package fileServlet;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class FileUp extends HttpServlet {
public static final int MAX_SIZE = 1024 * 1024*100;
public static final String FILE_DIR = "D:/Temp/";
public void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
DataInputStream dis = new DataInputStream(req.getInputStream());
PrintStream ps = new PrintStream(res.getOutputStream());
String content = req.getContentType();
if (content != null && content.indexOf("multipart/form-data") != -1) {
int reqSize = req.getContentLength();
byte[] data = new byte[reqSize];
int bytesRead = 0;
int totalBytesRead = 0;
int sizeCheck = 0;
while (totalBytesRead < reqSize) {
// check for maximum file size violation
sizeCheck = totalBytesRead + dis.available();
if (sizeCheck > MAX_SIZE) {
ps.println("文件太大不能上传...");
return;
}
bytesRead = dis.read(data, totalBytesRead, reqSize);
totalBytesRead += bytesRead;
}
String dataString = new String(data, "ISO-8859-1");
// 分离filepath 并赋值
dataString = dataString
.substring(dataString.indexOf("filename=\""));
String filePath = dataString.substring(0, dataString
.indexOf("Content-Type:"));
// 分离contentType 并赋值
dataString = dataString.substring(dataString
.indexOf("Content-Type:") + 1);
// String contentType = dataString.substring(0, dataString.
// indexOf("\n"));
dataString = dataString.substring(dataString.indexOf("\n") + 1);
// 分离文件信息 获得最终想要的字节
dataString = dataString.substring(2,
dataString.lastIndexOf("\n") - 1);
dataString = dataString.substring(0,
dataString.lastIndexOf("\n") - 1);
writeFile(dataString.getBytes("ISO-8859-1"), FILE_DIR
+ getFileName(filePath));
ps.println("文件上传完毕...");
}
}
public boolean writeFile(byte[] data, String path) {
File f = null;
FileOutputStream fos = null;
try {
f = new File(path);
f.createNewFile();
fos = new FileOutputStream(f);
fos.write(data, 0, data.length);
} catch (FileNotFoundException e) {
return false;
} catch (IOException e) {
return false;
} finally {
try {
fos.close();
} catch (IOException e) {
return false;
}
}
return true;
}
public String getFileName(String arg) {
String path = arg.substring(arg.indexOf("\"") + 1, arg
.lastIndexOf("\""));
path = path.substring(path.lastIndexOf("\\") + 1);
return path;
}
}
//
注意：首先得在D:盘下建立Temp目录~！否则回有异常~！经过测试 ，上传10M的东东
，只需3秒种,如果你的服务器还可以你可以修改public static final int MAX_SIZE = 1024 *
1024*100;的值 上传更大的东东
posted on 2006-08-06 11:24
dragon 阅读(160)
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