Stream to String in Jdom

How to preserve white space in jdom?

i get the below error:

org.jdom.JDOMException: Error on line 1: Content is not allowed in prolog

This is my code, kindly tell the solution for this code...

import org.jdom.*;
import org.jdom.input.*;
import org.jdom.output.*;

import java.io.*;
import java.lang.*;

public class JDOM_XML_TEST {
    Document m_doc = null;
    public Element elmEHResponse = null;
    String sEHResponseXml = "";
    String sOperationType = "Edit";
    static String s_return = "";
    StringBuffer strbuffer = null;
    String sParamsXml_1 = "<VWPortal>" + "<EHResponse Type='" + "  test    CustomObject" + "' ProgLangId='" + "1" + "'>" + "<Signature>public void Item1_ButtonClick_RESP1(Context ObjContextParam, string sPortlet, string sPortletInstanceId, CILPrtlDataset objCILPrtlDataset)</Signature></EHResponse><ResultType>Result</ResultType></VWPortal>";
    //String sParamsXml ="public String   Display_Test(){"     "String s ='Welcome';"    "return s;      }";

    public static void main(String[] args) {
        JDOM_XML_TEST xml_test = new JDOM_XML_TEST();
        s_return = xml_test.getXml();
        //System.out.println("Value is:::"+s_return);   
    }

    public String getXml() {
        try {
            if (!sOperationType.equalsIgnoreCase("Delete")) {
                SAXBuilder builder = new SAXBuilder(false);
                //Commended for CustomObject
                //doc = builder.build(new ByteArrayInputStream(sParamsXml.getBytes("UTF-8")));

                //For CustomObject Alignment
                strbuffer = new StringBuffer();
                strbuffer.append("public String   Display_Test(){ \n");
         开发者_如何学JAVA       strbuffer.append("\t\t\tString s ='Welcome'; \n");
                strbuffer.append("\t\t\t return s;  \n");
                strbuffer.append("}");

                sEHResponseXml = strbuffer.toString();
                System.out.println("Value of sEHResponseXml:::" + sEHResponseXml);

                builder.setIgnoringElementContentWhitespace(true);
                m_doc = builder.build(new ByteArrayInputStream(sEHResponseXml.getBytes("UTF-8")));
                elmEHResponse = m_doc.getRootElement();

                System.out.println("Value of elmEHResponse in before:::" + elmEHResponse);
                XMLOutputter Out = new XMLOutputter();
                sEHResponseXml = Out.outputString(elmEHResponse);

                System.out.println("Value of elmEHResponse in after:::" + sEHResponseXml);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        return sEHResponseXml;
    }
}

This error is not related to preserving whitespace in your XML but some extra bytes before the start of your xml content. Use NotePad++ (or BBEdit etc) and check if there any extra characters at the start of your xml doc. Also post your XML here.

This is my code, kindly tell the solution for this code...

import org.jdom.*;
import org.jdom.input.*;
import org.jdom.output.*;

import java.io.*;
import java.lang.*;

public class JDOM_XML_TEST {
    Document m_doc = null;
    public Element elmEHResponse = null;
    String sEHResponseXml = "";
    String sOperationType = "Edit";
    static String s_return = "";
    StringBuffer strbuffer = null;
    String sParamsXml_1 = "<VWPortal>" + "<EHResponse Type='" + "  test    CustomObject" + "' ProgLangId='" + "1" + "'>" + "<Signature>public void Item1_ButtonClick_RESP1(Context ObjContextParam, string sPortlet, string sPortletInstanceId, CILPrtlDataset objCILPrtlDataset)</Signature></EHResponse><ResultType>Result</ResultType></VWPortal>";
    //String sParamsXml ="public String   Display_Test(){"     "String s ='Welcome';"    "return s;      }";

    public static void main(String[] args) {
        JDOM_XML_TEST xml_test = new JDOM_XML_TEST();
        s_return = xml_test.getXml();
        //System.out.println("Value is:::"+s_return);   
    }

    public String getXml() {
        try {
            if (!sOperationType.equalsIgnoreCase("Delete")) {
                SAXBuilder builder = new SAXBuilder(false);
                //Commended for CustomObject
                //doc = builder.build(new ByteArrayInputStream(sParamsXml.getBytes("UTF-8")));

                //For CustomObject Alignment
                strbuffer = new StringBuffer();
                strbuffer.append("public String   Display_Test(){ \n");
                strbuffer.append("\t\t\tString s ='Welcome'; \n");
                strbuffer.append("\t\t\t return s;  \n");
                strbuffer.append("}");

                sEHResponseXml = strbuffer.toString();
                System.out.println("Value of sEHResponseXml:::" + sEHResponseXml);

                builder.setIgnoringElementContentWhitespace(true);
                m_doc = builder.build(new ByteArrayInputStream(sEHResponseXml.getBytes("UTF-8")));
                elmEHResponse = m_doc.getRootElement();

                System.out.println("Value of elmEHResponse in before:::" + elmEHResponse);
                XMLOutputter Out = new XMLOutputter();
                sEHResponseXml = Out.outputString(elmEHResponse);

                System.out.println("Value of elmEHResponse in after:::" + sEHResponseXml);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        return sEHResponseXml;
    }
}

Your Problem is that in your code you are creating a StringBuffer strbuffer

            //For CustomObject Alignment
            strbuffer = new StringBuffer();
            strbuffer.append("public String   Display_Test(){ \n");
            strbuffer.append("\t\t\tString s ='Welcome'; \n");
            strbuffer.append("\t\t\t return s;  \n");
            strbuffer.append("}");

This StringBuffer has the contents

public String   Display_Test(){ 
            String s ='Welcome'; 
            return s;  
}

You are assigning that StringBuffer to the String sEHResponseXml and printing it to the console

            sEHResponseXml = strbuffer.toString();
            System.out.println("Value of sEHResponseXml:::" + sEHResponseXml);

The problem is that the String sEHResponseXml does not contain valid it XML (it is not XML at all). You then try and construct a JDOM document m_doc from this string

            builder.setIgnoringElementContentWhitespace(true);
            m_doc = builder.build(new ByteArrayInputStream(sEHResponseXml.getBytes("UTF-8")));

And this is where you program fails, telling you

org.jdom.JDOMException: Error on line 1: Content is not allowed in prolog

I re-ran your program but changed strbuffer to contain valid XML (<doc> <p> h1 </p> </doc>), here is the program below

import org.jdom.*;
import org.jdom.input.*;
import org.jdom.output.*;

import java.io.*;
import java.lang.*;

public class JDOM_XML_TEST {
    Document m_doc = null;
    public Element elmEHResponse = null;
    String sEHResponseXml = "";
    String sOperationType = "Edit";
    static String s_return = "";
    StringBuffer strbuffer = null;
    String sParamsXml_1 = "<VWPortal>" + "<EHResponse Type='" + "  test    CustomObject" + "' ProgLangId='" + "1" + "'>" + "<Signature>public void Item1_ButtonClick_RESP1(Context ObjContextParam, string sPortlet, string sPortletInstanceId, CILPrtlDataset objCILPrtlDataset)</Signature></EHResponse><ResultType>Result</ResultType></VWPortal>";
    //String sParamsXml ="public String   Display_Test(){"     "String s ='Welcome';"    "return s;      }";

    public static void main(String[] args) {
        JDOM_XML_TEST xml_test = new JDOM_XML_TEST();
        s_return = xml_test.getXml();
        //System.out.println("Value is:::"+s_return);   
    }

    public String getXml() {
        try {
            if (!sOperationType.equalsIgnoreCase("Delete")) {
                SAXBuilder builder = new SAXBuilder(false);
               //Commended for CustomObject
               //doc = builder.build(new ByteArrayInputStream(sParamsXml.getBytes("UTF-8")));

                //For CustomObject Alignment
                strbuffer = new StringBuffer();
                strbuffer.append("<doc> <p> h1 </p> </doc>");


                sEHResponseXml = strbuffer.toString();
                System.out.println("Value of sEHResponseXml:::" + sEHResponseXml);

                builder.setIgnoringElementContentWhitespace(true);
                m_doc = builder.build(new ByteArrayInputStream(sEHResponseXml.getBytes("UTF-8")));
                elmEHResponse = m_doc.getRootElement();

                System.out.println("Value of elmEHResponse in before:::" + elmEHResponse);
                XMLOutputter Out = new XMLOutputter();
                sEHResponseXml = Out.outputString(elmEHResponse);

                System.out.println("Value of elmEHResponse in after:::" + sEHResponseXml);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        return sEHResponseXml;
    }
} 

This outputs

Value of sEHResponseXml:::<doc> <p> h1 </p> </doc>
Value of elmEHResponse in before:::[Element: <doc/>]
Value of elmEHResponse in after:::<doc> <p> h1 </p> </doc>