通過前兩天的開發，已經實現了應用的註冊登錄功能，考慮到後面主功能的測試需要，所以今天優先處理一下退出登錄的功能
- 創建賬號管理的頁面——activity_account_manage.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:background="#eeeeee"> <LinearLayout android:background="@color/white" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <ImageView android:id="@+id/account_images_head" android:layout_width="80dp" android:layout_height="80dp" android:layout_marginBottom="10dp" android:layout_marginLeft="10dp" android:layout_marginRight="10dp" android:layout_marginTop="10dp" android:scaleType="fitCenter" android:src="@drawable/tab_icon_one"/> <LinearLayout android:id="@+id/account_login_top" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_weight="1" android:orientation="vertical" android:weightSum="1" > <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_gravity="center" android:layout_marginTop="20dp" android:layout_weight="0.3" android:orientation="horizontal"> <TextView android:id="@+id/account_textView8" android:layout_width="70dp" android:layout_height="wrap_content" android:text="暱稱：" android:textSize="18sp"/> <TextView android:id="@+id/account_t_name" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight="1" android:text="丫an梅" android:textSize="18sp" android:textStyle="bold"/> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight="0.3" android:orientation="horizontal"> <TextView android:id="@+id/account_textView9" android:layout_width="70dp" android:layout_height="wrap_content" android:text="狀態：" android:textSize="18sp"/> <TextView android:id="@+id/account_t_status" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight="0.44" android:text="已登錄" android:textSize="18sp" android:textStyle="bold"/> </LinearLayout> </LinearLayout> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent"> <Button android:id="@+id/account_bt_out_login" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="20dp" android:layout_marginLeft="100dp" android:layout_marginRight="100dp" android:background="@drawable/selector_loginactivity_button" android:text="退出登錄" android:textColor="#fff" android:gravity="center" /> </LinearLayout> </LinearLayout>
2. 創建AccountManagement.java，處理賬號管理頁面的邏輯
- 獲取到當前登錄用戶的頭像和暱稱信息——數據爲測試數據尚未和數據庫同步
- 處理退出登錄按鈕的事件，更改用戶的登錄狀態並更新“我的”頁面中的UI
- 登錄成功之後返回發現頁
package com.example.discover; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.content.SharedPreferences; import android.graphics.Bitmap; import android.os.Bundle; import android.os.Handler; import android.view.View; import android.widget.Button; import android.widget.ImageView; import android.widget.TextView; import android.widget.Toast; import java.io.IOException; public class AccountManagement extends Activity { ImageView my_head_img; //用戶頭像 TextView my_name,status; //用戶暱稱和心情 Button out_login; //退出登錄 String imgBaseUrl = "http://10.0.2.2:8080/iShareService/images/"; //圖片資源 String userName,headImg; //存放用戶基本信息 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_account_manage); my_head_img = (ImageView)findViewById(R.id.account_images_head); //我的頭像 my_name = (TextView)findViewById(R.id.account_t_name); //我的暱稱 status = (TextView)findViewById(R.id.account_t_status); //登錄狀態 out_login = (Button)findViewById(R.id.account_bt_out_login) ;//退出登錄的按鈕 setBaseInfo(); out_login.setOnClickListener(new onClick()); } class onClick implements View.OnClickListener { @Override public void onClick(View v) { exitSuccess(); Toast.makeText(AccountManagement.this, "退出成功！", Toast.LENGTH_LONG).show(); //通過handler設置延時兩秒後執行r任務，跳轉到首頁 new Handler().postDelayed(new AccountManagement.LoadMainTask(),1000); } } //啓動線程,加載主頁 private class LoadMainTask implements Runnable{ @Override public void run() { Intent intent = new Intent(AccountManagement.this,MainActivity.class); startActivity(intent); //打開主頁 finish(); //關閉起始頁 } } //退出登錄後進行用戶登錄狀態修改 public void exitSuccess(){ //退出登錄後更改登錄狀態 SharedPreferences sp = AccountManagement.this.getSharedPreferences("save", Context.MODE_PRIVATE); SharedPreferences.Editor editor = sp.edit(); editor.putBoolean("isLogin", false); editor.putString("name", ""); editor.putString("sign", ""); editor.putString("img", ""); editor.commit(); } //設置賬號管理頁面用戶相關信息 public void setBaseInfo(){ //獲取最新的登錄狀態，SharePreferences爲永久存儲，需要手動退出 SharedPreferences sp = AccountManagement.this.getSharedPreferences("save", Context.MODE_PRIVATE); //boolean isLogin = sp.getBoolean("isLogin",false); //第一版本不做登錄判斷，在跳轉前要求登錄狀態才能夠跳轉到這個頁面 status.setText("已登錄"); Bitmap one; //用於獲取網絡圖片 userName = sp.getString("name",""); headImg = sp.getString("headImg",""); //設置用戶暱稱、頭像 my_name.setText(userName); //通過網絡鏈接獲取圖片 try { one= LoadImgByNet.getBitmap(imgBaseUrl+"my_tab_list1.png"); my_head_img.setImageBitmap(one); //設置用戶頭像 }catch(IOException e){ e.printStackTrace(); } } }
3. 在數據庫ishare中創建分享的內容表info
- 字段包括info_id（自增的內容ID）、info_title（內容標題）、info_descibe（內容簡述）、info_detail（內容詳情）、info_type（內容類型，0表示日記，1表示趣事）、info_support（點贊數）、username（作者）
4.在myeclipse的myServlet.data包下創建QueryDiscover.java文件，用於查詢info表中的數據
- 爲了將返回的rowSet數據打包爲Json格式，需要在lib中引入json-lib-2.4-jdk15.jar以及相關聯的jar包ezmorph-1.0.4、commons-logging-1.1.1、commons-lang-2.4、commons-collections-3.2、commons-beanutils-1.8.0
- 在org.utils包下創建JsonUtils.java，代碼如下
package org.utils;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import java.util.List;
import java.util.Map;public class JsonUtils {
public static JSONArray formatRsToJsonArray(List<Map<String,Object>> data){
JSONArray jsonArray = new JSONArray();//存放返回的jsonOjbect數組
for(Map<String,Object> rowItem:data) {
JSONObject json = new JSONObject();
for(Map.Entry<String, Object> entry:rowItem.entrySet()) {
json.put(entry.getKey(), entry.getValue());
}
jsonArray.add(json);
}
return jsonArray;
}
}
- QueryDiscover.java文件執行查詢Info表的操作，並將查詢的結果封裝爲Json格式返回
package myServlet.data;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.ResultSet;
/*import java.sql.ResultSetMetaData;*/
import java.sql.Statement;import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.utils.JdbcUtils;
import org.utils.JsonUtils;
import com.sun.rowset.CachedRowSetImpl;
import net.sf.json.JSONArray;
import java.util.List;
import java.util.Map;
import java.util.HashMap;
import java.util.ArrayList;
/**
* Servlet implementation class QueryDiscover
*/
@WebServlet("/QueryDiscover")
public class QueryDiscover extends HttpServlet {
private static final long serialVersionUID = 1L;
CachedRowSetImpl rowSet = null; //存儲表中全部記錄的行集對象
int pageSize; //每頁加載數量
int pageNum; //第幾頁
int totalRecord; //總記錄數
int totalPage; //總頁數
/**
* @see HttpServlet#HttpServlet()
*/
public QueryDiscover() {
super();
// TODO Auto-generated constructor stub
}/**
* @see Servlet#init(ServletConfig)
*/
public void init(ServletConfig config) throws ServletException {
// TODO Auto-generated method stub
}/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.setContentType("text/html;charset=utf-8");
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
PrintWriter out = response.getWriter();
String page = request.getParameter("page");
String count = request.getParameter("count");
if(page == null||page == "") {
page = "1";
}
if(count == null|count == "") {
count = "10";
}
try {
pageNum = Integer.parseInt(page); //第幾頁
pageSize = Integer.parseInt(count); //每頁加載幾條
} catch (NumberFormatException e) {
e.printStackTrace();
}
String condition = "select * from info";
Connection connection = null;
Statement sql = null;
ResultSet rs = null;try {
connection = JdbcUtils.getConnection();
sql = connection.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_READ_ONLY);
rs = sql.executeQuery(condition);
/*用於測試
* while(rs.next()) {
String infoId = rs.getString(1); //內容ID
String infoTitle = rs.getString(2); //內容標題
String infoDescribe = rs.getString(3); //內容簡述
String infoDetail = rs.getString("info_detail"); //內容詳情
String type = rs.getString(5); //類型：0表示日記，1表示趣事
String support = rs.getString(6); //點贊數
String infoAuthor = rs.getString(7); //作者out.println(infoId+"--"+infoTitle+"--"+infoDescribe+"--"+infoDetail+"--"+type+"--"+support+"--"+infoAuthor);
out.println("__________________________________________");
}*/
rowSet = new CachedRowSetImpl(); //創建行集對象
rowSet.populate(rs);
//按查詢頁數返回結果
returnByPage(request,response,rowSet);
} catch (Exception e) {
out.println(condition+"異常："+e.toString());
e.printStackTrace();
}finally {
//5.釋放資源 connection prepareStatement
JdbcUtils.statementClose(connection, sql, rs);
}
}/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
public void returnByPage(HttpServletRequest request, HttpServletResponse response,CachedRowSetImpl rowSet)throws ServletException, IOException{
response.setContentType("text/html;charset=utf-8");
response.setCharacterEncoding("utf-8");
JSONArray jsonArray = new JSONArray();//存放返回的jsonOjbect數組
//將rowSet的數據提取到Map
List<Map<String,Object>> data = new ArrayList<Map<String,Object>>();
try {
PrintWriter out = response.getWriter();
try {
//ResultSetMetaData metaData = rowSet.getMetaData();
//int columnCount = metaData.getColumnCount(); //返回總列數
rowSet.last(); //移到隨後一行
totalRecord = rowSet.getRow();
/*out.println("全部記錄數"+totalRecord); //全部的記錄數*/
if(totalRecord%pageSize==0){
totalPage = totalRecord/pageSize; //總頁數
}else{
totalPage = totalRecord/pageSize+1;
}
int index = (pageNum-1)*pageSize+1;
rowSet.absolute(index); //查詢位置移動到查詢頁的起始記錄位置
boolean boo = true;
for(int i=1; i<=pageSize&&boo;i++){
/*Object infoId = rowSet.getObject(1);
Object infoTitle = rowSet.getObject(2);*/
String infoId = rowSet.getString(1); //內容ID
String infoTitle = rowSet.getString(2); //內容標題
String infoDescribe = rowSet.getString(3); //內容簡述
String infoDetail = rowSet.getString("info_detail"); //內容詳情
String type = rowSet.getString(5); //類型：0表示日記，1表示趣事
String support = rowSet.getString(6); //點贊數
String infoAuthor = rowSet.getString(7); //作者
Map<String,Object> map = new HashMap<String,Object>();
map.put("infoId", infoId);
map.put("infoTitle", infoTitle);
map.put("infoDescribe", infoDescribe);
map.put("infoDetail", infoDetail);
map.put("infoType", type);
map.put("infoSupport", support);
map.put("infoAuthor", infoAuthor);
/*Map<String,Object> map = new HashMap<String,Object>();
for(int j = 1;j<columnCount;j++) {
map.put(metaData.getColumnClassName(j), rowSet.getObject(j));
}*/
data.add(map);
boo = rowSet.next();
}
jsonArray = JsonUtils.formatRsToJsonArray(data);
out.println(jsonArray.toString()); //返回json
}catch(Exception e) {
}
}catch(IOException e) {
}
}
}