在spring mvc中从ajax调用jasperreport时出现解析器错误

Posted 2023-05-08

【中文标题】在spring mvc中从ajax调用jasperreport时出现解析器错误

【英文标题】：parsererror when calling jasperreport from ajax in spring mvc

【发布时间】：2020-12-22 19:59:31

【问题描述】：

我正在从 jquery ajax 调用端点以使用 spring mvc 生成 jasperreport，我想在新的浏览器选项卡中以 pdf 格式查看生成的报告。 问题是我收到报告解析器错误，从文本到应用程序/pdf 错误返回到 ajax 的转换失败，如果我从浏览器调试请求，我会看到响应中获得的 pdf 文本

这里是调用spring mvc方法的Ajax代码

var developerData = ;
        developerData["from"] = $("#productivity_dateTimeFrom").val();
        developerData["to"] = $("#productivity_dateTimeTo").val();
        $.ajax(
            type : "POST",
            contentType : "application/json; charset=utf-8",
            url : 'Productivity',
            data : JSON.stringify(developerData),
            dataType : 'application/pdf',
            success : function(data)                   
                window.open(data.fileUrl);
            ,
            error : function(request,status,error)
                alert(request)
                alert(status)
                alert(error)
            
        );

要从 ajax 调用的 Spring mvc 方法：

@RequestMapping(value = "/Productivity", method = RequestMethod.POST, produces ="application/pdf")
@ResponseBody
public ResponseEntity<byte[]> runReport(@RequestBody String object) throws IOException, JRException 

    db_con db_con = new db_con();
    Resource resource = new ClassPathResource("Productivity.jasper");
    InputStream jasperStream = null;
    Gson g = new Gson();
    try 
        jasperStream = resource.getInputStream();
     catch (IOException e1) 
        // TODO Auto-generated catch block
        e1.printStackTrace();
    

    DateTimeRange p = g.fromJson(object, DateTimeRange.class);
    Map<String, Object> params = new HashMap<String, Object>();
    params.put("p_from_date",dateUtils.convertStringToTimestamp(p.getFrom().replace("T", " ")+":00.000"));
    params.put("p_to_date",dateUtils.convertStringToTimestamp(p.getTo().replace("T", " ")+":00.000"));
    params.put("username", "admin");
    params.put("p2", 1L);
    params.put("p3", "All");
    JasperReport jasperReport = null;

    try 
        jasperReport = (JasperReport) JRLoader.loadObject(jasperStream);
     catch (JRException e) 
        // TODO Auto-generated catch block
        e.printStackTrace();
    

    Connection rep_connection = null;

    try 
        rep_connection = db_con.get_connection();
     catch (ClassNotFoundException e) 
        // TODO Auto-generated catch block
        e.printStackTrace();
    
    
    JasperPrint jasperPrint = null;
    try 
        jasperPrint = JasperFillManager.fillReport(jasperReport, params, rep_connection);
     catch (JRException e) 
        // TODO Auto-generated catch block
        e.printStackTrace();
    
    
    final ByteArrayOutputStream outStream = new ByteArrayOutputStream();
    
    try 
        JasperExportManager.exportReportToPdfStream(jasperPrint, outStream);
     catch (JRException e) 
        // TODO Auto-generated catch block
        e.printStackTrace();
    

    HttpHeaders headers = new HttpHeaders();

    headers.setContentType(MediaType.APPLICATION_PDF);
    String filename = "report.pdf";

    headers.add("content-disposition", "inline;filename=" + filename);

    return new ResponseEntity<>(outStream.toByteArray(), headers, HttpStatus.OK);

【参考方案1】：

尝试将 pdf 下载为 blob 并使用 blob url 进行查看

    $.ajax(
        type : "POST",
        contentType : "application/json; charset=utf-8",
        url : 'Productivity',
        data : JSON.stringify(developerData),
        xhrFields:
            responseType: 'blob'
        ,
        success : function(data)                   
            window.open(URL.createObjectURL(data));
        ,
        error : function(request,status,error)
            alert(request)
            alert(status)
            alert(error)
        
    );

【讨论】：

控制器方法是真的吗？