java中使用Struts 2框架上传文件代码

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

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

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

<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>

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

或

private List<File> attachmentFile;private List<String> attachmentFileName;private List<String> attachmentContentType;

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>

<action name="single_upload" class="struts2.suxiaolei.fileupload.action.SingleFileUploadAction"><result name="success">/success_single_upload.jsp</result><result name="input">/single_upload.jsp</result>

<interceptor-ref name="defaultStack"><param name="fileUpload.maximumSize">100000</param><param name="fileUpload.allowedTypesSet">image/gif,image/jpeg,image/png</param></interceptor-ref></action>

<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

<script type="text/javascript">

function addMore()    {var td = document.getElementById("more");//获取id="more"的元素，该元素用于容纳动态增减的上传文件元素

var br = document.createElement("br");//创建<br />元素        var input = document.createElement("input");//创建<input>元素，设置该元素的属性为<input type="file" name="file" />，用于选择上传的文件        var button = document.createElement("input");//创建<input>元素,设置该元素的属性为<input type="button" value="remove" />，用于移除上传标签

input.type = "file";        input.name = "file";

button.type = "button";        button.value = "remove";

//移除上传标签        button.onclick = function()        {            td.removeChild(br);            td.removeChild(input);            td.removeChild(button);        };

/*         * 添加上传标签*/        td.appendChild(br);        td.appendChild(input);        td.appendChild(button);    }

</script>

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<File>           fileFile;private List<String>         fileFileName;private List<String>         fileContentType;

public List<File> getFileFile()    {return fileFile;    }

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

public List<String> getFileFileName()    {return fileFileName;    }

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

public List<String> getFileContentType()    {return fileContentType;    }

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

@Overridepublic 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.jsp</result><result name="input">/multi_upload.jsp</result>

<interceptor-ref name="defaultStack"><param name="fileUpload.maximumSize">100000</param><param name="fileUpload.allowedTypesSet">image/gif,image/jpeg,image/png</param></interceptor-ref></action>