<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.wxchatdemo.MainWeixin">
    <ListView
        android:id="@+id/listView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:divider="@drawable/main_list_divider_line"
        android:dividerHeight="1.5px"
        android:layout_marginBottom="50dp" />
    <com.example.wxchatdemo.tools.SideBar
        android:id="@+id/side_bar"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentRight="true"
        android:layout_marginBottom="100dp"
        android:layout_marginTop="100dp"
        android:paddingRight="10dp"
        android:textColor="@color/black"
        android:textSize="9sp" />
</RelativeLayout>

package com.example.wxchatdemo;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.MotionEvent;
public class SideBar extends android.support.v7.widget.AppCompatTextView {
    private String[] letters = new String[]{"A", "B", "C", "D", "E", "F",
            "G", "H", "I", "J", "K", "L",
            "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V",
            "W", "X", "Y", "Z", "#"};
    private Paint textPaint;
    private Paint bigTextPaint;
    private Paint scaleTextPaint;
    private Canvas canvas;
    private int itemH;
    private int w;
    private int h;
    /**
     * 普通情況下字體大小
     */
    float singleTextH;
    /**
     * 縮放離原始的寬度
     */
    private float scaleWidth;
    /**
     * 滑動(dòng)的Y
     */
    private float eventY = 0;
    /**
     * 縮放的倍數(shù)
     */
    private int scaleSize = 1;
    /**
     * 縮放個(gè)數(shù)item，即開口大小
     */
    private int scaleItemCount = 6;
    private ISideBarSelectCallBack callBack;
    public SideBar(Context context) {
        this(context, null);
    }
    public SideBar(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }
    public SideBar(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init(attrs);
    }
    private void init(AttributeSet attrs) {
        if (attrs != null) {
            TypedArray ta = getContext().obtainStyledAttributes(attrs, R.styleable.SideBar);
            scaleSize = ta.getInteger(R.styleable.SideBar_scaleSize, 1);
            scaleItemCount = ta.getInteger(R.styleable.SideBar_scaleItemCount, 6);
            scaleWidth = ta.getDimensionPixelSize(R.styleable.SideBar_scaleWidth, dp(100));
            ta.recycle();
        }
        textPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        textPaint.setColor(getCurrentTextColor());
        textPaint.setTextSize(getTextSize());
        textPaint.setTextAlign(Paint.Align.CENTER);
        bigTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        bigTextPaint.setColor(getCurrentTextColor());
        bigTextPaint.setTextSize(getTextSize() * (scaleSize + 3));
        bigTextPaint.setTextAlign(Paint.Align.CENTER);
        scaleTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        scaleTextPaint.setColor(getCurrentTextColor());
        scaleTextPaint.setTextSize(getTextSize() * (scaleSize + 1));
        scaleTextPaint.setTextAlign(Paint.Align.CENTER);
    }
    public void setDataResource(String[] data) {
        letters = data;
        invalidate();
    }
    public void setOnStrSelectCallBack(ISideBarSelectCallBack callBack) {
        this.callBack = callBack;
    }
    /**
     * 設(shè)置字體縮放比例     *     * @param scale
     */
    public void setScaleSize(int scale) {
        scaleSize = scale;
        invalidate();
    }
    /**
     * 設(shè)置縮放字體的個(gè)數(shù)，即開口大小     *     * @param scaleItemCount
     */
    public void setScaleItemCount(int scaleItemCount) {
        this.scaleItemCount = scaleItemCount;
        invalidate();
    }
    private int dp(int px) {
        final float scale = getContext().getResources().getDisplayMetrics().density;
        return (int) (px * scale + 0.5f);
    }
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
            case MotionEvent.ACTION_MOVE:
                if (event.getX() > (w - getPaddingRight() - singleTextH - 10)) {
                    eventY = event.getY();
                    invalidate();
                    return true;
                } else {
                    eventY = 0;
                    invalidate();
                    break;
                }
            case MotionEvent.ACTION_CANCEL:
                eventY = 0;
                invalidate();
                return true;
            case MotionEvent.ACTION_UP:
                if (event.getX() > (w - getPaddingRight() - singleTextH - 10)) {
                    eventY = 0;
                    invalidate();
                    return true;
                } else
                    break;
        }
        return super.onTouchEvent(event);
    }
    @Override
    protected void onDraw(Canvas canvas) {
        this.canvas = canvas;
        DrawView(eventY);
    }
    private void DrawView(float y) {
        int currentSelectIndex = -1;
        if (y != 0) {
            for (int i = 0; i < letters.length; i++) {
                float currentItemY = itemH * i;
                float nextItemY = itemH * (i + 1);
                if (y >= currentItemY && y < nextItemY) {
                    currentSelectIndex = i;
                    if (callBack != null) {
                        callBack.onSelectStr(currentSelectIndex, letters[i]);
                    }                    //畫大的字母
                    Paint.FontMetrics fontMetrics = bigTextPaint.getFontMetrics();
                    float bigTextSize = fontMetrics.descent - fontMetrics.ascent;
                    canvas.drawText(letters[i], w - getPaddingRight() - scaleWidth - bigTextSize,
                            singleTextH + itemH * i, bigTextPaint);
                }
            }
        }
        drawLetters(y, currentSelectIndex);
    }
    private void drawLetters(float y, int index) {        //第一次進(jìn)來沒有縮放情況，默認(rèn)畫原圖
        if (index == -1) {
            w = getMeasuredWidth();
            h = getMeasuredHeight();
            itemH = h / letters.length;
            Paint.FontMetrics fontMetrics = textPaint.getFontMetrics();
            singleTextH = fontMetrics.descent - fontMetrics.ascent;
            for (int i = 0; i < letters.length; i++) {
                canvas.drawText(letters[i], w - getPaddingRight(), singleTextH + itemH * i, textPaint);
            }            //觸摸的時(shí)候畫縮放圖
        } else {            //遍歷所有字母
            for (int i = 0; i < letters.length; i++) {                //要畫的字母的起始Y坐標(biāo)
                float currentItemToDrawY = singleTextH + itemH * i;
                float centerItemToDrawY;
                if (index < i)
                    centerItemToDrawY = singleTextH + itemH * (index + scaleItemCount);
                else
                    centerItemToDrawY = singleTextH + itemH * (index - scaleItemCount);
                float delta = 1 - Math.abs((y - currentItemToDrawY) / (centerItemToDrawY - currentItemToDrawY));
                float maxRightX = w - getPaddingRight();                //如果大于0，表明在y坐標(biāo)上方
                scaleTextPaint.setTextSize(getTextSize() + getTextSize() * delta);
                float drawX = maxRightX - scaleWidth * delta;                //超出邊界直接花在邊界上
                if (drawX > maxRightX)
                    canvas.drawText(letters[i], maxRightX, singleTextH + itemH * i, textPaint);
                else
                    canvas.drawText(letters[i], drawX, singleTextH + itemH * i, scaleTextPaint);
            }
        }
    }
    public interface ISideBarSelectCallBack {
        void onSelectStr(int index, String selectStr);
    }
}

    <declare-styleable name="SideBar">
        <attr name="scaleSize" format="integer"/>
        <attr name="scaleItemCount" format="integer"/>
        <attr name="scaleWidth" format="dimension"/>
    </declare-styleable>

package com.example.wxchatdemo.tools;
import net.sourceforge.pinyin4j.PinyinHelper;
import net.sourceforge.pinyin4j.format.HanyuPinyinCaseType;
import net.sourceforge.pinyin4j.format.HanyuPinyinOutputFormat;
import net.sourceforge.pinyin4j.format.HanyuPinyinToneType;
/** * 漢字轉(zhuǎn)換位漢語拼音，英文字符不變 */
public class Cn2Spell {
    public static StringBuffer sb = new StringBuffer();
    /**     * 獲取漢字字符串的首字母，英文字符不變     * 例如：阿飛→af     */
    public static String getPinYinHeadChar(String chines) {
        sb.setLength(0);
        char[] chars = chines.toCharArray();
        HanyuPinyinOutputFormat defaultFormat = new HanyuPinyinOutputFormat();
        defaultFormat.setCaseType(HanyuPinyinCaseType.LOWERCASE);
        defaultFormat.setToneType(HanyuPinyinToneType.WITHOUT_TONE);
        for (int i = 0; i < chars.length; i++) {
            if (chars[i] > 128) {
                try {
                    sb.append(PinyinHelper.toHanyuPinyinStringArray(chars[i], defaultFormat)[0].charAt(0));                }
                catch (Exception e) {
                    e.printStackTrace();                }
            }
            else {
                sb.append(chars[i]);            }
        }
        return sb.toString();    }
        /**     * 獲取漢字字符串的第一個(gè)字母     */
        public static String getPinYinFirstLetter(String str) {
            sb.setLength(0);
            char c = str.charAt(0);
            String[] pinyinArray = PinyinHelper.toHanyuPinyinStringArray(c);
            if (pinyinArray != null) {
                sb.append(pinyinArray[0].charAt(0));        }
            else {
                sb.append(c);
            }
            return sb.toString();
        }
        /**     * 獲取漢字字符串的漢語拼音，英文字符不變     */
        public static String getPinYin(String chines) {
            sb.setLength(0);
            char[] nameChar = chines.toCharArray();
            HanyuPinyinOutputFormat defaultFormat = new HanyuPinyinOutputFormat();
            defaultFormat.setCaseType(HanyuPinyinCaseType.LOWERCASE);
            defaultFormat.setToneType(HanyuPinyinToneType.WITHOUT_TONE);
            for (int i = 0; i < nameChar.length; i++) {
                if (nameChar[i] > 128) {
                    try {
                        sb.append(PinyinHelper.toHanyuPinyinStringArray(nameChar[i], defaultFormat)[0]);}
                    catch (Exception e) {
                    e.printStackTrace();                }
                }
                else {
                    sb.append(nameChar[i]);            }
            }
            return sb.toString();
        }
}

package com.example.wxchatdemo.tools;
 public class User implements Comparable<User> {
     private String name; // 姓名
     private String pinyin; // 姓名對(duì)應(yīng)的拼音
     private String firstLetter; // 拼音的首字母
     public User() {    }
     public User(String name) {
         this.name = name;
         pinyin = Cn2Spell.getPinYin(name); // 根據(jù)姓名獲取拼音
         firstLetter = pinyin.substring(0, 1).toUpperCase(); // 獲取拼音首字母并轉(zhuǎn)成大寫
         if (!firstLetter.matches("[A-Z]")) { // 如果不在A-Z中則默認(rèn)為“#”
        firstLetter = "#";        }
     }
     public String getName() {
         return name;
     }
     public String getPinyin() {
         return pinyin;
     }
     public String getFirstLetter() {
         return firstLetter;
     }
     @Override
     public int compareTo(com.example.wxchatdemo.tools.User another) {
         if (firstLetter.equals("#") && !another.getFirstLetter().equals("#")) {
             return 1;
         }
         else if (!firstLetter.equals("#") && another.getFirstLetter().equals("#")){
             return -1;
         } else {
             return pinyin.compareToIgnoreCase(another.getPinyin());
         }
     }
 }

package com.example.wxchatdemo;
import android.annotation.SuppressLint;
import android.app.Fragment;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;
import com.example.wxchatdemo.adapter.SortAdapter;
import com.example.wxchatdemo.tools.User;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@SuppressLint("ValidFragment")
public class ContactListFragment extends Fragment {
    String[] imgUrl;
    String[] name;
    private String number; //微信號(hào)，通過微信號(hào)去查找通訊錄
    /* 聲明組件*/
    private ListView listView;
    private SideBar sideBar;
    /*聲明或創(chuàng)建集合，用于處理數(shù)據(jù)*/
    private ArrayList<User> list;
    private ArrayList<Integer> list2;
    private List<Map<String, String>> data = new ArrayList<Map<String, String>>();
    //自定義的一個(gè)Hander消息機(jī)制
    private MyHander myhander = new MyHander();
    /*有參構(gòu)造方法，參數(shù)為微信號(hào)*/
    @SuppressLint("ValidFragment")
    ContactListFragment(String number) {
        this.number = number;
    }
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        /*開啟一個(gè)線程，用微信號(hào)向服務(wù)器請(qǐng)求通訊錄數(shù)據(jù)*/
        Thread thread1 = new Thread(new Runnable() {
            @Override
            public void run() {
                httpUrlConnPost(String.valueOf(number));
            }
        });
        thread1.start();
        /*等待線性處理完成*/
        try {
            thread1.join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        //獲取fragment布局
        View view = inflater.inflate(R.layout.contactlist_fragment, container, false);
        /*初始化組件*/
        listView = (ListView) view.findViewById(R.id.listView);
        sideBar = (SideBar) view.findViewById(R.id.side_bar);
        //初始化數(shù)據(jù)
        initData();
        sideBar.setOnStrSelectCallBack(new SideBar.ISideBarSelectCallBack() {
            @Override
            public void onSelectStr(int index, String selectStr) {
                for (int i = 0; i < list.size(); i++) {
                    if (list.get(i).getName() == "新的朋友" || list.get(i).getName() == "群聊" ||
                            list.get(i).getName() == "標(biāo)簽" || list.get(i).getName() == "公眾號(hào)"  )
                        continue;
                    if (selectStr.equalsIgnoreCase(list.get(i).getFirstLetter())) {
                        listView.setSelection(i); // 選擇到首字母出現(xiàn)的位置
                        return;
                    }
                }
            }
        });
        return view;
    }
    private void initData() {
        //把從服務(wù)器獲取解析的數(shù)據(jù)添加到map中，方便處理
        Map<String, String> map = new HashMap<String, String>();
        for (int i = 0; i < imgUrl.length; i ++) {
            map.put(name[i], imgUrl[i]);
        }
        data.add(map);
        //名字要提取出來在添加到list中，因?yàn)橐M(jìn)行字母排序
        list = new ArrayList<>();
        for (int i = 0; i < imgUrl.length; i++) {
            list.add(new User(name[i]));
        }
        Collections.sort(list); // 對(duì)list進(jìn)行排序，需要讓User實(shí)現(xiàn)Comparable接口重寫compareTo方法
        //四個(gè)標(biāo)簽排序后再進(jìn)行添加，好進(jìn)行條件判斷分離出來
        list.add(0,new User("新的朋友"));
        list.add(1,new User("群聊"));
        list.add(2,new User("標(biāo)簽"));
        list.add(3,new User("公眾號(hào)"));
        //四個(gè)標(biāo)簽圖片不需要再服務(wù)器獲取，直接移動(dòng)端實(shí)現(xiàn)即可
        list2 = new ArrayList<>();
        list2.add(R.drawable.newfriend);
        list2.add(R.drawable.groupchat);
        list2.add(R.drawable.sign);
        list2.add(R.drawable.publicnum);
        /*創(chuàng)建自定義適配器，并設(shè)置給listview*/
        SortAdapter adapter = new SortAdapter(getActivity().getApplicationContext(), list, list2, data);
        listView.setAdapter(adapter);
    }
    // 1.編寫一個(gè)發(fā)送請(qǐng)求的方法
    // 發(fā)送請(qǐng)求的主要方法
    public void httpUrlConnPost(String number) {
        HttpURLConnection urlConnection = null;
        URL url;
        try {
            // 請(qǐng)求的URL地地址
            url = new URL(
                    "http://100.2.178.10:8080/AndroidServer_war_exploded/Contact");
            urlConnection = (HttpURLConnection) url.openConnection();// 打開http連接
            urlConnection.setConnectTimeout(3000);// 連接的超時(shí)時(shí)間
            urlConnection.setUseCaches(false);// 不使用緩存
            // urlConnection.setFollowRedirects(false);是static函數(shù)，作用于所有的URLConnection對(duì)象。
            urlConnection.setInstanceFollowRedirects(true);// 是成員函數(shù)，僅作用于當(dāng)前函數(shù),設(shè)置這個(gè)連接是否可以被重定向
            urlConnection.setReadTimeout(3000);// 響應(yīng)的超時(shí)時(shí)間
            urlConnection.setDoInput(true);// 設(shè)置這個(gè)連接是否可以寫入數(shù)據(jù)
            urlConnection.setDoOutput(true);// 設(shè)置這個(gè)連接是否可以輸出數(shù)據(jù)
            urlConnection.setRequestMethod("POST");// 設(shè)置請(qǐng)求的方式
            urlConnection.setRequestProperty("Content-Type",
                    "application/json;charset=UTF-8");// 設(shè)置消息的類型
            urlConnection.connect();// 連接，從上述至此的配置必須要在connect之前完成，實(shí)際上它只是建立了一個(gè)與服務(wù)器的TCP連接
            JSONObject json = new JSONObject();// 創(chuàng)建json對(duì)象
            //json.put("title", URLEncoder.encode(title, "UTF-8"));// 使用URLEncoder.encode對(duì)特殊和不可見字符進(jìn)行編碼
            json.put("number", URLEncoder.encode(number, "UTF-8"));// 把數(shù)據(jù)put進(jìn)json對(duì)象中
            String jsonstr = json.toString();// 把JSON對(duì)象按JSON的編碼格式轉(zhuǎn)換為字符串
            // ------------字符流寫入數(shù)據(jù)------------
            OutputStream out = urlConnection.getOutputStream();// 輸出流，用來發(fā)送請(qǐng)求，http請(qǐng)求實(shí)際上直到這個(gè)函數(shù)里面才正式發(fā)送出去
            BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(out));// 創(chuàng)建字符流對(duì)象并用高效緩沖流包裝它，便獲得最高的效率,發(fā)送的是字符串推薦用字符流，其它數(shù)據(jù)就用字節(jié)流
            bw.write(jsonstr);// 把json字符串寫入緩沖區(qū)中
            bw.flush();// 刷新緩沖區(qū)，把數(shù)據(jù)發(fā)送出去，這步很重要
            out.close();
            bw.close();// 使用完關(guān)閉
            Log.i("aa", urlConnection.getResponseCode()+"");
            //以下判斷是否訪問成功，如果返回的狀態(tài)碼是200則說明訪問成功
            if (urlConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {// 得到服務(wù)端的返回碼是否連接成功
                // ------------字符流讀取服務(wù)端返回的數(shù)據(jù)------------
                InputStream in = urlConnection.getInputStream();
                BufferedReader br = new BufferedReader(
                        new InputStreamReader(in));
                String str = null;
                StringBuffer buffer = new StringBuffer();
                while ((str = br.readLine()) != null) {// BufferedReader特有功能，一次讀取一行數(shù)據(jù)
                    System.out.println("測試：" + str);
                    buffer.append(str);
                }
                in.close();
                br.close();
                JSONObject rjson = new JSONObject(buffer.toString());
                String str1 = rjson.getJSONObject("json").get("img").toString();
                imgUrl = str1.split("\r\n");
                String str2 = rjson.getJSONObject("json").get("name").toString();
                name = str2.split("\r\n");
                boolean result = rjson.getBoolean("json");// 從rjson對(duì)象中得到key值為"json"的數(shù)據(jù)，這里服務(wù)端返回的是一個(gè)boolean類型的數(shù)據(jù)
                System.out.println("json:===" + result);
                //如果服務(wù)器端返回的是true，則說明注冊(cè)成功，否則注冊(cè)失敗
                if (result) {// 判斷結(jié)果是否正確
                    //在Android中http請(qǐng)求，必須放到線程中去作請(qǐng)求，但是在線程中不可以直接修改UI，只能通過hander機(jī)制來完成對(duì)UI的操作
                    myhander.sendEmptyMessage(1);
                    Log.i("用戶：", "登錄成功");
                } else {
                    myhander.sendEmptyMessage(2);
                    System.out.println("222222222222222");
                    Log.i("用戶：", "登錄失敗");
                }
            } else {
                myhander.sendEmptyMessage(2);
            }
        } catch (Exception e) {
            e.printStackTrace();
            Log.i("aa", e.toString());
            System.out.println("11111111111111111");
            myhander.sendEmptyMessage(2);
        } finally {
            urlConnection.disconnect();// 使用完關(guān)閉TCP連接，釋放資源
        }
    }
    // 在Android中不可以在線程中直接修改UI，只能借助Handler機(jī)制來完成對(duì)UI的操作
    class MyHander extends Handler {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            //判斷hander的內(nèi)容是什么，如果是1則說明注冊(cè)成功，如果是2說明注冊(cè)失敗
            switch (msg.what) {
                case 1:
                    Log.i("aa", msg.what + "");
                    break;
                case 2:
                    Log.i("aa", msg.what + "");
            }
        }
    }
}

<?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="wrap_content"
    android:gravity="center_vertical"
    android:orientation="vertical">
    <TextView
        android:id="@+id/catalog"
        android:layout_width="match_parent"
        android:layout_height="32dp"
        android:background="#E0E0E0"
        android:paddingLeft="10dp"
        android:paddingTop="5dp"
        android:textColor="#454545"
        android:textSize="13sp" />
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <ImageView
            android:id="@+id/img"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:padding="10dp" />
        <TextView
            android:id="@+id/name"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:gravity="center_vertical"
            android:padding="10dp"
            android:textColor="#336598"
            android:textSize="16sp" />
    </LinearLayout>
    <View
        android:id="@+id/divider"
        android:layout_width="match_parent"
        android:layout_height="0.5dp"
        android:background="#90909090" />
    <TextView
        android:id="@+id/contact_count"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:background="#FFFFFF"
        android:paddingLeft="150dp"
        android:paddingTop="5dp"
        android:textColor="#454545"
        android:textSize="13sp" />
</LinearLayout>

package com.example.controller;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.example.pojo.ContactList;
import com.example.service.UserServiceImpl;
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 java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URLDecoder;
@WebServlet(name = "Contact", value = "/Contact")
public class Contact extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doPost(request,response);
    }
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //設(shè)置字符編碼，防止中文亂碼
        request.setCharacterEncoding("utf-8");
        response.setCharacterEncoding("UTF-8");
        //以json數(shù)據(jù)完成操作
        response.setContentType("application/json;charset=UTF-8");
        System.out.println(request.getContentType());// 得到客戶端發(fā)送過來內(nèi)容的類型，application/json;charset=UTF-8
        System.out.println(request.getRemoteAddr());// 得到客戶端的ip地址，
        BufferedReader br = new BufferedReader(new InputStreamReader(// 使用字符流讀取客戶端發(fā)過來的數(shù)據(jù)
                request.getInputStream()));
        String line = null;
        StringBuffer s = new StringBuffer();//StringBuffer String的區(qū)別，如果要對(duì)數(shù)據(jù)作頻繁的修改，則用StringBuffer
        // 以一行的形式讀取數(shù)據(jù)
        while ((line = br.readLine()) != null) {
            s.append(line);
        }
        // 關(guān)閉io流
        br.close();
        System.out.println(s.toString());// {"password":"123456","name":"admin"}
        //JSON：這是json解析包，IDEA是沒有，要我們自己導(dǎo)入
        ContactList contactList = JSON.parseObject(s.toString(), ContactList.class);//是用了反射機(jī)制來完成對(duì)象的封閉
        //以u(píng)tf-8解碼操作
        String number = URLDecoder.decode(contactList.getNumber(), "utf-8");
        System.out.println(contactList);
        // 去數(shù)據(jù)庫完成用戶登錄功能
        UserServiceImpl us = new UserServiceImpl();
        //調(diào)用登錄的方法
        ContactList contactList1 = us.contact(number);
        if(contactList1  != null) {
            //將結(jié)果返回給客戶端	，將結(jié)果構(gòu)建成json數(shù)據(jù)返回給客戶端
            JSONObject rjson = new JSONObject();
            rjson.put("json", contactList1 );
            response.getOutputStream().write(
                    rjson.toString().getBytes("UTF-8"));// 向客戶端發(fā)送一個(gè)帶有json對(duì)象內(nèi)容的響應(yīng)
        }
    }
}

package com.example.pojo;
public class ContactList {
    private int id;
    private String img;
    private String name;
    private String number;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getImg() {
        return img;
    }
    public void setImg(String img) {
        this.img = img;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getNumber() {
        return number;
    }
    public void setNumber(String number) {
        this.number = number;
    }
    @Override
    public String toString() {
        return "ContactList{" +
                "id=" + id +
                ", img='" + img + '\'' +
                ", name='" + name + '\'' +
                ", number='" + number + '\'' +
                '}';
    }
}

  //微信通訊錄
    ContactList contact(String number);

  public ContactList contact(String number) {
        //調(diào)用dao層完成數(shù)據(jù)查詢操作
        ContactList contactList = ud.findContact(number);
        return contactList;
    }

  //查詢微信通信錄列表
    ContactList findContact(String number);

    @Override
    public ContactList findContact(String number) {
        String sql = "select * from contact where number=?;";
        ResultSet rs = JDBCUtil.executeQuery(sql, number);
        //判斷是否查詢到用戶
        try {
            if (rs.next()) {
                //如果查詢到用戶，將用戶封裝到User對(duì)象中
                int id = rs.getInt("id");
                String img = rs.getString("img");
                String name = rs.getString("name");
                String number1 = rs.getString("number");
                //將查詢到的用戶封裝到一個(gè)User對(duì)象中
                ContactList contactList = new ContactList();
                contactList .setId(id);
                contactList .setImg(img);
                contactList .setName(name);
                contactList .setNumber(number1);
                System.out.println("查詢到的用戶" + contactList);
                return contactList;
            }
        }catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        return null;
    }