图片上传

package com.bjsxt.shopping.util.servlet;

import java.io.IOException;
import java.io.PrintWriter;

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

import org.apache.commons.fileupload.*;
import java.util.*;
import java.util.regex.*;
import java.io.*;
import org.apache.commons.fileupload.servlet.*;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;

public class FileUpload extends HttpServlet {
//BLOB

@Override
public void init(ServletConfig config) throws ServletException {
this.config = config;
}

private ServletConfig config = null;

private File tempPath = new File("D://upload//temp//"); // 用于存放临时文件的目录

public void destroy() {
config = null;
super.destroy();
}

public void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
int id = -1;

String uploadPath = config.getInitParameter("uploadPath"); // 用于存放上传文件的目录

res.setContentType("text/html; charset=GB2312");
PrintWriter out = res.getWriter();
System.out.println(req.getContentLength());
System.out.println(req.getContentType());
DiskFileItemFactory factory = new DiskFileItemFactory();
// maximum size that will be stored in memory
factory.setSizeThreshold(4096);
// the location for saving data that is larger than getSizeThreshold()
factory.setRepository(tempPath);

ServletFileUpload upload = new ServletFileUpload(factory);
// maximum size before a FileUploadException will be thrown
upload.setSizeMax(1000000);
try {
List fileItems = upload.parseRequest(req);
// assume we know there are two files. The first file is a small
// text file, the second is unknown and is written to a file on
// the server
Iterator iter = fileItems.iterator();

// 正则匹配，过滤路径取文件名
String regExp = ".+////(.+)$";

// 过滤掉的文件类型
String[] errorType = { ".exe", ".com", ".cgi", ".jsp" };
Pattern p = Pattern.compile(regExp);
while (iter.hasNext()) {
FileItem item = (FileItem) iter.next();
if(item.isFormField()) {
if(item.getFieldName().equals("id")) {
id = Integer.parseInt(item.getString());
}
}
// 忽略其他不是文件域的所有表单信息
if (!item.isFormField()) {
String name = item.getName();
long size = item.getSize();
if ((name == null || name.equals("")) && size == 0)
continue;
Matcher m = p.matcher(name);
boolean result = m.find();
if (result) {
for (int temp = 0; temp < errorType.length; temp++) {
if (m.group(1).endsWith(errorType[temp])) {
throw new IOException(name + ": wrong type");
}
}
try {

// 保存上传的文件到指定的目录

// 在下文中上传文件至数据库时，将对这里改写
item.write(new File(uploadPath + id + ".jpg"));

out.print(name + "&nbsp;&nbsp;" + size + "<br>");
} catch (Exception e) {
out.println(e);
}

} else {
throw new IOException("fail to upload");
}
}
}
} catch (IOException e) {
out.println(e);
} catch (FileUploadException e) {
out.println(e);
}

}

}