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:Unable to intantiate Action

热度:1497   发布时间:2013-02-25 21:12:26.0
求救:Unable to intantiate Action!
本人新手,在学struts2,在提交表单后总是抛出java.lang.InstantiationException异常。
jsp页面如下:
HTML code
<%@ page language="java" contentType="text/html; charset=gbk"    pageEncoding="gbk"%><%@ taglib prefix="s" uri="/struts-tags"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html>    <head>        <meta http-equiv="Content-Type"            content="text/html; charset=ISO-8859-1">        <title>Insert title here</title>    </head>    <body>        <s:form action="upload" enctype="multipart/form-data" theme="simple">            <table border="1" align="center">                <tr>                    <td>                        username:                    </td>                    <td>                        <s:textfield name="username"></s:textfield>                    </td>                </tr>                <tr>                <td>                    passwors:                </td>                <td>                    <s:password name="password"></s:password>                </td>                </tr>                <tr>                <td>                    file:                </td>                <td>                    <s:file name="file"></s:file>                </td>                </tr>                <tr>                <td>                    <s:submit value="submit"></s:submit>                </td>                <td>                    <s:reset value="reset"></s:reset>                </td>                </tr>            </table>        </s:form>    </body></html>

action代码如下:
Java code
package com.test.action;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.InputStream;import java.io.OutputStream;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public abstract class UploadAction extends ActionSupport {    private String username;    private String password;    private File file;    private String fileFileName;    private String fileContentType;    public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    public String getPassword() {        return password;    }    public void setPassword(String password) {        this.password = password;    }    public File getFile() {        return file;    }    public void setFile(File file) {        this.file = file;    }    public String getFileFileName() {        return fileFileName;    }    public void setFileFileName(String fileFileName) {        this.fileFileName = fileFileName;    }    public String getFileContentType() {        return fileContentType;    }    public void setFileContentType(String fileContentType) {        this.fileContentType = fileContentType;    }    public String execute()throws Exception    {        InputStream is = new FileInputStream(file);        String root = ServletActionContext.getRequest().getRealPath("/upload");                File destfile = new File(root,this.getFileFileName());        OutputStream os = new FileOutputStream(destfile);        byte[] buffer = new byte[400];        int length = 0;        while((length=is.read(buffer))>0)        {            os.write(buffer,0,length);        }        is.close();        os.close();        return SUCCESS;    }}
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