Spring mvc 使用RestTemplate请求将多部分文件作为POST参数发送
我正在使用Spring3和RestTemplate。我基本上有两个应用程序,其中一个必须将值发布到另一个应用程序。通过rest模板 当要发布的值是字符串时,它工作得很好,但是当我必须发布混合和复杂的参数(如MultipartFiles)时,我会得到一个转换器异常 举个例子,我有: App1-后置控制器:Spring mvc 使用RestTemplate请求将多部分文件作为POST参数发送,spring-mvc,multipartform-data,resttemplate,Spring Mvc,Multipartform Data,Resttemplate,我正在使用Spring3和RestTemplate。我基本上有两个应用程序,其中一个必须将值发布到另一个应用程序。通过rest模板 当要发布的值是字符串时,它工作得很好,但是当我必须发布混合和复杂的参数(如MultipartFiles)时,我会得到一个转换器异常 举个例子,我有: App1-后置控制器: @RequestMapping(method = RequestMethod.POST) public String processSubmit(@ModelAttribute UploadDT
@RequestMapping(method = RequestMethod.POST)
public String processSubmit(@ModelAttribute UploadDTO pUploadDTO,
BindingResult pResult) throws URISyntaxException, IOException {
URI uri = new URI("http://localhost:8080/app2/file/receiver");
MultiValueMap<String, Object> mvm = new LinkedMultiValueMap<String, Object>();
mvm.add("param1", "TestParameter");
mvm.add("file", pUploadDTO.getFile()); // MultipartFile
Map result = restTemplate.postForObject(uri, mvm, Map.class);
return "redirect:postupload";
}
My application-context.xml:
<bean id="restTemplate" class="org.springframework.web.client.RestTemplate">
<property name="messageConverters">
<list>
<bean class="org.springframework.http.converter.ByteArrayHttpMessageConverter" />
<bean class="org.springframework.http.converter.FormHttpMessageConverter" />
<bean class="org.springframework.http.converter.StringHttpMessageConverter" />
<bean class="org.springframework.http.converter.xml.SourceHttpMessageConverter" />
</list>
</property>
</bean>
<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="maxUploadSize">
<value>104857600</value>
</property>
<property name="maxInMemorySize">
<value>4096</value>
</property>
</bean>
因此,我的问题是:
MultiValueMap parts=新链接的MultiValueMap();
增加(“名称1”、“价值1”);
增加(“名称2”、“值2+1”);
增加(“名称2”、“值2+2”);
Resource logo=new ClassPathResource(“/org/springframework/http/converter/logo.jpg”);
零件。添加(“徽标”,徽标);
Source xml=新的StreamSource(新的StringReader(“”);
添加(“xml”,xml);
模板。postForLocation(“http://example.com/multipart“、零件);
前几天我也遇到了同样的问题。谷歌搜索把我带到了这里和其他几个地方,但没有一个能解决这个问题。最后,我将上传的文件(MultiPartFile)保存为tmp文件,然后使用FileSystemResource通过RestTemplate上传它。这是我使用的代码
String tempFileName = "/tmp/" + multiFile.getOriginalFileName();
FileOutputStream fo = new FileOutputStream(tempFileName);
fo.write(asset.getBytes());
fo.close();
parts.add("file", new FileSystemResource(tempFileName));
String response = restTemplate.postForObject(uploadUrl, parts, String.class, authToken, path);
//clean-up
File f = new File(tempFileName);
f.delete();
我仍然在寻找一个更优雅的解决方案来解决这个问题。我们的一位同事对filesystemresource做了类似的事情。 试一试 假设您的.getFile的输出是一个java文件对象,它的工作原理应该与我们的相同,即
只有一个文件参数。解决这个问题的一种方法是使用ByteArrayResource,这样您就可以在post中发送字节数组(此代码适用于Spring 3.2.3):
MultiValueMap=newlinkedMultivaluemap();
最终字符串filename=“somefile.txt”;
添加(“名称”,文件名);
添加(“文件名”,文件名);
ByteArrayResource contentsResource=新的ByteArrayResource(content.getBytes(“UTF-8”)){
@凌驾
公共字符串getFilename(){
返回文件名;
}
};
map.add(“文件”,contentsAsResource);
String result=restemplate.postForObject(urlForFacade、map、String.class);
我重写了ByteArrayResource的getFilename,因为如果我没有,我会得到一个空指针异常(显然这取决于java activation.jar是否在类路径上,如果在类路径上,它将使用文件名来尝试确定内容类型)我最近为这个问题挣扎了3天。客户端发送请求的方式可能不是原因,服务器可能未配置为处理多部分请求。我必须这样做才能让它工作: xml-添加了commons fileupload依赖项(如果不使用依赖项管理,如maven,请下载jar并将其添加到项目中) 你的客户
public static Boolean updateStationImage(StationImage stationImage) {
if(stationImage == null) {
Log.w(TAG + ":updateStationImage", "Station Image object is null, returning.");
return null;
}
Log.d(TAG, "Uploading: " + stationImage.getImageUri());
try {
RestTemplate restTemplate = new RestTemplate();
FormHttpMessageConverter formConverter = new FormHttpMessageConverter();
formConverter.setCharset(Charset.forName("UTF8"));
restTemplate.getMessageConverters().add(formConverter);
restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter());
restTemplate.setRequestFactory(new HttpComponentsClientHttpRequestFactory());
HttpHeaders httpHeaders = new HttpHeaders();
httpHeaders.setAccept(Collections.singletonList(MediaType.parseMediaType("application/json")));
MultiValueMap<String, Object> parts = new LinkedMultiValueMap<String, Object>();
parts.add(Constants.STATION_PROFILE_IMAGE_FILE, new FileSystemResource(stationImage.getImageFile()));
parts.add(Constants.STATION_PROFILE_IMAGE_URI, stationImage.getImageUri());
parts.add(Constants.STATION_PROFILE_IMAGE_TYPE, stationImage.getImageType());
parts.add(Constants.FIELD_STATION_ID, stationImage.getStationId());
return restTemplate.postForObject(Constants.REST_CLIENT_URL_ADD_IMAGE, parts, Boolean.class);
} catch (Exception e) {
StringWriter sw = new StringWriter();
e.printStackTrace(new PrintWriter(sw));
Log.e(TAG + ":addStationImage", sw.toString());
}
return false;
}
公共静态布尔更新StationImage(StationImage StationImage){
如果(stationImage==null){
w(TAG+“:updateStationImage”,“Station Image对象为空,返回“”);
返回null;
}
Log.d(标签,“上传:”+stationImage.getImageUri());
试一试{
RestTemplate RestTemplate=新RestTemplate();
FormHttpMessageConverter formConverter=新FormHttpMessageConverter();
formConverter.setCharset(Charset.forName(“UTF8”);
restemplate.getMessageConverters().add(formConverter);
restemplate.getMessageConverters().add(新映射Jackson2HttpMessageConverter());
setRequestFactory(新的HttpComponentsClientHttpRequestFactory());
HttpHeaders HttpHeaders=新的HttpHeaders();
httpHeaders.setAccept(Collections.singletonList(MediaType.parseMediaType(“application/json”));
MultiValueMap parts=新链接的MultiValueMap();
添加(Constants.STATION\u PROFILE\u IMAGE\u文件,新文件系统资源(stationImage.getImageFile());
添加(Constants.STATION\u PROFILE\u IMAGE\u URI,stationImage.getImageUri());
添加(Constants.STATION\u PROFILE\u IMAGE\u TYPE,stationImage.getImageType());
parts.add(Constants.FIELD\u STATION\u ID,stationImage.getStationId());
返回restemplate.postForObject(Constants.REST\u CLIENT\u URL\u ADD\u IMAGE,parts,Boolean.class);
}捕获(例外e){
StringWriter sw=新的StringWriter();
e、 printStackTrace(新PrintWriter(sw));
Log.e(TAG+“:addStationImage”,sw.toString());
}
返回false;
}
这应该能奏效。我添加了尽可能多的信息,因为我花了几天的时间,拼凑了完整版本的各个部分,我希望这会有所帮助。如果您必须发送一个多部分文件,该文件由一个需要使用特定HttpMessageConverter转换的对象组成,并且您得到“没有合适的HttpMessageConverter”错误无论您尝试什么,您都可能希望尝试以下方法:
RestTemplate restTemplate = new RestTemplate();
FormHttpMessageConverter converter = new FormHttpMessageConverter();
converter.addPartConverter(new TheRequiredHttpMessageConverter());
//for example, in my case it was "new MappingJackson2HttpMessageConverter()"
restTemplate.getMessageConverters().add(converter);
这为我解决了一个自定义对象的问题,该对象与一个文件(在我的例子中是instanceof FileSystemResource)一起,是我需要发送的多部分文件的一部分。
我尝试使用的解决方案(以及在web上找到的许多其他解决方案)没有效果,然后我查看了FormHttpMessageConverter的源代码并尝试了这个方法。您必须将FormHttpMessageConverter添加到applicationContext.xml才能发布多部分文件
<bean id="restTemplate" class="org.springframework.web.client.RestTemplate">
<property name="messageConverters">
<list>
<bean class="org.springframework.http.converter.StringHttpMessageConverter" />
<bean class="org.springframework.http.converter.FormHttpMessageConverter" />
</list>
</property>
</bean>
有关示例,请参见。您可以简单地使用
multipartttpServletRequest
例如:
@RequestMapping(value={"/upload"}, method = RequestMethod.POST,produces = "text/html; charset=utf-8")
@ResponseBody
public String upload(MultipartHttpServletRequest request /*@RequestBody MultipartFile file*/){
String responseMessage = "OK";
MultipartFile file = request.getFile("file");
String param = request.getParameter("param");
try {
System.out.println(file.getOriginalFilename());
System.out.println("some param = "+param);
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(file.getInputStream(), StandardCharsets.UTF_8));
// read file
}
catch(Exception ex){
ex.printStackTrace();
responseMessage = "fail";
}
return responseMessage;
}
其中,request.getParameter()
中的参数名称必须与相应的前端名称相同
注意,该文件是通过MultiValueMap<String, Object> map = new LinkedMultiValueMap<String, Object>();
final String filename="somefile.txt";
map.add("name", filename);
map.add("filename", filename);
ByteArrayResource contentsAsResource = new ByteArrayResource(content.getBytes("UTF-8")){
@Override
public String getFilename(){
return filename;
}
};
map.add("file", contentsAsResource);
String result = restTemplate.postForObject(urlForFacade, map, String.class);
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>${commons-version}</version>
</dependency>
<filter>
<filter-name>multipartFilter</filter-name>
<filter-class>org.springframework.web.multipart.support.MultipartFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>multipartFilter</filter-name>
<url-pattern>/springrest/*</url-pattern>
</filter-mapping>
<beans:bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<beans:property name="maxUploadSize">
<beans:value>10000000</beans:value>
</beans:property>
</beans:bean>
@RequestMapping(value=Constants.REQUEST_MAPPING_ADD_IMAGE, method = RequestMethod.POST, produces = { "application/json"})
public @ResponseBody boolean saveStationImage(
@RequestParam(value = Constants.MONGO_STATION_PROFILE_IMAGE_FILE) MultipartFile file,
@RequestParam(value = Constants.MONGO_STATION_PROFILE_IMAGE_URI) String imageUri,
@RequestParam(value = Constants.MONGO_STATION_PROFILE_IMAGE_TYPE) String imageType,
@RequestParam(value = Constants.MONGO_FIELD_STATION_ID) String stationId) {
// Do something with file
// Return results
}
public static Boolean updateStationImage(StationImage stationImage) {
if(stationImage == null) {
Log.w(TAG + ":updateStationImage", "Station Image object is null, returning.");
return null;
}
Log.d(TAG, "Uploading: " + stationImage.getImageUri());
try {
RestTemplate restTemplate = new RestTemplate();
FormHttpMessageConverter formConverter = new FormHttpMessageConverter();
formConverter.setCharset(Charset.forName("UTF8"));
restTemplate.getMessageConverters().add(formConverter);
restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter());
restTemplate.setRequestFactory(new HttpComponentsClientHttpRequestFactory());
HttpHeaders httpHeaders = new HttpHeaders();
httpHeaders.setAccept(Collections.singletonList(MediaType.parseMediaType("application/json")));
MultiValueMap<String, Object> parts = new LinkedMultiValueMap<String, Object>();
parts.add(Constants.STATION_PROFILE_IMAGE_FILE, new FileSystemResource(stationImage.getImageFile()));
parts.add(Constants.STATION_PROFILE_IMAGE_URI, stationImage.getImageUri());
parts.add(Constants.STATION_PROFILE_IMAGE_TYPE, stationImage.getImageType());
parts.add(Constants.FIELD_STATION_ID, stationImage.getStationId());
return restTemplate.postForObject(Constants.REST_CLIENT_URL_ADD_IMAGE, parts, Boolean.class);
} catch (Exception e) {
StringWriter sw = new StringWriter();
e.printStackTrace(new PrintWriter(sw));
Log.e(TAG + ":addStationImage", sw.toString());
}
return false;
}
RestTemplate restTemplate = new RestTemplate();
FormHttpMessageConverter converter = new FormHttpMessageConverter();
converter.addPartConverter(new TheRequiredHttpMessageConverter());
//for example, in my case it was "new MappingJackson2HttpMessageConverter()"
restTemplate.getMessageConverters().add(converter);
<bean id="restTemplate" class="org.springframework.web.client.RestTemplate">
<property name="messageConverters">
<list>
<bean class="org.springframework.http.converter.StringHttpMessageConverter" />
<bean class="org.springframework.http.converter.FormHttpMessageConverter" />
</list>
</property>
</bean>
@RequestMapping(value={"/upload"}, method = RequestMethod.POST,produces = "text/html; charset=utf-8")
@ResponseBody
public String upload(MultipartHttpServletRequest request /*@RequestBody MultipartFile file*/){
String responseMessage = "OK";
MultipartFile file = request.getFile("file");
String param = request.getParameter("param");
try {
System.out.println(file.getOriginalFilename());
System.out.println("some param = "+param);
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(file.getInputStream(), StandardCharsets.UTF_8));
// read file
}
catch(Exception ex){
ex.printStackTrace();
responseMessage = "fail";
}
return responseMessage;
}
ByteArrayResource contentsAsResource = new ByteArrayResource(byteArr){
@Override
public String getFilename(){
return filename;
}
};
public void loadInvoices(MultipartFile invoices, String channel) throws IOException {
init();
Resource invoicesResource = invoices.getResource();
LinkedMultiValueMap<String, Object> parts = new LinkedMultiValueMap<>();
parts.add("file", invoicesResource);
HttpHeaders httpHeaders = new HttpHeaders();
httpHeaders.setContentType(MediaType.MULTIPART_FORM_DATA);
httpHeaders.set("channel", channel);
HttpEntity<LinkedMultiValueMap<String, Object>> httpEntity = new HttpEntity<>(parts, httpHeaders);
String url = String.format("%s/rest/inbound/invoices/upload", baseUrl);
restTemplate.postForEntity(url, httpEntity, JobData.class);
}