如何将JSON转换为Java中的XML

Question

我编写了一些Java代码，用于将JSON输入文件转换为等效的XML文件。我用了一些关于stackoverflow的其他问题的答案。但是，出现错误：

[Fatal Error] :1:123: The markup in the document following the root element must be well-formed. 
Exception in thread "main" org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 123; The markup in the document following the root element must be well-formed. 
    at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:251) 
    at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:300) 
    at TranslateJSONtoXML.stringToDom(TranslateJSONtoXML.java:34) 
    at TranslateJSONtoXML.main(TranslateJSONtoXML.java:43) 

为什么会出现此错误？我假设JSON输入格式良好。 所以，这里是代码：

import java.io.File; 
import java.io.IOException; 
import java.util.Scanner; 
import org.json.JSONObject; 
import org.json.XML; 
import java.io.*; 
import javax.xml.parsers.*; 
import org.w3c.dom.*; 
import org.xml.sax.*; 

public class TranslateJSONtoXML { 
public static String readFile(String pathname) throws IOException { 

    File file = new File(pathname); 
    StringBuilder fileContents = new StringBuilder((int)file.length()); 
    Scanner scanner = new Scanner((Readable) new BufferedReader(new FileReader(file))); 
    String lineSeparator = System.getProperty("line.separator"); 

    try { 
     while(scanner.hasNextLine()) {   
      fileContents.append(scanner.nextLine()).append(lineSeparator); 
     } 
     return fileContents.toString(); 
    } finally { 
     scanner.close(); 
    } 
} 

public static Document stringToDom(String xmlSource) 
     throws SAXException, ParserConfigurationException, IOException { 
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); 
    DocumentBuilder builder = factory.newDocumentBuilder(); 
    return builder.parse(new InputSource(new StringReader(xmlSource))); 
} 

public static void main(String[] args) 
     throws SAXException, ParserConfigurationException, IOException { 
    String jsonString = readFile("/Users/monicamarcus/Downloads/Attachments_20131023/edl.json"); 
    JSONObject o = new JSONObject(jsonString); 
    String xml = org.json.XML.toString(o); 
    System.out.println(xml); 
    Document doc = stringToDom(xml); 

    System.out.println(doc.getDocumentURI()); 
} 

} 

这个错误来自行返回builder.parse（新的InputSource（新StringReader（xmlSource）））;

这是我得到的XML。这显然不是良好的，但我不知道为什么我得到这样的：

<javascript>function textCounterEval(e,t){var n=t;var r=n.length;if(r&gt;=e){return true}else{return false}}</javascript> 
<title>Request Conversion</title> 
<configParams>param1</configParams> 
<configParams>param2</configParams> 
<instructions>** Fields with an asterisk are required.</instructions> 
<name>RequestJSON.eDoc.Form</name> 
<createInstructions>** Fields with an asterisk are required.</createInstructions> 
<eventNotificationURL>http://localhost:8080/xx-xxx/xxx.jsp</eventNotificationURL> 
<fieldDefs> 
    <attributeName>RequestChange.eDoc.isUrgent.RuleAttribute</attributeName> 
    <title>URGENT</title> 
    <validation><message>Please Select a Campus.</message> 
    <customValidator>function addEvent(e,t,n,r){if(e.addEventListener){e.addEventListener(t,n,r);return true}else if(e.attachEvent){var i=e.attachEvent(&apos;on&apos;+t,n);return i}else{e[&apos;on&apos;+t]=n}}</customValidator> 
<regex>[^Select]</regex> 
<required>true</required> 
    </validation><name>isUrgent</name> 
    <value>no</value> 
    <display> 
     <values> 
      <title>--- Select ---</title> 
     </values> 
     <values> 
      <title>Group1</title> 
      <value>sampleGroup1</value> 
     </values> 
     <values> 
      <title>Group2</title> 
      <value>sampleGroup2</value> 
     </values> 
    <valuesGroup> 
     <values> 
      <title>NO</title> 
      <value>NO</value> 
     </values> 
     <values> 
      <title>YES</title> 
      <value>YES</value> 
     </values> 
    <dependsOn> 
     <field> 
      <name>abc</name> 
      <value>XYZ</value> 
     </field> 
    </dependsOn> 
    </valuesGroup> 
     <type>select</type> 
     <meta> 
      <name>cols</name> 
      <value>60</value> 
     </meta> 
</display> 
    <lookup> 
     <fieldConversions>conversions</fieldConversions> 
     <businessObjectClassName>org.xxx.xxxx</businessObjectClassName> 
    </lookup> 
    </fieldDefs> 
    <fieldDefs> 
    <title>Date and Time for Change: MM/DD/YYYY</title> 
    <validation> 
    <message>Enter a valid date in the format mm/dd/yyyy.</message> 
    <regex>^[0-1]?[0-9](/|-)[0-3]?[0-9](/|-)[1-2][0-9][0-9][0-9]$</regex> 
    <required>true</required> 
    </validation> 
     <name>dateOfChange</name> 
     <display> 
     <type>text</type> 
     </display> 
    </fieldDefs> 
    <fieldDefs> 
    <title>Description of the Change</title> 
    <validation> 
     <message>Enter a description of the change.</message> 
     <required>true</required> 
    </validation> 
     <name>descriptionOfChange</name> 
     <display> 
      <type>textarea</type> 
      <meta> 
       <name>rows</name> 
       <value>5</value> 
      </meta> 
      <meta> 
       <name>cols</name> 
       <value>60</value> 
      </meta> 
     </display> 
    </fieldDefs>< 
     validations> 
      <message>If Request is OTHER, please enter Other Request.</message> 
      <expression>(wf:field(&apos;reason&apos;) = &apos;Other&apos; and 
    not(wf:empty(wf:field(&apos;otherDescription&apos;)))) or (wf:field(&apos;reason&apos;) != 
    &apos;Other&apos; and wf:empty(wf:field(&apos;otherDescription&apos;))) 
      </expression> 
     </validations> 
      <attributes> 
       <name>NetworkIdRole1Attribute</name> 
       <fields> 
       <attributeField>user1Id</attributeField> 
       <edlField>RoleAdHoc</edlField> 
       </fields> 
     </attributes> 
     <attributes> 
       <name>NetworkIdRole2Attribute</name> 
       <fields> 
        <attributeField>user2Id</attributeField> 
        <edlField>RoleAdHoc</edlField> 
       </fields> 
     </attributes> 
    <security>Defines security for the edl document 
    </security> 

我还张贴JSON文件。不过，它看起来很完美。

{ 
    "name": "RequestJSON.eDoc.Form", 
    "title": "Request Conversion", 
    "configParams": [ 
     "param1", 
     "param2" 
    ], 
    "security": "Defines security for the edl document", 
    "eventNotificationURL": "http://localhost:8080/xx-xxx/xxx.jsp", 
    "createInstructions": "** Fields with an asterisk are required.", 
    "instructions": "** Fields with an asterisk are required.", 
    "validations": [ 
     { 
      "expression": "(wf:field('reason') = 'Other' and not(wf:empty(wf:field('otherDescription')))) or (wf:field('reason') != 'Other' and wf:empty(wf:field('otherDescription')))", 
     "message": "If Request is OTHER, please enter Other Request." 
     } 
       ], 
    "attributes": [ 
     { 
      "name": "NetworkIdRole1Attribute", 
      "fields": [ 
       { 
        "attributeField": "user1Id", 
        "edlField": "RoleAdHoc" 
       } 
      ] 
     }, 
     { 
      "name": "NetworkIdRole2Attribute", 
      "fields": [ 
       { 
        "attributeField": "user2Id", 
        "edlField": "RoleAdHoc" 
       } 
      ] 
     } 
    ], 
    "javascript": "function textCounterEval(e,t){var n=t;var r=n.length;if(r>=e){return true}else{return false}}", 
    "fieldDefs": [ 
     { 
      "attributeName": "RequestChange.eDoc.isUrgent.RuleAttribute", 
      "name": "isUrgent", 
      "title": "URGENT", 
      "value": "no", 
      "display": { 
       "type": "select", 
       "meta": [ 
        { 
         "name": "cols", 
         "value": "60" 
        } 
       ], 
       "values": [ 
        { 
         "title": "--- Select ---" 
        }, 
        { 
         "title": "Group1", 
         "value": "sampleGroup1" 
        }, 
        { 
         "title": "Group2", 
         "value": "sampleGroup2" 
        } 
       ], 
       "valuesGroup": { 
        "dependsOn": { 
         "field": { 
          "name": "abc", 
          "value": "XYZ" 
         } 
        }, 
        "values": [ 
         { 
          "title": "NO", 
          "value": "NO" 
         }, 
         { 
          "title": "YES", 
          "value": "YES" 
         } 
        ] 
       } 
      }, 
      "lookup": { 
       "businessObjectClassName": "org.xxx.xxxx", 
       "fieldConversions": "conversions" 
      }, 
      "validation": { 
       "required": "true", 
       "regex": "[^Select]", 
       "customValidator": "function addEvent(e,t,n,r){if(e.addEventListener){e.addEventListener(t,n,r);return true}else if(e.attachEvent){var i=e.attachEvent('on'+t,n);return i}else{e['on'+t]=n}}", 
       "message": "Please Select a Campus." 
      } 
     }, 
     { 
      "name": "dateOfChange", 
      "title": "Date and Time for Change: MM/DD/YYYY", 
      "display": { 
       "type": "text" 
      }, 
      "validation": { 
       "required": "true", 
       "regex": "^[0-1]?[0-9](/|-)[0-3]?[0-9](/|-)[1-2][0-9][0-9][0-9]$", 
       "message": "Enter a valid date in the format mm/dd/yyyy." 
      } 
     }, 
     { 
      "name": "descriptionOfChange", 
      "title": "Description of the Change", 
      "display": { 
       "type": "textarea", 
       "meta": [ 
        { 
         "name": "rows", 
         "value": "5" 
        }, 
        { 
         "name": "cols", 
         "value": "60" 
        } 
       ] 
      }, 
      "validation": { 
       "required": "true", 
       "message": "Enter a description of the change." 
      } 
     } 
    ] 
} 

Answer 1

首先，你XMLified JSON对象不包含XML头<?xml version="1.0"?>和第二你的XML作为我的第一个评论已经指出内有一个以上的根元素。最简单的解决办法是手动添加它们像这样：

StringBuilder builder = new StringBuilder(); 
builder 
    .append("<?xml version=\"1.0\"?>") 
    .append("<yourJsonToXmlRootElement>") 
    .append(xml) 
    .append("</yourJsonToXmlRootElement>"); 
xml = builder.toString(); 

然后用xml与stringToDom功能。

但请注意，可能还有其他错误，我还没有检查。