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Java 将CSV列表转换为字符串数组。

欢马劈雪

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将CSV列表转换为字符串数组。

实例源码：

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//package com.nowjava;

import java.util.ArrayList;/*nowjava.com - 时  代  Java*/

import java.util.Collection;

import java.util.Collections;

import java.util.Enumeration;

import java.util.List;

public class Main {

public static void main(String[] argv) throws Exception {

String str = "nowjava.com";

System.out.println(java.util.Arrays

.toString(commaDelimitedListToStringArray(str)));

}

/**

* Convert a CSV list into an array of Strings.

* @param str

*            the input String

* @return an array of Strings, or the empty array in case of empty input

public static String[] commaDelimitedListToStringArray(final String str) {

/* 
     来自 
    *NowJava.com - 时代Java*/

return delimitedListToStringArray(str, ",");

}

/**

* Take a String which is a delimited list and convert it to a String array. <p>A single delimiter can

* consists of more than one character: It will still be considered as single delimiter string, rather

* than as bunch of potential delimiter characters - in contrast to <code>tokenizeToStringArray</code>.

* @param str

*            the input String

* @param delimiter

*            the delimiter between elements (this is a single delimiter, rather than a bunch individual

*            delimiter characters)

* @return an array of the tokens in the list

* @see #tokenizeToStringArray

public static String[] delimitedListToStringArray(final String str,

final String delimiter) {

return delimitedListToStringArray(str, delimiter, null);

}

/**

* Take a String which is a delimited list and convert it to a String array. <p>A single delimiter can

* consists of more than one character: It will still be considered as single delimiter string, rather

* than as bunch of potential delimiter characters - in contrast to <code>tokenizeToStringArray</code>.

* @param str

*            the input String

* @param delimiter

*            the delimiter between elements (this is a single delimiter, rather than a bunch individual

*            delimiter characters)

* @param charsToDelete

*            a set of characters to delete. Useful for deleting unwanted line breaks: e.g. "\r\n\f" will

*            delete all new lines and line feeds in a String.

* @return an array of the tokens in the list

* @see #tokenizeToStringArray

public static String[] delimitedListToStringArray(final String str,

final String delimiter, final String charsToDelete) {

if (str == null)

return new String[0];

if (delimiter == null)

return new String[] { str };

final List<String> result = new ArrayList<String>();

if ("".equals(delimiter)) {

for (int i = 0; i < str.length(); i++) {

result.add(deleteAny(str.substring(i, i + 1), charsToDelete));

}

} else {

int pos = 0;

int delPos;

while ((delPos = str.indexOf(delimiter, pos)) != -1) {

result.add(deleteAny(str.substring(pos, delPos),

charsToDelete));

pos = delPos + delimiter.length();

}

if ((str.length() > 0) && (pos <= str.length())) {

// Add rest of String, but not in case of empty input.

result.add(deleteAny(str.substring(pos), charsToDelete));

}

return toStringArray(result);

}

/**

* Delete any character in a given String.

* @param inString

*            the original String

* @param charsToDelete

*            a set of characters to delete. E.g. "az\n" will delete 'a's, 'z's and new lines.

* @return the resulting String

public static String deleteAny(final String inString,

final String charsToDelete) {

if (!hasLength(inString) || !hasLength(charsToDelete))

return inString;

final StringBuilder sb = new StringBuilder();

for (int i = 0; i < inString.length(); i++) {

final char c = inString.charAt(i);

if (charsToDelete.indexOf(c) == -1) {

sb.append(c);

}

return sb.toString();

}

/**

* Copy the given Collection into a String array. The Collection must contain String elements only.

* @param collection

*            the Collection to copy

* @return the String array (<code>null</code> if the passed-in Collection was <code>null</code>)

public static String[] toStringArray(final Collection<String> collection) {

if (collection == null)

return null;

return collection.toArray(new String[collection.size()]);

}

/**

* Copy the given Enumeration into a String array. The Enumeration must contain String elements only.

* @param enumeration

*            the Enumeration to copy

* @return the String array (<code>null</code> if the passed-in Enumeration was <code>null</code>)

public static String[] toStringArray(

final Enumeration<String> enumeration) {

if (enumeration == null)

return null;

final List<String> list = Collections.list(enumeration);

return list.toArray(new String[list.size()]);

}

/**

* Check that the given CharSequence is neither <code>null</code> nor of length 0. Note: Will return
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编辑于 2020-03-26 09:23:272020-03-26 09:23:27

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