GRASS and Java

2010-03-24T05:34:48Z

⚠️Apachemaven: /* Examples */

''ADD MORE PLEASE''

Define:
<source lang="java">
public String run(String[] cmd) {
...
Process p1=rt.exec(cmd, env);
</source>

and use:
<source lang="java">
gm.run({"r.info", "map=roads"});
</source>

==== Examples ====

It seems that calling grass in java by using java.Lang.Runtime.exec() can be implemented easily in Linux platform(Tests in Ubuntu 9.10 passed yet).

First install the grass use the apt-get:
sudo apt-get install grass //it will install the latest stable version
After the installation completed you can:
#Test it in the terminal without java(make sure that you have the GisDataBase installed,,):
open a terminal and enter:
grass or grass64 or grass63 -text, the following the instruction in the screen.

#Test using grass command directly in the terminal:
##set the environment // the grass is installed under /usr/lib/grass64.
<source lang="bash">
export GISBASE=/usr/lib/grass64
export GISRC=/home/kk/gisrc
export ldLibraryPath=$GISBASE/lib
export PATH=$PATH:$GISBASE/bin:$GISBASE/scripts
</source>

Then try the grass command directly, for example:
<source lang="bash">
g.version
g.gisenv
........
</source>

#Easily call grass in java if the test 2 passed.
Just use the Runtime.getRuntime.exec(String cmd,String[] env):
<source lang="java">
String cmd="g.version";
String[] exe = { "bash", "-c", cmd };
String[] env={"GISBASE=..","GISRC="".......}; the environment variables which you used in the
Process p=Runtime.getRuntime.exec(exe,env);
</source>
//FIXME for the format.
TODO

[[Category:Development]]
[[Category:Linking to other languages]]
[[Category:Java]]

GRASS and Java

2010-03-08T01:56:39Z

⚠️Apachemaven:

''ADD MORE PLEASE''

Define:
<source lang="java">
public String run(String[] cmd) {
...
Process p1=rt.exec(cmd, env);
</source>

and use:
<source lang="java">
gm.run({"r.info", "map=roads"});
</source>

==== Examples ====

It seems that calling grass in java by using java.Lang.Runtime.exec() can be implemented easily in Linux platform(Tests in Ubuntu 9.10 passed yet).

First install the grass use the apt-get:
sudo apt-get install grass //it will install the latest stable version
After the installation completed you can:
1)Test it in the terminal without java(make sure that you have the GisDataBase installed,,):
open a terminal and enter:
grass or grass64 or grass63 -text, the following the instruction in the screen.

2)Test using grass command directly in the terminal:
#set the environment // the grass is installed under /usr/lib/grass64.
export GISBASE=/usr/lib/grass64
export GISRC=/home/kk/gisrc
export ldLibraryPath=$GISBASE/lib
export PATH=$PATH:$GISBASE/bin:$GISBASE/scripts

Then try the grass command directly, for example:
g.version
g.gisenv
........

3)Easily call grass in java if the test 2 passed.
Just use the Runtime.getRuntime.exec(String cmd,String[] env):
String cmd="g.version";
String[] exe = { "bash", "-c", cmd };
String[] env={"GISBASE=..","GISRC="".......}; the environment variables which you used in the
Process p=Runtime.getRuntime.exec(exe,env);

//FIXME for the format.
TODO

[[Category:Development]]
[[Category:Linking to other languages]]
[[Category:Java]]

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GRASS and Java

GRASS and Java