Question

我正在尝试使用struts 2实现文件上传功能。但我得到错误＆＃34; Source不能为空＆＃34;。当我调试代码时，源（上传）文件数据似乎是空。

以下是我的代码，

add_categories.jsp

<div class="container">
<div class="row">
    <section class="col-xs-12">
        <form action="addCategory" class="form-horizontal" method="post" enctype="multipart/form-data">
            <div class="form-group">
                <label for="categoryName" class="col-sm-2 control-label">Category Name</label>

                <div class="col-sm-10">
                    <input type="text" class="form-control" id="categoryName" name="categoryName"/>
                </div>
            </div>
            <div class="form-group">
                <label for="categoryDescription" class="col-sm-2 control-label">Category Description</label>

                <div class="col-sm-10">
                    <textarea id="categoryDescription" name="categoryDescription" class="form-control"></textarea>
                </div>
            </div>
            <div class="form-group">
                <label for="categoryImage" class="col-sm-2 control-label">Image</label>

                <div class="col-sm-10">
                    <input type="file" id="categoryImage" name="categoryImage" class="form-control"/>
                </div>
            </div>
            <div class="form-group">
                <div class="col-sm-10 col-sm-offset-2">
                    <input type="submit" class="btn btn-default" value="submit"/>
                </div>
            </div>
        </form>
    </section>
</div>

struts.xml中

 ?xml version="1.0" encoding="UTF-8"?><!DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
        "http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>

    <package name="admin" namespace="/admin" extends="struts-default">
        <action name="viewCategories" class="org.miraj.javabrains.actions.CategoryAction" method="viewCategories">
            <result name="success">/view_categories.jsp</result>
        </action>
        <action name="addCategories">
            <result>/add_categories.jsp</result>
        </action>

        <action name="addCategory" class="org.miraj.javabrains.actions.CategoryAction">
            <!--<interceptor-ref name="defaultStack"/>-->
            <!--<interceptor-ref name="fileUpload">-->
                <!--<param name="allowedTypes">application/ms-excel,application/vnd.ms-excel,application/vnd.openxmlformats-officedocument.spreadsheetml.sheet,image/png,image/gif,image/jpeg</param>-->
            <!--</interceptor-ref>-->
            <result name="success">/add_category_success.jsp</result>
            <result name="failure">/add_category_failure.jsp</result>
        </action>

...

CategoryAction.java

public class CategoryAction extends ActionSupport implements ModelDriven<Category> {

Category category=new Category();
private String categoryError;
ApplicationContext context=new ClassPathXmlApplicationContext("spring.xml");
AdminServices adminServices=context.getBean("adminServices",AdminServices.class);
List<Category> categories;

//file upload handling
private File categoryImage;
private String categoryImageContentType;
private String categoryImageFileName;
private String destPath;



public String execute()
{
    category.setReg_date(new Date());
    if (adminServices.category_exists(category.getCategoryName())) {

        setCategoryError("The Category already exists");
        return "failure";
    }
    else
    {
        destPath="../uploads/";
        try{


            File destFile  = new File(destPath, categoryImageFileName);
            FileUtils.copyFile(categoryImage, destFile);

        }catch(IOException e){
            e.printStackTrace();
            return "failure";
        }
        adminServices.addCategory(category);
        return "success";

    }
}

...

Category.java

package org.miraj.javabrains.models;

import javax.persistence.*;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;


@Entity
@Table (schema = "HIBERNATE")

public class Category {

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int id;
private String categoryName;
private String categoryDescription;
private String categoryImage;
private Date reg_date;
@OneToMany(mappedBy = "categoryId",cascade = CascadeType.PERSIST,fetch = FetchType.LAZY)
private Collection<Item> categoryItems=new ArrayList<Item>();



public int getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}

public String getCategoryName() {
    return categoryName;
}

public void setCategoryName(String name) {
    this.categoryName = name;
}

public String getCategoryDescription() {
    return categoryDescription;
}

public void setCategoryDescription(String description) {
    this.categoryDescription = description;
}

public Date getReg_date() {
    return reg_date;
}

public void setReg_date(Date reg_date) {
    this.reg_date = reg_date;
}

public void addCategoryItem(Item item)
{
 categoryItems.add(item);
}

public String getCategoryImage() {
    return categoryImage;
}

public void setCategoryImage(String categoryImage) {
    this.categoryImage = categoryImage;
}
}

现在，当我上传图片时，我得到了值 categoryImageContentType， categoryImageFileName

但是，categoryImage为null并导致错误。

非常感谢任何帮助。干杯

Answer 1

1。将 categoryImage 的类型从 String 更改为 File

2。我对该类型有疑问，您正用于保存类别图像。

检查数据库中“类别图像”列的类型。是 tinyblob 吗？如果是，则将其更改为 longblob ＆amp;重试保存图像。如果可能的话，也可以发布你的hibernate映射代码。

Struts2中的文件上载问题 - 源不能为空

1 个答案: