Question

我正在尝试使用Spring MVC和Thymeleaf上传文件，但我得到一个例外，说没有提供多部分配置。

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

}

另外，我已按照文档在WebMvcConfig.java中的说法配置了Multipart解析器：

@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，上传表单也无法正常工作？我错过了什么吗？

Answer 1

除了没有找到多部件配置之外，它是直接的。虽然您提供了multipartResolver bean。

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

帮自己一个忙。请更改bean配置，如下所示 -

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

或

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

Answer 2

我终于修好了。对于遇到相同问题的任何人，解决方案是在我的WebAbbInitializer.java中注册多部分配置，添加此自定义方法：

private static final String LOCATION = "C:/temp/"; // Temporary location where files will be stored

private static final long MAX_FILE_SIZE = 5242880; // 5MB : Max file size.
                                                   // Beyond that size spring will throw exception.
private static final long MAX_REQUEST_SIZE = 20971520; // 20MB : Total request size containing Multi part.
private static final int FILE_SIZE_THRESHOLD = 0; // Size threshold after which files will be written to disk
private MultipartConfigElement getMultipartConfigElement() {

MultipartConfigElement multipartConfigElement = new MultipartConfigElement(
            LOCATION, MAX_FILE_SIZE, MAX_REQUEST_SIZE, FILE_SIZE_THRESHOLD);
    return multipartConfigElement;
}

最后，将其注册在同一个文件中：

@Override
protected void customizeRegistration(ServletRegistration.Dynamic registration) {
    registration.setMultipartConfig(getMultipartConfigElement());
}

您可以阅读有关here.

的更多信息

Spring MVC文件上传：由于未提供多部件配置，因此无法处理部件

2 个答案: