java 小程序打开默认分享功能 java小程序后端

1、注意事项

（1）微信小程序的websocket连接服务端websocket服务，开发时可用ws+ip+端口，发布时只能用wss+域名。
（2）小程序其他业务访问后台开发商可用http+IP+端口，发布时只能用https+域名
（3）小程序要在微信小程序公众平台配置合法域名发布后才能正常访问。

2、后台代码

（1）后台类说明：

• websocket启动监听交互类。
• 存储当前已连接用户及用户操作类。

（2）导入jar包（maven导入）

<!-- 添加websocket依赖jar包 -->
<dependency>
    <groupId>org.java-websocket</groupId>
    <artifactId>Java-WebSocket</artifactId>
    <version>1.3.0</version>
</dependency>

（3）操作类：WsPool

package com.thinkgem.jeesite.modules.mjd.listener;

import com.thinkgem.jeesite.common.utils.StringUtils;
import org.java_websocket.WebSocket;
import java.util.*;

public class WsPool {
    private static final Map<WebSocket, String> wsUserMap = new HashMap<WebSocket, String>();

    /**
     * 通过websocket连接获取其对应的用户
     */
    public static String getUserByWs(WebSocket conn) {
        return wsUserMap.get(conn);
    }

    /**
     * 根据userName获取WebSocket,这是一个list,此处取第一个
     * 因为有可能多个websocket对应一个userName（但一般是只有一个，因为在close方法中，我们将失效的websocket连接去除了）
     */
    public static WebSocket getWsByUser(String userName) {
        Set<WebSocket> keySet = wsUserMap.keySet();
        synchronized (keySet) {
            for (WebSocket conn : keySet) {
                String cuser = wsUserMap.get(conn);
                if (cuser.equals(userName)) {
                    return conn;
                }
            }
        }
        return null;
    }

    /**
     * 向连接池中添加连接
     */
    public static void addUser(String userName, WebSocket conn) {
        wsUserMap.put(conn, userName); // 添加连接
    }

    /**
     * 获取所有连接池中的用户，因为set是不允许重复的，所以可以得到无重复的user数组
     */
    public static Collection<String> getOnlineUser() {
        List<String> setUsers = new ArrayList<String>();
        Collection<String> setUser = wsUserMap.values();
        for (String u : setUser) {
            setUsers.add(u);
        }
        return setUsers;
    }

    /**
     * 移除连接池中的连接
     */
    public static boolean removeUser(WebSocket conn) {
        if (wsUserMap.containsKey(conn)) {
            wsUserMap.remove(conn); // 移除连接
            return true;
        } else {
            return false;
        }
    }

    /**
     * 向特定的用户发送数据
     */
    public static void sendMessageToUser(WebSocket conn, String message) {
        if (null != conn && null != wsUserMap.get(conn)) {
            conn.send(message);
        }
    }

    /**
     * 向所有用户名中包含某个特征得用户发送消息
     */
    public static void sendMessageToSpecialUser(String message,String special) {
        Set<WebSocket> keySet = wsUserMap.keySet();
        if (special == null) {
            special = "";
        }
        synchronized (keySet) {
            for (WebSocket conn:keySet) {
                String user = wsUserMap.get(conn);
                try {
                    if (user != null) {
                        String [] cus = user.split("_");
                        if (!StringUtils.isNullOrEmpty(cus[0])) {
                            String cusDot = "," + cus[0] + ",";
                            if (cusDot.contains(","+special+",")) {
                                    conn.send(message);
                            }
                        }else {
                            conn.send(message);
                        }
                    }
                }catch (Exception e) {
                    e.printStackTrace();
                    //wsUserMap.remove(conn);
                }
            }
                
        }
    }
    
    /**
     * 向所有的用户发送消息
     */
    public static void sendMessageToAll(String message) {
        Set<WebSocket> keySet = wsUserMap.keySet();
        synchronized (keySet) {
            for (WebSocket conn : keySet) {
                String user = wsUserMap.get(conn);
                if (user != null) {
                    conn.send(message);
                }
            }
        }
    }
}

（4）websocket启动监听交互类 MyWebScoket ：

package com.thinkgem.jeesite.modules.mjd.listener;

import com.alibaba.fastjson.JSONObject;

import org.java_websocket.WebSocket;
import org.java_websocket.WebSocketImpl;
import org.java_websocket.handshake.ClientHandshake;
import org.java_websocket.server.WebSocketServer;

import java.net.InetSocketAddress;
import java.net.UnknownHostException;
import java.util.Map;

public class MyWebScoket extends WebSocketServer {

    public MyWebScoket() throws UnknownHostException {
        super();
    }
    
    public MyWebScoket(int port)  {
        super(new InetSocketAddress(port));
    }

    public MyWebScoket(InetSocketAddress address) {
        super(address);
    }

    @Override
    public void onOpen(WebSocket conn, ClientHandshake handshake) {
        // ws连接的时候触发的代码，onOpen中我们不做任何操作
    }

    @Override
    public void onClose(WebSocket conn, int code, String reason, boolean remote) {
        //断开连接时候触发代码
        userLeave(conn);
        System.out.println("有用户已离线==========="+reason);
    }

    @Override
    public void onMessage(WebSocket conn, String message) {
        //有用户连接进来
        Map<String, String> obj =  (Map<String,String>) JSONObject.parse(message);
        System.out.println(message);
        //添加用户到线程池
        String username = obj.get("name");
        userJoin(conn,  username);
        
        /*int i=0;*/
        /*WsPool.sendMessageToUser(c,i+"");*/
        /*while(true){
        	try {
				Thread.sleep(3*1000);
				WsPool.sendMessageToUser(c,i+"");
				i++;
				System.out.println(i+"");
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
        }*/
    }

    @Override
    public void onError(WebSocket conn, Exception ex) {
        //错误时候触发的代码
        System.out.println("on error");
        ex.printStackTrace();
    }

    /**
     * 去除掉失效的websocket链接
     */
    private void userLeave(WebSocket conn){
        WsPool.removeUser(conn);
    }
    /**
     * 将websocket加入用户池
     * @param conn
     * @param userName
     */
    private void userJoin(WebSocket conn,String userName){
        WsPool.addUser(userName, conn);
    }


    /**
     * 启动websocket
     */
    public static void startWebsocketInstantMsg() {
        WebSocketImpl.DEBUG = false;
        MyWebScoket s;
        s = new MyWebScoket(4909);
        s.start();
        System.out.println("websocket启动成功");
    }
}

（5）字符串操作类 StringUtils ：

package com.thinkgem.jeesite.common.utils;

import java.io.UnsupportedEncodingException;
import java.util.List;
import java.util.Locale;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.lang3.BooleanUtils;
import org.apache.commons.lang3.StringEscapeUtils;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import org.springframework.web.servlet.LocaleResolver;

import com.google.common.collect.Lists;

/**
 * 字符串工具类, 继承org.apache.commons.lang3.StringUtils类
 */
public class StringUtils extends org.apache.commons.lang3.StringUtils {
	
    private static final char SEPARATOR = '_';
    private static final String CHARSET_NAME = "UTF-8";
    
    /**
     * 转换为字节数组
     * @param str
     * @return
     */
    public static byte[] getBytes(String str){
    	if (str != null){
    		try {
				return str.getBytes(CHARSET_NAME);
			} catch (UnsupportedEncodingException e) {
				return null;
			}
    	}else{
    		return null;
    	}
    }
    
    /**
	 * 转换为Boolean类型
	 * 'true', 'on', 'y', 't', 'yes' or '1' (case insensitive) will return true. Otherwise, false is returned.
	 */
	public static Boolean toBoolean(final Object val){
		if (val == null){
			return false;
		}
		return BooleanUtils.toBoolean(val.toString()) || "1".equals(val.toString());
	}
	
    /**
     * 转换为字节数组
     * @param str
     * @return
     */
    public static String toString(byte[] bytes){
    	try {
			return new String(bytes, CHARSET_NAME);
		} catch (UnsupportedEncodingException e) {
			return EMPTY;
		}
    }
    
    /**
	 * 如果对象为空，则使用defaultVal值 
	 * 	see: ObjectUtils.toString(obj, defaultVal)
	 * @param obj
	 * @param defaultVal
	 * @return
	 */
    public static String toString(final Object obj, final String defaultVal) {
    	 return obj == null ? defaultVal : obj.toString();
    }
    
    /**
     * 是否包含字符串
     * @param str 验证字符串
     * @param strs 字符串组
     * @return 包含返回true
     */
    public static boolean inString(String str, String... strs){
    	if (str != null){
        	for (String s : strs){
        		if (str.equals(trim(s))){
        			return true;
        		}
        	}
    	}
    	return false;
    }
    
	/**
	 * 替换掉HTML标签方法
	 */
	public static String replaceHtml(String html) {
		if (isBlank(html)){
			return "";
		}
		String regEx = "<.+?>";
		Pattern p = Pattern.compile(regEx);
		Matcher m = p.matcher(html);
		String s = m.replaceAll("");
		return s;
	}
	
	/**
	 * 替换为手机识别的HTML，去掉样式及属性，保留回车。
	 * @param html
	 * @return
	 */
	public static String replaceMobileHtml(String html){
		if (html == null){
			return "";
		}
		return html.replaceAll("<([a-z]+?)\\s+?.*?>", "<$1>");
	}
	
	/**
	 * 替换为手机识别的HTML，去掉样式及属性，保留回车。
	 * @param txt
	 * @return
	 */
	public static String toHtml(String txt){
		if (txt == null){
			return "";
		}
		return replace(replace(Encodes.escapeHtml(txt), "\n", "<br/>"), "\t", "    ");
	}

	/**
	 * 缩略字符串（不区分中英文字符）
	 * @param str 目标字符串
	 * @param length 截取长度
	 * @return
	 */
	public static String abbr(String str, int length) {
		if (str == null) {
			return "";
		}
		try {
			StringBuilder sb = new StringBuilder();
			int currentLength = 0;
			for (char c : replaceHtml(StringEscapeUtils.unescapeHtml4(str)).toCharArray()) {
				currentLength += String.valueOf(c).getBytes("GBK").length;
				if (currentLength <= length - 3) {
					sb.append(c);
				} else {
					sb.append("...");
					break;
				}
			}
			return sb.toString();
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		return "";
	}
	
	public static String abbr2(String param, int length) {
		if (param == null) {
			return "";
		}
		StringBuffer result = new StringBuffer();
		int n = 0;
		char temp;
		boolean isCode = false; // 是不是HTML代码
		boolean isHTML = false; // 是不是HTML特殊字符,如 
		for (int i = 0; i < param.length(); i++) {
			temp = param.charAt(i);
			if (temp == '<') {
				isCode = true;
			} else if (temp == '&') {
				isHTML = true;
			} else if (temp == '>' && isCode) {
				n = n - 1;
				isCode = false;
			} else if (temp == ';' && isHTML) {
				isHTML = false;
			}
			try {
				if (!isCode && !isHTML) {
					n += String.valueOf(temp).getBytes("GBK").length;
				}
			} catch (UnsupportedEncodingException e) {
				e.printStackTrace();
			}

			if (n <= length - 3) {
				result.append(temp);
			} else {
				result.append("...");
				break;
			}
		}
		// 取出截取字符串中的HTML标记
		String temp_result = result.toString().replaceAll("(>)[^<>]*(<?)",
				"$1$2");
		// 去掉不需要结素标记的HTML标记
		temp_result = temp_result
				.replaceAll(
						"</?(AREA|BASE|BASEFONT|BODY|BR|COL|COLGROUP|DD|DT|FRAME|HEAD|HR|HTML|IMG|INPUT|ISINDEX|LI|LINK|META|OPTION|P|PARAM|TBODY|TD|TFOOT|TH|THEAD|TR|area|base|basefont|body|br|col|colgroup|dd|dt|frame|head|hr|html|img|input|isindex|li|link|meta|option|p|param|tbody|td|tfoot|th|thead|tr)[^<>]*/?>",
						"");
		// 去掉成对的HTML标记
		temp_result = temp_result.replaceAll("<([a-zA-Z]+)[^<>]*>(.*?)</\\1>",
				"$2");
		// 用正则表达式取出标记
		Pattern p = Pattern.compile("<([a-zA-Z]+)[^<>]*>");
		Matcher m = p.matcher(temp_result);
		List<String> endHTML = Lists.newArrayList();
		while (m.find()) {
			endHTML.add(m.group(1));
		}
		// 补全不成对的HTML标记
		for (int i = endHTML.size() - 1; i >= 0; i--) {
			result.append("</");
			result.append(endHTML.get(i));
			result.append(">");
		}
		return result.toString();
	}
	
	/**
	 * 转换为Double类型
	 */
	public static Double toDouble(Object val){
		if (val == null){
			return 0D;
		}
		try {
			return Double.valueOf(trim(val.toString()));
		} catch (Exception e) {
			return 0D;
		}
	}

	/**
	 * 转换为Float类型
	 */
	public static Float toFloat(Object val){
		return toDouble(val).floatValue();
	}

	/**
	 * 转换为Long类型
	 */
	public static Long toLong(Object val){
		return toDouble(val).longValue();
	}

	/**
	 * 转换为Integer类型
	 */
	public static Integer toInteger(Object val){
		return toLong(val).intValue();
	}
	
	/**
	 * 获得i18n字符串
	 */
	public static String getMessage(String code, Object[] args) {
		LocaleResolver localLocaleResolver = (LocaleResolver) SpringContextHolder.getBean(LocaleResolver.class);
		HttpServletRequest request = ((ServletRequestAttributes)RequestContextHolder.getRequestAttributes()).getRequest();  
		Locale localLocale = localLocaleResolver.resolveLocale(request);
		return SpringContextHolder.getApplicationContext().getMessage(code, args, localLocale);
	}
	
	/**
	 * 获得用户远程地址
	 */
	public static String getRemoteAddr(HttpServletRequest request){
		String remoteAddr = request.getHeader("X-Real-IP");
        if (isNotBlank(remoteAddr)) {
        	remoteAddr = request.getHeader("X-Forwarded-For");
        }else if (isNotBlank(remoteAddr)) {
        	remoteAddr = request.getHeader("Proxy-Client-IP");
        }else if (isNotBlank(remoteAddr)) {
        	remoteAddr = request.getHeader("WL-Proxy-Client-IP");
        }
        return remoteAddr != null ? remoteAddr : request.getRemoteAddr();
	}

	/**
	 * 驼峰命名法工具
	 * @return
	 * 		toCamelCase("hello_world") == "helloWorld" 
	 * 		toCapitalizeCamelCase("hello_world") == "HelloWorld"
	 * 		toUnderScoreCase("helloWorld") = "hello_world"
	 */
    public static String toCamelCase(String s) {
        if (s == null) {
            return null;
        }

        s = s.toLowerCase();

        StringBuilder sb = new StringBuilder(s.length());
        boolean upperCase = false;
        for (int i = 0; i < s.length(); i++) {
            char c = s.charAt(i);

            if (c == SEPARATOR) {
                upperCase = true;
            } else if (upperCase) {
                sb.append(Character.toUpperCase(c));
                upperCase = false;
            } else {
                sb.append(c);
            }
        }

        return sb.toString();
    }

    /**
	 * 驼峰命名法工具
	 * @return
	 * 		toCamelCase("hello_world") == "helloWorld" 
	 * 		toCapitalizeCamelCase("hello_world") == "HelloWorld"
	 * 		toUnderScoreCase("helloWorld") = "hello_world"
	 */
    public static String toCapitalizeCamelCase(String s) {
        if (s == null) {
            return null;
        }
        s = toCamelCase(s);
        return s.substring(0, 1).toUpperCase() + s.substring(1);
    }
    
    /**
	 * 驼峰命名法工具
	 * @return
	 * 		toCamelCase("hello_world") == "helloWorld" 
	 * 		toCapitalizeCamelCase("hello_world") == "HelloWorld"
	 * 		toUnderScoreCase("helloWorld") = "hello_world"
	 */
    public static String toUnderScoreCase(String s) {
        if (s == null) {
            return null;
        }

        StringBuilder sb = new StringBuilder();
        boolean upperCase = false;
        for (int i = 0; i < s.length(); i++) {
            char c = s.charAt(i);

            boolean nextUpperCase = true;

            if (i < (s.length() - 1)) {
                nextUpperCase = Character.isUpperCase(s.charAt(i + 1));
            }

            if ((i > 0) && Character.isUpperCase(c)) {
                if (!upperCase || !nextUpperCase) {
                    sb.append(SEPARATOR);
                }
                upperCase = true;
            } else {
                upperCase = false;
            }

            sb.append(Character.toLowerCase(c));
        }

        return sb.toString();
    }
 
    /**
     * 转换为JS获取对象值，生成三目运算返回结果
     * @param objectString 对象串
     *   例如：row.user.id
     *   返回：!row?'':!row.user?'':!row.user.id?'':row.user.id
     */
    public static String jsGetVal(String objectString){
    	StringBuilder result = new StringBuilder();
    	StringBuilder val = new StringBuilder();
    	String[] vals = split(objectString, ".");
    	for (int i=0; i<vals.length; i++){
    		val.append("." + vals[i]);
    		result.append("!"+(val.substring(1))+"?'':");
    	}
    	result.append(val.substring(1));
    	return result.toString();
    }
    
    public static boolean isNullOrEmpty(String value) {
        if (value == null || value.length() == 0) {
            return true;
        }
        return false;
    }
    
    public static boolean isNullOrEmpty(Object value) {
        if (value == null) {
            return true;
        }
        if (value.toString().length() == 0) {
            return true;
        }
        return false;
    }
    
}

（6）启动服务端 websocket 服务

//启动 websocket 服务
MyWebScoket.startWebsocketInstantMsg();

3、小程序端代码

进入小程序就连接服务端的websocket。需要在app.js中的添加代码：

//app.js
App({
  onLaunch: function () {
    var that = this;

    // 展示本地存储能力
    var logs = wx.getStorageSync('logs') || []
    logs.unshift(Date.now())
    wx.setStorageSync('logs', logs)

    // 登录
    wx.login({
      success: res => {
        //连接服务器
        console.log(that.globalData.socketStatus);
        if (that.globalData.socketStatus == 'closed') {
          console.log('启用websocket');
          that.openSocket();
        }
      }
    })
    
    // 获取用户信息
    wx.getSetting({
      success: res => {
        if (res.authSetting['scope.userInfo']) {
          // 已经授权，可以直接调用 getUserInfo 获取头像昵称，不会弹框
          wx.getUserInfo({
            success: res => {
              // 可以将 res 发送给后台解码出 unionId
              this.globalData.userInfo = res.userInfo
              console.log(res);
              // 由于 getUserInfo 是网络请求，可能会在 Page.onLoad 之后才返回
              // 所以此处加入 callback 以防止这种情况
              if (this.userInfoReadyCallback) {
                this.userInfoReadyCallback(res)
              }
            }
          })
        }
      }
    })
  },

  //开启websocket连接
  openSocket() {
    //打开时执行
    wx.onSocketOpen(() => {
      console.log('WebSocket 已连接')
      this.globalData.socketStatus = 'connected';//全局记录socket状态
      wx.setStorage({
        key: "socketStatus",
        data: 'connected'
      })
      this.sendMessage();//调用发消息方法
    })
    //断开时的执行
    wx.onSocketClose(() => {
      console.log('WebSocket 已断开');
      this.globalData.socketStatus = 'closed';
      clearInterval(this.globalData.i);
      wx.setStorage({
        key: "socketStatus",
        data: 'closed'
      })
    })
    //报错时执行
    wx.onSocketError(error => {
      console.error('socket error:', error);
    })
    // 监听服务器推送到微信小程序的消息
    wx.onSocketMessage(message => {
      console.log(message.data);   //websocket监听到服务端发的消息
	})

    // 连接Socket
    wx.connectSocket({
      url: 'wss://www.swandian.com/wss',
    })
  },

  //关闭Socke
  closeSocket() {
    if (this.globalData.socketStatus == 'connected') {
      wx.closeSocket({
        success: () => {
          this.globalData.socketStatus = 'closed'
        }
      })
    }
  },

  //发送消息
  sendMessage() {
    if (this.globalData.socketStatus === 'connected') {
      //自定义的发给后台识别的参数 ，我这里发送的是name
      wx.sendSocketMessage({
        data: "{\"name\":\"" + getApp().globalData.openid + "\"}"
      })
    }
  },
  // 定时发送消息方法，为了保持websocket的连接（因为服务器设置了当websocket一分钟内无消息自动断开连接）
  // sendCode: function (e) {
  //   var that = this;
  //   var i = setInterval(function () {
  //     that.sendMessage();
  //   }, 55000)
  // },

  //全局变量
  globalData: {
    openid: “”,
    socketStatus: 'closed',//websocket连接状态
    socketMessage: '',//socket消息内容
    code: null,
  }
})

4、发布及小程序端wss访问代理转发

1. Tomcat部署好后台项目
2. 申请域名，申请SSL证书，下载证书文件。
3. nginx 配置代理转发