我在尝试从Java运行 sh 脚本时遇到问题。我已经试过了 similar problems at stack overflow的解决方案。
问题不在于脚本本身的调用,而是命令 pg_dump :
=>如果我从控制台./my_script.sh
运行以下脚本,一切正常:
NOW="$(date +%Y%m%d_%H%M%S)"
BACKUP_FILE="backup_${NOW}.sql"
FOLDER="./backups"
if [ ! -d "$FOLDER" ]; then
mkdir $FOLDER
fi
OUTPUT=${FOLDER}/${BACKUP_FILE}
HOST="my.host.dir"
PORT="8080"
DB_NAME="dbName"
USER="user"
PASS="pass"
OPT="-h ${HOST} -p ${PORT} -U ${USER} -f ${OUTPUT} -c -C -i -b -v ${DB_NAME}"
EXPORT="export PGPASSWORD=${PASS}"
RUN="pg_dump ${OPT}"
echo ${EXPORT}
echo ${RUN}
$EXPORT
$RUN
=>但是,如果我想从Java代码中调用它,echo
命令成功(因此脚本已被调用),而不是pg_dump
命令:
int exitValue = 0;
try {
ProcessBuilder pb = new ProcessBuilder(scriptPath);
Process p = pb.start();
BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream()));
String line = null;
while ((line = reader.readLine()) != null) {
LOG.log(Level.FINE, line);
}
exitValue = p.waitFor();
LOG.log(Level.FINE, "Process exitValue: " + exitValue);
} catch (IOException | InterruptedException e) {
LOG.log(Level.SEVERE, "Executing " + scriptPath, e);
return false;
}
return exitValue == 0;
我的问题是为什么同一个脚本来自控制台成功而不是从Java调用它?
答案 0 :(得分:1)
你可以试试这个
try {
ProcessBuilder pb = new ProcessBuilder("script.sh");
Process p = pb.start();
p.waitFor();
System.out.println("Script executed Finish");
}
catch (Exception e)
{
e.printStackTrace();
}
答案 1 :(得分:1)
我猜pg_dump会对输入/输出流做一些相对复杂的事情,所以你可能会遇到http://www.javaworld.com/article/2071275/core-java/when-runtime-exec---won-t.html中列出的一些pitfals文章中有代码清单,在这种情况下可能会有所帮助。