Run-Java脚本SH

　　经常在Linux或Windows下运行Java xxx等脚本命令，比如xx.sh，这个批命令中要对Java的路径和Classpath进行设置，硬编码不利于重用，下面是这个通用的批命令

#!/usr/bin/env bash
#
# Copyright 2012 Zemian Deng
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# A wrapper script that run any Java application in unix/cygwin bash env.
#
# This script is assumed to be located in an application's "bin" directory. It will
# auto resolve its directory location relative to the application path (which is one
# parent up from the script.) Therefore, this script can be run any where in the file
# system and it will still reference the same application directory.
#
# This script will by default auto setup a Java classpath that picks up any "config"
# and "lib" directories under the application directory. It also will also add a
# any typical Maven project output directories such as "target/test-classes",
# "target/classes", and "target/dependency" into classpath. This can be disable by
# setting RUN_JAVA_NO_AUTOCP=1.
#
# If the "Default parameters" section bellow doesn't match to user's env, then user
# may override these variables in their terminal session or preset them in shell's
# profile startup script. The values of all path should be in cygwin/unix path,
# and this script will auto convert them into Windows path where is needed.
#
# User may customize the Java classpath by setting RUN_JAVA_CP, which will prefix to existing
# classpath, or use the "-cp" option, which will postfix to existing classpath.
#
# Usage:
#   run-java [java_opts] <java_main_class> [-cp /more/classpath] [-Dsysprop=value]
#
# Example:
#   run-java example.Hello
#   run-java example.Hello -Dname=World
#   run-java org.junit.runner.JUnitCore example.HelloTest -cp "$HOME/apps/junit/lib/*"
#
# Created by: Zemian Deng 03/09/2012

# This run script dir (resolve to absolute path)
SCRIPT_DIR=$(cd $(dirname $0) && pwd)    # This dir is where this script live.
APP_DIR=$(cd $SCRIPT_DIR/.. && pwd)      # Assume the application dir is one level up from script dir.

# Default parameters
JAVA_HOME=${JAVA_HOME:=$HOME/apps/jdk}     # This is the home directory of Java development kit.
RUN_JAVA_CP=${RUN_JAVA_CP:=$CLASSPATH}     # A classpath prefix before -classpath option, default to $CLASSPATH
RUN_JAVA_OPTS=${RUN_JAVA_OPTS:=}           # Java options (-Xmx512m -XX:MaxPermSize=128m etc)
RUN_JAVA_DEBUG=${RUN_JAVA_DEBUG:=}         # If not empty, print the full java command line before executing it.
RUN_JAVA_NO_PARSE=${RUN_JAVA_NO_PARSE:=}   # If not empty, skip the auto parsing of -D and -cp options from script arguments.
RUN_JAVA_NO_AUTOCP=${RUN_JAVA_NO_AUTOCP:=} # If not empty, do not auto setup Java classpath
RUN_JAVA_DRY=${RUN_JAVA_DRY:=}             # If not empty, do not exec Java command, but just print

# OS specific support.  $var _must_ be set to either true or false.
CYGWIN=false;
case "`uname`" in
  CYGWIN*) CYGWIN=true ;;
esac

# Define where is the java executable is
JAVA_CMD=java
if [ -d "$JAVA_HOME" ]; then
       JAVA_CMD="$JAVA_HOME/bin/java"
fi

# Auto setup applciation's Java Classpath (only if they exists)
if [ -z "$RUN_JAVA_NO_AUTOCP" ]; then
       if [ -d "$APP_DIR/config" ]; then RUN_JAVA_CP="$RUN_JAVA_CP:$APP_DIR/config" ; fi
       if [ -d "$APP_DIR/target/test-classes" ]; then RUN_JAVA_CP="$RUN_JAVA_CP:$APP_DIR/target/test-classes" ; fi
       if [ -d "$APP_DIR/target/classes" ]; then RUN_JAVA_CP="$RUN_JAVA_CP:$APP_DIR/target/classes" ; fi
       if [ -d "$APP_DIR/target/dependency" ]; then RUN_JAVA_CP="$RUN_JAVA_CP:$APP_DIR/target/dependency/*" ; fi
       if [ -d "$APP_DIR/lib" ]; then RUN_JAVA_CP="$RUN_JAVA_CP:$APP_DIR/lib/*" ; fi
fi

ARGS="$@"
# Parse addition "-cp" and "-D" after the Java main class from script arguments
#   This is done for convenient sake so users do not have to export RUN_JAVA_CP and RUN_JAVA_OPTS
#   saparately, but now they can pass into end of this run-java script instead.
#   This can be disable by setting RUN_JAVA_NO_PARSE=1.
if [ -z "$RUN_JAVA_NO_PARSE" ]; then
       # Prepare variables for parsing
       FOUND_CP=
       NEW_ARGS[0]=''
       IDX=0

       # Parse all arguments and look for "-cp" and "-D"
       for ARG in "$@"; do
              if [[ -n $FOUND_CP ]]; then
                     RUN_JAVA_CP="$RUN_JAVA_CP:$ARG"
                     FOUND_CP=
              else
                     case $ARG in
                     '-cp')
                            FOUND_CP=1
                            ;;
                     '-D'*)
                            RUN_JAVA_OPTS="$RUN_JAVA_OPTS $ARG"
                            ;;
                     *)
                            NEW_ARGS[$IDX]="$ARG"
                            let IDX=$IDX+1
                            ;;
                     esac
              fi
       done
       ARGS="${NEW_ARGS[@]}"
fi

# Convert Windows Java Classpath
if $CYGWIN; then
       RUN_JAVA_CP=$(cygpath -mp $RUN_JAVA_CP)
fi

# Display full Java command.
if [ -n "$RUN_JAVA_DEBUG" ] || [ -n "$RUN_JAVA_DRY" ]; then
       echo "$JAVA_CMD" $RUN_JAVA_OPTS -cp "$RUN_JAVA_CP" $ARGS
fi

# Run Java Main class
if [ -z "$RUN_JAVA_DRY" ]; then
       "$JAVA_CMD" $RUN_JAVA_OPTS -cp "$RUN_JAVA_CP" $ARGS
fi