A Java karakterlánc osztály getBytes() metódus elvégzi a karakterlánc kódolását a bájtok sorozatába, és egy bájttömbben tartja.
Aláírás
A getBytes() metódusnak három változata létezik. A string getBytes() metódus aláírása vagy szintaxisa az alábbiakban látható:
public byte[] getBytes() public byte[] getBytes(Charset charset) public byte[] getBytes(String charsetName)throws UnsupportedEncodingException
Paraméterek
charset / charsetName – A metódus által támogatott karakterkészlet neve.
Visszatér
Bájtok sorozata.
Kivétel dobások
UnsupportedEncodingException: Akkor dobja ki, ha az említett karakterkészletet nem támogatja a metódus.
Belső megvalósítás
public byte[] getBytes() { return StringCoding.encode(value, 0, value.length); } String osztály getBytes() módszer példa
A paraméter nélküli getBytes() metódus a sztringet a platform alapértelmezett karakterkészletével kódolja, amely UTF - 8. A következő két példa ugyanezt mutatja.
építő tervezési minta
Fájl név: StringGetBytesExample.java
public class StringGetBytesExample{ public static void main(String args[]){ String s1='ABCDEFG'; byte[] barr=s1.getBytes(); for(int i=0;i <barr.length;i++){ system.out.println(barr[i]); } }} < pre> <span> Test it Now </span> <p> <strong>Output:</strong> </p> <pre> 65 66 67 68 69 70 71 </pre> <h2>Java String class getBytes() Method Example 2</h2> <p> <strong>FileName:</strong> StringGetBytesExample2.java</p> <p>The method returns a byte array that again can be passed to the String constructor to get String.</p> <pre> public class StringGetBytesExample2 { public static void main(String[] args) { String s1 = 'ABCDEFG'; byte[] barr = s1.getBytes(); for(int i=0;i <barr.length;i++){ system.out.println(barr[i]); } getting string back s2="new" string(barr); system.out.println(s2); < pre> <span> Test it Now </span> <p> <strong>Output:</strong> </p> <pre> 65 66 67 68 69 70 71 ABCDEFG </pre> <h2>Java String class getBytes() Method Example 3</h2> <p>The following example shows the encoding into a different charset.</p> <p> <strong>FileName:</strong> StringGetBytesExample3.java</p> <pre> // Import statement import java.io.*; public class StringGetBytesExample3 { // main method public static void main(String argvs[]) { // input string String str = 'Welcome to JavaTpoint.'; System.out.println('The input String is : '); System.out.println(str + '
'); // inside try block encoding is // being done using different charsets try { 16 - bit UCS Transformation format byte[] byteArr = str.getBytes('UTF-16'); System.out.println('After converted into UTF-16 the String is : '); for (int j = 0; j <bytearr.length; 16 j++) { system.out.print(bytearr[j]); } system.out.println('
'); big endian byte order, - bit ucs transformation format byte[] bytearr1="str.getBytes('UTF-16BE');" system.out.println('after converted into utf-16be the string is : '); for (int j="0;" < bytearr1.length; system.out.print(bytearr1[j]); iso latin alphabet bytearr2="str.getBytes('ISO-8859-1');" iso-8859-1 bytearr2.length; system.out.print(bytearr2[j]); little bytearr3="str.getBytes('UTF-16LE');" utf-16le bytearr3.length; system.out.print(bytearr3[j]); catch (unsupportedencodingexception g) system.out.println('unsupported character set' + g); pre> <p> <strong>Output:</strong> </p> <pre> The input String is : Welcome to JavaTpoint. After converted into UTF-16 the String is : -2-10870101010809901110109010103201160111032074097011809708401120111010501100116046 After converted into UTF-16BE the String is : 0870101010809901110109010103201160111032074097011809708401120111010501100116046 After converted into ISO-8859-1 the String is : 871011089911110910132116111327497118978411211110511011646 After converted into UTF-16LE the String is : 8701010108099011101090101032011601110320740970118097084011201110105011001160460 </pre> <h2>Java String class getBytes() Method Example 4</h2> <p>The following example shows when the charset is not supported by the getBytes() method, UnsupportedEncodingException is thrown.</p> <p> <strong>FileName:</strong> StringGetBytesExample4.java</p> <pre> public class StringGetBytesExample4 { // main method public static void main(String argvs[]) { // input string String str = 'Welcome to JavaTpoint.'; System.out.println('The input String is : '); System.out.println(str + '
'); // encoding into UTF - 17 byte[] byteArr = str.getBytes('UTF-17'); System.out.println('After converted into UTF-17 the String is : '); for (int j = 0; j <bytearr.length; j++) { system.out.print(bytearr[j]); } < pre> <p> <strong>Output:</strong> </p> <pre> /StringGetBytesExample4.java:11: error: unreported exception UnsupportedEncodingException; must be caught or declared to be thrown byte[] byteArr = str.getBytes('UTF-17'); ^ 1 error </pre> <hr></bytearr.length;></pre></bytearr.length;></pre></barr.length;i++){></pre></barr.length;i++){> Java String osztály getBytes() 2. módszer példa
Fájl név: StringGetBytesExample2.java
A metódus egy bájttömböt ad vissza, amelyet ismét át lehet adni a String konstruktornak a String lekéréséhez.
public class StringGetBytesExample2 { public static void main(String[] args) { String s1 = 'ABCDEFG'; byte[] barr = s1.getBytes(); for(int i=0;i <barr.length;i++){ system.out.println(barr[i]); } getting string back s2="new" string(barr); system.out.println(s2); < pre> <span> Test it Now </span> <p> <strong>Output:</strong> </p> <pre> 65 66 67 68 69 70 71 ABCDEFG </pre> <h2>Java String class getBytes() Method Example 3</h2> <p>The following example shows the encoding into a different charset.</p> <p> <strong>FileName:</strong> StringGetBytesExample3.java</p> <pre> // Import statement import java.io.*; public class StringGetBytesExample3 { // main method public static void main(String argvs[]) { // input string String str = 'Welcome to JavaTpoint.'; System.out.println('The input String is : '); System.out.println(str + '
'); // inside try block encoding is // being done using different charsets try { 16 - bit UCS Transformation format byte[] byteArr = str.getBytes('UTF-16'); System.out.println('After converted into UTF-16 the String is : '); for (int j = 0; j <bytearr.length; 16 j++) { system.out.print(bytearr[j]); } system.out.println(\'
\'); big endian byte order, - bit ucs transformation format byte[] bytearr1="str.getBytes('UTF-16BE');" system.out.println(\'after converted into utf-16be the string is : \'); for (int j="0;" < bytearr1.length; system.out.print(bytearr1[j]); iso latin alphabet bytearr2="str.getBytes('ISO-8859-1');" iso-8859-1 bytearr2.length; system.out.print(bytearr2[j]); little bytearr3="str.getBytes('UTF-16LE');" utf-16le bytearr3.length; system.out.print(bytearr3[j]); catch (unsupportedencodingexception g) system.out.println(\'unsupported character set\' + g); pre> <p> <strong>Output:</strong> </p> <pre> The input String is : Welcome to JavaTpoint. After converted into UTF-16 the String is : -2-10870101010809901110109010103201160111032074097011809708401120111010501100116046 After converted into UTF-16BE the String is : 0870101010809901110109010103201160111032074097011809708401120111010501100116046 After converted into ISO-8859-1 the String is : 871011089911110910132116111327497118978411211110511011646 After converted into UTF-16LE the String is : 8701010108099011101090101032011601110320740970118097084011201110105011001160460 </pre> <h2>Java String class getBytes() Method Example 4</h2> <p>The following example shows when the charset is not supported by the getBytes() method, UnsupportedEncodingException is thrown.</p> <p> <strong>FileName:</strong> StringGetBytesExample4.java</p> <pre> public class StringGetBytesExample4 { // main method public static void main(String argvs[]) { // input string String str = 'Welcome to JavaTpoint.'; System.out.println('The input String is : '); System.out.println(str + '
'); // encoding into UTF - 17 byte[] byteArr = str.getBytes('UTF-17'); System.out.println('After converted into UTF-17 the String is : '); for (int j = 0; j <bytearr.length; j++) { system.out.print(bytearr[j]); } < pre> <p> <strong>Output:</strong> </p> <pre> /StringGetBytesExample4.java:11: error: unreported exception UnsupportedEncodingException; must be caught or declared to be thrown byte[] byteArr = str.getBytes('UTF-17'); ^ 1 error </pre> <hr></bytearr.length;></pre></bytearr.length;></pre></barr.length;i++){> Java String osztály getBytes() 3. módszer példa
A következő példa a kódolást egy másik karakterkészletbe mutatja be.
Fájl név: StringGetBytesExample3.java
// Import statement import java.io.*; public class StringGetBytesExample3 { // main method public static void main(String argvs[]) { // input string String str = 'Welcome to JavaTpoint.'; System.out.println('The input String is : '); System.out.println(str + '
'); // inside try block encoding is // being done using different charsets try { 16 - bit UCS Transformation format byte[] byteArr = str.getBytes('UTF-16'); System.out.println('After converted into UTF-16 the String is : '); for (int j = 0; j <bytearr.length; 16 j++) { system.out.print(bytearr[j]); } system.out.println(\'
\'); big endian byte order, - bit ucs transformation format byte[] bytearr1="str.getBytes('UTF-16BE');" system.out.println(\'after converted into utf-16be the string is : \'); for (int j="0;" < bytearr1.length; system.out.print(bytearr1[j]); iso latin alphabet bytearr2="str.getBytes('ISO-8859-1');" iso-8859-1 bytearr2.length; system.out.print(bytearr2[j]); little bytearr3="str.getBytes('UTF-16LE');" utf-16le bytearr3.length; system.out.print(bytearr3[j]); catch (unsupportedencodingexception g) system.out.println(\'unsupported character set\' + g); pre> <p> <strong>Output:</strong> </p> <pre> The input String is : Welcome to JavaTpoint. After converted into UTF-16 the String is : -2-10870101010809901110109010103201160111032074097011809708401120111010501100116046 After converted into UTF-16BE the String is : 0870101010809901110109010103201160111032074097011809708401120111010501100116046 After converted into ISO-8859-1 the String is : 871011089911110910132116111327497118978411211110511011646 After converted into UTF-16LE the String is : 8701010108099011101090101032011601110320740970118097084011201110105011001160460 </pre> <h2>Java String class getBytes() Method Example 4</h2> <p>The following example shows when the charset is not supported by the getBytes() method, UnsupportedEncodingException is thrown.</p> <p> <strong>FileName:</strong> StringGetBytesExample4.java</p> <pre> public class StringGetBytesExample4 { // main method public static void main(String argvs[]) { // input string String str = 'Welcome to JavaTpoint.'; System.out.println('The input String is : '); System.out.println(str + '
'); // encoding into UTF - 17 byte[] byteArr = str.getBytes('UTF-17'); System.out.println('After converted into UTF-17 the String is : '); for (int j = 0; j <bytearr.length; j++) { system.out.print(bytearr[j]); } < pre> <p> <strong>Output:</strong> </p> <pre> /StringGetBytesExample4.java:11: error: unreported exception UnsupportedEncodingException; must be caught or declared to be thrown byte[] byteArr = str.getBytes('UTF-17'); ^ 1 error </pre> <hr></bytearr.length;></pre></bytearr.length;> Java String osztály getBytes() 4. módszer példa
A következő példa bemutatja, ha a karakterkészletet a getBytes() metódus nem támogatja, akkor a rendszer UnsupportedEncodingExceptiont dob fel.
csatlakozások típusai az rdbms-ben
Fájl név: StringGetBytesExample4.java
public class StringGetBytesExample4 { // main method public static void main(String argvs[]) { // input string String str = 'Welcome to JavaTpoint.'; System.out.println('The input String is : '); System.out.println(str + '
'); // encoding into UTF - 17 byte[] byteArr = str.getBytes('UTF-17'); System.out.println('After converted into UTF-17 the String is : '); for (int j = 0; j <bytearr.length; j++) { system.out.print(bytearr[j]); } < pre> <p> <strong>Output:</strong> </p> <pre> /StringGetBytesExample4.java:11: error: unreported exception UnsupportedEncodingException; must be caught or declared to be thrown byte[] byteArr = str.getBytes('UTF-17'); ^ 1 error </pre> <hr></bytearr.length;>