Android+struts2+json方式模拟手机登录功能详解编程语言

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=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

原创文章，作者：奋斗，如若转载，请注明出处：https://blog.ytso.com/tech/pnotes/13089.html

Android+struts2+json方式模拟手机登录功能详解编程语言

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