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（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

[java] view
plaincopy

<span style="font-size:18px;color:#999900;">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);

}

};

}</span>

Register.java

[java] view
plaincopy

<span style="font-size:18px;">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);

}

};

}</span>

ExDialog.java

[java] view
plaincopy

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

[java] view
plaincopy

<pre name="code" class="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;

}

}</pre><br>

<pre></pre>

<p></p>

WriteJson.java

<p><span style="font-size:18px"></span></p>

<pre name="code" class="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

*/

}</pre><br>

<br>

<br>

<br>

<br>

<br>

<p></p>

<br>

<pre></pre>

<pre></pre>