Android客户端与服务器端的json数据交互（很详细）

      Android客户端与服务器端的json数据交互，主要是通过json形式的数据交互，就是json的写入和解析。

 先看效果图，我最讨厌讲东西，一个图没有的。

算了，看来我不是写博客的材料，写不下去了，要排版之类的麻烦，大家还是直接去下载源码，里面有大量的注视，应该能看懂。 下载地址：源码下载地址

登录界面：很传统的随便做了一下：

用的是android4.0的，别人说这样的EditText很有科技感。

注册界面：

也是很传统的，文本框之类的 。

下面看看包名，类名图。（忙着和比人聊天了，差点忘了） 现在继续

客户端的：

服务器端的：

下面贴上客户端的代码：

LoginRegisterActivity.java

package com.gem.hsx.activity;

import com.gem.hsx.operation.Operaton;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

//此为主activity的实现登录的。在android2.3以后，android规定了主activity不允许在主线程中做一些耗时较多的
//操作，包括网络的操作，主要是减少应用程序停止响应的问题。下面注释掉的部分是网上找到的方法，加上之后就可以在主线程中
//进行联网操作了，但是本人采用了线程的操作，未采用该方法
public class LoginRegisterActivity extends Activity {
Button login;
Button register;
EditText etusername;
EditText etpassword;
String username;
String password;
ProgressDialog p;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

//StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()       
//.detectDiskReads()       
//.detectDiskWrites()       
//.detectNetwork()   // or .detectAll() for all detectable problems       
//.penaltyLog()       
//.build());       
//StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder()       
//.detectLeakedSqlLiteObjects()    
//.penaltyLog()       
//.penaltyDeath()       
//.build());   



init();
register.setOnClickListener(new RegisterOnclick());
login.setOnClickListener(new LoginOnclick());
}
private void init() 
{
etusername=(EditText) findViewById(R.id.etusername);
etpassword=(EditText) findViewById(R.id.etpassword);
login=(Button) findViewById(R.id.login);
register=(Button) findViewById(R.id.register);
p=new ProgressDialog(LoginRegisterActivity.this);
p.setTitle("登录中");
p.setMessage("登录中，马上就好");
}
private class RegisterOnclick implements OnClickListener
{
public void onClick(View v) {
Intent intent=new Intent();
intent.setClass(LoginRegisterActivity.this, Register.class);
startActivity(intent);
}

}
private class LoginOnclick implements OnClickListener
{
public void onClick(View arg0) {
username=etusername.getText().toString().trim();
if (username==null||username.length()<=0) 
{
etusername.requestFocus();
etusername.setError("对不起，用户名不能为空");
return;
}
else 
{
username=etusername.getText().toString().trim();
}
password=etpassword.getText().toString().trim();
if (password==null||password.length()<=0) 
{
etpassword.requestFocus();
etpassword.setError("对不起，密码不能为空");
return;
}
else 
{
password=etpassword.getText().toString().trim();
}
p.show();
new Thread(new Runnable() {

public void run() {
Operaton operaton=new Operaton();
String result=operaton.login("Login", username, password);
Message msg=new Message();
msg.obj=result;
handler.sendMessage(msg);
}
}).start();

}
}
Handler handler=new Handler(){
@Override
public void handleMessage(Message msg) {
String string=(String) msg.obj;
p.dismiss();
Toast.makeText(LoginRegisterActivity.this, string, 0).show();
super.handleMessage(msg);
}
};

}

Register.java

package com.gem.hsx.activity;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import com.gem.hsx.bean.User;
import com.gem.hsx.json.WriteJson;
import com.gem.hsx.operation.Operaton;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnFocusChangeListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.RadioButton;
import android.widget.Toast;


public class Register extends Activity {
Button submit;
Button select;
EditText etusername;
EditText etpassword;
RadioButton ckman;
RadioButton ckwoman;
EditText etage;
ImageView imgphoto;
String str;
String filepath=null;
String jsonString=null;
ProgressDialog dialog;
private static final int REQUEST_EX = 1;
String username=null;
String password=null;
String sex=null;
String age=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.register);
init();
//etusername.addTextChangedListener(new MyTextWatcher());
etusername.setOnFocusChangeListener(new EtusernameOnFocusChange());
select.setOnClickListener(new SelectOnclick());
submit.setOnClickListener(new SubmitOnclick());
}
private void init()
{
submit=(Button) findViewById(R.id.submit);
select=(Button) findViewById(R.id.select);
etusername=(EditText) findViewById(R.id.etusername);
etpassword=(EditText) findViewById(R.id.etpassword);
ckman=(RadioButton) findViewById(R.id.ckman);
ckwoman=(RadioButton) findViewById(R.id.ckwoman);
etage=(EditText) findViewById(R.id.etage);
imgphoto=(ImageView) findViewById(R.id.imgphoto);
dialog=new ProgressDialog(Register.this);
dialog.setTitle("上传数据中");
dialog.setMessage("请稍等...");
}

//private   class MyTextWatcher implements TextWatcher
//{
//
//public void afterTextChanged(Editable s) {
// str=etusername.getText().toString().trim();
// if (str==null||str.length()<=0) 
// {
//etusername.setError("用户名不能为空");
// }
// else 
// {
// new Thread(new Runnable() {
//
//public void run() {
// Operaton operaton=new Operaton();
// String result= operaton.checkusername("Check", str);
// Message message=new Message();
// message.obj=result;
// handler.sendMessage(message);
//}
//}).start();
// 
//   
//  }
//}
//public void beforeTextChanged(CharSequence s, int start, int count,
//int after) {
//
//}
//
//public void onTextChanged(CharSequence s, int start, int before,
//int count) {
//
//}
//
//}
//Handler handler=new Handler()
//{
//@Override
//public void handleMessage(Message msg) {
//String msgobj=msg.obj.toString();
//if (msgobj=="该用户名可用") 
//{
//etusername.setFocusable(false);
//}
//else 
//{
//etusername.requestFocus();
//etusername.setError(msgobj);
//}    
//super.handleMessage(msg);
//}
//};
//
private class EtusernameOnFocusChange implements OnFocusChangeListener
{
public void onFocusChange(View v, boolean hasFocus) {
if (!etusername.hasFocus()) {
str=etusername.getText().toString().trim();
if (str==null||str.length()<=0) 
{
etusername.setError("用户名不能为空");
}
else 
{
new Thread(new Runnable() {
                 //如果用户名不为空，那么将用户名提交到服务器上进行验证，看用户名是否存在，就像JavaEE中利用
//ajax一样，虽然你看不到但是它却偷偷摸摸做了很多
public void run() {
Operaton operaton=new Operaton();
String result= operaton.checkusername("Check", str);
System.out.println("result:"+result);
Message message=new Message();
message.obj=result;
handler.sendMessage(message);
}
}).start();
}
}
}
}
Handler handler=new Handler()
{
@Override
public void handleMessage(Message msg) {
String msgobj=msg.obj.toString();
System.out.println(msgobj);
System.out.println(msgobj.length());

if (msgobj.equals("t")) {  
etusername.requestFocus();
etusername.setError("用户名"+str+"已存在");
}
else 
{
etpassword.requestFocus();
}
super.handleMessage(msg);
}
};
private class SelectOnclick implements OnClickListener
{
public void onClick(View v) {

Intent intent = new Intent();
intent.putExtra("explorer_title",
getString(R.string.dialog_read_from_dir));
intent.setDataAndType(Uri.fromFile(new File("/sdcard")), "*/*");
intent.setClass(Register.this, ExDialog.class);
startActivityForResult(intent, REQUEST_EX);
}
}
protected void onActivityResult(int requestCode, int resultCode,
Intent intent) {
if (resultCode == RESULT_OK) {

Uri uri = intent.getData();
filepath=uri.toString().substring(6);
System.out.println(filepath);
//用户的头像是不是图片格式
if(filepath.endsWith("jpg")||filepath.endsWith("png"))
{
File file=new File(filepath);
try {
InputStream inputStream=new FileInputStream(file);
Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
imgphoto.setImageBitmap(bitmap);//如果是就将图片显示出来
} catch (FileNotFoundException e) {
e.printStackTrace();
}
submit.setClickable(true);
}
else
{
submit.setClickable(false);
alert();
}

}
}

private class SubmitOnclick implements OnClickListener
{
public void onClick(View v) {
username=etusername.getText().toString().trim();
password=etpassword.getText().toString().trim();

if (ckman.isChecked()) {
sex="男";
}
else {
sex="女";
}
age=etage.getText().toString().trim();
if (age==null||age.length()<=0) 
{  
etage.requestFocus();
etage.setError("年龄不能为空");
return ;
}

dialog.show();
new Thread(new Runnable() {

public void run() {

Operaton operaton=new Operaton();
File file=new File(filepath);
String photo=operaton.uploadFile(file, "ImgReciver");
//先进行图片上传的操作，然后服务器返回图片保存在服务器的路径，
System.out.println("photo---->"+photo);
System.out.println("sex:------>"+sex);
User user=new User(username, password, sex, age,photo);
//构造一个user对象
List<User> list=new ArrayList<User>();
list.add(user);
WriteJson writeJson=new WriteJson();
//将user对象写出json形式字符串
jsonString= writeJson.getJsonData(list);
                    System.out.println(jsonString); 
String result= operaton.UpData("Register", jsonString);
Message msg=new Message();
System.out.println("result---->"+result);
msg.obj=result;
handler1.sendMessage(msg);
}
}).start();

}
}
private void alert()
{
Dialog dialog = new AlertDialog.Builder(this)
.setTitle("提示")
.setMessage("您选择的不是有效的图片")
.setPositiveButton("确定",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
filepath = null;
}
})
.create();
dialog.show();
}
Handler handler1=new Handler()
{
@Override
public void handleMessage(Message msg) {
dialog.dismiss();
String msgobj=msg.obj.toString();
if(msgobj.equals("t"))
{
Toast.makeText(Register.this, "注册成功", 0).show();
Intent intent=new Intent();
intent.setClass(Register.this, LoginRegisterActivity.class);
startActivity(intent);
}
else {
Toast.makeText(Register.this, "注册失败", 0).show();
}
super.handleMessage(msg);
}
};
}

ExDialog.java

package com.gem.hsx.activity;


import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;


import android.app.ListActivity;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.Display;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.view.WindowManager.LayoutParams;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;


import com.gem.hsx.activity.R;
//由于安卓模拟器里面没有文件浏览器，所以构建一个文件浏览器的对话框 主要是dialog和listview配合
//此是一个简单的浏览器主要目的是选择文件后获取文件的路径，借鉴了一些其他人的文件浏览器的写法
public class ExDialog extends ListActivity {
private List<Map<String, Object>> mData;
private String mDir = "/sdcard";


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);


Intent intent = this.getIntent();
Bundle bl = intent.getExtras();
String title = bl.getString("explorer_title");
Uri uri = intent.getData();
mDir = uri.getPath();


setTitle(title);
mData = getData();
MyAdapter adapter = new MyAdapter(this);
setListAdapter(adapter);


WindowManager m = getWindowManager();
Display d = m.getDefaultDisplay();
LayoutParams p = getWindow().getAttributes();
p.height = (int) (d.getHeight() * 0.8);
p.width = (int) (d.getWidth() * 0.95);
getWindow().setAttributes(p);
}


private List<Map<String, Object>> getData() {
List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
Map<String, Object> map = null;
File f = new File(mDir);
File[] files = f.listFiles();


if (!mDir.equals("/sdcard")) {
map = new HashMap<String, Object>();
map.put("title", "返回上一级目录/");
map.put("info", f.getParent());
map.put("img", R.drawable.ex_folder);
list.add(map);
}
if (files != null) {
for (int i = 0; i < files.length; i++) {
map = new HashMap<String, Object>();
map.put("title", files[i].getName());
map.put("info", files[i].getPath());
if (files[i].isDirectory())
map.put("img", R.drawable.ex_folder);
else
map.put("img", R.drawable.ex_doc);
list.add(map);
}
}
return list;
}


@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
Log.d("MyListView4-click", (String) mData.get(position).get("info"));
if ((Integer) mData.get(position).get("img") == R.drawable.ex_folder) {
mDir = (String) mData.get(position).get("info");
mData = getData();
MyAdapter adapter = new MyAdapter(this);
setListAdapter(adapter);
} else {
finishWithResult((String) mData.get(position).get("info"));
}
}


public final class ViewHolder {
public ImageView img;
public TextView title;
public TextView info;
}


public class MyAdapter extends BaseAdapter {
private LayoutInflater mInflater;


public MyAdapter(Context context) {
this.mInflater = LayoutInflater.from(context);
}


public int getCount() {
return mData.size();
}


public Object getItem(int arg0) {
return null;
}


public long getItemId(int arg0) {
return 0;
}


public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (convertView == null) {
holder = new ViewHolder();
convertView = mInflater.inflate(R.layout.listview, null);
holder.img = (ImageView) convertView.findViewById(R.id.img);
holder.title = (TextView) convertView.findViewById(R.id.title);
//holder.info = (TextView) convertView.findViewById(R.id.info);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}


holder.img.setBackgroundResource((Integer) mData.get(position).get(
"img"));
holder.title.setText((String) mData.get(position).get("title"));
//holder.info.setText((String) mData.get(position).get("info"));
return convertView;
}
}


private void finishWithResult(String path) {
Bundle conData = new Bundle();
conData.putString("results", "Thanks Thanks");
Intent intent = new Intent();
intent.putExtras(conData);
Uri startDir = Uri.fromFile(new File(path));
intent.setDataAndType(startDir,
"vnd.android.cursor.dir/lysesoft.andexplorer.file");
setResult(RESULT_OK, intent);
finish();
}
};

JsonUtil.java

package com.gem.hsx.json;


import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;




public class JsonUtil {
public List<?> StringFromJson (String jsondata)
{     
Type listType = new TypeToken<List<?>>(){}.getType();
Gson gson=new Gson();
ArrayList<?> list=gson.fromJson(jsondata, listType);
return list;


}
}
WriteJson.java
package com.gem.hsx.json;

import java.util.List;
import com.google.gson.Gson;

public class WriteJson {
/*
 * 通过引入gson jar包 写入 json 数据
 */
public String getJsonData(List<?> list)
{
//此处要注意，时常会出现说找不到Gson类的情况，这时我们只需要将导入的包和系统提供换换顺序就行了
Gson gson=new Gson();//利用google提供的gson将一个list集合写成json形式的字符串
String jsonstring=gson.toJson(list);
return jsonstring;
}
/*
 * 当然如果不用gson也可以用传统的方式进行写入json数据或者利用StringBuffer拼字符串 写成json字符串形式
 */
}