struts2（文件上传和下载）

package action;

import com.opensymphony.xwork2.ActionSupport;
import org.apache.commons.io.FileUtils;
import org.apache.struts2.ServletActionContext;
import java.io.File;
import java.io.IOException;

public class UploadAction extends ActionSupport {
    private String uid;        　　　　　　　　　// 封装帐号（uid）请求参数属性
    private File headImage;     　　　　　　　　// 封装上传文件域属性
    private String headImageContentType;     // 封装上传文件类型的属性
    private String headImageFileName;　　　 　// 封装上传文件属性

    public String getUid() {
        return uid;
    }
    public void setUid(String uid) {
        this.uid = uid;
    }

    public File getHeadImage() {
        return headImage;
    }
    public void setHeadImage(File headImage) {
        this.headImage = headImage;
    }

    public String getHeadImageContentType() {
        return headImageContentType;
    }
    public void setHeadImageContentType(String headImageContentType) {
        this.headImageContentType = headImageContentType;
    }

    public String getHeadImageFileName() {
        return headImageFileName;
    }
    public void setHeadImageFileName(String headImageFileName) {
        this.headImageFileName = headImageFileName;
    }

    public String execute() throws IOException {
        // 上传文件的保存位置在“/image”,该位置在tomcat服务器的“webapps”之中
        String  realpath= ServletActionContext.getServletContext().getRealPath("/image");

        // 声明文件目录image，如果文件名不存在就建一个呗～
        File file = new File(realpath);
        if(!file.exists()){
            file.mkdirs();
        }

        // 实现文件上传，也就是做了一个方法调用～
        FileUtils.copyFile(headImage,new File(file,headImageFileName));
        return SUCCESS;
    }
}

package action;

import com.opensymphony.xwork2.ActionSupport;
import org.apache.struts2.ServletActionContext;
import util.MyUtil;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;

public class DownLoadAction extends ActionSupport{

    private String downPath;        // 下载时的文件名
    private String contentType;     // 保存文件类型
    private String filename;        // 保存时的文件名

    public String getContentType() {
        return contentType;
    }

    public void setContentType(String contentType) {
        this.contentType = contentType;
    }

    public String getFilename() {
        return filename;
    }

    public void setFilename(String filename) {
        this.filename = filename;
    }

    public String getDownPath() {
        return downPath;
    }
    public void setDownPath(String downPath) {
        try {
            // 解决下载时候的中文文件乱码问题
            downPath = new String(downPath.getBytes("ISO-8859-1"),"UTF-8");
        }catch (UnsupportedEncodingException e){
            e.printStackTrace();
        }
        this.downPath = downPath;
    }

   /*
    *下载用的Action返回一个InputString实例，该方法对应Action配置
    *里面的result的inputName参数，值为inputString
    *
    */

   public InputStream getInputString(){
       return ServletActionContext.getServletContext().getResourceAsStream(downPath);
   }

   public String execute(){
       // 下载保存时的文件名和被下载的文件名一样
       filename = downPath;
       // 下载的文件路径，请在webapps目录下创建images
       downPath = "images/" + downPath;
       // 保存文件的类型

       contentType = "application/x-msdownload";

       /*
        *对下载的文件名按照UTF-8进行编码，解决下载窗口中的中文乱码问题
        * 其中,MyUtil是自己定义的一个类
        */

       filename = MyUtil.toUTF8String(filename);
       return SUCCESS;
   }
}

package util;

import java.io.UnsupportedEncodingException;

public class MyUtil {
    // 对下载文件按照 UTF-8 进行编码

    public static String toUTF8String(String str){
        StringBuffer sb = new StringBuffer();
        int len = str.length();
        for (int i = 0; i < len; i++)
        {
            // 取出字符中的每个字符
            char c = str.charAt(i);
            // Unicode码值在0～255之间，不做处理
            if(c>=0 && c <= 255){
                sb.append(c);
            }else {
                // 转换 UTF-8 编码
                byte b[];
                try{
                    b = Character.toString(c).getBytes("UTF-8");
                }catch(UnsupportedEncodingException e){
                    e.printStackTrace();
                    b = null;
                }
                // 转换为%HH的字符串形式
                for(int j = 0;j < b.length ; j++){
                    int k = b[j];
                    if(k < 0){
                        k &= 255;
                    }
                    sb.append("%" + Integer.toHexString(k).toUpperCase());
                }
            }
        }
        return sb.toString();
    }
}

package example.struts2;

import java.io.InputStream;

import org.apache.commons.io.FileUtils;
import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;
import java.io.File;

public class DownloadFileCountAction extends ActionSupport{
	private String downloadPath;
	private String contentType;
	private String fileName;
	public String getDownloadPath() {
		return downloadPath;
	}
	public void setDownloadPath(String downloadPath) {
		this.downloadPath = downloadPath;
	}
	public String getContentType() {
		return contentType;
	}
	public void setContentType(String contentType) {
		this.contentType = contentType;
	}
	public String getFileName() {
		return fileName;
	}
	public void setFileNAme(String fileName) {
		this.fileName = fileName;
	}
	public String execute() throws Exception{
		downloadPath=ServletActionContext.getRequest().getParameter("download");
		int position=downloadPath.lastIndexOf("/");
		String downloadFilePath;
		if (position>0) {
			fileName=downloadPath.substring(position+1);
			downloadFilePath=downloadPath.substring(0,position+1);
		}
		else {
			fileName=downloadPath;
			downloadFilePath="";
		}
		int extPos= fileName.lastIndexOf(".");
		String contentTypeKey;
		if (extPos>0) {
			contentTypeKey="struts.contentType"+fileName.substring(extPos);
		}
		else {
			contentTypeKey="struts.contentType.txt";
		}
		
		contentType=getText(contentTypeKey);
		String counterFile= genNewFileName(downloadFilePath,fileName);
		setDownloadCount(counterFile);
		return SUCCESS;
	}
	public InputStream getInputStream() throws Exception{
		return ServletActionContext.getServletContext().getResourceAsStream(downloadPath);
		
	}
	private String genNewFileName(String filePath, String fileName) {
		// TODO Auto-generated method stub
		String serverRealPath=ServletActionContext.getServletContext().getRealPath(filePath)+"/DownloadCounter";
		File  dir=new File(serverRealPath);
		if (!dir.exists()) {
			dir.mkdir();
		}
		String downloadCountFile=serverRealPath+fileName+".txt";
		return downloadCountFile;
	}
	private void setDownloadCount(String fullFileName) throws Exception{
		// TODO Auto-generated method stub
		int curCount=1;
		File file=new File(fullFileName);
		if (file.exists()) {
			curCount=Integer.parseInt(FileUtils.readFileToString(new File(fullFileName)))+1;
		}
		FileUtils.writeStringToFile(file, Integer.toString(curCount));
		
	}
}