String defaultDbUser = "postgres";
private static String defaultDbPass = "password";
private static int defaultDbMaxConnNum = 10;
private static String configFilePath = ".\\";
private static String configFileName = "tool.properties";
private String serverName = null;
private String dbName = null;
private String dbUser = null;
private String d`enter code here`bPass = null;
private int dbMaxConnNum = -1;
private ToolConfigurations() throws Exception {
File file = new File(configFilePath + configFileName);
if(file.exists()) {
//file configurazione esiste
FileReader in = new FileReader(file);
BufferedReader br = new BufferedReader(in);
String line = null;
while((line = br.readLine()) != null) { //Leggo riga per riga il file
String[] values = line.split(" ");
switch (values[0]) {
case "serverName":
serverName = values[1];
break;
case "dbName":
dbName = values[1];
break;
case "dbUser":
dbUser = values[1];
break;
case "dbPass":
dbPass = values[1];
break;
case "dbMaxConnNum":
dbMaxConnNum = Integer.parseInt(values[1]);
break;
default:
log.warn("Elemento inaspettato nel file di configurazione: " + values[0]);
break;
}
}
br.close();
in.close();
}else {
if(file.createNewFile() == false) {
//Errore creazione file
log.error("Errore creazione file di configurazione");
throw new Exception("Errore creazione file configurazione");
}
//CREO FILE CONFIGURAZIONE CON IMPOSTAZIONI DI DEFAULT
FileWriter fw = new FileWriter(file);
fw.write("dbName " + defaultDbName + "\r\n");
fw.write("dbUser " + defaultDbUser + "\r\n");
fw.write("dbPass " + defaultDbPass + "\r\n");
fw.write("dbMaxConnNum " + defaultDbMaxConnNum + "\r\n");
fw.flush();
fw.close();
log.warn("File di configurazione non trovato. Path: " + file.getAbsolutePath() + ". Creato nuovo file con configurazioni di default.");
//CARICO IMPOSTAZIONI DI DEFAULT
dbName = defaultDbName;
dbUser = defaultDbUser;
dbPass = defaultDbPass;
dbMaxConnNum = defaultDbMaxConnNum;
}
}
public static synchronized ToolConfigurations getInstance() throws Exception {
if(instance == null) {
instance = new ToolConfigurations();
}
return instance;
}
...
在web服務器中,.class以外的文件由服務器直接負責。 您不需要重新加載服務器。
但是嘗試使用.properties文件並在部署在服務器上時檢查 WAR 的結構。
我找到的最佳解決方案是使用 ClassLoader 搜索我之前在主目錄中創建的配置文件。 使用示例如下:
ClassLoader classLoader = Thread.currentThread().getContextClassLoader(); InputStream fileInput = classLoader.getResourceAsStream(configFileName); if(fileInput == null){ //File not found }else{ //File found InputStreamReader sr = new InputStreamReader(fileInput); BufferedReader br = new BufferedReader(sr); try { while((line = br.readLine()) != null) { //Read file line by line } }catch (IOException e) { throw new IOException("Error parsing file: " + e.getMessage()); } }
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