How can I define a JAX-RS service that processes multi-part data in JEE?(如何在 JEE 中定义处理多部分数据的 JAX-RS 服务?)

本文介绍了如何在 JEE 中定义处理多部分数据的 JAX-RS 服务?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

这是我目前所拥有的:

这会初始化我的 REST 服务

package com.dothatapp.web.rest;

import javax.servlet.annotation.MultipartConfig;
import javax.ws.rs.ApplicationPath;
import javax.ws.rs.core.Application;

@ApplicationPath("/authed/rest")
public class JaxRsActivator extends Application {
}

这就是我的服务的样子:

import javax.servlet.http.HttpServletRequest;
import javax.ws.rs.Consumes;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.UriInfo;

import org.json.JSONObject;

@Path("fileupload")
public class FileUpload {

    @Context
    private UriInfo context;

    @POST
    @Consumes(MediaType.MULTIPART_FORM_DATA)
    @Produces(MediaType.APPLICATION_JSON)
    public JSONObject doUpload(@Context HttpServletRequest obj) {
        try {
            obj.getParts();
        } catch (Exception e) {
            e.printStackTrace();
        } 
        System.out.println(us);
        System.out.println(es);
        System.out.println(obj);
        return null;
    }
}

我尝试将 @MultipartConfig 添加到 JaxRsActivator，但仍然收到异常:Request.getParts is called without multipart configuration.将 @MultipartConfig 添加到 servlet，或将 multipart-config 元素添加到 web.xml.

I tried adding @MultipartConfig to JaxRsActivator, but I still get an Exception: Request.getParts is called without multipart configuration. Either add a @MultipartConfig to the servlet, or a multipart-config element to web.xml. 

3-12-08T17:03:05.013+0000|SEVERE: java.lang.IllegalStateException: Request.getParts is called without multipart configuration. Either add a @MultipartConfig to the servlet, or a multipart-config element to web.xml
    at org.apache.catalina.connector.Request.checkMultipartConfiguration(Request.java:4522)
    at org.apache.catalina.connector.Request.getParts(Request.java:4528)
    at org.apache.catalina.connector.RequestFacade.getParts(RequestFacade.java:1086)
    at com.dothatapp.web.rest.FileUpload.doUpload(FileUpload.java:36)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory$1.invoke(ResourceMethodInvocationHandlerFactory.java:81)
    at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:125)
    at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$TypeOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:195)
    at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:91)
    at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:346)
    at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:341)
    at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:101)
    at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:224)
    at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271)
    at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:267)
    at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317)
    at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:198)
    at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:946)
    at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:323)
    at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:372)
    at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:335)
    at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:218)
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:344)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
    at com.dothatapp.web.filter.DoThatAppFilter.doFilter(DoThatAppFilter.java:27)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
    at com.dothatapp.web.filter.AuthFilter.doFilter(AuthFilter.java:113)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:316)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)
    at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174)
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:357)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:260)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:188)
    at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:191)
    at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:168)
    at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:189)
    at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:288)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:206)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:136)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:114)
    at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
    at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:838)
    at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:113)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:115)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:55)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:135)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:564)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:544)
    at java.lang.Thread.run(Thread.java:724)

谢谢

推荐答案

最后我设法在没有 Jersey 耦合的情况下完成了这个工作.问题是 @Multipart 注释不适用于 Application，因此您需要在 web.xml 和 Application 中定义它类定义提供的服务.在服务内部，您可以正常使用注释.另请注意，我正在从请求中提取 Parts，但这很容易.

Finally I managed to get this working by without Jersey coupling. The problem is that @Multipart annotation doesn't work with the Application, so you need to define it inside web.xml and inside the Application class define the provided service. Inside the services you can use annotations normally. Also note, that I am extracting the Parts from the request, but this is very easy.

PS.这实际上实现了 bluimp JQuery 文件上传

PS. This actually implements the back-end for bluimp JQuery file upload

web.xml

<servlet>
    <servlet-name>com.web.rest.JaxRsActivator</servlet-name>
    <multipart-config>
        <location>c:dotmp</location>
        <max-file-size>35000000</max-file-size>
        <max-request-size>218018841</max-request-size>
        <file-size-threshold>0</file-size-threshold>
    </multipart-config>
</servlet>
<servlet-mapping>
    <servlet-name>com.dothatapp.web.rest.JaxRsActivator</servlet-name>
    <url-pattern>/rest/*</url-pattern>
</servlet-mapping>

JaxRsActivator.java

    import java.util.HashSet;
    import java.util.Set;

    import javax.ws.rs.core.Application;

    public class JaxRsActivator extends Application {
          @Override
            public Set<Class<?>> getClasses() {
                Set<Class<?>> s = new HashSet<Class<?>>();
                s.add(FileUpload.class);
                return s;
            }
    }

文件上传.java

import java.io.IOException;

import javax.json.Json;
import javax.json.JsonArrayBuilder;
import javax.json.JsonObject;
import javax.json.JsonObjectBuilder;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.Part;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;

@Path("/")
public class FileUpload {

    @POST
    @Produces(MediaType.APPLICATION_JSON)
    @Path("fileupload")
    public Response doUpload(@Context HttpServletRequest request) {
        JsonArrayBuilder array = Json.createArrayBuilder();

        try {
            for (Part part : request.getParts()) {
                String name = null;
                long size = 0;
                try {
                    if (part.getContentType() == null
                            || !part.getContentType().toLowerCase()
                                    .startsWith("image/"))
                        continue;

                    name = part.getSubmittedFileName();
                    size = part.getSize();

                    array.add(addFile(name, size, "anId"));
                    part.delete();
                } catch (Exception e) {
                    array.add(addError(name, size, "ERROR"));
                }
            }
        } catch (IOException | ServletException e) {
            e.printStackTrace();
        }

        JsonObject ret = Json.createObjectBuilder().add("files", array).build();
        return Response.status(201).entity(ret).build();
    }

    private JsonObjectBuilder addFile(String name, long size, String url) {
        return Json.createObjectBuilder().add("name", name).add("size", size)
                .add("lid", url);
    }

    private JsonObjectBuilder addError(String name, long size, String error) {
        return Json.createObjectBuilder().add("name", name).add("size", size)
                .add("error", error);
    }

}

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