我正在尝试将图像数据发布到seam + RESTeasy端点,并且在JBoss启动期间我遇到了一个非常神秘的错误。我发送的HTTP请求有一个内容类型的multipart / form-data,它有一个名为“attachment”的图像/ jpeg部分。我的服务方法如下:
@POST
@Path("uploadSymptomsImage/{appointmentGUID}")
@Consumes(MediaType.MULTIPART_FORM_DATA)
@Produces("application/json")
public String uploadSymptomsImage( @FormParam("attachment") InputStream fileInputStream,
@PathParam("appointmentGUID") String strAppointmentGUID )
{ ...
我得到的错误是在启动期间:
Caused by: java.lang.RuntimeException: Unable to find a constructor that takes a String param or a valueOf() or fromString() method for javax.ws.rs.FormParam("attachment") on public java.lang.String com....AppointmentRestService.uploadSymptomsImage(java.io.InputStream,java.lang.String) for basetype: java.io.InputStream
at org.jboss.resteasy.core.StringParameterInjector.initialize(StringParameterInjector.java:206) [:]
at org.jboss.resteasy.core.StringParameterInjector.<init>(StringParameterInjector.java:57) [:]
at org.jboss.resteasy.core.FormParamInjector.<init>(FormParamInjector.java:22) [:]
我的理解是媒体类型可以自动编组到InputStream。我也尝试过java.io.File,java.io.Reader - 两者都有相同的错误。当我用byte []或String替换时,我得到一个零长度数组,或者作为参数值为null。
你会如何调试这个?此外,是否可以访问原始请求或预先编组的值?
这里的任何建议都将不胜感激。
答案 0 :(得分:0)
您应该使用MultipartFormDataInput
检索内容。请参阅以下示例:
@POST
@Path("uploadSymptomsImage/{appointmentGUID}")
@Consumes(MediaType.MULTIPART_FORM_DATA)
@Produces("application/json")
public String uploadSymptomsImage(@PathParam("appointmentGUID") String strAppointmentGUID,
MultipartFormDataInput formData) {
Map<String, List<InputPart>> formDataMap = formData.getFormDataMap();
List<InputPart> attachments = formDataMap.get("attachment");
for(InputPart attachment : attachments) {
String fileName = extractFilename(attachment);
if(fileName.isEmpty()) continue;
InputStream in = attachment.getBody(new GenericType<InputStream>() {});
// Interact with stream
}
// Respond
}
extractFilename方法是一个帮助方法I wrote:
private static String extractFilename(final InputPart attachment) {
Preconditions.checkNotNull(attachment);
MultivaluedMap<String, String> headers = attachment.getHeaders();
String contentDispositionHeader = headers.getFirst("Content-Disposition");
Preconditions.checkNotNull(contentDispositionHeader);
for(String headerPart : contentDispositionHeader.split(";(\\s)+")) {
String[] split = headerPart.split("=");
if(split.length == 2 && split[0].equalsIgnoreCase("filename")) {
return split[1].replace("\"", "");
}
}
return null;
}