用输入输出流开启连接，添加参数,然后获取参数值 + 向一个文件中写入内容 + 从文件中读出内容 + 从缓冲读入流中读取内容然后处理

 

/**
 - 用输入输出流开启连接，添加参数,然后获取参数值
 - 向一个文件中写入内容
 - 从文件中读出内容
 - 从缓冲读入流中读取内容然后处理
*/

//用输入输出流开启连接，添加参数,然后获取参数值 

 

 URL url = new URL(fileDownloadPath);
	URLConnection connection = url.openConnection();
	connection.setDoOutput(true);
	
	PrintWriter outStream = new PrintWriter(connection.getOutputStream());
	outStream.print("username=" + username);//hkaws_file_download
	outStream.print("&password=" + password);//12345678
	outStream.print("&xml=" + xml); //<?xml version="1.0" encoding="UTF-8" ?>
		
	outStream.print("&source=" + PrintInfo.SOURCE_WEB);//WEB
	outStream.print("&token=" + token);//0
	outStream.print("&queue_category=" + queueCategory); // LABEL
	outStream.print("&agent_code=" + agentCode);//300693
	outStream.close();
	InputStream in = connection.getInputStream(); ==> jump to print_label_now.jsp

String newUsername = request.getParameter("username");
    String newPassword = request.getParameter("password");
    String source = request.getParameter("source");
    String token = request.getParameter("token");
    String xml = request.getParameter("xml");
    String queueCategory = request.getParameter("queue_category");
    String agentCode = request.getParameter("agent_code");
    if (agentCode == null && xml != null && !"".equals(xml)) {
        agentCode = getValueByAttribute(xml, "agent_code");
    }

--------------------------------
//向一个文件中写入内容
 public void generateFeed() throws IOException{
		ArrayList result = generateLines();
		FileWriter writer = new FileWriter(filePath,false);
		PrintWriter pw = new PrintWriter(writer);
		for (int i=0;i<result.size();i++){
			String line = (String)result.get(i);
			pw.println(line);
			//dos.writeChars(line);
		}
		pw.close();
		writer.close();
	}
	//向一个文件中写入内容
	FileOutputStream out = new FileOutputStream(logFileName);
  PrintWriter log = new PrintWriter(out);
  String line = "";
  String errMsg = "";
	log.write((new Date()).toString() + " ERROR in uploading report(" + reportUploaderVO.getFileName() 
                         + ", AgentCode : " + reportUploaderVO.getAgentCode() + ")\n");
  log.write((new Date()).toString() + " " + errMsg);
  log.close();
  //写入对象到一个文件
ObjectOutputStream feed = new ObjectOutputStream(new FileOutputStream(noteFile));
                  feed.writeObject(paReports);
                  feed.close();
        
  //从一个文件中读出对象
String feedFileName = args[0];
String logFileName = args[1];
ObjectInputStream in = new ObjectInputStream(new FileInputStream(feedFileName));
ArrayList arrayList = (ArrayList)in.readObject();
File file = new File(logFileName);
if (file.exists()){
    file.delete();
}

sql.delete(0, sql.length());
----------------------------------------------------

BufferedReader br = new BufferedReader(new FileReader(agentFeedPath));
 while ((line = br.readLine()) != null){
   if (line.startsWith("HEADER") || line.startsWith("TRAILER"))
      continue;
	  agentCode = line.substring(0, 6).trim();
	  agent = new AgentIdentification();
	  agent.setAgentCode(agentCode);
	  agent.setAgentName(line.substring(6, 36).trim());
	  agent.setUnitCode(line.substring(36, 41).trim());
	  agent.setBranchCode(line.substring(41, 46).trim());
	  agent.setBranchHead(line.substring(46, 76).trim());
	  agent.setBranchName(line.substring(76, 106).trim());
	  agent.setAgentEmail(line.substring(106, 166).trim());
	  if (cond == BY_AGENT){
	      agentTable.put(agentCode, agent);
	  }
   branch = (AgentIdentification)agentTable.get(agent.getBranchCode());
}