使用HTTP客户端从Android的发送序列化对象到一个servlet [英] Sending a serialized object from Android to a servlet using HTTP client

问题描述

我试图创建发送serialzed对象从手机到一个servlet对象的内容是，我将存储在数据库中使用Hibernate用户输入一个Android应用程序。我相信问题是围绕对象的串行化和反串行化的code是如下。如果有人可以帮助我将非常感激。

PS类用户实现Serializable接口

客户端

 公共类adduser的延伸活动实现OnClickListener {

 EditText上的uname;
 的EditText密码;
 的EditText评级;
 的EditText日期;
 按钮添加;
 用户的用户;

    @覆盖
    公共无效的onCreate（包savedInstanceState）{
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.main）;

        的uname =（EditText上）findViewById（R.id.Usernamei）;
        密码=（EditText上）findViewById（R.id.passwordi）;
        等级=（EditText上）findViewById（R.id.ratingi）;
        日期=（EditText上）findViewById（R.id.datei）;
        添加=（按钮）findViewById（R.id.Adduser）;

        用户=新用户（）;



        add.setOnClickListener（本）;

    }

 @覆盖
 公共无效的onClick（视图v）{

  user.setusername（uname.getText（）的toString（））;
        user.setpassword（password.getText（）的toString（））;
        user.setdate（date.getText（）的toString（））;
        user.setrating（rating.getText（）的toString（））;

  HttpClient的HttpClient的=新DefaultHttpClient（）;
  ObjectOutput的了;

  尝试{
    字符串URL =我的网址放在这里;

    HttpPost后=新HttpPost（URL）;


    //对象的序列化
    ByteArrayOutputStream BOS =新ByteArrayOutputStream（）;
       OUT =新的ObjectOutputStream（BOS）;
       out.writeObject（用户）;

       //把字节为对象，它是在HTTP请求的主体
       post.setHeader（新BasicHeader（内容长度，+ bos.toByteArray（）的长度））;

       ByteArrayEntity巴尔=新ByteArrayEntity（bos.toByteArray（））;
       //设置请求的主体
       post.setEntity（巴尔）;

       out.close（）;
       //执行请求，并返回一个响应
       HTT presponse响应= httpClient.execute（后）;

  }赶上（IOException异常E）{
        Log.e（哎哟，!!! IOException异常+ e.getMessage（））;
     }

  uname.setText（将String.valueOf（））;
  password.setText（将String.valueOf（））;
  rating.setText（将String.valueOf（））;
  date.setText（将String.valueOf（））;

 }
}



服务器端

    公共类adduser的延伸的HttpServlet {

 //记录器的属性文件
 //私有静态记录器记录器= Logger.getLogger（Adduser.class）;



 公共无效的doPost（HttpServletRequest的请求，HttpServletResponse的响应）抛出了ServletException {
  //测试
  //logger.warn("this是一个示例日志信息）。


  字符串用户N = NULL;
  字符串password = NULL;
  串等级= NULL;
  字符串日= NULL;

  在的InputStream;
  尝试 {
   //获取HTTP内容主体的字节数组应该是在流
   在= request.getInputStream（）;

   // INT bytesToRead;
   // bytesToRead =的Integer.parseInt（request.getHeader（内容长度））;


   //读取inputream内容写入字节组
   INT读取动作= 0;
   INT bytesToRead = 1024;
   byte []的输入=新的字节[bytesToRead]
   而（读取动作＆LT; bytesToRead）{
     INT结果= in.read（输入，读取动作，bytesToRead  - 读取动作）;
     如果（结果== -1）打破;
     读取动作+ =结果;
   }



   //通过字节数组传递到的ObjectInput流
   ObjectInputStream的客栈=新的ObjectInputStream（新ByteArrayInputStream的（输入））;
   用户用户= NULL;
   尝试 {
    //对象读入用户对象和投
    用户=（用户）inn.readObject（）;
   }赶上（ClassNotFoundException的E1）{
    // TODO自动生成的catch块
    的System.out.println（e1.getMessage（））;

   }
   附寄（）;
   inn.close（）;

   //对象的内容放入变量要传递到数据库
   用户N = users.getusername（）;
   密码= users.getpassword（）;
   等级= users.getrating（）;
   日期= users.getdate（）;

  }赶上（IOException异常E2）{
   // TODO自动生成的catch块
   的System.out.println（e2.getMessage（））;
  }




  会话会话= NULL;

  尝试{
   SessionFactory的SessionFactory的=新配置（）配置（）buildSessionFactory（）。
   会议= sessionFactory.openSession（）;
          //创建联系人的新实例，并设置
   交易TX = session.beginTransaction（）;

      Userr用户=新Userr（）;
      user.setusername（用户N）;
      user.setpassword（密码）;
      user.setrating（等级）;
      user.setdate（日期）;
      的session.save（用户）;

      tx.commit（）;
  }赶上（例外五）{
        的System.out.println（e.getMessage（））;
      }最后{
        //实际接触的插入会发生在这个步骤

        session.flush（）;
        session.close（）;

        }

 }




 }
 

解决方案

作为建议，使用XML或JSON。 你可以得到 XStream的修补Android版的从为了这个博客您的对象序列化到XML。

I have tried to create a android application that sends a serialzed object from the phone to a servlet the contents of the object is the input from the user which i will store in a database using hibernate. I believe the problem is around the serializing and deserializing of the object the code is below. If anyone could help i would very greatful.

p.s the class User implements the serializable interface

client

    public class Adduser extends Activity implements OnClickListener {

 EditText uname;
 EditText password;
 EditText rating;
 EditText date;
 Button add;
 User user;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        uname = (EditText) findViewById(R.id.Usernamei);
        password = (EditText) findViewById(R.id.passwordi);
        rating = (EditText) findViewById(R.id.ratingi);
        date = (EditText) findViewById(R.id.datei);
        add = (Button) findViewById(R.id.Adduser);

        user = new User();



        add.setOnClickListener(this);

    }

 @Override
 public void onClick(View v) {

  user.setusername(uname.getText().toString());
        user.setpassword(password.getText().toString());
        user.setdate(date.getText().toString());
        user.setrating(rating.getText().toString());

  HttpClient httpClient = new DefaultHttpClient();
  ObjectOutput out;

  try{
    String url = "MY URL goes here";

    HttpPost post = new HttpPost(url);


    //Serialisation of object
    ByteArrayOutputStream bos = new ByteArrayOutputStream() ;
       out = new ObjectOutputStream(bos) ;
       out.writeObject(user);

       //puts bytes into object which is the body of the http request
       post.setHeader(new BasicHeader("Content-Length", "" + bos.toByteArray().length));

       ByteArrayEntity barr = new ByteArrayEntity(bos.toByteArray()); 
       //sets the body of the request 
       post.setEntity(barr);

       out.close();
       //executes request and returns a response
       HttpResponse response = httpClient.execute(post); 

  } catch (IOException e) {
        Log.e( "ouch", "!!! IOException " + e.getMessage() );
     }

  uname.setText(String.valueOf(""));
  password.setText(String.valueOf(""));
  rating.setText(String.valueOf(""));
  date.setText(String.valueOf(""));

 }
}



Server side

    public class Adduser extends HttpServlet {

 //logger for properties file
 //private static Logger logger = Logger.getLogger(Adduser.class);



 public void doPost (HttpServletRequest request, HttpServletResponse response) throws ServletException {
  //test
  //logger.warn("this is a sample log message.");


  String usern = null;
  String password = null;
  String rating = null;
  String date = null;

  InputStream in;
  try {
   //gets http content body byte array should be on the stream
   in = request.getInputStream();

   //int bytesToRead;
   //bytesToRead =  Integer.parseInt(request.getHeader("Content-Length"));


   //reads inputream contents into bytearray
   int bytesRead=0;
   int bytesToRead=1024;
   byte[] input = new byte[bytesToRead];
   while (bytesRead < bytesToRead) {
     int result = in.read(input, bytesRead, bytesToRead - bytesRead);
     if (result == -1) break;
     bytesRead += result;
   }



   //passes byte array is passed into objectinput stream 
   ObjectInputStream inn = new ObjectInputStream(new ByteArrayInputStream(input));
   User users = null;
   try {
    //object is read into user object and cast
    users = (User)inn.readObject();
   } catch (ClassNotFoundException e1) {
    // TODO Auto-generated catch block
    System.out.println(e1.getMessage());

   }
   in.close();
   inn.close();

   //contents of object is put into variables to be passed into database
   usern = users.getusername();
   password = users.getpassword();
   rating = users.getrating();
   date = users.getdate();

  } catch (IOException e2) {
   // TODO Auto-generated catch block
   System.out.println(e2.getMessage());
  }




  Session session = null;

  try{
   SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory(); 
   session = sessionFactory.openSession();
          //Create new instance of Contact and set 
   Transaction tx = session.beginTransaction();

      Userr user = new Userr();
      user.setusername(usern);
      user.setpassword(password);
      user.setrating(rating);
      user.setdate(date);
      session.save(user);

      tx.commit();
  }catch(Exception e){
        System.out.println(e.getMessage());
      }finally{
        // Actual contact insertion will happen at this step

        session.flush();
        session.close();

        }

 }




 }

解决方案

As suggested, use XML or JSON. You can get XStream patched for Android from this blog in order to serialize your objects to XML.

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