我最终决定一次处理一行文件的成语是:
coproc cat auto/etc/build.cfg
while read -u ${COPROC[0]} BRANCH TARGET SVNSRC SVNTAG BUILDTYPE DISTTYPE DISTARGS
do
... commands ...
done
我知道简单的情况cat我可以使用输入重定向.这是一个简化版本,其中真实版本使用egrep来选择行的子集.
不幸的是,这不起作用.
$ cat test.sh
coproc cat auto/etc/build.cfg
while read -u ${COPROC[0]} BRANCH TARGET SVNSRC SVNTAG BUILDTYPE DISTTYPE DISTARGS
do
echo hello
done
$ bash -x test.sh
+ read -u 63 BRANCH TARGET SVNSRC SVNTAG BUILDTYPE DISTTYPE DISTARGS
+ cat auto/etc/build.cfg
+ echo hello
hello
+ read -u BRANCH TARGET SVNSRC SVNTAG BUILDTYPE DISTTYPE …我想要完成的是能够编写 SQL 语句并验证结果。SQL 语句中会有变量，例如：
String sql = "Select zoneid from zone where zonename = myZoneName";
myZoneName 是从 count + 生成的
注意：我使用 Apache POI 来解析 Excel 电子表格。
这是代码：
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Properties;
import org.apache.log4j.Logger;
import org.junit.Test;
public class VerifyDBSingleDomain {
static Logger log = Logger.getLogger(VerifyDBSingleDomain.class.getName());
String url = "jdbc:oracle:thin:@a.b.c.d:1521:mname";
@Test
public void VerifyDBSingleDomainTest() throws SQLException {
Properties props = new Properties();
props.setProperty("user", "user");
props.setProperty("password", "password");
String sql = "Select zoneid from zone where …在 ItelliJ 上运行此程序时，我遇到一些异常，例如：Exception in thread "main" org.apache.spark.SparkException: Task not serialized Code Snippet :
`
public class MostPopularSuperHero {
public static void main(String args[]) {
SparkConf conf = new SparkConf().setAppName("MostPopularSuperHero").setMaster("local[*]");
JavaSparkContext sc = new JavaSparkContext(conf);
class HrDict {
Map<Integer, String> getHeroDict() {
Map<Integer, String> heroDict = new HashMap<>();
BufferedReader br = null;
try {
String sCurrentLine;
br = new BufferedReader(new FileReader("/Users/11130/udemy/SparkCourse/Marvel-Names.txt"));
while ((sCurrentLine = br.readLine()) != null) {
String str = sCurrentLine;
String[] fields = str.split(" ", 2);
heroDict.put(Integer.parseInt(fields[0]), fields[1]); …我有一个像这样的字符串 -
<phone-residence></phone-residence><marital-status>1</marital-status><phone-on-request></phone-on-request>
我想删除连字符 ( -) 并将每个删除的连字符后面的单个字母字符大写。即从连字符分隔的单词转换为“CamelCase”。
喜欢 -
<phoneResidence></phoneResidence><maritalStatus>1</maritalStatus><phoneOnRequest></phoneOnRequest>
这个怎么做？
我怎么解决这个问题？
哪个是最佳选择，以及如何做到这一点
org.apache.catalina.core.ApplicationContext.log Initializing Spring embedded WebApplicationContext
11-Aug-2018 16:05:53.863 SEVERE [Catalina-startStop-1] org.apache.catalina.core.ContainerBase.startInternal A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[sss].StandardContext[]]
at java.util.concurrent.FutureTask.report(FutureTask.java:122)
at java.util.concurrent.FutureTask.get(FutureTask.java:192)
at ..........
...............
......
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[sss].StandardContext[]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:167)
... 6 more
Caused by: org.springframework.jmx.export.UnableToRegisterMBeanException: Unable to register MBean [HikariDataSource (HikariPool-2)] with key 'dataSource'; nested exception is javax.management.InstanceAlreadyExistsException: com.zaxxer.hikari:name=dataSource,type=HikariDataSource
at org.springframework.jmx.export.MBeanExporter.registerBeanNameOrInstance(MBeanExporter.java:625)
at
..........................
org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5245)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 6 more
Caused by: javax.management.InstanceAlreadyExistsException: com.zaxxer.hikari:name=dataSource,type=HikariDataSource …每次执行应用程序时，我都会收到“startForeground 的错误通知”错误
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.pennskanvtic, PID: 17447
android.app.RemoteServiceException$CannotPostForegroundServiceNotificationException:
Bad notification for startForeground
at android.app.ActivityThread.throwRemoteServiceException(ActivityThread.java:1978)
at android.app.ActivityThread.-$$Nest$mthrowRemoteServiceException(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2237)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loopOnce(Looper.java:201)
at android.os.Looper.loop(Looper.java:288)
at android.app.ActivityThread.main(ActivityThread.java:7884)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)`
我的服务仅启动计时器并显示通知（我尝试在NotificationCompat.Builder中使用setChannelId而不进行任何更改）：
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.pennskanvtic, PID: 17447
android.app.RemoteServiceException$CannotPostForegroundServiceNotificationException:
Bad notification for startForeground
at android.app.ActivityThread.throwRemoteServiceException(ActivityThread.java:1978)
at android.app.ActivityThread.-$$Nest$mthrowRemoteServiceException(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2237)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loopOnce(Looper.java:201)
at android.os.Looper.loop(Looper.java:288)
at android.app.ActivityThread.main(ActivityThread.java:7884)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)`
我的 MainActivity 在 onStart() 内请求许可：
public class …我有一组XML文件,我正在使用XSL转换处理.它们有一个默认的命名空间,所以我的XSL转换必须包含声明:
XPath的默认名称空间= "瓮:CZ-RVV-IS-VAV-XML-NS:数据1.2.2"
问题是这个值不时变化,我的变换突然停止工作,直到我从新文件中查看一个例子,提取这个命名空间ID并将其放入变换中,从而转换停止对旧文件起作用.有没有办法将其作为参数传递,或者在运行时以某种方式设置它？我已经尝试了在各种教程中查找的参数语法,但没有一个适用于此特定用途.
我搜索了各种各样的论坛,发现了对XSL的命名空间不可知编码的引用,但没有弄清楚如何去做.Ian Williams的书"XSLT和Xpath"声明必须声明默认命名空间,或者输出流中没有任何内容,这就是它对我有用的方式.但是我真的不想经常手工改变这个,我想给用户一些有用的东西,而不需要我的关注.
到目前为止,我发明的唯一100%可靠的方法是使用标准编程语言将XML源和XSL转换作为文本文件打开,从XML源提取URI,将其粘贴到XSL转换中,关闭两个文件和然后,最后运行实际的转换.这很有效,但令人难以置信的是,至少根据我的口味.如何更好地处理更改默认命名空间？
皮特
我正在尝试使用MySQL数据库(安装在我的电脑上的虚拟机(Debian)上并具有IP地址192.168.1.5)来使用NetBeans.
我已按如下方式配置连接:
Driver Name MySQL(Connector/J Driver)
Host 192.168.1.5
Database test
Username root
Password *
JDBC URL jdbc:mysql://192.168.1.5:3306/test
然后我收到以下错误:
cannot establish a connection to jdbc:mysql://192.168.1.5:3306/test using
com.mysql.jdbc.Driver (Communications link failure The last packet sent successfully
to the server was 0 milliseconds ago. The driver has not received any packets
from the server.)
我的mysql.user表看起来像这样(我知道% root这不是很安全,但这只是为了简化目前的事情):
+------------+------------------+
| host | user |
+------------+------------------+
| % | root |
| 127.0.0.1 | root |
| ::1 | root …在我的数据库中,我有3个名为的表items,manufacturers和items_manufacturers.manufacturers有一个HAS:很多关系items_manufacturers
我的items桌子
+---------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+---------------+--------------+------+-----+---------+----------------+
| id | bigint(20) | NO | PRI | NULL | auto_increment |
| code | varchar(25) | NO | MUL | NULL | |
| item_category | varchar(100) | NO | | NULL | |
| item_desc | varchar(500) | NO | | NULL | |
| reorder_point | int(11) | …假设您有以下代码:
public abstract class DecisionFunctionJ {
public abstract double evaluate();
public DecisionFunctionJ add(final DecisionFunctionJ another) {
return new DecisionFunctionJ() {
@Override
public double evaluate() {
return this.evaluate() + another.evaluate();
}
};
}
}
这段代码并不像预期的那样有效,因为它导致了无限循环/ StackOverflowException.原因很明显:this.evaluate()引用evaluate内部匿名类的evaluate方法而不是外部抽象类的方法.
我该如何执行外部evaluate方法？使用DecisionFunctionJ.this.evaluate()没有帮助,因为这两个类都是类型DecitionFunctionJ.
还有什么其他可能性？
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