我有下面的代码，我有一个html模板，我上传了一个xml文件，读取文件的内容，我需要返回一个字符串值。

@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;
    }

而不是str_response字符串在我的浏览器中，我得到以下屏幕：

我想这个控制器返回一个xml而不是一个字符串，即使我设置了public String。如果我把头改为"text/plain"，它根本不工作。我也试过consumes/produces，但没有任何运气。请帮助我吗？

• • 编辑：**

我假设这个控制器返回一个xml而不是一个字符串，即使我设置了public String。如果我把头改为"text/plain"，它根本不起作用。我也尝试了consumes/produces，但没有任何运气。
这是一个可以工作的示例，但返回的是一个XML树。

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