Category Archives: 程式語言

[HBase] security issue

Posted on 2019 年 03 月 18 日 by cowman.chiang

error message: com.a.b.c.exception.BaseDAOException: org.apache.hadoop.hbase.security.AccessDeniedException: org.apache.hadoop.hbase.security.AccessDeniedException: Insufficient permissions for user ‘Cowman’ (table=ABC, action=READ) in jvm conf. add “-DHADOOP_USER_NAME=webuser”

Posted in HBase, Java | Leave a comment

[HBase] convert long value to bytes

Posted on 2018 年 11 月 13 日 by cowman.chiang

Java code:

public static void main(String[] args) {
    String stringValue = Bytes.toStringBinary(Bytes.toBytes(1532080782183l));
    System.out.println(stringValue);
    Long longValue = Bytes.toLong(Bytes.toBytesBinary(stringValue));
    System.out.println(longValue);
}

public static void main(String[] args) {

String stringValue = Bytes.toStringBinary(Bytes.toBytes(1532080782183l));

System.out.println(stringValue);

Long longValue = Bytes.toLong(Bytes.toBytesBinary(stringValue));

System.out.println(longValue);

}

HBase shell command:

hbase(main):056:0> Bytes.toStringBinary(Bytes.to_bytes(1532080782183))
=> "\\x00\\x00\\x01d\\xB7!{g"
hbase(main):057:0> Bytes.toLong("\x00\x00\x01d\xB7!{g".to_java_bytes)
=> 1532080782183

hbase(main):056:0> Bytes.toStringBinary(Bytes.to_bytes(1532080782183))

=> "\\x00\\x00\\x01d\\xB7!{g"

hbase(main):057:0> Bytes.toLong("\x00\x00\x01d\xB7!{g".to_java_bytes)

=> 1532080782183

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[Python] fix error while loading shared libraries: libpython2.7.so.1.0

Posted on 2018 年 07 月 19 日 by cowman.chiang

error log: /opt/rh/python27/root/usr/bin/python: error while loading shared libraries: libpython2.7.so.1.0: cannot open shared object file: No such file or directory check libpython2.7.so.1.0 exist? find . -name ‘libpython2.7.so.1.0’ if the file was exist: edit the ldconfig config echo “/opt/rh/python27/root/usr/lib64” > /etc/ld.so.conf.d/python27.conf ldconfig … Continue reading →

Posted in CentOS, Python | Leave a comment

[Shelll Script] check tomcat status

Posted on 2018 年 07 月 04 日 by cowman.chiang

!/bin/bash tomcat7=$(ps -ef | grep tomcat | wc -l) echo ${#tomcat7} if [ ${#tomcat7} -gt 0 ]; then printf “tomcat is running\n” else printf “tomcat is not running\n” fi

Posted in Linux, Shell Script, Tomcat | Leave a comment

[JavaScript] cannot call methods on [Object] prior to initialization; attempted to call method ‘refresh’

Posted on 2018 年 05 月 29 日 by cowman.chiang

try to force initialize the object first. stackOverflow: selectmenu (‘refresh’, true)

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[Windows Bash Script] convert csv to html table

Posted on 2017 年 10 月 18 日 by cowman.chiang

source: How to find and replace a string in text file using batch file just replace “,” with html table tag.

@echo off
setlocal enabledelayedexpansion
set txtfile=%~1
set newfile=Output.html
if exist "%newfile%" del /f /q "%newfile%"
echo ^<table border='1'^> >> %newfile%
for /f "tokens=*" %%a in (%txtfile%) do (
   set newline=%%a
   set newline=^<tr^>^<td^>!newline:,=^</td^>^<td^>!^</td^>^</tr^>
   echo !newline! >> %newfile%
)
echo ^</table^> >> %newfile%

@echo off

setlocal enabledelayedexpansion

set txtfile=%~1

set newfile=Output.html

if exist "%newfile%" del /f /q "%newfile%"

echo ^<table border='1'^> >> %newfile%

for /f "tokens=*" %%a in (%txtfile%) do (

set newline=%%a

set newline=^<tr^>^<td^>!newline:,=^</td^>^<td^>!^</td^>^</tr^>

echo !newline! >> %newfile%

)

echo ^</table^> >> %newfile%

Posted in Windows Bash Script | 1 Comment

[Java] Convert Hex to String

Posted on 2017 年 08 月 14 日 by cowman.chiang

&lt;code&gt;
public static byte[] hexStringToByteArray(String s) {
    int len = s.length();
    byte[] data = new byte[len / 2];
    for (int i = 0; i &amp;lt; len; i += 2) {
        data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) &amp;lt;&amp;lt; 4)
          + Character.digit(s.charAt(i+1), 16));
    }
    return data;
}
&lt;/code&gt;

<code>

public static byte[] hexStringToByteArray(String s) {

int len = s.length();

byte[] data = new byte[len / 2];

for (int i = 0; i &lt; len; i += 2) {

data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) &lt;&lt; 4)

+ Character.digit(s.charAt(i+1), 16));

}

return data;

}

</code>

stackoverflow: Convert a string representation of a hex dump to a byte array using Java?

Posted in Java | Leave a comment

[Jersey] disable decode the URL path

Posted on 2017 年 06 月 01 日 by cowman.chiang

use annotation “@Encoded” Ex:

@Path("{first}/get")
public Response getYouWant(@Context HttpHeaders httpHeaders, @PathParam("first") String first, @QueryParam("second")  @Encoded String second);

1 2	@Path("{first}/get") public Response getYouWant(@Context HttpHeaders httpHeaders, @PathParam("first") String first, @QueryParam("second") @Encoded String second);

Posted in Java | Leave a comment

open external program from java for mac os x

Posted on 2017 年 03 月 24 日 by cowman.chiang

String[] cmds = {"open",  tempFile.getAbsolutePath(), "-a", "/Applications/Microsoft Office 2011/Microsoft Excel.app"};
Runtime.getRuntime().exec(cmds);

1 2	String[] cmds = {"open", tempFile.getAbsolutePath(), "-a", "/Applications/Microsoft Office 2011/Microsoft Excel.app"}; Runtime.getRuntime().exec(cmds);

Posted in Java, Mac, Office | Leave a comment

Gson usage : formJson

Posted on 2017 年 02 月 17 日 by cowman.chiang

avoid to face the exception ‘java.lang.ClassCastException With com.google.gson.internal.LinkedTreeMap cannot be cast to…’, we use the TypeToken to convert json to List

public class Object {
    @SerializedName("n")
    private String name;
    @SerializedName("i")
    private String id;

    public String getName() {
        return name;
    }

    public Object setName(String name) {
        this.name = name;
        return this;
    }

    public String getId() {
        return id;
    }

    public Object setId(String id) {
        this.id = id;
        return this;
    }
}

// [{"n":"cowman","i":"cowman@xxx.com.tw"}, {"n":"cowman1","i":"cowman1@xxx.com.tw"}]

List<Object> ObjectList = new Gson().fromJson(targets, 
new TypeToken<List<Object>>(){}.getType());

public class Object {

@SerializedName("n")

private String name;

@SerializedName("i")

private String id;

public String getName() {

return name;

}

public Object setName(String name) {

this.name = name;

return this;

}

public String getId() {

return id;

}

public Object setId(String id) {

this.id = id;

return this;

}

// [{"n":"cowman","i":"cowman@xxx.com.tw"}, {"n":"cowman1","i":"cowman1@xxx.com.tw"}]

List<Object> ObjectList = new Gson().fromJson(targets,

new TypeToken<List<Object>>(){}.getType());

Posted in Java | Leave a comment

Category Archives: 程式語言

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