package xin.glue.ui.common;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ExcelDownload extends HttpServlet{
	private String fileName;
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	
	@Override
	public void init() throws ServletException {
		super.init();
		fileName=	this.getClass().getClassLoader().getResource("/").getPath().replaceFirst("WEB-INF/classes/", "")+"tmp/";
		try {
			fileName =URLDecoder.decode(fileName,"utf-8");
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		File file = new File(fileName);
    	if(!file.exists()){
    		file.mkdirs();
    	}
	}

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String filepath = request.getParameter("filepath");
        if(filepath.indexOf(".xml")>0){
        	filepath = filepath +XmlOutput.EXT;
        }
        String fullFilePath = fileName + filepath;
        /*读取文件*/
        File file = new File(fullFilePath);
        /*如果文件存在*/
        if (file.exists()) {
        	String name = URLEncoder.encode(file.getName(), "utf-8");
            response.reset();
            response.setContentType("application/x-msdownload");
            response.addHeader("Content-Disposition", "attachment; filename=\"" + name + "\"");
            int fileLength = (int) file.length();
            response.setContentLength(fileLength);
            /*如果文件长度大于0*/
            if (fileLength != 0) {
                /*创建输入流*/
                InputStream inStream = new FileInputStream(file);
                byte[] buf = new byte[4096];
                /*创建输出流*/
                ServletOutputStream servletOS = response.getOutputStream();
                int readLength;
                while (((readLength = inStream.read(buf)) != -1)) {
                    servletOS.write(buf, 0, readLength);
                }
                inStream.close();
                servletOS.flush();
                servletOS.close();
            }
        }
    }

}