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Java Forum / General / March 2008any LWP::UserAgent equivalent in java && a java regex question
Hi All I have found Perl's LWP::UserAgent and related packages useful. Does java have any thing equivalent i.e. that won't make me do encoding when I want to do an http POST? I am a newbie to java. Also, is there anything like java CPAN ? Also, in perl, if I do /some pattern (some other pattern)/ I get "some other pattern" in $1. I found out that () have different meanings in Java. The only to get $1 in Java is to write more lines. Thanks in advance Z. M. Wu > I have found Perl's LWP::UserAgent and related packages useful. Does > java have any thing > equivalent i.e. that won't make me do encoding when I want to do an > http POST? I am a newbie > to java. Also, is there anything like java CPAN ? I think Jakarta Commons HttpClient is what you want. > Also, in perl, if I do /some pattern (some other pattern)/ I get "some > other pattern" in $1. I found > out that () have different meanings in Java. The only to get $1 in > Java is to write more lines. Java regex support groups. The Java code to use regex is different than Perl, but that is to be expected. Arne > z.m...@att.net wrote: > > Java regex support groups. The Java code to use regex is different > than Perl, but that is to be expected. > > Arne Thanks. I have figured it out. Another question. Is there any java equivalent of Perl hash/db files? I want to store a few pieces of data on the disk. z.m.wu > Another question. Is there any java equivalent of Perl hash/db > files? I want > to store a few pieces of data on the disk. If you really want literal Berkeley DB, apparently there is a Java port of it (maintained by Oracle, the same people who now maintain the regular/original Berkeley DB): http://www.oracle.com/technology/products/berkeley-db/je/index.html I have never tried it out and don't know how mature it is, but it might be worth a look. More generally, I would say Berkeley DB is a good solution if your goal is to manipulate a subset of a large amount of data (and you don't want to or can't load it all into RAM), but it probably isn't the best solution for everything. There are other technologies out there for Java that assist you with loading and storing data. For example, you can serialize objects to/from XML. One of these technologies might allow you to store a more convenient data structure that the key/value pairs that Berkeley DB allows for. If you give more specifics about what you're trying to accomplish, maybe somebody can recommend one. - Logan >> Another question. Is there any java equivalent of Perl hash/db >> files? I want [quoted text clipped - 19 lines] > Berkeley DB allows for. If you give more specifics about what > you're trying to accomplish, maybe somebody can recommend one. The Derby database, a.k.a. the "Java DB", comes with Java 6 and above. PostgreSQL www.postgresql.org is an excellent choice, also. These are full, (mostly-)SQL-compliant DBMSes. The java.util.Properties class directly supports name-value pair serialization to either a simple "name=value" text file or to XML. HashMap (and other Map implementations) can be serialized using java.io.Serializable conventions or other mechanisms.  SignatureLew >> z.m...@att.net wrote: >> >> Java regex support groups. The Java code to use regex is different >> than Perl, but that is to be expected. > Another question. Is there any java equivalent of Perl hash/db > files? I want > to store a few pieces of data on the disk. In Java you would typical use a database through the standard JDBC interface. Arne >>> z.m...@att.net wrote: >>> [quoted text clipped - 7 lines] > In Java you would typical use a database through the standard > JDBC interface. This is not quite (or at least usually is not) equivalent functionality. With JDBC, you typically do not have control over where the data files are written, but with Berkeley DB, you do. (Of course, there are some relational databases where you can create a new instance easily and you do have control, but not in many cases.) Whether the original poster needs that is an unknown, though. - Logan >>>> z.m...@att.net wrote: >>>> Java regex support groups. The Java code to use regex is different [quoted text clipped - 15 lines] > > Whether the original poster needs that is an unknown, though. There are plenty of databases where you can specify location of files. All the embedded ones. The JDBC API is much different from BDB (at least that is my impression - I have not worked with BDB myself). But the tradition in the Java world is to use JDBC and not any special API's. It is usually a bad practice to try and move 1:1 from one language to another. Coding Java in Java and Perl in Perl is better than Java in Perl and Perl in Java. Arne > There are plenty of databases where you can specify location > of files. All the embedded ones. [quoted text clipped - 4 lines] > But the tradition in the Java world is to use JDBC and > not any special API's. Hi The program I am writing is a small desktop app which will be distributed to users who most likely won't have access to a sql server. My need is just a few key value pairs stored on disk to store the state of the program/data. A sql server seems an overkill for this purpose. Are you saying I can somehow use jdbc api to use some files on disk? Thanks z.m.wu >> There are plenty of databases where you can specify location >> of files. All the embedded ones. [quoted text clipped - 12 lines] > key value pairs stored on disk to store the state of > the program/data. A sql server seems an overkill for this purpose. ... Have you looked at java.util.Properties? Patricia >>> Is there any java equivalent of Perl hash/db files? I want to store >>> a few pieces of data on the disk. >> <answers involving JDBC, Derby etc> > The program I am writing is a small desktop app which will be > distributed to users who most likely won't have access to a sql [quoted text clipped - 3 lines] > > Are you saying I can somehow use jdbc api to use some files on disk? This is an example of an XY problem: http://www.perlmonks.org/index.pl?node_id=542341 http://en.wikipedia.org/wiki/XY_problem To store & retrieve application configuration settings see: http://java.sun.com/docs/books/tutorial/essential/environment/config.html http://java.sun.com/docs/books/tutorial/essential/environment/properties.html http://java.sun.com/javase/6/docs/technotes/guides/preferences/designfaq.html SignatureRGB On Mar 17, 6:09 am, RedGrittyBrick <RedGrittyBr...@SpamWeary.foo> wrote: > z.m...@att.net wrote: > [quoted text clipped - 15 lines] > -- > RGB Ok. It seems that properties and preferences are almost what I need. Thanks for the replies. z.m.wu >> There are plenty of databases where you can specify location >> of files. All the embedded ones. [quoted text clipped - 13 lines] > Are you saying I can somehow use jdbc api to use some files > on disk? I believe that for what what you in other languages may use BDB/ISAM files for you would use a database (very likely embedded so that there are no server process) and JDBC in Java. You can use flat files. Properties files, XML files etc.. XML serializing/deserializing could be an option for you. Arne In article <629c1cd3-5eb7-44ab-8ee5-128155b1f9ec@s50g2000hsb.googlegroups.com>, > Another question. Is there any java equivalent of Perl hash/db > files? I want > to store a few pieces of data on the disk. Google for SQLite. There are Java interfaces available for it. Signature--Tim Smith Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. 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