我有一个带有图像的数据提交表单。但是，当我单击“提交”按钮时，出现以下错误：
org.springframework.validation.BindException：org.springframework.validation.BeanPropertyBindingResult：1个错误 字段“ fileData”上对象“员工”的字段错误：拒绝的值[org.springframework.web.multipart.support.StandardMultipartHttpServletRequest$StandardMultipartFile@25d17d23]；代码[typeMismatch.employee.fileData，typeMismatch.fileData，typeMismatch.org.springframework.web.multipart.commons.CommonsMultipartFile，typeMismatch]；参数[org.springframework.context.support.DefaultMessageSourceResolvable：代码[employee.fileData，fileData];参数[];默认消息[fileData]]；默认消息[未能将类型'org.springframework.web.multipart.support.StandardMultipartHttpServletRequest $ StandardMultipartFile'的属性值转换为属性'fileData'所需的类型'org.springframework.web.multipart.commons.CommonsMultipartFile'；嵌套异常为java.lang.IllegalStateException：无法将类型“ org.springframework.web.multipart.support.StandardMultipartHttpServletRequest $ StandardMultipartFile”的值转换为属性“ fileData”的所需类型“ org.springframework.web.multipart.commons.CommonsMultipartFile” ：找不到匹配的编辑器或转换策略]
我正在使用Spring Boot，并且执行了以下操作：
application.properties
# multipart
multipart.enabled=true
spring.http.multipart.max-file-size=500000KB
spring.http.multipart.max-request-size=500000KB
我的GET和POST方法的处理方式如下：
@GetMapping("/add-employee")
public ModelAndView empAdmin(Model model) {
Employee employee=new Employee();
model.addAttribute("employee", employee);
return new ModelAndView("add-new-employee");
}
// POST: Save product
@RequestMapping(value = { "/add-employee" }, method = RequestMethod.POST)
public String productSave(@ModelAttribute("employee") Employee employee)
{
employeeService.saveEmployee(employee);
return "redirect:/add-employee";
}
我的服务类别是：
import com.ashwin.vemployee.model.Employee;
import com.ashwin.vemployee.repository.EmployeeRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class EmployeeService {
@Autowired
private EmployeeRepository empRepository;
public Employee saveEmployee(Employee employee){
byte[] image = employee.getFileData().getBytes();
if (image != null && image.length > 0) {
employee.setImage(image);
}
if(employee.getiNumber()==null){
empRepository.save(employee);
}
else{
empRepository.save(employee);
}
return employee;
}
}
我的add-new-employee.jsp如下：
<form:form modelAttribute="employee" method="POST" enctype="multipart/form-data">
<label>iNumber</label>
<form:input path="iNumber" id="iNumber" type="text" class="form-control" required="required" />
<label>Full Name:</label>
<form:input path="fullName" id="fullName" type="text" class="form-control" required="required" />
<label>Joined Date</label>
<form:input path="joinedDate" id="joinedDate" type="text" class="form-control" required="required" />
<label>Position</label>
<form:input path="position" id="position" type="text" class="form-control" required="required" />
<label>Reports To</label>
<form:input path="reportsTo" id="reportsTo" type="text" class="form-control" required="required" />
<label>Cubicle No</label>
<form:input path="cubicleNo" id="cubicleNo" type="text" class="form-control" required="required" />
<label>Job type</label>
<form:input path="jobType" id="jobType" type="text" class="form-control" required="required" />
<td>Upload Image</td>
<td>
<form:input type="file" path="fileData" />
</td>
<td> </td>
<input type="submit" value="Submit" />
<input type="reset" value="Reset" />
</form:form>
为处理上传文件选项，我添加了<form:input type="file" path="fileData" />。
我的模型类如下Employee.java.
import org.springframework.web.multipart.commons.CommonsMultipartFile;
import javax.persistence.*;
import javax.validation.constraints.NotBlank;
import java.util.Date;
@Entity
@Table(name = "employee")
public class Employee {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
@NotBlank
private String iNumber;
@NotBlank
private String fullName;
// @NotBlank
private String joinedDate;
@NotBlank
private String position;
@NotBlank
private String reportsTo;
@NotBlank
private String cubicleNo;
@NotBlank
private String jobType;
@Lob
@Column(name = "Image", length = Integer.MAX_VALUE, nullable = true)
private byte[] image;
// Upload file.
//@Transient
private CommonsMultipartFile fileData;
//all default construcotr and getters and setters
我在pom.xml中添加了新的依赖项。
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.2.1</version>
</dependency>
我的整个pom.xml看起来像这样：
<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.1.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.ashwin</groupId>
<artifactId>vemployee</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>vemployee</name>
<description>Demo project for Spring Boot for offc</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<!-- https://mvnrepository.com/artifact/jstl/jstl -->
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!-- needed for jsp -->
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<version>9.0.27</version>
</dependency>
<!--bootsrap and jquery-->
<dependency>
<groupId>org.webjars</groupId>
<artifactId>bootstrap</artifactId>
<version>4.3.1</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>jquery</artifactId>
<version>3.4.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.webjars/bootstrap-datepicker -->
<dependency>
<groupId>org.webjars</groupId>
<artifactId>bootstrap-datepicker</artifactId>
<version>1.7.1</version>
</dependency>
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.2.1</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
为什么我会收到此错误？
答案 0 :(得分：2)
如果有图像数据，可以在下面尝试获取请求部分。
// POST: Save product
@RequestMapping(value = { "/add-employee" }, method = RequestMethod.POST, consumes = {"multipart/form-data"})
public String productSave(@ModelAttribute("employee") Employee employee, @RequestPart("file") MultipartFile file)
{
employeeService.saveEmployee(employee);
return "redirect:/add-employee";
}
另一种解决方案是对图像进行64位编码并作为字符串发送，然后在服务层对其进行解码。
答案 1 :(得分：0)
您不应在班级中将多部分文件称为CommonsMultipartFile，而只是MultiPartFile