文 件上传的时候struts会使用默认18个拦截器中的<interceptor name="fileUpload" class="org.apache.struts2.interceptor.FileUploadInterceptor"/>进行处理。

文件上传Action类：

Action类中定义三个属性：

private File file1; 对应表单：<input type="file" name="file1">
private String file1FileName; 文件名
private String file1ContentType;文件的类型(MIME)

并且提供这三个属性的set方法。

文件上传表单：

    <form action="${pageContext.request.contextPath }/fileUploadAction" method="post" enctype="multipart/form-data">  
            用户名:<input type="text" name="userName"><br/>  
            文件:<input type="file" name="file1"><br/>  
            <input type="submit" value="上传">  
        </form>  

    package cn.itcast.upload;  
      
    import java.io.File;  
    import java.io.IOException;  
      
    import org.apache.commons.io.FileUtils;  
    import org.apache.struts2.ServletActionContext;  
      
    import com.opensymphony.xwork2.ActionSupport;  
      
    public class UploadAction extends ActionSupport{  
      
        // 对应表单：<input type="file" name="file1">  
        private File file1;   
        // 文件名  
        private String file1FileName;  
        // 文件的类型(MIME)  
        private String file1ContentType;  
        public void setFile1(File file1) {  
            this.file1 = file1;  
        }  
        public void setFile1FileName(String file1FileName) {  
            this.file1FileName = file1FileName;  
        }  
        public void setFile1ContentType(String file1ContentType) {  
            this.file1ContentType = file1ContentType;  
        }  
        public String upload() throws IOException{  
            //得到上传的文件夹  
            String path=ServletActionContext.getServletContext().getRealPath("/upload");  
            //创建文件  
            File file=new File(path,file1FileName);  
            //讲上传的文件上传到指定的文件夹  
            FileUtils.copyFile(file1, file);  
            return "success";  
        }  
    }  

    <struts>  
        <package name="upload_" extends="struts-default">  
            <!-- 注意： action 的名称不能用关键字"fileUpload" -->  
            <action name="fileUploadAction" class="cn.itcast.upload.UploadAction" method="upload">  
                <result name="success">/index.jsp</result>  
                <!-- 配置错误视图 -->  
                <result name="input">/error.jsp</result>  
            </action>  
            </package>  
    </struts>