Java Convert formatted xml file to one line string

Question

I have a formatted XML file  and I want to convert it to one line string  how can I do that   Sample xml     lt  xml version  1 0  encoding  UTF-8   gt   lt books gt      lt book gt          lt title gt Basic XML lt  title gt          lt price gt 100 lt  price gt          lt qty gt 5 lt  qty gt      lt  book gt      lt book gt        lt title gt Basic Java lt  title gt        lt price gt 200 lt  price gt        lt qty gt 15 lt  qty gt      lt  book gt   lt  books gt    Expected output   lt  xml version  1 0  encoding  UTF-8   gt  lt books gt  lt book gt   lt title gt Basic XML lt  title gt  lt price gt 100 lt  price gt  lt qty gt 5 lt  qty gt  lt  book gt  lt book gt  lt title gt Basic Java lt  title gt  lt price gt 200 lt  price gt  lt qty gt 15 lt  qty gt  lt  book gt  lt  books gt    Thanks in advance

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Using this answer which provides the code to use Dom4j to do pretty-printing  change the line that sets the output format from  createPrettyPrint   to  createCompactFormat    public String unPrettyPrint final String xml          if  StringUtils isBlank xml             throw new RuntimeException  xml was null or blank in unPrettyPrint                 final StringWriter sw       try           final OutputFormat format   OutputFormat createCompactFormat            final org dom4j Document document   DocumentHelper parseText xml           sw   new StringWriter            final XMLWriter writer   new XMLWriter sw  format           writer write document             catch  Exception e            throw new RuntimeException  Error un-pretty printing xml  n    xml  e             return sw toString

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Open and read the file   Reader r   new BufferedReader filename   String ret       while  String s   r nextLine    null        ret  s    return ret

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I guess you want to read in  ignore the white space  and write it out again   Most XML packages have an option to ignore white space   For example  the DocumentBuilderFactory has setIgnoringElementContentWhitespace for this purpose   Similarly if you are generating the XML by marshaling an object then JAXB has JAXB FORMATTED OUTPUT

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Run it through an XSLT identity transform with  lt xsl output indent  no  gt  and  lt xsl strip-space elements      gt    lt  xml version  1 0   gt   lt xsl stylesheet version  1 0  xmlns xsl  http   www w3 org 1999 XSL Transform  gt       lt xsl output indent  no    gt       lt xsl strip-space elements      gt       lt xsl template match     node    gt           lt xsl copy gt               lt xsl apply-templates select     node     gt           lt  xsl copy gt       lt  xsl template gt   lt  xsl stylesheet gt    It will remove any of the non-significant whitespace and produce the expected output that you posted

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1  Read xml from file to StringBuilder  StringBuffer     2  call s   stringBuffer toString      3  remove all   n  and   t    s replaceAll   n        s replaceAll   t         edited   I made a small mistake  it is better to use StringBuilder in your case  I suppose you don t need thread-safe StringBuffer

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FileUtils readFileToString fileName     link

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The above solutions work if you are compressing all white space in the XML document   Other quick options are JDOM  using Format getCompactFormat    and dom4j  using OutputFormat createCompactFormat    when outputting the XML document    However  I had a unique requirement to preserve the white space contained within the element s text value and these solutions did not work as I needed   All I needed was to remove the  pretty-print  formatting added to the XML document   The solution that I came up with can be explained in the following 3-step regex process     for the sake of understanding the algorithm for the solution   String regex  updatedXml      1  remove all white space preceding a begin element tag  regex       n  s      lt         updatedXml   originalXmlStr replaceAll  regex    1         2  remove all white space following an end element tag  regex        lt   a-zA-Z0-9-          gt     s     updatedXml   updatedXml replaceAll  regex    1         3  remove all white space following an empty element tag      lt some-element xmlns attr1  some-value        gt    regex         gt     s     updatedXml   updatedXml replaceAll  regex    1       NOTE  The pseudo-code is in Java     the   1  is the replacement string which is the 1st capture group   This will simply remove the white space used when adding the  pretty-print  format to an XML document  yet preserve all other white space when it is part of the element text value

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Underscore-java library has static method U formatXml xmlstring   I am the maintainer of the project  Live example  import com github underscore lodash U  import com github underscore lodash Xml   public class MyClass       public static void main String   args            System out println U formatXml   lt a gt  n   lt b gt  lt  b gt  n   lt b gt  lt  b gt  n lt  a gt            Xml XmlStringBuilder Step COMPACT                output   lt a gt  lt b gt  lt  b gt  lt b gt  lt  b gt  lt  a gt

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In java 1 8 and above  BufferedReader br   new BufferedReader new FileReader filePath    String content   br lines   collect Collectors joining   n

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filename is filepath string BufferedReader br   new BufferedReader new FileReader new File filename     String line  StringBuilder sb   new StringBuilder     while  line br readLine      null       sb append line trim         using StringBuilder is more efficient then concat http   kaioa com node 59

[java] Java : Convert formatted xml file to one line string

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