[英]Write into a properties file from a maven project
我想写入属性文件。 我也从属性文件中读取。 在此处查看Maven中属性文件的路径
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);
}
}
控制台输出为:
Ich habe einen Wert gesetzt
Die Datei wurde gespeichert
因此,我认为它可行,但是在不到5秒钟的时间内我得到了执行:
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
我将MongoDB用作数据库。 但是在这种情况下,我写入属性文件,而不是数据库。 所以我不知道为什么会收到java.io.NotSerializableException: com.mongodb.DBApiLayer
错误。
而且,一旦我在例外之后打开文件,文件中的属性就不存在了。
任何想法?
我解决了这个问题。 我无法在类路径中写入属性文件,因为在类路径中,它是服务器上war文件的一部分。 在我写完数据之后,数据不再一致了。 所以你得到了错误。 解决方案是将属性文件放在类路径之外。 我使用FileOutputStream
写入属性文件,并使用Eclipse HOME PATH
作为路径。 这是一个好的解决方案,还是我应该使用其他方式在属性文件中写入?
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