标签：label summary new set big dir array override cat
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!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=UTF-8">
<title>文件上传</title>
</head>
<body>
<!-- multipart/form-data -->
<form action="${pageContext.request.contextPath }/upload" enctype="multipart/form-data" method="post">
<hr>
用户名: <input type="text" name="username"><hr>
头像: <input type="file" name="headimage"><hr>
<input type="submit" value="提交"><hr>
</form>
</body>
</html>
package com.xiaoshitou.web.servlet;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* 文件上传
*/
public class UploadServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
ServletInputStream in = request.getInputStream();
int len = 0;
byte[] bytes = new byte[1024*2];
ByteArrayOutputStream out = new ByteArrayOutputStream();
while ((len = in.read(bytes)) != -1){
out.write(bytes, 0, len);
}
// 这里直接把 输入的流里面的东西都打印出来了，也可以对输入流中的内容解析，然后持久化到磁盘中
System.out.print(new String(out.toByteArray(),"utf-8"));
out.close();
in.close();
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doGet(request, response);
}
}
------WebKitFormBoundaryC6ADDE8SNt0FPina
Content-Disposition: form-data; name="username"
老黑
------WebKitFormBoundaryC6ADDE8SNt0FPina
Content-Disposition: form-data; name="headimage"; filename="个人文档.txt"
Content-Type: text/plain
windos 查看端口被那个进程占用 netstat -ano | findstr "8080"
windos 查看进程号的程序名字 tasklist|findstr "2720"
书写一个功能的时候，多问自己：
1 有没有线程安全问题
2 有没有性能问题
3 当前解决方案，有没有极端特殊情况
4 当前解决方案，理论上没有问题，实际操作，是否可行（数据库可行，java代码可行，前端页面可行）
------WebKitFormBoundaryC6ADDE8SNt0FPina--
// 使用fileupload来完成上传
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
DiskFileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload fileUpload = new ServletFileUpload(factory);
try {
// 解析请求
List<FileItem> fileItems = fileUpload.parseRequest(request);
for (FileItem item : fileItems) {
// 判断是否是form表单中的普通字段
if (item.isFormField()){
// 获取提交的name值
String fieldName = item.getFieldName();
// 获取提交的value
String value = item.getString("utf-8");
System.out.println(fieldName);
System.out.println(value);
}else{
// 是文件上传的字段
String fieldName = item.getFieldName(); // 提交的input的name值
String name = item.getName();// 上传文件的 文件名
// 存放在服务器的具体路径和文件名
String dir = this.getServletContext().getRealPath("/upload") + DirUtils.getDir(name);
File dirFile = new File(dir);
if (!dirFile.exists()){
dirFile.mkdirs();
}
// 将上传的文件写入file中
try {
item.write(new File(dirFile, UUIDUtils.getUUID()+name));
} catch (Exception e) {
e.printStackTrace();
}
}
}
} catch (FileUploadException e) {
e.printStackTrace();
}
}
package com.xiaoshitou.utils;
/**
* 根据文件名目录打散工具类
*/
public class DirUtils {
public static String getDir(String name) {
if (name != null) {
int code = name.hashCode();
return "/" + (code & 15) + "/" + (code >>> 4 & 15);
}
return null;
}
}
package com.xiaoshitou.utils;
import java.util.UUID;
/**
* 防止文件名重复UUID重写文件名的方法
*/
public class UUIDUtils {
public static String getUUID() {
return UUID.randomUUID().toString().replace("-", "");
}
}
标签：label summary new set big dir array override cat
原文地址：http://www.cnblogs.com/xiaoshitoutest/p/7358802.html
