I have the following code where I have an html template, I upload an xml file, read content of the file and I need to return a string value.

@Transactional
@Component
@RestController
public class ImportE125Controller  {
 
    @Autowired
    @Qualifier("jdbcImportE125")
    private JdbcTemplate template;    
    
    
    @PostMapping(path = "/importE125", headers="Accept=application/xml; charset=utf-8", produces = "text/plain")
    public String getE125New(@RequestParam("file") MultipartFile file, ModelMap modelMap, 
            HttpServletResponse response) throws ServletException, IOException
    {
        modelMap.addAttribute("file", file);
        String xmlString = new String (file.getBytes(), StandardCharsets.UTF_8);
        System.out.println("\n\nFILE: "  xmlString);
        Document doc = convertStringToDocument(xmlString);
        //Normalize XML structure
        doc.getDocumentElement().normalize();
        
        //Parameters
        String institutionID = null;
        String institutionName = null;
           
        int total_rows_counter = 0;
        int insertions_counter = 0;
        String cases_not_inserted = null;
        
        
             
             int insert;
             try {
                 insert = template.update("INSERT INTO tblE125Details (ForeasCode, EYear, ArProtokolou)"
                      " VALUES (?,?,?)",
                     "test", "2022", "1" );
             }
             catch (InvalidResultSetAccessException e) 
             {
                 throw new RuntimeException(e);
             } 
             catch (DataAccessException e)
             {
                 throw new RuntimeException(e);
             }
             
             total_rows_counter = total_rows_counter 1;
            
             if (insert == 1) {
                     System.out.println("\nInsert Value == "  insert);
                     insertions_counter = insertions_counter 1;
             }
             else if (insert == 0) {
                 cases_not_inserted = cases_not_inserted   "IDno: "   pINPersonInCompetentMemberState   ", ";
             }
             System.out.println("\n\nNEW\n\n");
        }
        
        
        String str = convertDocumentToString(doc);
        //return str;
        String str_response = "Response: \n"   insertions_counter   " cases added out of "    total_rows_counter;
        
        return str_response;
    }

Instead of str_response string in my browser I get the following screen:

I suppose that this controller returns an xml and not a string, even though I set public String. In case I change the headers to "text/plain" it's not working at all. I also tried consumes/produces without any luck. Any help please?

Edit:

I suppose that this controller returns an xml and not a string, even though I set public String. In case I change the headers to "text/plain" it's not working at all. I also tried consumes/produces without any luck.

This is an example that works, but returns an xml tree.

String str_response = "<response><message>"   insertions_counter   " cases added out of "    total_rows_counter "</message></response>";

CodePudding user response：

Because of this headers="Accept=application/xml; charset=utf-8", your response will have the following content type application/xml;charset=utf-8.

You browser is attempting to parse an non XML response (although the content type indicates that is XML), and therefore you receive that error.

So, your response can be a String, if it is a XML string.

If you want to return text, remove the headers or change it to

headers="Accept=text/plain;charset=UTF-8"