9.上传文件-白红宇

9.上传文件

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发布时间：2019-06-29

本文共 5767 字，大约阅读时间需要 19 分钟。

1.客户端编程

为了上传文件，必须将HTML表格的enctype属性值设为multipart/form-data,


     
       Select a file 
       
       4

如果想上传多个文件，必须使用多个文件input元素

2.MultipartFile接口

在SpringMVC中处理已经上传的文件十分容易，上传到SpringMVC应用程序中的文件

会被包在一个MultipartFile对象中，你唯一的任务就是用类型为MultipartFile的属性编写一个

domain类

3.用Commons FileUpload上传文件

需要将两个jar文件复制到应用程序的WEB-INF/lib目录下，

commons-fileupload-x.y.jar

commons-io-x.y.jar

此外还需要在SpringMVC的配置文件中定义multipartResolver bean

4.Domain类

1 package app11a.domain; 2 import java.io.Serializable; 3 import java.util.List; 4  5 import javax.validation.constraints.NotNull; 6 import javax.validation.constraints.Size; 7 import org.springframework.web.multipart.MultipartFile; 8  9 public class Product implements Serializable {10     private static final long serialVersionUID = 74458L;11 12     @NotNull13     @Size(min=1, max=10)14     private String name;15 16     private String description;17     private Float price;18     private List
     
       images;19 20     public String getName() {21         return name;22     }23     public void setName(String name) {24         this.name = name;25     }26     public String getDescription() {27         return description;28     }29     public void setDescription(String description) {30         this.description = description;31     }32     public Float getPrice() {33         return price;34     }35     public void setPrice(Float price) {36         this.price = price;37     }38     public List
      
        getImages() {39         return images;40     }41     public void setImages(List
       
         images) {42         this.images = images;43     }44 }

5.控制器

1 package app11a.controller; 2  3 import java.io.File; 4 import java.io.IOException; 5 import java.util.ArrayList; 6 import java.util.List; 7  8 import javax.servlet.http.HttpServletRequest; 9 10 import org.apache.commons.logging.Log;11 import org.apache.commons.logging.LogFactory;12 import org.springframework.stereotype.Controller;13 import org.springframework.ui.Model;14 import org.springframework.validation.BindingResult;15 import org.springframework.web.bind.annotation.ModelAttribute;16 import org.springframework.web.bind.annotation.RequestMapping;17 import org.springframework.web.multipart.MultipartFile;18 19 import app11a.domain.Product;20 21 @Controller22 public class ProductController {23 24     private static final Log logger = LogFactory25             .getLog(ProductController.class);26 27     @RequestMapping(value = "/product_input")28     public String inputProduct(Model model) {29         model.addAttribute("product", new Product());30         return "ProductForm";31     }32 33     @RequestMapping(value = "/product_save")34     public String saveProduct(HttpServletRequest servletRequest,35             @ModelAttribute Product product, BindingResult bindingResult,36             Model model) {37 38         List
     
       files = product.getImages();39 40         List
      
        fileNames = new ArrayList
       
        ();41 42         if (null != files && files.size() > 0) {43             for (MultipartFile multipartFile : files) {44 45                 String fileName = multipartFile.getOriginalFilename();46                 fileNames.add(fileName);47 48                 File imageFile = new File(servletRequest.getServletContext()49                         .getRealPath("/image"), fileName);50                 try {51                     multipartFile.transferTo(imageFile);52                 } catch (IOException e) {53                     e.printStackTrace();54                 }55             }56         }57 58         // save product here59         model.addAttribute("product", product);60         return "ProductDetails";61     }62 63 }

保存上传文件只需MultipartFile.transferTo（）方法

6.配置文件

maxUploadSize:接受最大容量 7.JSP页面 ProductForm.jsp

1 <%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %> 2 <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> 3  4  5  6 Add Product Form 7  8  9 10 11 
     
      12 
      
       13     
       
        14         
        Add a product15         
        16             Product Name: 17             
         18             
         19         
20         
        21             Description: 22             
         23         
24         
        25             Price: 26             
         27         
28         
        29             Product Image: 30             31         
32         
        33             34             36         
37     
       
38 
      39 
     
40 41

ProductDetil.jsp

1 <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> 2  3  4  5 Save Product 6  7  8  9 
     
      10     
      The product has been saved.
11     
      12         
      Details:
13         Product Name: ${product.name}
      
14         Description: ${product.description}
      
15         Price: $${product.price}16         
      Following files are uploaded successfully.
17         
      
       18         
       
        19             
        ${image.originalFilename}20             21             ${image.originalFilename}"/>22             
23         
       24         
      
25     
      
26 
     
27 28