Question

我试图将图像存储在我的数据库中，但是我收到了这个错误。我哪里错了？

JSP

<form:form class="form-horizontal" method="post"
    modelAttribute="bookForm" action="${bookActionUrl}" enctype="multipart/form-data">
    <spring:bind path="image">
        <div class="form-group ${status.error ? 'has-error' : ''}">
            <label class="col-sm-2 control-label"><th><spring:message
                        code="label.image" /></th></label>
            <div class="col-sm-10">
                <form:label for="image" path="image">Image</form:label>
                <form:input path="image" type="file" />
                <form:errors path="image" class="control-label" />
            </div>
        </div>
    </spring:bind>
</form:form>

控制器

public String saveBook(@ModelAttribute("bookForm") @Validated Book book, BindingResult result, Model model, @RequestParam CommonsMultipartFile[] image,
            final RedirectAttributes redirectAttributes) throws IOException {

    for (CommonsMultipartFile aFile : image) {
        System.out.println("Saving file: " + aFile.getOriginalFilename());
        book.setImage_name(aFile.getOriginalFilename());
        book.setImage(aFile.getBytes());
        System.out.println("Added");
    }

    if (result.hasErrors()) {
        model.addAttribute("genreList", populateDefaultModel(model));
        return "booksView/bookform";
    } else {

        redirectAttributes.addFlashAttribute("css", "success");
        if (book.isNew()) {
            // System.out.println(book.getId());
            redirectAttributes.addFlashAttribute("msg", "book added successfully!");
        } else {
            redirectAttributes.addFlashAttribute("msg", "book updated successfully!");
        }
        bookService.saveOrUpdate(book);
        // POST/REDIRECT/GET
        return "redirect:/motsach/"; // + book.getId();
    }
}

multipartResolver

@Bean(name = "multipartResolver")
public CommonsMultipartResolver getCommonsMultipartResolver() {
    CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver();
    multipartResolver.setMaxUploadSize(20971520); // 20MB
    multipartResolver.setMaxInMemorySize(1048576);  // 1MB
    return multipartResolver;
}

DAO实施

public void save(Book book) {
    // TODO Auto-generated method stub
    KeyHolder keyHolder = new GeneratedKeyHolder();

    String sql = "INSERT INTO Books(TENSACH, TACGIA, NHANXET, TINHTRANG, THELOAI, IMAGE, IMAGE_NAME) "
            + "VALUES ( :tensach, :tacgia, :nhanxet, :tinhtrang, :theloai, :image, :image_name)";

    namedParameterJdbcTemplate.update(sql, getSqlParameterByModel(book), keyHolder);
    book.setId(keyHolder.getKey().intValue());
}

模型

Integer book_ID;
String tensach;
String tacgia;
String nhanxet;
String tinhtrang;
List<String> theloai;
byte[] image;
String image_name;
String data;

错误：

无法将org.springframework.web.multipart.commons.CommonsMultipartFile类型的属性值转换为属性图像所需的类型byte []; 嵌套异常是java.lang.IllegalArgumentException：无法将org.springframework.web.multipart.commons.CommonsMultipartFile类型的值转换为属性image [0]所需的类型字节：PropertyEditor [org.springframework.beans.propertyeditors.CustomNumberEditor]返回类型为org.springframework.web的不适当值。 multipart.commons.CommonsMultipartFile`

Answer 1

谢谢大家，我已经明白了。一切都很好，但那些检查代码会导致错误。我只需删除它们就完成了！

if (result.hasErrors()) {
    model.addAttribute("genreList", populateDefaultModel(model));
    return "booksView/bookform";
} else {

将图像上传到数据库：无法转换类型的值

1 个答案: