通过REST服务上传文件

Question

通过REST服务上传文件

3

我希望使用restservice上传文件，我在网上找到了很多资料，但仍然无法解决我的问题。可能是因为我在Rest服务中使用了Spring？！以下是我的代码：

HTML

<input type="button" value="Upload document" id="button">
<input id="fileToUpload" type="file">

JQUERY

jQuery("document").ready(function () {
    $("#button").on("click", function () {

          var fileInput= $('input[name="fileInput"]')[0].files[0]; 
          var data = new FormData();
          data.append('file', fileInput);
          $.ajax({
            url: '.../upload',
            type: 'POST',
            data: data,
            cache: false,
            contentType: false,
            processData: false,
            success: function(data){
                alert("successfully.");
            },
            error: function(data){
                alert("failed.");
            }
          });
    });
});

JAVA（RESTSERVICE）

@RequestMapping(value = "/upload", method = { RequestMethod.POST }, produces = { MediaType.MULTIPART_FORM_DATA_VALUE,
        MediaType.APPLICATION_FORM_URLENCODED_VALUE, MediaType.APPLICATION_JSON_VALUE })
public void uploadingFile(@RequestBody InputStream uploadedInputStream) throws IOException {
    System.out.println("uploadedInputStream: " + uploadedInputStream);
}

异常

 Servlet.service() for servlet REST API Dispatcher threw exception: java.lang.IllegalStateException: Parameters processing failed.

我的REST服务没问题吧？找不到我的错误 :(

POM.XML

<!-- Spring -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
    </dependency>
    <dependency>
        <groupId>commons-fileupload</groupId>
        <artifactId>commons-fileupload</artifactId>
        <version>1.3.1</version>
    </dependency>
    <dependency>
        <groupId>commons-io</groupId>
        <artifactId>commons-io</artifactId>
        <version>2.4</version>
    </dependency>

APPLICATION-CONTEXT.XML

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd
    http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd">


<bean id="multipartResolver"
    class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <property name="maxUploadSize" value="50000000" />
</bean>

解决方案

JAVA（RESTSERVICE）

    @RequestMapping(value = "/upload", method = RequestMethod.POST)
public void uploadingFile(@RequestParam("file") MultipartFile uploadedInputStream) throws IOException {
    System.out.println("...the parameter binding works now");
}

JAVA（SPRING CONFIG）

@Bean
public static CommonsMultipartResolver multipartResolver() {
    CommonsMultipartResolver cmr = new CommonsMultipartResolver();
    cmr.setMaxUploadSize(50000000);
    return cmr;
}

（备选 - APPLICATION.XML）

    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <property name="maxUploadSize" value="50000000" />
   </bean>

- Louisa

请查看https://dev59.com/Jl8e5IYBdhLWcg3wS4-5，该网页关于Spring文件上传RESTful Web服务的问题。 - seenukarthi

嗯，我将REST服务中的参数类型从"InputStream"更改为"MultipartFile"，并且在jQuery中将内容类型从"application/x-www-form-urlencoded"更改为"multipart/form-data"。出现的异常是："java.lang.IllegalArgumentException: Expected MultipartHttpServletRequest: is a MultipartResolver configured?"。在application.xml文件中添加"<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"></bean>"并没有解决这个问题... - Louisa

你可以将contentType属性设置为false。 - nnunes10

谢谢，我已经更改了它...但仍然存在相同的问题：“java.lang.IllegalArgumentException: Expected MultipartHttpServletRequest: is a MultipartResolver configured?” - Louisa

1个回答

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- nnunes10 · Accepted Answer

您的处理程序方法应该像下面这样：

@RequestMapping(value = "/upload", method = RequestMethod.POST)
public void uploadingFile(MultipartHttpServletRequest request, HttpServletResponse response) throws IOException {

    Iterator<String> itr =  request.getFileNames();

    MultipartFile file = request.getFile(itr.next());
    System.out.println(file.getOriginalFilename() +" uploaded!");
}

不要忘记在你的应用程序上下文中添加以下行：

<mvc:annotation-driven />

<bean id="multipartResolver"
    class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <property name="maxUploadSize" value="1048576"/>
</bean>