Android+struts2+json方式模拟手机登录功能

涉及到的知识点：

1.Struts2框架的搭建(包括Struts2的jSON插件)

2.Android前台访问Web采用HttpClient方式。

3.Android采用JSON的解析。

服务端主要包含一个Action，通过struts的web配置配置struts.xml驱动业务逻辑的执行，然后对于符合条件的登录，返回给客户端通过jsonobject包装的数据。

服务端代码：

package com.easyway.json.android;

import java.util.HashMap;

import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.interceptor.ServletRequestAware;

import org.apache.struts2.interceptor.ServletResponseAware;

import com.opensymphony.xwork2.ActionSupport;

/** * 模拟登录，并返回json数据 @author xiangzhihong

*/

public class LoginAction extends ActionSupport implements ServletRequestAware,

ServletResponseAware {

/** * */

private static final long serialVersionUID = 1L;

HttpServletRequest request;

HttpServletResponse response;

private String userName;

private String password;

public String getPassword() {

return password;

}

public void setPassword(String password) {

this.password = password;

}

public String getUserName() {

return userName;

}

public void setUserName(String userName) {

this.userName = userName;

}

public void setServletRequest(HttpServletRequest request) {

this.request = request;

}

public void setServletResponse(HttpServletResponse response) {

this.response = response;

}

/**

* 模拟用户登录的业务

*/

public void login() {

try {

this.response.setContentType("text/json;charset=utf-8");

this.response.setCharacterEncoding("UTF-8");

//JSONObject json=new JSONObject();

Map<String,String> <span style="color: #ff0000;">json</span>=new HashMap<String,String>();

if ("admin".equals(userName)&&"123456".equals(password)) {

json.put("message", "欢迎管理员登陆");

} else if ((!"admin".equals(userName))&&"123456".equals(password)) {

json.put("message", "欢迎"+userName+"登陆！");

} else {

json.put("message", "非法登陆信息！");

}

byte[] jsonBytes = json.toString().getBytes("utf-8");

response.setContentLength(jsonBytes.length);

response.getOutputStream().write(jsonBytes);

response.getOutputStream().flush();

response.getOutputStream().close();

} catch (Exception e) {

e.printStackTrace();

}

}

}

接下来是客户端代码，用AsyncHttpClient进行网络的请求，如果包含我返回的json字符串的标志，我认为访问成功
客户端代码：

package xzh.com.listviewhover.ui;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.os.StrictMode;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.AsyncHttpResponseHandler;

import butterknife.ButterKnife;
import butterknife.InjectView;
import butterknife.OnClick;
import xzh.com.listviewhover.R;
import xzh.com.listviewhover.base.Constants;

/**
* Created by xiangzhihong on 2016/3/14 on 12:07.
* 测试服务端的登录json
*/
public class LoginActivity extends AppCompatActivity {
@InjectView(R.id.account)
EditText account;
@InjectView(R.id.pwd)
EditText pwd;
@InjectView(R.id.login)
Button login;

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
initProxy();
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
ButterKnife.inject(this);
initView();
}

private void initProxy() {
StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
.detectDiskReads()
.detectDiskWrites()
.detectNetwork()
.penaltyLog()
.build());
//设置虚拟机的策略
StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder()
.detectLeakedSqlLiteObjects()
.penaltyLog()
.penaltyDeath()
.build());
}

private void initView() {
}

@OnClick(R.id.login)
void loginClick(View v){
String userName=account.getText().toString();
String password=pwd.getText().toString();
doLogin(userName,password);
}

private void doLogin(String userName, String password) {
final String[] result = {null};
String reqUrl=null;
reqUrl= Constants.LOGIN_URL+"userName="+userName+"&password="+password;
try {
doHttp(result, reqUrl);
AlertDialog.Builder builder=new AlertDialog.Builder(this);
builder.setTitle("提示")
.setMessage(result[0])
.setPositiveButton("确定", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
startActivity(new Intent(LoginActivity.this,MainActivity.class));
}
}).setNegativeButton("取消",new DialogInterface.OnClickListener(){

@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
}).create().show();

}  catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

private void doHttp(final String[] result, String reqUrl) {

//            HttpClient httpclient = new DefaultHttpClient();
//            HttpGet request=new HttpGet(reqUrl);
//            request.addHeader("Accept","text/json");
//            HttpResponse response =httpclient.execute(request);
//            HttpEntity entity=response.getEntity();
//            String json = EntityUtils.toString(entity,"UTF-8");
//            if(json!=null&&json.contains("message")){
////                JSONObject jsonObject=new JSONObject(json);
////                result=jsonObject.get("message").toString();
//                result="登录成功";
//            }else {
//              result="登录失败请重新登录";
//            }

AsyncHttpClient client = new AsyncHttpClient();
client.get(this,reqUrl,new AsyncHttpResponseHandler(){
@Override
public void onSuccess(String content) {
super.onSuccess(content);
if (content!=null&&content.contains("message")){
result[0] ="登录成功";
}else {
result[0] ="登录失败";
}
}
});
}
}

好了，就到这，有需要的需要体验的请到我的git账号下载测试程序。

服务端代码：https://github.com/xiangzhihong/login

客户端代码：https://github.com/xiangzhihong/loginAndroid