我收到java.util.MissingFormatArgumentException：java中的格式说明符'％s'错误

问题描述

我正在获取java.lang.RuntimeException：

java.util.MissingFormatArgumentException: Format specifier '%s' error in Java below is my stacktrace:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transformToListClass': Invocation of init method Failed; nested exception is java.lang.RuntimeException: java.util.MissingFormatArgumentException: Format specifier '%s'

Caused by: java.lang.RuntimeException: java.util.MissingFormatArgumentException: Format specifier '%s'

Caused by: java.util.MissingFormatArgumentException: Format specifier '%s'

我正在传递以下JSON文件：

{
"EcrionIntegration": {
  "HelloWord": "Hello World"
}
}

使用以下方法：

@postconstruct
public ResponseEntity<InputStreamResource> tranform() {
    try {

        JSONParser parser = new JSONParser();
//Use JSONObject for simple JSON and JSONArray for array of JSON.
        JSONObject data = (JSONObject) parser.parse(new FileReader("C:\\Liver\\code\\HELLO_WORLD.json"));//path to the JSON file.

        String payLoad = data.toString();


        ImageDescriptor descriptor = ecrionService.generateImage(payLoad,"HELLO_WORLD");

        log.info(String.format("%s generateImage Result: [%s] ",descriptor.getFileName(),descriptor.getFileUrl()));
        System.out.print(descriptor.getFileName() + " " + descriptor.getFileUrl());

        String fileName = "ecrionlList.PDF";
        log.info(String.format("file name:",fileName));
        System.out.print("file name:" + fileName);
        descriptor.setFileName(fileName);

        InputStreamResource streamResource = new InputStreamResource(descriptor.getInputStream());
        return ResponseEntity.ok()
                .contentType(MediaType.parseMediaType(MediaType.APPLICATION_PDF_VALUE))
                .body(streamResource);

    } catch (Exception ex) {
        throw new RuntimeException(ex);
    }
}

}

依次将哪种方法传递给以下方法并发送给服务器：

public ImageDescriptor generateImage(String payLoad,String templateName) {
    try {
        ImageDescriptor descriptor = new ImageDescriptor();

        String myEcrionUrl = "http://localhost:8013/v1/ecrion";
      String ecrionURL = myEcrionUrl.concat(Constant.F_SLASH).concat(templateName);



        log.info("payload" + payLoad);

        ResponseEntity<Resource> responseEntity = restTemplate.exchange(
                ecrionURL,HttpMethod.POST,ncbiService.getStringhttpentityWithPayload(payLoad),Resource.class);
      log.info(String.format("%s generateImage Result: [%s] ",responseEntity.getBody().getInputStream()));
        descriptor.setInputStream(Objects.requireNonNull(responseEntity.getBody()).getInputStream());

        convert(responseEntity.getBody().getInputStream(),"sherrr.pdf");

        log.info("file is:"+ convert(responseEntity.getBody().getInputStream(),"sherrr.pdf"));

        return descriptor;
    } catch (IOException e) {
        e.printstacktrace();
        log.error(" generate image Failed " + e.getMessage());
        throw new RuntimeException(e);
    }




 }

解决方法

log.info(String.format("%s generateImage Result: [%s] ",responseEntity.getBody().getInputStream()));

此格式有两个％s，但您仅传递了一个参数。

,

如documentation所示 String.format接受格式字符串和vararg或参数。如果查看格式化程序字符串documentation，可以看到在%符号之后，有一堆参数可用于格式化字符串。特别是对于%s，它的写法如下

's','S'    general If the argument arg is null,then the result is "null". If arg implements Formattable,then arg.formatTo is invoked. Otherwise,the result is obtained by invoking arg.toString().

所以您得到的错误是因为您告诉格式化程序字符串将格式化2个参数，并且只传递了其中一个参数

log.info(String.format("%s generateImage Result: [%s] ",responseEntity.getBody().getInputStream()));

因此您只需删除第一个%s即可：

log.info(String.format("generateImage Result: [%s] ",responseEntity.getBody().getInputStream()));