spark应用程序如何在Java项目中运行
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如下所示：
package org.shirdrn.spark.job;
import java.io.File;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.regex.Pattern;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.spark.api.java.JavaPairRDD;
import org.apache.spark.api.java.JavaRDD;
import org.apache.spark.api.java.JavaSparkContext;
import org.apache.spark.api.java.function.FlatMapFunction;
import org.apache.spark.api.java.function.Function2;
import org.apache.spark.api.java.function.PairFunction;
import org.shirdrn.spark.job.maxmind.Country;
import org.shirdrn.spark.job.maxmind.LookupService;
import scala.Serializable;
import scala.Tuple2;
public class IPAddressStats implements Serializable {
private static final long serialVersionUID = 8533489548835413763L;
private static final Log LOG = LogFactory.getLog(IPAddressStats.class);
private static final Pattern SPACE = Pattern.compile(" ");
private transient LookupService lookupService;
private transient final String geoIPFile;
public IPAddressStats(String geoIPFile) {
this.geoIPFile = geoIPFile;
try {
// lookupService: get country code from a IP address
File file = new File(this.geoIPFile);
LOG.info("GeoIP file: " + file.getAbsolutePath());
lookupService = new AdvancedLookupService(file, LookupService.GEOIP_MEMORY_CACHE);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
@SuppressWarnings("serial")
public void stat(String[] args) {
JavaSparkContext ctx = new JavaSparkContext(args[0], "IPAddressStats",
System.getenv("SPARK_HOME"), JavaSparkContext.jarOfClass(IPAddressStats.class));
JavaRDD lines = ctx.textFile(args[1], 1);
// splits and extracts ip address filed
JavaRDD words = lines.flatMap(new FlatMapFunction() {
@Override
public Iterable call(String s) {
// 121.205.198.92 - - [21/Feb/2014:00:00:07 +0800] "GET /archives/417.html HTTP/1.1" 200 11465 "http://shiyanjun.cn/archives/417.html/" "Mozilla/5.0 (Windows NT 5.1; rv:11.0) Gecko/20100101 Firefox/11.0"
// ip address
return Arrays.asList(SPACE.split(s)[0]);
}
});
// map
JavaPairRDD ones = words.map(new PairFunction() {
@Override
public Tuple2 call(String s) {
return new Tuple2(s, 1);
}
});
// reduce
JavaPairRDD counts = ones.reduceByKey(new Function2() {
@Override
public Integer call(Integer i1, Integer i2) {
return i1 + i2;
}
});
List> output = counts.collect();
// sort statistics result by value
Collections.sort(output, new Comparator>() {
@Override
public int compare(Tuple2 t1, Tuple2 t2) {
if(t1._2 < t2._2) {
return 1;
} else if(t1._2 > t2._2) {
return -1;
}
return 0;
}
});
writeTo(args, output);
}
private void writeTo(String[] args, List> output) {
for (Tuple2<?, ?> tuple : output) {
Country country = lookupService.getCountry((String) tuple._1);
LOG.info("[" + country.getCode() + "] " + tuple._1 + "\t" + tuple._2);
}
}
public static void main(String[] args) {
// ./bin/run-my-java-example org.shirdrn.spark.job.IPAddressStats spark://m1:7077 hdfs://m1:9000/user/shirdrn/wwwlog20140222.log /home/shirdrn/cloud/programs/spark-0.9.0-incubating-bin-hadoop1/java-examples/GeoIP_DATABASE.dat
if (args.length < 3) {
System.err.println("Usage: IPAddressStats ");
System.err.println(" Example: org.shirdrn.spark.job.IPAddressStats spark://m1:7077 hdfs://m1:9000/user/shirdrn/wwwlog20140222.log /home/shirdrn/cloud/programs/spark-0.9.0-incubating-bin-hadoop1/java-examples/GeoIP_DATABASE.dat");
System.exit(1);
}
String geoIPFile = args[2];
IPAddressStats stats = new IPAddressStats(geoIPFile);
stats.stat(args);
System.exit(0);
}
} 具体实现逻辑，可以参考代码中的注释。我们使用Maven管理构建Java程序，首先看一下我的pom配置中所依赖的软件包，如下所示：
org.apache.spark spark-core_2.10 0.9.0-incubating log4j log4j 1.2.16 DNSjava dnsjava 2.1.1 commons-net commons-net 3.1 org.apache.hadoop hadoop-client 1.2.1
需要说明的是，当我们将程序在Spark集群上运行时，它要求我们的编写的Job能够进行序列化，如果某些字段不需要序列化或者无法序列化，可以直接使用transient修饰即可，如上面的属性lookupService没有实现序列化接口，使用transient使其不执行序列化，否则的话，可能会出现类似如下的错误：
14/03/10 22:34:06 INFO scheduler.DAGScheduler: Failed to run collect at IPAddressStats.java:76 Exception in thread "main" org.apache.spark.SparkException: Job aborted: Task not serializable: java.io.NotSerializableException: org.shirdrn.spark.job.IPAddressStats at org.apache.spark.scheduler.DAGScheduler$$anonfun$org$apache$spark$scheduler$DAGScheduler$$abortStage$1.apply(DAGScheduler.scala:1028) at org.apache.spark.scheduler.DAGScheduler$$anonfun$org$apache$spark$scheduler$DAGScheduler$$abortStage$1.apply(DAGScheduler.scala:1026) at scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59) at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:47) at org.apache.spark.scheduler.DAGScheduler.org$apache$spark$scheduler$DAGScheduler$$abortStage(DAGScheduler.scala:1026) at org.apache.spark.scheduler.DAGScheduler.org$apache$spark$scheduler$DAGScheduler$$submitMissingTasks(DAGScheduler.scala:794) at org.apache.spark.scheduler.DAGScheduler.org$apache$spark$scheduler$DAGScheduler$$submitStage(DAGScheduler.scala:737) at org.apache.spark.scheduler.DAGScheduler$$anonfun$org$apache$spark$scheduler$DAGScheduler$$submitStage$4.apply(DAGScheduler.scala:741) at org.apache.spark.scheduler.DAGScheduler$$anonfun$org$apache$spark$scheduler$DAGScheduler$$submitStage$4.apply(DAGScheduler.scala:740) at scala.collection.immutable.List.foreach(List.scala:318) at org.apache.spark.scheduler.DAGScheduler.org$apache$spark$scheduler$DAGScheduler$$submitStage(DAGScheduler.scala:740) at org.apache.spark.scheduler.DAGScheduler.processEvent(DAGScheduler.scala:569) at org.apache.spark.scheduler.DAGScheduler$$anonfun$start$1$$anon$2$$anonfun$receive$1.applyOrElse(DAGScheduler.scala:207) at akka.actor.ActorCell.receiveMessage(ActorCell.scala:498) at akka.actor.ActorCell.invoke(ActorCell.scala:456) at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:237) at akka.dispatch.Mailbox.run(Mailbox.scala:219) at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:386) at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260) at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339) at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979) at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
在Spark集群上运行Java程序
这里，我使用了Maven管理构建Java程序，实现上述代码以后，使用Maven的maven-assembly-plugin插件，配置内容如下所示：
maven-assembly-plugin org.shirdrn.spark.job.UserAgentStats jar-with-dependencies *.properties *.xml make-assembly package single
将相关依赖库文件都打进程序包里面，最后拷贝JAR文件到Linux系统下（不一定非要在Spark集群的Master节点上），保证该节点上Spark的环境变量配置正确即可看。Spark软件发行包解压缩后，可以看到脚本bin/run-example，我们可以直接修改该脚本，将对应的路径指向我们实现的Java程序包（修改变量EXAMPLES_DIR以及我们的JAR文件存放位置相关的内容），使用该脚本就可以运行，脚本内容如下所示：
cygwin=false case "`uname`" in CYGWIN*) cygwin=true;; esac SCALA_VERSION=2.10 # Figure out where the Scala framework is installed FWDIR="$(cd `dirname $0`/..; pwd)" # Export this as SPARK_HOME export SPARK_HOME="$FWDIR" # Load environment variables from conf/spark-env.sh, if it exists if [ -e "$FWDIR/conf/spark-env.sh" ] ; then . $FWDIR/conf/spark-env.sh fi if [ -z "$1" ]; then echo "Usage: run-example[ ]" >&2 exit 1 fi # Figure out the JAR file that our examples were packaged into. This includes a bit of a hack # to avoid the -sources and -doc packages that are built by publish-local. EXAMPLES_DIR="$FWDIR"/java-examples SPARK_EXAMPLES_JAR="" if [ -e "$EXAMPLES_DIR"/*.jar ]; then export SPARK_EXAMPLES_JAR=`ls "$EXAMPLES_DIR"/*.jar` fi if [[ -z $SPARK_EXAMPLES_JAR ]]; then echo "Failed to find Spark examples assembly in $FWDIR/examples/target" >&2 echo "You need to build Spark with sbt/sbt assembly before running this program" >&2 exit 1 fi # Since the examples JAR ideally shouldn't include spark-core (that dependency should be # "provided"), also add our standard Spark classpath, built using compute-classpath.sh. CLASSPATH=`$FWDIR/bin/compute-classpath.sh` CLASSPATH="$SPARK_EXAMPLES_JAR:$CLASSPATH" if $cygwin; then CLASSPATH=`cygpath -wp $CLASSPATH` export SPARK_EXAMPLES_JAR=`cygpath -w $SPARK_EXAMPLES_JAR` fi # Find java binary if [ -n "${JAVA_HOME}" ]; then RUNNER="${JAVA_HOME}/bin/java" else if [ `command -v java` ]; then RUNNER="java" else echo "JAVA_HOME is not set" >&2 exit 1 fi fi # Set JAVA_OPTS to be able to load native libraries and to set heap size JAVA_OPTS="$SPARK_JAVA_OPTS" JAVA_OPTS="$JAVA_OPTS -Djava.library.path=$SPARK_LIBRARY_PATH" # Load extra JAVA_OPTS from conf/java-opts, if it exists if [ -e "$FWDIR/conf/java-opts" ] ; then JAVA_OPTS="$JAVA_OPTS `cat $FWDIR/conf/java-opts`" fi export JAVA_OPTS if [ "$SPARK_PRINT_LAUNCH_COMMAND" == "1" ]; then echo -n "Spark Command: " echo "$RUNNER" -cp "$CLASSPATH" $JAVA_OPTS "$@" echo "========================================" echo fi exec "$RUNNER" -cp "$CLASSPATH" $JAVA_OPTS "$@"
在Spark上运行我们开发的Java程序，执行如下命令：
cd /home/shirdrn/cloud/programs/spark-0.9.0-incubating-bin-hadoop1 ./bin/run-my-java-example org.shirdrn.spark.job.IPAddressStats spark://m1:7077 hdfs://m1:9000/user/shirdrn/wwwlog20140222.log /home/shirdrn/cloud/programs/spark-0.9.0-incubating-bin-hadoop1/java-examples/GeoIP_DATABASE.dat
我实现的程序类org.shirdrn.spark.job.IPAddressStats运行需要3个参数：
Spark集群主节点URL：例如我的是spark://m1:7077
输入文件路径：业务相关的，我这里是从HDFS上读取文件hdfs://m1:9000/user/shirdrn/wwwlog20140222.log
GeoIP库文件：业务相关的，用来计算IP地址所属国家的外部文件
如果程序没有错误，能够正常运行，控制台输出程序运行日志，示例如下所示：
14/03/10 22:17:24 INFO job.IPAddressStats: GeoIP file: /home/shirdrn/cloud/programs/spark-0.9.0-incubating-bin-hadoop1/java-examples/GeoIP_DATABASE.dat
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/home/shirdrn/cloud/programs/spark-0.9.0-incubating-bin-hadoop1/java-examples/spark-0.0.1-SNAPSHOT-jar-with-dependencies.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/home/shirdrn/cloud/programs/spark-0.9.0-incubating-bin-hadoop1/assembly/target/scala-2.10/spark-assembly_2.10-0.9.0-incubating-hadoop1.0.4.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
14/03/10 22:17:25 INFO slf4j.Slf4jLogger: Slf4jLogger started
14/03/10 22:17:25 INFO Remoting: Starting remoting
14/03/10 22:17:25 INFO Remoting: Remoting started; listening on addresses :[akka.tcp://spark@m1:57379]
14/03/10 22:17:25 INFO Remoting: Remoting now listens on addresses: [akka.tcp://spark@m1:57379]
14/03/10 22:17:25 INFO spark.SparkEnv: Registering BlockManagerMaster
14/03/10 22:17:25 INFO storage.DiskBlockManager: Created local directory at /tmp/spark-local-20140310221725-c1cb
14/03/10 22:17:25 INFO storage.MemoryStore: MemoryStore started with capacity 143.8 MB.
14/03/10 22:17:25 INFO network.ConnectionManager: Bound socket to port 45189 with id = ConnectionManagerId(m1,45189)
14/03/10 22:17:25 INFO storage.BlockManagerMaster: Trying to register BlockManager
14/03/10 22:17:25 INFO storage.BlockManagerMasterActor$BlockManagerInfo: Registering block manager m1:45189 with 143.8 MB RAM
14/03/10 22:17:25 INFO storage.BlockManagerMaster: Registered BlockManager
14/03/10 22:17:25 INFO spark.HttpServer: Starting HTTP Server
14/03/10 22:17:25 INFO server.Server: jetty-7.x.y-SNAPSHOT
14/03/10 22:17:25 INFO server.AbstractConnector: Started SocketConnector@0.0.0.0:49186
14/03/10 22:17:25 INFO broadcast.HttpBroadcast: Broadcast server started at http://10.95.3.56:49186
14/03/10 22:17:25 INFO spark.SparkEnv: Registering MapOutputTracker
14/03/10 22:17:25 INFO spark.HttpFileServer: HTTP File server directory is /tmp/spark-56c3e30d-a01b-4752-83d1-af1609ab2370
14/03/10 22:17:25 INFO spark.HttpServer: Starting HTTP Server
14/03/10 22:17:25 INFO server.Server: jetty-7.x.y-SNAPSHOT
14/03/10 22:17:25 INFO server.AbstractConnector: Started SocketConnector@0.0.0.0:52073
14/03/10 22:17:26 INFO server.Server: jetty-7.x.y-SNAPSHOT
14/03/10 22:17:26 INFO handler.ContextHandler: started o.e.j.s.h.ContextHandler{/storage/rdd,null}
14/03/10 22:17:26 INFO handler.ContextHandler: started o.e.j.s.h.ContextHandler{/storage,null}
14/03/10 22:17:26 INFO handler.ContextHandler: started o.e.j.s.h.ContextHandler{/stages/stage,null}
14/03/10 22:17:26 INFO handler.ContextHandler: started o.e.j.s.h.ContextHandler{/stages/pool,null}
14/03/10 22:17:26 INFO handler.ContextHandler: started o.e.j.s.h.ContextHandler{/stages,null}
14/03/10 22:17:26 INFO handler.ContextHandler: started o.e.j.s.h.ContextHandler{/environment,null}
14/03/10 22:17:26 INFO handler.ContextHandler: started o.e.j.s.h.ContextHandler{/executors,null}
14/03/10 22:17:26 INFO handler.ContextHandler: started o.e.j.s.h.ContextHandler{/metrics/json,null}
14/03/10 22:17:26 INFO handler.ContextHandler: started o.e.j.s.h.ContextHandler{/static,null}
14/03/10 22:17:26 INFO handler.ContextHandler: started o.e.j.s.h.ContextHandler{/,null}
14/03/10 22:17:26 INFO server.AbstractConnector: Started SelectChannelConnector@0.0.0.0:4040
14/03/10 22:17:26 INFO ui.SparkUI: Started Spark Web UI at http://m1:4040
14/03/10 22:17:26 INFO spark.SparkContext: Added JAR /home/shirdrn/cloud/programs/spark-0.9.0-incubating-bin-hadoop1/java-examples/spark-0.0.1-SNAPSHOT-jar-with-dependencies.jar at http://10.95.3.56:52073/jars/spark-0.0.1-SNAPSHOT-jar-with-dependencies.jar with timestamp 1394515046396
14/03/10 22:17:26 INFO client.AppClient$ClientActor: Connecting to master spark://m1:7077...
14/03/10 22:17:26 INFO storage.MemoryStore: ensureFreeSpace(60341) called with curMem=0, maxMem=150837657
14/03/10 22:17:26 INFO storage.MemoryStore: Block broadcast_0 stored as values to memory (estimated size 58.9 KB, free 143.8 MB)
14/03/10 22:17:26 INFO cluster.SparkDeploySchedulerBackend: Connected to Spark cluster with app ID app-20140310221726-0000
14/03/10 22:17:27 INFO client.AppClient$ClientActor: Executor added: app-20140310221726-0000/0 on worker-20140310221648-s1-52544 (s1:52544) with 1 cores
14/03/10 22:17:27 INFO cluster.SparkDeploySchedulerBackend: Granted executor ID app-20140310221726-0000/0 on hostPort s1:52544 with 1 cores, 512.0 MB RAM
14/03/10 22:17:27 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
14/03/10 22:17:27 WARN snappy.LoadSnappy: Snappy native library not loaded
14/03/10 22:17:27 INFO client.AppClient$ClientActor: Executor updated: app-20140310221726-0000/0 is now RUNNING
14/03/10 22:17:27 INFO mapred.FileInputFormat: Total input paths to process : 1
14/03/10 22:17:27 INFO spark.SparkContext: Starting job: collect at IPAddressStats.java:77
14/03/10 22:17:27 INFO scheduler.DAGScheduler: Registering RDD 4 (reduceByKey at IPAddressStats.java:70)
14/03/10 22:17:27 INFO scheduler.DAGScheduler: Got job 0 (collect at IPAddressStats.java:77) with 1 output partitions (allowLocal=false)
14/03/10 22:17:27 INFO scheduler.DAGScheduler: Final stage: Stage 0 (collect at IPAddressStats.java:77)
14/03/10 22:17:27 INFO scheduler.DAGScheduler: Parents of final stage: List(Stage 1)
14/03/10 22:17:27 INFO scheduler.DAGScheduler: Missing parents: List(Stage 1)
14/03/10 22:17:27 INFO scheduler.DAGScheduler: Submitting Stage 1 (MapPartitionsRDD[4] at reduceByKey at IPAddressStats.java:70), which has no missing parents
14/03/10 22:17:27 INFO scheduler.DAGScheduler: Submitting 1 missing tasks from Stage 1 (MapPartitionsRDD[4] at reduceByKey at IPAddressStats.java:70)
14/03/10 22:17:27 INFO scheduler.TaskSchedulerImpl: Adding task set 1.0 with 1 tasks
14/03/10 22:17:28 INFO cluster.SparkDeploySchedulerBackend: Registered executor: Actor[akka.tcp://sparkExecutor@s1:59233/user/Executor#-671170811] with ID 0
14/03/10 22:17:28 INFO scheduler.TaskSetManager: Starting task 1.0:0 as TID 0 on executor 0: s1 (PROCESS_LOCAL)
14/03/10 22:17:28 INFO scheduler.TaskSetManager: Serialized task 1.0:0 as 2396 bytes in 5 ms
14/03/10 22:17:29 INFO storage.BlockManagerMasterActor$BlockManagerInfo: Registering block manager s1:47282 with 297.0 MB RAM
14/03/10 22:17:32 INFO scheduler.TaskSetManager: Finished TID 0 in 3376 ms on s1 (progress: 0/1)
14/03/10 22:17:32 INFO scheduler.DAGScheduler: Completed ShuffleMapTask(1, 0)
14/03/10 22:17:32 INFO scheduler.DAGScheduler: Stage 1 (reduceByKey at IPAddressStats.java:70) finished in 4.420 s
14/03/10 22:17:32 INFO scheduler.DAGScheduler: looking for newly runnable stages
14/03/10 22:17:32 INFO scheduler.DAGScheduler: running: Set()
14/03/10 22:17:32 INFO scheduler.DAGScheduler: waiting: Set(Stage 0)
14/03/10 22:17:32 INFO scheduler.DAGScheduler: failed: Set()
14/03/10 22:17:32 INFO scheduler.TaskSchedulerImpl: Remove TaskSet 1.0 from pool
14/03/10 22:17:32 INFO scheduler.DAGScheduler: Missing parents for Stage 0: List()
14/03/10 22:17:32 INFO scheduler.DAGScheduler: Submitting Stage 0 (MapPartitionsRDD[6] at reduceByKey at IPAddressStats.java:70), which is now runnable
14/03/10 22:17:32 INFO scheduler.DAGScheduler: Submitting 1 missing tasks from Stage 0 (MapPartitionsRDD[6] at reduceByKey at IPAddressStats.java:70)
14/03/10 22:17:32 INFO scheduler.TaskSchedulerImpl: Adding task set 0.0 with 1 tasks
14/03/10 22:17:32 INFO scheduler.TaskSetManager: Starting task 0.0:0 as TID 1 on executor 0: s1 (PROCESS_LOCAL)
14/03/10 22:17:32 INFO scheduler.TaskSetManager: Serialized task 0.0:0 as 2255 bytes in 1 ms
14/03/10 22:17:32 INFO spark.MapOutputTrackerMasterActor: Asked to send map output locations for shuffle 0 to spark@s1:33534
14/03/10 22:17:32 INFO spark.MapOutputTrackerMaster: Size of output statuses for shuffle 0 is 120 bytes
14/03/10 22:17:32 INFO scheduler.TaskSetManager: Finished TID 1 in 282 ms on s1 (progress: 0/1)
14/03/10 22:17:32 INFO scheduler.DAGScheduler: Completed ResultTask(0, 0)
14/03/10 22:17:32 INFO scheduler.DAGScheduler: Stage 0 (collect at IPAddressStats.java:77) finished in 0.314 s
14/03/10 22:17:32 INFO scheduler.TaskSchedulerImpl: Remove TaskSet 0.0 from pool
14/03/10 22:17:32 INFO spark.SparkContext: Job finished: collect at IPAddressStats.java:77, took 4.870958309 s
14/03/10 22:17:32 INFO job.IPAddressStats: [CN] 58.246.49.218 312
14/03/10 22:17:32 INFO job.IPAddressStats: [KR] 1.234.83.77 300
14/03/10 22:17:32 INFO job.IPAddressStats: [CN] 120.43.11.16 212
14/03/10 22:17:32 INFO job.IPAddressStats: [CN] 110.85.72.254 207
14/03/10 22:17:32 INFO job.IPAddressStats: [CN] 27.150.229.134 185
14/03/10 22:17:32 INFO job.IPAddressStats: [HK] 180.178.52.181 181
14/03/10 22:17:32 INFO job.IPAddressStats: [CN] 120.37.210.212 180
14/03/10 22:17:32 INFO job.IPAddressStats: [CN] 222.77.226.83 176
14/03/10 22:17:32 INFO job.IPAddressStats: [CN] 120.43.11.205 169
14/03/10 22:17:32 INFO job.IPAddressStats: [CN] 120.43.9.19 165
...我们也可以通过Web控制台来查看当前执行应用程序（Application）的状态信息，通过Master节点的8080端口（如：http://m1:8080/）就能看到集群的应用程序（Application）状态信息。
另外，需要说明的时候，如果在Unix环境下使用Eclipse使用Java开发Spark应用程序，也能够直接通过Eclipse连接Spark集群，并提交开发的应用程序，然后交给集群去处理。
关于spark应用程序如何在Java项目中运行就分享到这里了，希望以上内容可以对大家有一定的帮助，可以学到更多知识。如果觉得文章不错，可以把它分享出去让更多的人看到。
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