JSP servlet實(shí)現(xiàn)文件上傳下載和刪除
本文實(shí)例為大家分享了android九宮格圖片展示的具體代碼，供大家參考，具體內(nèi)容如下
由于存儲(chǔ)空間，對(duì)一般用戶而言，就是用來操作存儲(chǔ)文件的，所以這兩天，特意看了一下windows下用servlet實(shí)現(xiàn)文件上傳、下載和刪除，下面是詳細(xì)代碼說明
上傳：
用的是commons-fileupload-1.2.2.jar和commons-io-2.0.1.jar組件，可以去apache官網(wǎng)上去下載，然后放到webroot/web-inf/lib目錄下
upload.html
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=gbk">
<title>file upload</title>
</head>
<body>
<!-- action="fileupload"對(duì)應(yīng)web.xml中<servlet-mapping>中<url-pattern>的設(shè)置.-->
<!-- 必須是multipart的表單數(shù)據(jù),才能完整的傳遞文件數(shù)據(jù) -->
<form name="myform" action="fileupload" method="post"
enctype="multipart/form-data">
file:<br>
<input type="file" name="myfile"><br>
<br>
<input type="submit" name="submit" value="commit">
</form>
</body>
</html>
web.xml里加上下面幾行：
<servlet> <servlet-name>upload</servlet-name> <servlet-class>am.demo.upload</servlet-class> </servlet> <servlet-mapping> <servlet-name>upload</servlet-name> <url-pattern>/fileupload</url-pattern> </servlet-mapping>
src目錄下新建文件upload.java：
package am.demo;
import java.io.file;
import java.io.ioexception;
import java.util.iterator;
import java.util.list;
import javax.servlet.servletexception;
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;
@suppresswarnings("serial")
public class upload extends httpservlet {
private string uploadpath = "d://temp"; // 上傳文件的目錄
@suppresswarnings("unchecked")
public void dopost(httpservletrequest request, httpservletresponse response)
throws ioexception, servletexception {
try {
// create a factory for disk-based file items
diskfileitemfactory factory = new diskfileitemfactory();
// create a new file upload handler
servletfileupload upload = new servletfileupload(factory);
list<fileitem> items = upload.parserequest(request);// 得到所有的文件
iterator<fileitem> i = items.iterator();
while (i.hasnext()) {
fileitem fi = (fileitem) i.next();
string filename = fi.getname();
if (filename != null) {
file fullfile = new file(fi.getname());
file savedfile = new file(uploadpath, fullfile.getname());
fi.write(savedfile);
}
}
response.setcontenttype("text/html;charset=gbk");
response.getwriter().print(
"<mce:script language='javascript'><!--
alert('上傳成功');window.location.href='index.jsp';
// --></mce:script>");
} catch (exception e) {
// 可以跳轉(zhuǎn)出錯(cuò)頁面
e.printstacktrace();
}
}
public void init() throws servletexception {
file uploadfile = new file(uploadpath);
if (!uploadfile.exists()) {
uploadfile.mkdirs();
}
}
}
再看下載downlaod.java:
package am.demo;
import java.io.file;
import java.io.fileinputstream;
import java.io.ioexception;
import java.io.outputstream;
import javax.servlet.servletexception;
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
@suppresswarnings("serial")
public class download extends httpservlet {
public void doget(httpservletrequest request, httpservletresponse response)
throws ioexception, servletexception {
string afilename = new string(request.getparameter("name").getbytes(
"iso8859-1"), "gbk");
file fileload = new file("d:/temp", afilename);
fileinputstream in = null; // 輸入流
outputstream out = response.getoutputstream();
byte b[] = new byte[1024];
try {
response.setcontenttype("application/x-msdownload;");
response.setheader("content-disposition", "attachment; filename="
+ new string(afilename.getbytes("gbk"), "iso-8859-1"));
// download the file.
in = new fileinputstream(fileload);
int n = 0;
while ((n = in.read(b)) != -1) {
out.write(b, 0, n);
}
} catch (throwable e) {
e.printstacktrace();
} finally {
try {
in.close();
out.close();
} catch (throwable e) {
e.printstacktrace();
}
}
}
public void dopost(httpservletrequest request, httpservletresponse response)
throws ioexception, servletexception {
doget(request, response);
}
}
刪除delete.java:
package am.demo;
import java.io.file;
import java.io.filenotfoundexception;
import java.io.ioexception;
import javax.servlet.servletexception;
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
@suppresswarnings("serial")
public class delete extends httpservlet {
public void doget(httpservletrequest request, httpservletresponse response)
throws filenotfoundexception, ioexception {
string afilename = new string(request.getparameter("name").getbytes(
"iso8859-1"), "gbk");
file file = new file("d:/temp", afilename);
response.setcontenttype("text/html;charset=gbk");
if (!file.isdirectory()) {
file.delete();
response.getwriter().print(
"<mce:script language='javascript'><!--
alert('刪除成功');window.location.href='index.jsp';
// --></mce:script>");
} else {
}
}
public void dopost(httpservletrequest request, httpservletresponse response)
throws ioexception, servletexception {
doget(request, response);
}
}
因?yàn)閡buntu server是黑屏，本人用的是ubuntu server10.04，不方便用瀏覽器來查看文件，因?yàn)闆]有圖形界面，也不方便調(diào)試，所以可以先在windows上測(cè)試通過，然后把相應(yīng)文件拷到ubuntu server中的tomcat相應(yīng)目錄下，可以通過samba來傳文件，但遇到一個(gè)問題，就是中文亂碼的問題，因?yàn)樵陂_始安裝時(shí)，選的是英文，后面用網(wǎng)上的一些辦法，還是沒有解決中文亂碼的問題，有知道的大俠，還煩請(qǐng)轉(zhuǎn)告。
以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持碩編程。
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