从maven项目写入属性文件

Question

我想写一个属性文件。 我也从属性文件中读取。看这里Path for a properties file in maven

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);            
    }
}

控制台输出是：

Ich habe einen Wert gesetzt
Die Datei wurde gespeichert

所以我认为它有效，但在＆lt; 5秒我得到了一个execption：

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

我使用MongoDB作为数据库。但在这种情况下，我写入属性文件而不是数据库。所以我不知道为什么会出现java.io.NotSerializableException: com.mongodb.DBApiLayer错误。

一旦我在异常后打开文件，文件中的属性就不存在了。

有什么想法吗？

Answer 1

我解决了这个问题。 我无法写入类路径中的属性文件，因为在类路径中它是服​​务器上war文件的一部分。在我写完数据后不再一致。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写入我的属性文件并使用eclipse HOME PATH作为路径。 这是一个很好的解决方案，还是应该使用不同的方式写入属性文件？