java 序列化的作用

public class Test {

    public static String requestUrl = "http://localhost/SpringMvc/test.do";
    public static void main(String[] args) {
        TestVo test = new TestVo();
        test.setName("baichuanyu");
        test.setAge(20);
        HttpURLConnection httpUrlConn = null;
        InputStream inputStream = null;
        InputStreamReader inputStreamReader = null;
        BufferedReader bufferedReader = null;
        ObjectOutputStream oos = null;
        StringBuffer buffer = new StringBuffer();
        try
        {
          URL url = new URL(requestUrl);
          httpUrlConn = (HttpURLConnection)url.openConnection();
          // 设置content_type=SERIALIZED_OBJECT
          // 如果不设此项,在传送序列化对象时,当WEB服务默认的不是这种类型时可能抛java.io.EOFException
          httpUrlConn.setRequestProperty("Content-Type","application/x-java-serialized-object");
          httpUrlConn.setConnectTimeout(10000);
          httpUrlConn.setReadTimeout(10000);
          // 设置是否向httpUrlConn输出，因为是post请求，参数要放在http正文内，因此需要设为true, 默认情况下是false
          httpUrlConn.setDoOutput(true);
          // 设置是否从httpUrlConn读入，默认情况下是true
          httpUrlConn.setDoInput(true);
          // 不使用缓存
          httpUrlConn.setUseCaches(false);

          // 设置请求方式，默认是GET
          httpUrlConn.setRequestMethod("POST");
          httpUrlConn.connect();

          if (test != null)
          {
            // 此处getOutputStream会隐含的进行connect，即：如同调用上面的connect()方法，
            // 所以在开发中不调用上述的connect()也可以，不过建议最好显式调用
            // write object(impl Serializable) using ObjectOutputStream
            oos = new ObjectOutputStream(httpUrlConn.getOutputStream());
            oos.writeObject(test);
            oos.flush();
            // outputStream不是一个网络流，充其量是个字符串流，往里面写入的东西不会立即发送到网络，
            // 而是存在于内存缓冲区中，待outputStream流关闭时，根据输入的内容生成http正文。所以这里的close是必须的
            oos.close();
          }
          // 将返回的输入流转换成字符串
          // 无论是post还是get，http请求实际上直到HttpURLConnection的getInputStream()这个函数里面才正式发送出去
          inputStream = httpUrlConn.getInputStream();//注意，实际发送请求的代码段就在这里
          inputStreamReader = new InputStreamReader(inputStream, "UTF-8");
          bufferedReader = new BufferedReader(inputStreamReader);

          String str = null;
          while ((str = bufferedReader.readLine()) != null)
          {
            buffer.append(str);
          }
        }
        catch (Exception e)
        {
          System.out.println(e);
        }
        finally
        {
          try
          {
              bufferedReader.close();
              inputStreamReader.close();
              inputStream.close();
              oos.close();
            if (httpUrlConn != null)
            {
              httpUrlConn.disconnect();
            }
          }
          catch (Exception e)
          {
          }
        }

    }
}

网络传输：通过推送改变网站中比如map中存储的对象

@RequestMapping(value = "/test", method = RequestMethod.POST)
    public void javaSerialize(HttpServletResponse response,HttpServletRequest request) {
        try {
            ObjectInputStream ois = new ObjectInputStream(request.getInputStream());
            TestVo user = (TestVo) ois.readObject();
            System.out.println(user.getName()+":"+user.getAge());
            map.put("user", user);
            PrintWriter w = response.getWriter();
                    w.print("已收到");
                    w.flush();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }