微信小程序登录后台接口(java)

最近领导布置了小程序任务,开始做一个设备维护保养的项目对应小程序,前几天在画静态界面,一直以为很简单的事,真正做起来发现,想要做的好看好用还是挺不容易的。
今天开始做系统登录,因为要喝网页版应用同样数据库,所以把接口也写到了网页版工程中,后台为java接口,整个时序图网上查下很常见,api中也有。以下是我初步实现应用后台java接口获取openid和session_key返回,后面的应用实现随时补充,也是自己一个人在摸索,身边也没有可以请教的大神,感觉这个过程还是遇到不少坑,慢慢学习吧,多总结多试。
小程序部分:
my.wxml


  
    
    系统登录
  
  
  
    
      

      
    
  
   

my.wxss

page{
    height: 100%;
    color: #333;
    display: flex;
    flex-direction: column;
    font: normal 30rpx/1.68 -apple-system-font, 'Helvetica Neue', Helvetica, 'Microsoft YaHei', sans-serif;
}
.container {
    flex: 1;
    display: flex;
    flex-direction: column;
    box-sizing: border-box;
    background-color: #fafafa;
}

.my-item{
    border-bottom: 10rpx solid #fafafa;
  height: 50rpx;
    padding: 20rpx;
    /* background: #fff   98% 50% / auto 100rpx; */
  background: #fff;
  display: flex;
  flex-direction: row;
  position: relative;
}

.my-item-image{
    width:50px;
  height:50px;
  margin:10rpx 0 0 10rpx;
  float:left
}

.my-item-text{
  margin-left:150rpx;
  padding-top:-12px;
  font-size:38rpx;
  color:#656565;
  height:60px;
  display:block;
  line-height:60px;
}
.com-btn{
  height:40px;
  width:500rpx;
  margin-top:20px;
  font-color:#fff;
  background-color: #00aeee !important;
}

my.json:因为界面模版应用了vant,所以应用了登录输入的模版,怎么应用在api中有,直接拿来用:

{
  "navigationBarTitleText": "我的",
  "usingComponents": {
    "van-field": "../../dist/field/index"
  }
}

my.js

//获取应用实例
var app = getApp();
var requestUrl = app.globalData.requestUrl;
Page({
  data: {
    username: "",//输入用户名
    password: "",//输入密码
  },
 
  //输入用户名
  usernameinput: function(e) {
    this.setData({
      username: e.detail
    })
  },
  //输入密码
  passwordinput: function(e) {
    this.setData({
      password: e.detail
    })
  },

  //点击登陆的时候触发的事件
  login: function() {
    var that = this;
    //登陆的时候要传过来的参数
    var name = that.data.username;
    var pwd = that.data.password;
    if (that.data.username == "") {
      wx.showModal({
        title: "信息提示",
        content: "用户名不能为空!"
      })
    } else if (that.data.password == "") {
      wx.showModal({
        title: "信息提示",
        content: "请输入密码!"
      })
    }
    console.log("用户名:" + name + "密码:" + pwd)
    //微信登录
    wx.login({
      success: function(res) {
        if (res.code) {
          console.log("code=" + res.code)
          //发送ajax请求到服务器-登录
          wx.request({
            url: requestUrl,
            data: {
              userName: name,
              password: pwd,
              code: res.code,
              operFlag: 'getOpenid',
            },
            header: {
              'content-type': 'application/x-www-form-urlencoded' // 默认值
            },
            method: 'POST',
            dataType: 'json',
            success: function(res) {
              console.log(res)
              var status = JSON.stringify(res.data.status)
              var msg = JSON.stringify(res.data.msg)
              //弹出提示
              // wx.showModal({
              //   title: "信息提示",
              //   content: msg
              // })
              if (status == 0) {
                //跳转到index页面
                wx.switchTab({
                  url: '../index/index',
                })
              }
            },
            fail: function(res) {
              wx.showToast({
                title: '服务器网络错误,请稍后重试',
                icon: 'loading',
                duration: 1500
              })
            },
            complete: function(res) {
            },
          })
        }
      }
    })

  },
})

app.js:在这里定义了访问接口路径,我是在本地试,需要点击详情,最下方“不校验合法域名。。”打上勾。

image.png

java接口:
在web.xml中添加

    
        WechatService
        com.sibdp.portal.servlet.WechatServlet
    
    
        WechatService
        /wechat
      

servlet

package com.sibdp.portal.servlet;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.context.support.SpringBeanAutowiringSupport;

import com.cattsoft.framework.exception.SysException;
import com.cattsoft.system.service.ISysUserService;

public class WechatServlet extends HttpServlet {
    private Logger logger = LoggerFactory.getLogger(WechatServlet.class);
    
    @Autowired
    private ISysUserService sysUserService;
    private static final String APPID = "wxf7c1b1a493e153e4";//后续修改为对应APPID   
    private static final String SECRET = "e302ee388a5c65710e49a5aff883e2c5"; 
    
    public void init(ServletConfig config) throws ServletException {
        super.init(config);
        SpringBeanAutowiringSupport.processInjectionBasedOnServletContext(this,config.getServletContext());
    }
    
    protected void doGet(HttpServletRequest req, HttpServletResponse resp ) throws ServletException, IOException {
        logger.info("调用doGet方法");
        this.doPost(req, resp);
    }
    
    /**
     * 微信小程序调用接口
     * @param request,password,response                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
     * @return String
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        logger.debug("*******调用接口*********");
        String userName = request.getParameter("userName");//登录用户名
        String password = request.getParameter("password");//加密密码
//      String code = request.getParameter("code");//小程序临时登录凭证
        String operFlag = request.getParameter("operFlag");
        logger.debug("userName="+userName+";password="+password+";");
        String results = "";
        RestTemplate restTemplate = new RestTemplate();  
        //进行网络请求,访问url接口  
//        ResponseEntity  responseEntity = restTemplate.exchange(url, HttpMethod.GET, null, String.class);    
        try {
            if("getOpenid".equals(operFlag)){
                String code = request.getParameter("code");   //拿到微信小程序传过来的code
                System.out.println(code);
                String url = "https://api.weixin.qq.com/sns/jscode2session?appid=" + APPID + "&secret=" + SECRET
                        + "&js_code=" + code + "&grant_type=authorization_code";   //接口地址
                System.out.println("url:"+url);
                results = sendGetReq(url);// 发送http请求
                System.out.println("results"+results);
            }
        } catch (SysException e) {
            e.printStackTrace();
        } 
        response.setContentType("application/json;charset=UTF-8");
        response.setHeader("catch-control", "no-catch");
        PrintWriter pw = response.getWriter();
        pw.print(results);
        pw.flush();
        pw.close();
    }
    
    private String sendGetReq(String url) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url;
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立实际的连接
            connection.connect();
            // 获取所有响应头字段
            java.util.Map> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送GET请求出现异常!" + e);
            e.printStackTrace();
        } // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }
    
}

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