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Java上传文件common-fileupload

2016-07-11 14:23 495 查看

jsp文件上传大多采用开源项目Commons FileUpload来简化处理，可以在http://jakarta.apache.org/commons/fileupload/下载，这个包需要Commons
IO的支持，可以在http://jakarta.apache.org/commons/io/下载。Commons FileUpload提供三种文件上传处理方式，DiskFileUpload、ServletFileUpload和
PortletFileUpload三种方式，其中DiskFileUpload已经在javadoc下已经被标记为过期的方法，建议用 ServletFileUpload代替，而PortletFileUpload需要配合portlet-api来使用，所以这里我们只介绍 ServletFileUpload，并且这个也是最常用的。使用如下：

test.jsp：

<%@ page language="java" import="java.util.*" contentType="text/html;charset=gbk" pageEncoding="gbk"%>
<html>
<body>
<form action="/MultipartTestServlet" enctype="multipart/form-data" method="post">
<input type="text" name="username" /><br />
<input type="file" name="myfile" /><br/>
<input type="file" name="myfile" /><br/>
<input type="submit" />
</form>
</body>
</html>

MultipartTestServlet.java：

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
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.FileUpload;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.RequestContext;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.fileupload.servlet.ServletRequestContext;

public class MultipartTestServlet extends HttpServlet {

public MultipartTestServlet() {
super();
}

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

request.setCharacterEncoding("utf-8");
RequestContext requestContext = new ServletRequestContext(request);

if(FileUpload.isMultipartContent(requestContext)){

DiskFileItemFactory factory = new DiskFileItemFactory();
factory.setRepository(new File("c:/tmp/"));
ServletFileUpload upload = new ServletFileUpload(factory);
//upload.setHeaderEncoding("utf-8");
upload.setSizeMax(2000000);
List items = new ArrayList();
try {
items = upload.parseRequest(request);
} catch (FileUploadException e1) {
System.out.println("文件上传发生错误" + e1.getMessage());
}

Iterator it = items.iterator();
while(it.hasNext()){
FileItem fileItem = (FileItem) it.next();
if(fileItem.isFormField()){
System.out.println(fileItem.getFieldName() + "   " + fileItem.getName() + "   " + new String
(fileItem.getString().getBytes("iso8859-1"), "gbk"));
}else{
System.out.println(fileItem.getFieldName() + "   " +
fileItem.getName() + "   " + fileItem.isInMemory() + "    " +
fileItem.getContentType() + "   " + fileItem.getSize());

if(fileItem.getName()!=null && fileItem.getSize()!=0){
File fullFile = new File(fileItem.getName());
File newFile = new File("c:/temp/" + fullFile.getName());
try {
fileItem.write(newFile);
} catch (Exception e) {
e.printStackTrace();
}
}else{
System.out.println("文件没有选择 或 文件内容为空");
}
}

}
}
}

}

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