jsp表单
<%@ page language="java" pageEncoding="utf-8"%> <html>
<head>
<title>My JSP 'index.jsp' starting page</title>
</head> <body>
<form action="cos.jsp" method="post" enctype="multipart/form-data">
<input type="text" name="info1"><br>
<input type="text" name="info2"><br>
<input type="file" name="userface1"><br>
<input type="file" name="userface2"><br>
<input type="file" name="userface3"><br>
<input type="submit" name="mysub" value="upfile">
</form>
</body>
</html>
cos组件实现文件上传 jsp代码
<%@ page language="java" pageEncoding="utf-8"%>
<%@ page import="java.io.File"%>
<%@ page import="com.oreilly.servlet.multipart.FilePart"%>
<%@ page import="com.oreilly.servlet.multipart.ParamPart"%>
<%@ page import="com.oreilly.servlet.multipart.Part"%>
<%@ page import="com.oreilly.servlet.multipart.MultipartParser"%>
<%
//使用cos组件实现文件上传
MultipartParser mp = new MultipartParser(request, 10 * 1024 * 1024);
Part part;
mp.setEncoding("utf-8");//取决于来源页面的编码，如果是表态的应为gbk，如果是jsp应为utf-8
int ii = 0;
while ((part = mp.readNextPart()) != null) {
String name = part.getName();
if (part.isParam()) {
ParamPart paramPart = (ParamPart) part;
String value = paramPart.getStringValue();
out.println("param: name=" + name + "; value=" + value);
System.out.println(value);
} else if (part.isFile()) {
FilePart filePart = (FilePart) part;
String fileName = filePart.getFileName();
if (fileName != null) {
long size = filePart.writeTo(new File(this.getServletContext().getRealPath("/upload")));
out.println("file: name=" + name + "; fileName=" + fileName +
", filePath=" + filePart.getFilePath() +
", contentType=" + filePart.getContentType() +
", size=" + size);
}else {
out.println("file: name=" + name + "; EMPTY");
}
out.print(fileName);
}
}
%>
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文件命名机制
1.根据uuid
import java.io.File;
import java.util.UUID; import com.oreilly.servlet.multipart.FileRenamePolicy; public class MyUuid implements FileRenamePolicy { @Override
public File rename(File f) {
String body = UUID.randomUUID().toString();
String ext = "";
int pot = f.getName().lastIndexOf(".");
if (pot != -1) {
ext = f.getName().substring(pot);
}
String newName = body + ext;
f = new File(f.getParent(), newName);
return f;
} }
2.根据时间随机数
import java.io.File;
import java.util.UUID; import com.oreilly.servlet.multipart.FileRenamePolicy; public class MyRandom implements FileRenamePolicy { @Override
public File rename(File f) {
String body = String.valueOf(System.currentTimeMillis());
String ext = "";
int pot = f.getName().lastIndexOf(".");
if (pot != -1) {
ext = f.getName().substring(pot);
}
String newName = body + ext;
f = new File(f.getParent(), newName);
return f;
} }
3.上传文件并改名字
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>cc.html</title>
</head> <body>
<form action="cc.jsp" method="post" enctype="multipart/form-data">
姓名:<input type="text" name="uname"><br>
文件1:<input type="file" name="ufile1"><br>
文件2:<input type="file" name="ufile2"><br>
<input type="submit" value="提交">
</form> </body>
</html>
<%@page import="com.MyRandom"%>
<%@ page language="java" pageEncoding="utf-8"%>
<%@ page import="com.oreilly.servlet.MultipartRequest"%>
<%@ page import="com.oreilly.servlet.multipart.DefaultFileRenamePolicy"%>
<%@ page import="com.MyUuid"%>
<%@ page import="java.io.File"%>
<%
//使用cos组件实现文件上传
String path = this.getServletContext().getRealPath("/upload");
//MultipartRequest req = new MultipartRequest(request, path, "utf-8");
//out.print(req.getParameter("uname"));
//out.print("<hr>");
//out.print(req.getFile("ufile1").getName());
//out.print(req.getFile("ufile2").getName()); //MultipartRequest req = new MultipartRequest(request,path,10*1024*1024,"utf-8",new MyUuid());
MultipartRequest req = new MultipartRequest(request,path,10*1024*1024,"utf-8",new MyRandom());
out.print(req.getFile("ufile1").getName()); %>
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用servlet技术用cos组建实现上传下载
一、JSP页面如下：