发布于 2016-08-18 00:14:38 | 99 次阅读 | 评论: 0 | 来源: 网友投递
JSP JAVA公司的WEB开发编程语言
JSP全名为Java Server Pages - java服务器页面是由Sun Microsystems公司倡导、许多公司参与一起建立的一种动态网页技术标准。JSP技术有点类似ASP技术，它是在传统的网页HTML（标准通用标记语言的子集）文件(*.htm,*.html)中插入Java程序段(Scriptlet)和JSP标记(tag)，从而形成JSP文件，后缀名为(*.jsp)。
本文实例讲述了JSP实现远程文件下载保存到服务器指定目录中的方法。分享给大家供大家参考，具体如下：
<%@page import="java.net.*,java.io.*"%>
<%!
public boolean saveUrlAs(String photoUrl, String fileName) {
//此方法只能用户HTTP协议
try {
URL url = new URL(photoUrl);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
DataInputStream in = new DataInputStream(connection.getInputStream());
DataOutputStream out = new DataOutputStream(new FileOutputStream(fileName));
byte[] buffer = new byte[4096];
int count = 0;
while ((count = in.read(buffer)) > 0) {
out.write(buffer, 0, count);
}
out.close();
in.close();
return true;
}
catch (Exception e) {
return false;
}
}
public String getDocumentAt(String urlString) {
//此方法兼容HTTP和FTP协议
StringBuffer document = new StringBuffer();
try {
URL url = new URL(urlString);
URLConnection conn = url.openConnection();
BufferedReader reader = new BufferedReader(new InputStreamReader(conn.
getInputStream()));
String line = null;
while ( (line = reader.readLine()) != null) {
document.append(line + "\n");
}
reader.close();
}
catch (MalformedURLException e) {
System.out.println("Unable to connect to URL: " + urlString);
}
catch (IOException e) {
System.out.println("IOException when connecting to URL: " + urlString);
}
return document.toString();
}
%>
<%
//测试
String photoUrl = "http://ad4.sina.com.cn/200601/12/43932_750450.jpg";
String fileName = photoUrl.substring(photoUrl.lastIndexOf("/"));
String filePath = "C:/test/";
boolean flag = saveUrlAs(photoUrl, filePath + fileName);
out.println("Run ok!\n<BR>Get URL file " + flag);
%>
希望本文所述对大家JSP程序设计有所帮助。