jsp+javaBean 网站附件管理系统(未完成版)-3

最新推荐文章于 2024-03-26 07:15:00 发布

lijiuu

最新推荐文章于 2024-03-26 07:15:00 发布

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分类专栏： JAVA Web 文章标签： jsp byte null import javabeans bean

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本文介绍了一个使用JSP和JavaBean实现的附件上传功能，包括设置上传目录、解析文件名及内容类型等关键步骤。

处理附件上传的JSP页面与JAVA Bean

<%@ page language="java" contentType="text/html; charset=GB18030"

pageEncoding="GB18030"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<jsp:useBean id="FUpload" scope="page" class="edu.scnu.crjy.common.UploadFiles"></jsp:useBean>

</head>

<body>

String documentRoot = getServletContext().getRealPath("/");

String Dir = documentRoot+"appendfiles//"+request.getParameter("childDir");

out.println(request.getParameter("childDir"));

//保存文件的路径，请确保目录存在，或改到其他目录

//通过调用JavaBeans的方法完成上传操作

FUpload.setUploadDirectory(Dir);

FUpload.uploadFile(request);

alert("上传附件成功！");

document.location.href="../appendfileslist.jsp?childDir=<%=request.getParameter("childDir")%>"

</script>

</body>

</html>

注：这个处理上传的bean有大部分是从csdn中获得的资料

package edu.scnu.crjy.common;

import java.io.*;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.ServletInputStream;

import javax.servlet.ServletException;

public class UploadFiles {

private static String newline = " "; // 设定换行符

private String uploadDirectory = "."; // 默认的保存位置

private String ContentType = ""; // 文件类型

private String CharacterEncoding = ""; // 编码格式

// 设定文件要保存在服务器中的位置

public void setUploadDirectory(String s) {

uploadDirectory = s;

}

// 提取文件名，本方法是把用户上传的文件按照原名保存

private String getFileName(String s) {

int i = s.lastIndexOf("/");

if (i < 0 || i >= s.length() - 1) {

i = s.lastIndexOf("/");

if (i < 0 || i >= s.length() - 1)

return s;

}

return s.substring(i + 1);

}

// 得到content-type

public void setContentType(String s) {

ContentType = s;

int j;

if ((j = ContentType.indexOf("boundary=")) != -1) {

ContentType = ContentType.substring(j + 9);

ContentType = "--" + ContentType;

}

// 得到文件编码格式

public void setCharacterEncoding(String s) {

CharacterEncoding = s;

}

public void uploadFile(HttpServletRequest req) throws ServletException,

IOException {

setCharacterEncoding(req.getCharacterEncoding());

setContentType(req.getContentType());

uploadFile(req.getInputStream());

}

public void uploadFile(ServletInputStream servletinputstream)

throws ServletException, IOException {

String s5 = null;

String filename = null;

byte Linebyte[] = new byte[4096];

byte outLinebyte[] = new byte[4096];

int ai[] = new int[1];

int ai1[] = new int[1];

String line;

// 得到文件名

while ((line = readLine(Linebyte, ai, servletinputstream,

CharacterEncoding)) != null) {

int i = line.indexOf("filename=");

if (i >= 0) {

line = line.substring(i + 10);

if ((i = line.indexOf(""")) > 0)

line = line.substring(0, i);

break;

}

filename = line;

if (filename != null && !filename.equals(""")) {

filename = getFileName(filename);

String sContentType = readLine(Linebyte, ai, servletinputstream,

CharacterEncoding);

if (sContentType.indexOf("Content-Type") >= 0)

readLine(Linebyte, ai, servletinputstream, CharacterEncoding);

// 建立新文件的文件句柄

File file = new File(uploadDirectory, filename);

// 建立生成新文件的输出流

FileOutputStream fileoutputstream = new FileOutputStream(file);

while ((sContentType = readLine(Linebyte, ai, servletinputstream,

CharacterEncoding)) != null) {

if (sContentType.indexOf(ContentType) == 0 && Linebyte[0] == 45)

break;

if (s5 != null) {

// 写入新文件

fileoutputstream.write(outLinebyte, 0, ai1[0]);

fileoutputstream.flush();

}

s5 = readLine(outLinebyte, ai1, servletinputstream,

CharacterEncoding);

if (s5 == null || s5.indexOf(ContentType) == 0

&& outLinebyte[0] == 45)

break;

fileoutputstream.write(Linebyte, 0, ai[0]);

fileoutputstream.flush();

}

byte byte0;

if (newline.length() == 1)

byte0 = 2;

else

byte0 = 1;

if (s5 != null && outLinebyte[0] != 45

&& ai1[0] > newline.length() * byte0)

fileoutputstream.write(outLinebyte, 0, ai1[0]

- newline.length() * byte0);

if (sContentType != null && Linebyte[0] != 45

&& ai[0] > newline.length() * byte0)

fileoutputstream.write(Linebyte, 0, ai[0] - newline.length()

* byte0);

fileoutputstream.close();

}

// readLine函数把表单提交上来的数据按行读取

private String readLine(byte Linebyte[], int ai[],

ServletInputStream servletinputstream, String CharacterEncoding) {

try { // 读取一行

ai[0] = servletinputstream.readLine(Linebyte, 0, Linebyte.length);

if (ai[0] == -1)

return null;

} catch (IOException ex) {

return null;

}

try {

if (CharacterEncoding == null) {

// 用默认的编码方式把给定的byte数组转换为字符串

return new String(Linebyte, 0, ai[0]);

} else {

// 用给定的编码方式把给定的byte数组转换为字符串

return new String(Linebyte, 0, ai[0], CharacterEncoding);

}

} catch (Exception ex) {

return null;

}