how to get error code from exception in java

Caused by: java. lang. ClassNotFoundException: org. apache. poi. ss. formula. udf. UDFFinder, poiformula get Error Caused by: java. lang. ClassNotFoundException: org. apache. poi. ss. formula. udf. UDFFinder I receive this error because of version differences between poi (3

" +system.getproperty ("Java.compiler")); SYSTEM.OUT.PRINTLN ("Path to one or more extended directories: \ n" +system.getproperty ("Java.ext.dirs")); System.out.println ("Name of the operating system: \ n"+system.getproperty (" Os.name ")); SYSTEM.OUT.PRINTLN ("Architecture of the operating system: \ n" +system.getproperty ("Os.arch")); SYSTEM.OUT.PRINTLN ("OS version: \ n" +system.getproperty ("os.version")); System.out.println ("File delimiter (in UNIX system is"/"): \ n" +system.g

Because this time wasted too much time, so just record this mistake, for everyone to referenceCheck it out, the configuration is no problem, but on the Redis cluster machine can be, the error is as follows:Exception in thread ' main ' redis.clients.jedis.exceptions.JedisConnectionException:Could not get a resource from the poolReason:Because I was in the creation of the cluster when the IP address is: 127.0

=NewArrayList ();113 Values.add (value); the pairs.put (name, values); the } the }117}Catch(Exception e) {118 Throw Newjava.io.IOException (E.getmessage ());119 } - }121}After I introduced my Java project, I added the following packages:1 Import java.io.IOException; 2 Import java.util.ArrayList; 3 Import java.util.Enumeration; 4 Import java.util.Hashtable

construction method are used to indicate whether the details of the probing process are displayed, and false is not displayed. Codepagedetector.add (Jchardetfacade.getinstance ());//jchardetfacade encapsulates the jchardet provided by the Mozilla organization, which allows the encoding of most files to be measured. Therefore, generally with this detector can meet the requirements of most projects, if you are not at ease, you can add a few more detectors, such as the following asciidetector, Uni

(new namevaluepair[] {new Namevaluepair ("account", account), new Name Valuepair ("pswd", pswd), New Namevaluepair ("mobile", mobile), New Namevaluepair ("Needstatus ", String.valueof (Needstatus)), New Namevaluepair (" MSG ", msg), New Namevaluepair (" Extno ", E Xtno),}); int result = ClienT.executemethod (method); if (result = = HTTPSTATUS.SC_OK) {InputStream in = Method.getresponsebodyasstream (); Bytearrayoutputstream BAOs = new Bytearrayoutputstream ();

. OutputStream out = new Bufferedoutputstream (new FileOutputStream (New File ("D:/test.txt"));Out.write ("ABCD". GetBytes ());Out.flush ();Out.close (); use bufferedinputstream, bufferedoutputstream, BufferedReader, bufferedwriter to reduce the number of direct disk accesses .FileReader FR = new FileReader (f);BufferedReader br = new BufferedReader (FR);while (br.readline () = null) count++;5. Do not frequent new objects , use singleton mode for classes that only need to have one instance th

Principle: Java reflection is able to get the name of a property and then invoke a method of the class by invoking it.For example, there is a property called username, this class has written a method called GetUserName, Invoke call GetUserName this method. The code is as follows Copy Code

Java code get video length1 Packagetest;2 3 ImportJava.io.File;4 ImportJava.math.BigDecimal;5 6 ImportIt.sauronsoftware.jave.Encoder;7 ImportIt.sauronsoftware.jave.MultimediaInfo;8 9 Ten Public classReadvideo { One /** A * Length of time to read video - * @paramVideopath Video Path - * @return the */ - Public Staticstring Readvideo (

Java Get File size Today, when writing code to achieve the function of getting file size, there are two implementations, one is using the length () method of file, and the other is using the FileInputStream available () method, when InputStream does not perform a read operation , the size of the available () should be equal to the file size. However, when workin