Struts2 文件上传下载

1. 单个文件上传

<s:form method="post" action="upload" namespace="/" enctype="multipart/form-data">
    <s:file name="upload"/>
    <s:submit/>
</s:form>

<action name="upload" class="tonny.study.struts.action.file.FileUploadAction">
    <param name="savePath">F:\\</param><!-- 文件保存路径 -->
    <result>/index.jsp</result>
</action>

public class FileUploadAction extends ActionSupport {
    private static final long serialVersionUID = 1L;

    private File upload;                 //上传文件页面标签name属性
    private String uploadContentType;    //上传文件的类型, 格式固定: name+ContentType
    private String uploadFileName;       //上传文件的名称, 格式固定: name+FileName
    
    private String savePath;             //通过struts.xml配置的保存路径
    
    @Override
    public String execute() throws Exception {
        FileOutputStream fos = new FileOutputStream(getSavePath() + getUploadFileName());
        FileInputStream fis = new FileInputStream(getUpload());
        
        byte[] buffer = new byte[1024];
        int len = 0;
        while ((len = fis.read(buffer)) > 0) {
            fos.write(buffer, 0, len);
        }
        
        fis.close();
        fos.close();
        
        return SUCCESS;
    }

    //省略一堆 getter/setter方法
}