使用java spring boot时出现MultipartFormDataInput错误

Question

我使用Angular 8作为前端，Java Spring boot作为后端，在提交按钮上，表单数据以及附加在表单中的文件应该发送到服务器。但是当我点击submit按钮时，我在后端得到了一个错误，因为-

2020-01-16 10:09:20.317 ERROR 4764 --- [nio-8080-exec-2] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.IllegalStateException: No primary or default constructor found for interface org.jboss.resteasy.plugins.providers.multipart.MultipartFormDataInput] with root cause


java.lang.NoSuchMethodException: org.jboss.resteasy.plugins.providers.multipart.MultipartFormDataInput.<init>()

前端代码片段：

  createMaintenanceRequest(data: FormData): Observable<any> {
    return this.http.post(this.MAINTENANCE_URL, data,{headers: this.HEADERS})
    .map(this.extractData)
    .catch(err => this.handleError(err));
  }

后端代码片段：

    @CrossOrigin(origins = "*")
    @RequestMapping(value="/api/maintenance",method= RequestMethod.POST)
    @ResponseBody
    @Consumes(javax.ws.rs.core.MediaType.MULTIPART_FORM_DATA)
    public Response postMaintenanceRequest ( MultipartFormDataInput maintenanceData) throws IOException
    {

        System.out.println("postMaintenanceRequest - ENTER");

        MaintenanceService maintenanceService = MaintenanceService.getInstance();
        ServiceResponse serviceResponse = maintenanceService.createMaintenanceStory(maintenanceData);

        Response response;

        switch (serviceResponse.getServiceOutcome())
        {
            case SUCCESS:
                JsonObject payload = new JsonObject();
                JsonObject data = new JsonObject();
                data.addProperty("url", serviceResponse.getStoryURL());
                System.out.println("postIncident responding with story url: " + serviceResponse.getStoryURL());
                payload.add("data", data);
                response = Response.ok(payload.toString()).build();
                break;
            case INVALID_DATA:
                response = Response.status(Response.Status.BAD_REQUEST).build();
                break;
            case RALLY_ERROR:
            default:
                response = Response.serverError().build();
                break;
        }

这是我的pom.xml：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.test.hello</groupId> <!--com.test.hello.firstone-->
  <artifactId>DashboardService</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient -->
   <name>DashboardService</name>
  <description>Spring Boot base web application</description>
    <packaging>war</packaging>

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
      <version>2.1.9.RELEASE</version>
    <relativePath /> <!-- lookup parent from repository -->
  </parent>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <java.version>1.8</java.version>
      <start-class>com.test.si.main.Main</start-class>
  </properties>

<dependencies>
<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient -->
    <dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>httpclient</artifactId> 
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <!-- https://mvnrepository.com/artifact/javax.servlet/servlet-api -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>servlet-api</artifactId>
        <version>2.5</version>
        <scope>provided</scope>
    </dependency>

    <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-test</artifactId>
         <scope>test</scope>
      </dependency>
      <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-security -->
    <!-- <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-security</artifactId>
    </dependency> -->
      <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
        </dependency>
    <dependency>
        <groupId>com.google.code.gson</groupId>
        <artifactId>gson</artifactId>
    </dependency>
    <dependency>
       <groupId>com.fasterxml.jackson.core</groupId>
       <artifactId>jackson-databind</artifactId>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
    </dependency>
    <!-- https://mvnrepository.com/artifact/com.jcraft/jsch -->
    <dependency>
        <groupId>com.jcraft</groupId>
        <artifactId>jsch</artifactId>
        <version>0.1.54</version>
    </dependency>
    <dependency>
        <groupId>com.vaadin.external.google</groupId>
        <artifactId>android-json</artifactId>
        <version>0.0.20131108.vaadin1</version>
    </dependency>
    <dependency>
        <groupId>org.jasypt</groupId>
        <artifactId>jasypt</artifactId>
        <version>1.9.2</version>
    </dependency>
    <dependency>
        <groupId>javax.ws.rs</groupId>
        <artifactId>jsr311-api</artifactId>
        <version>1.1.1</version>
    </dependency>
    <dependency>
        <groupId>com.rallydev.rest</groupId>
        <artifactId>rally-rest-api</artifactId>
        <version>2.1.1</version>
    </dependency>
    <dependency>
        <groupId>org.jboss.resteasy</groupId>
        <artifactId>resteasy-multipart-provider</artifactId>
        <version>3.9.3.Final</version>
    </dependency>
</dependencies>
<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
  </build>
</project>

Answer 1

MultipartFormDataInput是resteasy (jboss) api，不能与tomcat servlet容器一起工作。要么使用spring (有人建议)，要么使用jersey one。

Answer 2

在spring中，将控制器方法更改为

@RequestMapping(value="/api/maintenance",method= RequestMethod.POST
postMaintenanceRequest(@RequestParam("file") MultipartFile file) {
.....
.....
}

在你的前面，一定要把文件放成这样

formData = new FormData();
formData.append('file', myFileData);

如果您的标题中没有授权数据，不要创建自定义标题，angular将为您创建自定义标题