[英]Spring rest MultiPart file upload with Java configuration without Spring boot
我正在嘗試使用Spring配置使用MultipartFile
上傳文件的休息Web服務。 我不使用Spring Boot,我的classpath中有commons-fileupload
庫。
我讀了Spring文檔說:
你需要在web.xml中使用“multipart-config”部分標記DispatcherServlet,或者在編程Servlet注冊中使用javax.servlet.MultipartConfigElement標記,或者在自定義Servlet類的情況下使用javax.servlet.annotation.MultipartConfig標記Servlet類上的注釋...一旦使用上述方法之一啟用了Servlet 3.0多部分解析,就可以將StandardServletMultipartResolver添加到Spring配置中
因此我將這個bean添加到我的AppConfig
類:
@Bean
public StandardServletMultipartResolver multipartResolver() {
return new StandardServletMultipartResolver();
}
並使用MultipartConfig
注釋該類:
@EnableWebMvc
@MultipartConfig(maxFileSize = 5120)
public class AppConfig extends WebMvcConfigurerAdapter{
...
}
但是當我打電話給服務時,我得到了這個例外:
Caused by: org.springframework.web.multipart.MultipartException: Could not parse multipart servlet request; nested exception is java.lang.UnsupportedOperationException: SRVE8020E: Servlet does not accept multipart request
at org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.parseRequest(StandardMultipartHttpServletRequest.java:111)
at org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.<init>(StandardMultipartHttpServletRequest.java:85)
at org.springframework.web.multipart.support.StandardServletMultipartResolver.resolveMultipart(StandardServletMultipartResolver.java:76)
at org.springframework.web.multipart.support.MultipartFilter.doFilterInternal(MultipartFilter.java:112)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:207)
at [internal classes]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:207)
... 1 more
Caused by: java.lang.UnsupportedOperationException: SRVE8020E: Servlet does not accept multipart request
at com.ibm.ws.webcontainer.srt.SRTServletRequest.prepareMultipart(SRTServletRequest.java:3657)
at [internal classes]
at org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.parseRequest(StandardMultipartHttpServletRequest.java:92)
如果我使用CommonsMultipartResolver
而不是StandardServletMultipartResolver
我會得到相同的錯誤。
這是我初始化我的應用程序的方式:
public class AppInitializer implements WebApplicationInitializer {
@Override
public void onStartup(ServletContext servletContext) throws ServletException {
AnnotationConfigWebApplicationContext context = new AnnotationConfigWebApplicationContext();
context.register(AppConfig.class);
context.setServletContext(servletContext);
servletContext.addListener(new ContextLoaderListener(context));
ServletRegistration.Dynamic dispatcher = servletContext.addServlet("dispatcherServlet", new DispatcherServlet(context));
dispatcher.setLoadOnStartup(1);
dispatcher.addMapping("/");
CharacterEncodingFilter characterEncodingFilter = new CharacterEncodingFilter();
characterEncodingFilter.setEncoding("UTF-8");
characterEncodingFilter.setForceEncoding(true);
EnumSet<DispatcherType> dispatcherTypes = EnumSet.of(DispatcherType.REQUEST, DispatcherType.FORWARD);
FilterRegistration.Dynamic characterEncoding = servletContext.addFilter("CharacterEncodingFilter", characterEncodingFilter);
characterEncoding.addMappingForUrlPatterns(dispatcherTypes, true, "/*");
}
}
我也試過添加一個MultipartFilter
但沒有運氣。
MultipartFilter multipartFilter = new MultipartFilter();
FilterRegistration.Dynamic multipart = servletContext.addFilter("multipartFilter", multipartFilter);
multipart.addMappingForUrlPatterns(EnumSet.of(DispatcherType.REQUEST), true, "/*");
這有必要嗎? 我究竟做錯了什么? 我想我在整個網絡上搜索一個解決方案,但他們都使用Springpart與MultipartConfigElement
和MultipartConfigFactory
。 也許問題是我使用服務的方式?
這是我的控制器方法:
@RequestMapping(value = "/upload", method = RequestMethod.POST, consumes = "multipart/form-data" )
public Long uploadAttachment(@RequestParam("cn") String callerName, @RequestParam("cs") String callerService, @RequestParam("file") MultipartFile file)
這就是我消費它的方式:
File file = new File("C:\\Users\\cte0289\\Documents\\Email\\document.docx");
RestTemplate rest = new RestTemplate();
LinkedMultiValueMap<String, Object> map = new LinkedMultiValueMap<String, Object>();
map.add("cn", callerName);
map.add("cs", callerService);
map.add("file", file);
Long response = rest.postForObject(url + "/upload", map, Long.class);
請幫助我不知道還能做什么。
我想你可能想嘗試這樣的事情:
public class AppInitializer implements WebApplicationInitializer {
@Override
public void onStartup(ServletContext servletContext) throws ServletException {
AnnotationConfigWebApplicationContext context = new AnnotationConfigWebApplicationContext();
context.register(AppConfig.class);
context.setServletContext(servletContext);
servletContext.addListener(new ContextLoaderListener(context));
ServletRegistration.Dynamic dispatcher = servletContext.addServlet("dispatcherServlet", new DispatcherServlet(context));
dispatcher.setLoadOnStartup(1);
dispatcher.addMapping("/");
dispatcher.setMultipartConfig(getMultipartConfigElement());
CharacterEncodingFilter characterEncodingFilter = new CharacterEncodingFilter();
characterEncodingFilter.setEncoding("UTF-8");
characterEncodingFilter.setForceEncoding(true);
EnumSet<DispatcherType> dispatcherTypes = EnumSet.of(DispatcherType.REQUEST, DispatcherType.FORWARD);
FilterRegistration.Dynamic characterEncoding = servletContext.addFilter("CharacterEncodingFilter", characterEncodingFilter);
characterEncoding.addMappingForUrlPatterns(dispatcherTypes, true, "/*");
}
private MultipartConfigElement getMultipartConfigElement(){
MultipartConfigElement multipartConfigElement = new MultipartConfigElement("C:/tmp", 1024*1024*5, 1024*1024*5*5, 1024*1024);
return multipartConfigElement;
}
}
配置Spring項目以使用java配置處理文件上載的正確方法是:如果要使用Commons FileUpload庫配置它,則只需在Configuration類中包含此bean並在類路徑中添加jar
@Bean
public CommonsMultipartResolver multipartResolver(){
CommonsMultipartResolver resolver = new CommonsMultipartResolver();
resolver.setMaxUploadSize(5242880); // set the size limit
return resolver;
}
如果你想用Servlet 3.0配置項目,@ AlieneilA說你必須在調度程序servlet中設置MultipartConfig
元素:
dispatcher.setMultipartConfig(new MultipartConfigElement("C:/tmp", 1024*1024*5, 1024*1024*5*5, 1024*1024));
並在配置類中包含此bean(在我的例子中為AppConfig):
@Bean
public StandardServletMultipartResolver multipartResolver() {
return new StandardServletMultipartResolver();
}
我將文件插入LinkedMultiValueMap
的方式錯了。 我不得不使用FileSystemResource
:
File file = new File("C:\\document.doc");
RestTemplate rest = new RestTemplate();
LinkedMultiValueMap<String, Object> map = new LinkedMultiValueMap<String, Object>();
map.add("param1", param1);
map.add("param2", param2);
map.add("file", new FileSystemResource(file));
Long response = rest.postForObject(url, map, Long.class);
或者這個答案建議的MockMultipartFile
: https : MockMultipartFile
在這種情況下,包括spring mock作為依賴:
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-mock</artifactId>
<version>2.0.8</version>
</dependency>
如果有人正在為Web應用程序初始化配置擴展AbstractAnnotationConfigDispatcherServletInitializer
類,下面的簡單配置將啟用MultiPart
功能 -
import javax.servlet.MultipartConfigElement;
import javax.servlet.ServletRegistration.Dynamic;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
public class WebApplicationInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
@Override
protected Class<?>[] getRootConfigClasses() {
return null;
}
@Override
protected Class<?>[] getServletConfigClasses() {
return new Class[] { AppConfig.class };
}
@Override
protected String[] getServletMappings() {
return new String[] { "/" };
}
@Override
protected void customizeRegistration(Dynamic registration) {
MultipartConfigElement multiPart = new MultipartConfigElement("C:/temp/",
1024 * 1024 * 5, 1024 * 1024 * 10, 1024 * 1024 * 3);
registration.setMultipartConfig(multiPart);
}
}
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