android与服务器之间数据通信（struts2+JSON+android）

本文主要解决android与服务器之间的数据传递问题

服务器端使用hibernate+struts2架构进行开发

以用户登陆为例：

１.服务器端的配置：

在服务器端部分，主要与android客户端交互的部分就是struts2的action，该action继承ActionSupport类，实现ServletRequestAware，和ServletResponseAware接口。

/** * LoginAction.java [V 1.0.0] *classes:org.action.LoginAction *Create at: 2015年8月19日下午6:45:38 */package org.action.reglog;import java.io.IOException;import java.io.UnsupportedEncodingException;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import net.sf.json.JSONObject;import org.apache.log4j.Logger;import org.apache.struts2.interceptor.ServletRequestAware;import org.apache.struts2.interceptor.ServletResponseAware;import org.model.Users;import org.service.imp.LogRegService;import com.opensymphony.xwork2.ActionSupport;/** * org.action.LoginAction *  * @author xiangdong she Create at:2015年8月19日.下午6:45:38 */public class LoginAction extends ActionSupport implements ServletRequestAware,ServletResponseAware {private final Logger log = Logger.getLogger(LoginAction.class);/** *  */private static final long serialVersionUID = 1L;private HttpServletRequest request;private HttpServletResponse response;/* * (non-Javadoc) *  * @see * org.apache.struts2.interceptor.ServletResponseAware#setServletResponse * (javax.servlet.http.HttpServletResponse) */@Overridepublic void setServletResponse(HttpServletResponse response) {this.response = response;}/* * (non-Javadoc) *  * @see * org.apache.struts2.interceptor.ServletRequestAware#setServletRequest( * javax.servlet.http.HttpServletRequest) */@Overridepublic void setServletRequest(HttpServletRequest request) {this.request = request;}public void login() throws IOException {this.response.setContentType("text/html;charset=utf-8");// 解决post乱码 try { request.setCharacterEncoding("utf-8"); } catch (UnsupportedEncodingException e1) { log.error("encoding error!!!"); e1.printStackTrace(); } String username=request.getParameter("username"); String password=request.getParameter("password");// 解决get乱码//String username = new String(request.getParameter("username").getBytes(//"ISO-8859-1"), "UTF-8");//String password = new String(request.getParameter("password").getBytes(//"ISO-8859-1"), "UTF-8");JSONObject jsonObject = new JSONObject();Users user=null;LogRegService lgService = new LogRegService();try {user=lgService.getUser(username);if (lgService.login(username, password)) {if (lgService.isActivated(username)) {if (lgService.isBind(username)) {request.getSession().setAttribute("username", username);user.setLoginNum(user.getLoginNum()+1);lgService.updateUser(user);jsonObject.put("logmess", "success");

<span style="white-space:pre"></span>//利用JSONobject类进行封装数据，并且传递数据（可以封装类，可以将该action在浏览器中实现，自己查看json//分装类和单独数据的格式）

//例如：<span style="font-family: 'Times New Roman';font-size:14px;">{"username":"username","logmess":"success","user":{"passwd":"passwd","username":"username","loginNum":15,"validateCode":"activated","email":"[e-mail]","userId":7,"tel":"11110000","answer":"answer","gender":true,"realName":"realname</span>

//其中：user就是一个类，而username和logmess是单数的数据jsonObject.put("username", username);jsonObject.put("user", user);//此处需要注意，自己可以实现定义一个用户类} else {jsonObject.put("logmess", "not bind");}} else {jsonObject.put("logmess", "Inactive");}} else {if (lgService.checkUid(username)) {jsonObject.put("logmess", "password error");} else {jsonObject.put("logmess", "user not existed");}}response.getWriter().write(jsonObject.toString());log.info("execute success");} catch (IOException e) {// TODO Auto-generated catch blocklog.error("inner error!");e.printStackTrace();}}}

以上部分就是登录的action类，由于项目业务的需要，所以会做很多逻辑判断，如果自己测试，则可以精简，吧一些ｉｆ｛｝ｅｌｓｅ｛｝语句去掉，写好该类之后，需要在struts.xml文件中说明：

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "struts-2.1.dtd" ><struts><!-- setting encoding,DynamicMethod,language <constant name="struts.custom.i18n.resources" value="messageResource"></constant> --><!-- <constant name="struts.i18n.encoding" value="UTF-8"></constant> --><!-- <constant name="struts.enable.DynamicMethodInvocation" value="true"></constant> -->

<package name="RegLog" <span style="background-color: rgb(255, 0, 0);">extends="json-default"</span> <span style="background-color: rgb(0, 0, 153);">namespace="/reglog"</span>><action name="loginx" class="org.action.reglog.LoginAction"method="login"><span style="color:#ff0000;background-color: rgb(255, 255, 0);"><result type="json" /></span></action><!--<action name="register" class="org.action.reglog.RegistAction"method="register"><result type="json" /></action>--></package></struts>

注：请注意标红的地方，这是使用ｊｓｏｎ封装数据所必要的。也请注意标蓝的地方，包的命名空间在struts２.ｎ之后也是必要的（我忘了是２.几了．．．）．还有标黄的地方，这是返回类型，必须的要。

２.android客户端的配置

private String loginPro() {String username = etUsername.getText().toString();String password = etPassword.getText().toString();JSONObject jsonObject;String result = "failed";Users user=new Users();JSONObject js;try {jsonObject = query(username, password);result = jsonObject.getString("logmess");<span style="background-color: rgb(51, 255, 51);">js=jsonObject.getJSONObject("user");</span>user.setUsername(js.getString("username"));user.setPasswd(js.getString("passwd"));user.setLoginNum(js.getInt("loginNum"));user.setValidateCode(js.getString("validateCode"));user.setEmail(js.getString("email"));user.setUserId(js.getInt("userId"));user.setTel(js.getString("tel"));<span style="background-color: rgb(51, 51, 255);">System.out.println(user.getEmail());</span><span style="background-color: rgb(255, 255, 204);"></span><span style="background-color: rgb(51, 51, 255);">System.out.println(user.getUsername());</span><span style="background-color: rgb(255, 255, 255);"></span><span style="background-color: rgb(51, 51, 255);">System.out.println(user.getLoginNum());</span><span style="background-color: rgb(255, 255, 255);"></span><span style="background-color: rgb(51, 51, 255);">System.out.println(user.getTel());</span><span style="background-color: rgb(255, 255, 255);"></span><span style="background-color: rgb(51, 51, 255);">System.out.println(result);</span><span style="background-color: rgb(255, 255, 255);"></span><span style="background-color: rgb(51, 51, 255);">System.out.println(jsonObject);</span>} catch (Exception e) {DialogUtil.showDialog(Login.this, "服务器响应错误，稍后再试。。", false);}return result;}private JSONObject query(String username, String password) throws Exception {<span style="color:#ff0000;">Map<String, String> map = new HashMap<String, String>();map.put("username", username);map.put("password", password);</span>String url = HttpUtil.BASE_URL + "reglog/loginx.action";String result = HttpUtil.postRequest(url, map);JSONObject jsonObject = new JSONObject(result);Log.d("json中的值", jsonObject.toString());return jsonObject;}private boolean validate() {String username = etUsername.getText().toString().trim();String password = etPassword.getText().toString().trim();if (username.equals("")) {DialogUtil.showDialog(this, "用户名是必填项", false);return false;}if (password.equals("")) {DialogUtil.showDialog(this, "密码必填", false);}return true;}}

注：绿色部分是使用JSONobject类接受user类，之后对user的属性进行注入。蓝色部分是对接受到的数据的输出检验。红色部分就是在传输之前，将数据以ｍａｐ的方式进行封装，以便于调用以下类的post方法，进行诗句发送。

要用到的数据发送的基本方法：分别使用ｇｅｔ和post方法发送数据

package com.client.util;import java.util.ArrayList;import java.util.List;import java.util.Map;import java.util.concurrent.Callable;import java.util.concurrent.FutureTask;import org.apache.http.HttpResponse;import org.apache.http.NameValuePair;import org.apache.http.client.HttpClient;import org.apache.http.client.entity.UrlEncodedFormEntity;import org.apache.http.client.methods.HttpGet;import org.apache.http.client.methods.HttpPost;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.message.BasicNameValuePair;import org.apache.http.util.EntityUtils;import android.util.Log;public class HttpUtil {public static HttpClient httpClient = new DefaultHttpClient();public static final String BASE_URL = "http://113.251.216.196:8080/JavaWebStruct/";public static String getRequest(final String url) throws Exception {Log.d("执行getRequest方法", "开始执行");FutureTask<String> task = new FutureTask<String>(new Callable<String>() {@Overridepublic String call() throws Exception {HttpGet get = new HttpGet(url);HttpResponse response = httpClient.execute(get);if (response.getStatusLine().getStatusCode() == 200) {String result = EntityUtils.toString(response.getEntity());return result;}return null;}});new Thread(task).start();return task.get();}public static String postRequest(final String url,final Map<String, String> rawParams) throws Exception{Log.d("执行postRequest方法", "开始执行");FutureTask<String> task=new FutureTask<String>(new Callable<String>() {@Overridepublic String call() throws Exception {HttpPost post=new HttpPost(url);List<NameValuePair> params=new ArrayList<NameValuePair>();for (String key : rawParams.keySet()) {params.add(new BasicNameValuePair(key, rawParams.get(key)));}post.setEntity(new UrlEncodedFormEntity(params,"utf-8"));Log.d("执行postRequest方法", "执行到中间");HttpResponse response=httpClient.execute(post);if (response.getStatusLine().getStatusCode()==200) {String result=EntityUtils.toString(response.getEntity());Log.d("entityUtils返回值", result);return result;}return null;}});new Thread(task).start();Log.d("执行postRequest方法", "执行结束");return task.get();}}

其中用到的一个显示控件的通用方法：

package com.client.util;import com.example.androidtest.Success;import android.app.AlertDialog;import android.content.Context;import android.content.DialogInterface;import android.content.Intent;import android.view.View;import android.content.DialogInterface.OnClickListener;public class DialogUtil {public static void showDialog(final Context ctx, String msg, boolean goHome) {AlertDialog.Builder builder = new AlertDialog.Builder(ctx).setMessage(msg).setCancelable(false);if (goHome) {builder.setPositiveButton("确定", new OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {Intent intent = new Intent(ctx, Success.class);intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);}});} else {builder.setPositiveButton("确定", null);}builder.create().show();}public static void showDialog(Context ctx, View view) {new AlertDialog.Builder(ctx).setView(view).setCancelable(false).setPositiveButton("确定", null).create().show();}}

编码不是问题，问题也不是问题，主要问题是思路要清晰。。。。。。

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