java中使用Struts 2框架上传文件代码

	  

		
 代码如下
		
复制代码
	  
	  

		
<form action="" enctype="application/x-www-form-urlencoded" method="get">
      ...
form>

	  
	要使用HTML表单上传文件，需要将HTML表单的enctype属性设置为"multipart/form-data"，还需要将表单的method属性设置为"post"

	  

		
 代码如下
		
复制代码
	  
	  

		
<form action="" enctype="multipart/form-data" method="post">
        ...
form>

	  
	为了能使用户能够选择文件上传，表单中至少应该提供一个字段：

	  

		
 代码如下
		
复制代码
	  
	  

		
<form action="multi_upload.action" enctype="multipart/form-data" method="post" id="uploadForm"> 
    Choose a file to Upload:<input type="file" name="file"/>

    <input type="submit" value="submit"/>
form>

	  
	在浏览器显示的效果：

	  

		
 代码如下
		
复制代码
	  
	  

		
<s:form action="multi_upload" method="post" enctype="multipart/form-data">
    <s:file name="attachment" label="Attachment 1"/>
    <s:file name="attachment" label="Attachment 2"/>
    <s:file name="attachment" label="Attachment 3"/>
    <s:submit value="submit"/>
s:form>

	  
	Struts 2的file标签，在浏览器中会被映射为。

	  

		
 代码如下
		
复制代码
	  
	  

		
private File[] attachmentFile;
private String[] attachmentFileName;
private String[] attachmentContentType;

或

private List attachmentFile;
private List attachmentFileName;
private List attachmentContentType;


	  
	

	  

		
 代码如下
		
复制代码
	  
	  

		
public class SingleFileUploadAction extends ActionSupport
{
    private static final long    serialVersionUID    = 742220866388022377L;

    private File                 attachment;                                // 用户上传的文件
    private String               attachmentFileName;                        // 上传文件的文件名
    private String               attachmentContentType;                     // 上传文件的类型
    private String               description;                               // 用户的描述

    /*
     * SingleFileUploadAction的属性的getter和setter方法
     */
    public File getAttachment()
    {
        return attachment;
    }

    public void setAttachment(File attachment)
    {
        this.attachment = attachment;
    }

    public String getAttachmentFileName()
    {
        return attachmentFileName;
    }

    public void setAttachmentFileName(String attachmentFileName)
    {
        this.attachmentFileName = attachmentFileName;
    }

    public String getAttachmentContentType()
    {
        return attachmentContentType;
    }

    public void setAttachmentContentType(String attachmentContentType)
    {
        this.attachmentContentType = attachmentContentType;
    }

    public String getDescription()
    {
        return description;
    }

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

    public String execute() throws Exception
    {
        if (attachment != null)
        {
            String dataDir = "d:images";// 上传文件存放的目录
            File savedFile = new File(dataDir, attachmentFileName);// 上传文件在服务器具体的位置
            attachment.renameTo(savedFile);// 将上传文件从临时文件复制到指定文件
        }
        else
        {
            return INPUT;
        }

        return SUCCESS;
    }
}

上传文件的表单：

<s:form action="single_upload" method="post" enctype="multipart/form-data">
    <s:textfield name="description" label="description">s:textfield>
    <s:file name="attachment" label="Choose a File to Upload">s:file>
    <s:submit value="submit">s:submit>
s:form>


	  
	

	  

		
 代码如下
		
复制代码
	  
	  

		
<action name="single_upload" class="struts2.suxiaolei.fileupload.action.SingleFileUploadAction">
    <result name="success">/success_single_upload.jspresult>
    <result name="input">/single_upload.jspresult>
            
    <interceptor-ref name="defaultStack">
        <param name="fileUpload.maximumSize">100000param>
        <param name="fileUpload.allowedTypesSet">image/gif,image/jpeg,image/pngparam>
    interceptor-ref>
action>

	  
	测试：

	  

		
 代码如下
		
复制代码
	  
	  

		
<form action="multi_upload.action" enctype="multipart/form-data" method="post">
    <table>
        <tr>
            <td>
                Choose a file to Upload:
            td>
            <td id="more">
                <input type="file" name="file"/><input type="button" value="Add More..."onclick="addMore();"/>
            td>
        tr>

        <tr>
            <td>
            td>
            <td>
                <input type="submit" value="submit"/>
            td>
        tr>
    table>
form>

创建JavaScript代码，使表单能动态增减上传文件的个数



接收多个上传文件的动作类：

public class MultiFileUploadAction extends ActionSupport
{
    private static final long    serialVersionUID    = -5056971793538814980L;

    private List           fileFile;
    private List         fileFileName;
    private List         fileContentType;

    public List getFileFile()
    {
        return fileFile;
    }

    public void setFileFile(List fileFile)
    {
        this.fileFile = fileFile;
    }

    public List getFileFileName()
    {
        return fileFileName;
    }

    public void setFileFileName(List fileFileName)
    {
        this.fileFileName = fileFileName;
    }

    public List getFileContentType()
    {
        return fileContentType;
    }

    public void setFileContentType(List fileContentType)
    {
        this.fileContentType = fileContentType;
    }

    @Override
    public String execute()
    {
        if (fileFile.size() == 0)
        {
            return INPUT;
        }
        else
        {

            for (int index = 0; index < fileFile.size(); index++)
            {
                String targetDir = "d:images";
                File savedFile = new File(targetDir, fileFileName.get(index));
                fileFile.get(index).renameTo(savedFile);
            }
        }

        return SUCCESS;
    }

}

struts.xml配置信息：

<action name="multi_upload" class="struts2.suxiaolei.fileupload.action.MultiFileUploadAction">
    <result name="success">/success_multi_upload.jspresult>
    <result name="input">/multi_upload.jspresult>
            
    <interceptor-ref name="defaultStack">
        <param name="fileUpload.maximumSize">100000param>
        <param name="fileUpload.allowedTypesSet">image/gif,image/jpeg,image/pngparam>
    interceptor-ref>
action>


	  
	

<s:property value="fileFileName"/> Upload Successfully!