package com.hzml.serve;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.*;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
@WebServlet("/FileUploadServlet")
public class FileUploadServlet extends HttpServlet {
private String filePath; // 文件存放目录
private String tempPath; // 临时文件目录
// 初始化
public void init() throws ServletException
{
super.init();
// 从配置文件中获得初始化参数
ServletContext context = getServletContext();
filePath = context.getRealPath("/") + "/hzmlFile";
tempPath = context.getRealPath("/") + "/hzmlFile";
System.out.println("文件存放目录、临时文件目录准备完毕 ...");
}
private void process(HttpServletRequest req, HttpServletResponse res)
throws IOException, ServletException{
res.setContentType("text/plain;charset=gbk");
PrintWriter pw = res.getWriter();
try{
DiskFileItemFactory diskFactory = new DiskFileItemFactory();
// threshold 极限、临界值，即硬盘缓存 1M
diskFactory.setSizeThreshold(4 * 1024);
// repository 贮藏室，即临时文件目录
diskFactory.setRepository(new File(tempPath));
ServletFileUpload upload = new ServletFileUpload(diskFactory);
// 设置允许上传的最大文件大小 4M
upload.setSizeMax(4 * 1024 * 1024);
// 解析HTTP请求消息头
List fileItems = upload.parseRequest(req);
Iterator iter = fileItems.iterator();
while(iter.hasNext())
{
FileItem item = (FileItem)iter.next();
if(item.isFormField())
{
System.out.println("处理表单内容 ...");
processFormField(item, pw);
}else{
System.out.println("处理上传的文件 ...");
processUploadFile(item, pw);
}
}// end while()
pw.close();
}catch(Exception e){
System.out.println("使用 fileupload 包时发生异常 ...");
e.printStackTrace();
}// end try ... catch ...
}
public void doPost(HttpServletRequest req, HttpServletResponse res)
throws IOException, ServletException {
process(req, res);
}
protected void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
process(req, res);
}
// 处理表单内容
private void processFormField(FileItem item, PrintWriter pw)
throws Exception
{
String name = item.getFieldName();
String value = item.getString();
pw.println(name + " : " + value + "\r\n");
}
// 处理上传的文件
private void processUploadFile(FileItem item, PrintWriter pw)
throws Exception
{
// 此时的文件名包含了完整的路径，得注意加工一下
String filename = item.getName();
System.out.println("完整的文件名：" + filename);
int index = filename.lastIndexOf("\\");
filename = filename.substring(index + 1, filename.length());
long fileSize = item.getSize();
if("".equals(filename) && fileSize == 0)
{
System.out.println("文件名为空 ...");
return;
}
pw.println(filePath);
File uploadFile = new File(filePath + "/" + filename);
item.write(uploadFile);
pw.println(filename + " 文件保存完毕 ...");
pw.println("文件大小为 ：" + fileSize + "\r\n");
}
}
本文转自 小眼儿 博客园博客，原文链接：http://www.cnblogs.com/hujunzheng/p/4574453.html，如需转载请自行联系原作者
