java 实现http post multipart/form-data 如何实现! 谢谢了

Question

用java程序如何实现下面的功能! 
注意 文件: <input type=file> 
<form action="http://127.0.0.1/mms_upload.asp" method="post" enctype="multipart/form-data">
账号: <input name=User value=""/><br/>
密码: <input name=Pass type="password" value=""/><br/>
文件: <input type=file name=file /><br/>
<input type=submit value="提交" />
</form>

Answer 1

PrintWriter pw = new PrintWriter(new BufferedWriter(new FileWriter("xxx.xxx"))); 
ServletInputStream in = request.getInputStream(); 
int i = in.read(); 
while (i != -1) { 
  pw.print((char) i); 
  i = in.read(); 
} 
pw.close();
...

Answer 2

request.setCharacterEncoding("gbk");
  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("gbk");
   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");
     }
    }
    
   }
  }

Answer 3

如和用java 程序实现 URLConnection socket

Answer 4

apache有现成的接口:
http://jakarta.apache.org/httpcomponents/httpclient-3.x/