JSP servlet实现文件上传下载和删除(web项目jsp报错)这都可以?

随心笔谈11个月前发布 admin
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本文实例为大家分享了Android九宫格图片展示的具体代码,供大家参考,具体内容如下

由于存储空间,对一般用户而言,就是用来操作存储文件的,所以这两天,特意看了一下windows下用servlet实现文件上传、下载和删除,下面是详细代码说明

上传:

用的是commons-fileupload-1.2.2.jar和commons-io-2.0.1.jar组件,可以去apache官网上去下载,然后放到WebRoot/WEB-INF/lib目录下 

upload.html

<html>
<head>
<meta http-equiv=”Content-Type” content=”text/html; charset=GBK”>
<title>File upload</title>
</head>
<body>
<!– action=”fileupload”对应web.xml中<servlet-mapping>中<url-pattern>的设置.–>
<!– 必须是multipart的表单数据,才能完整的传递文件数据 –>
<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里加上下面几行:

<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目录下新建文件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”; // 上传文件的目录

@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(‘上传成功’);window.location.href=’https://www.jb51.net/article/index.jsp’;
// –></mce:script>”);
} catch (Exception e) {
// 可以跳转出错页面
e.printStackTrace();
}
}

public void init() throws ServletException {
File uploadFile=new File(uploadPath);
if (!uploadFile.exists()) {
uploadFile.mkdirs();
}
}
}

再看下载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; // 输入流
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);
}

}

删除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(‘删除成功’);window.location.href=’https://www.jb51.net/article/index.jsp’;
// –></mce:script>”);
} else {

}

}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
doGet(request, response);
}
}

 因为ubuntu server是黑屏,本人用的是ubuntu server10.04,不方便用浏览器来查看文件,因为没有图形界面,也不方便调试,所以可以先在windows上测试通过,然后把相应文件拷到ubuntu server中的tomcat相应目录下,可以通过samba来传文件,但遇到一个问题,就是中文乱码的问题,因为在开始安装时,选的是英文,后面用网上的一些办法,还是没有解决中文乱码的问题,有知道的大侠,还烦请转告。

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。

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