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;
-
}
-
-
-
-
-
public void login() {
-
try {
-
this.response.setContentType("text/json;charset=utf-8");
-
this.response.setCharacterEncoding("UTF-8");
-
-
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
