[英]Write into a properties file from a maven project
我想寫入屬性文件。 我也從屬性文件中讀取。 在此處查看Maven中屬性文件的路徑
public void setProperty(String coll, String bez) throws URISyntaxException {
File file =null;
Properties properties = getProperties();
URL url = Thread.currentThread().getContextClassLoader().getResource("/jsfatwork/messages/test.properties");
URL url2 = PageServiceBean.class.getResource("/jsfatwork/messages/test.properties");
try {
file = new File(url.toURI().getPath());
properties.setProperty(bez, coll);
System.out.println("Ich habe einen Wert gesetzt");
properties.store(new FileOutputStream(file), null);
System.out.println("Die Datei wurde gespeichert");
} catch (IOException ex) {
Logger.getLogger(PageServiceBean.class.getName()).log(Level.SEVERE, null, ex);
}
}
控制台輸出為:
Ich habe einen Wert gesetzt
Die Datei wurde gespeichert
因此,我認為它可行,但是在不到5秒鍾的時間內我得到了執行:
Warnung: Cannot serialize session attribute pageServiceBean for session 143CD5DE1C101E6A30515C585C32C02B
java.io.NotSerializableException: com.mongodb.DBApiLayer
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1183)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
at org.apache.catalina.session.StandardSession.writeObject(StandardSession.java:1671)
at org.apache.catalina.session.StandardSession.writeObjectData(StandardSession.java:1077)
at org.apache.catalina.session.StandardManager.doUnload(StandardManager.java:432)
at org.apache.catalina.session.StandardManager.unload(StandardManager.java:353)
at org.apache.catalina.session.StandardManager.stopInternal(StandardManager.java:518)
at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5622)
at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
at org.apache.catalina.core.StandardContext.reload(StandardContext.java:3947)
at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoader.java:426)
at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1345)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1530)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1540)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1540)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1519)
at java.lang.Thread.run(Thread.java:744)
...
Schwerwiegend: IOException while loading persisted sessions: java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: com.mongodb.DBApiLayer
java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: com.mongodb.DBApiLayer
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1354)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1990)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1915)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
at org.apache.catalina.session.StandardSession.readObject(StandardSession.java:1595)
at org.apache.catalina.session.StandardSession.readObjectData(StandardSession.java:1060)
at org.apache.catalina.session.StandardManager.doLoad(StandardManager.java:284)
at org.apache.catalina.session.StandardManager.load(StandardManager.java:204)
at org.apache.catalina.session.StandardManager.startInternal(StandardManager.java:491)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5443)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.StandardContext.reload(StandardContext.java:3954)
at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoader.java:426)
at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1345)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1530)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1540)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1540)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1519)
at java.lang.Thread.run(Thread.java:744)
Caused by: java.io.NotSerializableException: com.mongodb.DBApiLayer
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1183)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
at org.apache.catalina.session.StandardSession.writeObject(StandardSession.java:1671)
at org.apache.catalina.session.StandardSession.writeObjectData(StandardSession.java:1077)
at org.apache.catalina.session.StandardManager.doUnload(StandardManager.java:432)
at org.apache.catalina.session.StandardManager.unload(StandardManager.java:353)
at org.apache.catalina.session.StandardManager.stopInternal(StandardManager.java:518)
at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5622)
at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
at org.apache.catalina.core.StandardContext.reload(StandardContext.java:3947)
... 7 more
我將MongoDB用作數據庫。 但是在這種情況下,我寫入屬性文件,而不是數據庫。 所以我不知道為什么會收到java.io.NotSerializableException: com.mongodb.DBApiLayer
錯誤。
而且,一旦我在例外之后打開文件,文件中的屬性就不存在了。
任何想法?
我解決了這個問題。 我無法在類路徑中寫入屬性文件,因為在類路徑中,它是服務器上war文件的一部分。 在我寫完數據之后,數據不再一致了。 所以你得到了錯誤。 解決方案是將屬性文件放在類路徑之外。 我使用FileOutputStream
寫入屬性文件,並使用Eclipse HOME PATH
作為路徑。 這是一個好的解決方案,還是我應該使用其他方式在屬性文件中寫入?
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