java - Spring MVC 文件上传 : Unable to process parts as no multi-part configuration has been provided

Question

我正在尝试使用 Spring MVC 和 Thymeleaf 上传文件，但出现异常，提示未提供多部分配置。

这是我的 Thymeleaf 表格:

<form action="#" th:action="@{/settings/profile}"
    th:object="${profileSettingsForm}" method="POST" enctype="multipart/form-data">
    <div class="form-group">
        <label for="profilePicture">Picture</label> <input type="file"
            th:field="*{profilePicture}" id="profilePicture" name="profilePicture">
    </div>
    <div class="form-group">
        <label for="username">Username</label> <input type="text"
            th:field="*{username}" class="form-control" id="username"
            placeholder="Type your new username">
    </div>
    <div class="form-group">
        <label for="biography">Biography</label>
        <textarea th:field="*{biography}" class="form-control" id="biography"
            rows="3" placeholder="Type your new biography"></textarea>
    </div>
    <button type="submit" class="btn btn-primary">Submit</button>
</form>

这是我的表单绑定(bind)类:

public class ProfileSettingsForm {

    private static final String NOT_BLANK_MESSAGE = "{notBlank.message}";

    private MultipartFile profilePicture;

    @NotBlank(message = ProfileSettingsForm.NOT_BLANK_MESSAGE)
    private String username;

    @NotBlank(message = ProfileSettingsForm.NOT_BLANK_MESSAGE)
    private String biography;

    public ProfileSettingsForm() {

    }

    public ProfileSettingsForm(String username, String biography) {
        this.username = username;
        this.biography = biography;
    }

    // Getters and setters

}

此外，我已经按照文档在我的 WebMvcConfig.java 中的说明配置了 Multipart 解析器，如下所示:

@Bean
public CommonsMultipartResolver multipartResolver() {
    CommonsMultipartResolver resolver = new CommonsMultipartResolver();
    resolver.setDefaultEncoding("utf-8");
    resolver.setMaxUploadSize(10000);
    return resolver;
}

为什么即使我设置了 MultiPartResolver，上传表单也不起作用？我错过了什么吗？

Answer 1

从没有找到多部分配置的异常中可以直接看出。尽管您提供了 multipartResolver bean。

问题是，在 Spring Security 过滤器之前指定 MultipartFilter 时，它会尝试获取 multipartResolver bean 但找不到它。因为它希望 bean 名称/id 为 filterMultipartResolver 而不是 multipartResolver。

帮自己一个忙。请像下面这样更改 bean 配置 -

@Bean
public CommonsMultipartResolver filterMultipartResolver() {
    CommonsMultipartResolver resolver = new CommonsMultipartResolver();
    resolver.setDefaultEncoding("utf-8");
    resolver.setMaxUploadSize(10000);
    return resolver;
}

或者

@Bean(name = "filterMultipartResolver")
public CommonsMultipartResolver multipartResolver() {
    CommonsMultipartResolver resolver = new CommonsMultipartResolver();
    resolver.setDefaultEncoding("utf-8");
    resolver.setMaxUploadSize(10000);
    return resolver;
}