「小程序JAVA实战」小程序头像图片上传（下）（45）

转自：https://idig8.com/2018/09/09/xiaochengxujavashizhanxiaochengxutouxiangtupianshangchuan44/

接下来，我们应该通过用户的id，调用后端的接口，查询出来点赞的数量，关注的数量，粉丝数量，直接更新头像图片。源码：https://github.com/limingios/wxProgram.git 中wx-springboot 和 No.15

后端开发

spring boot-service 增加通过user的id，获得Users的方法

• UserService.java

package com.idig8.service;
import com.idig8.pojo.Users;
public interface UserService {
    /**
     * 判断用户名是否存在
     * @param username
     * @return
     */
    public boolean queryUsernameIsExist(String username);
    /**
     * 保存用户
     * @param user
     * @return
     */
    public void saveUser(Users user);
    /**
     * 查询用户对象
     * @param username
     * @return
     */
    public Users queryUserIsExist(Users user);
    /**
     * 更新对象
     * @param username
     * @return
     */
    public void updateUser(Users user);
    /**
     * userId查询用户对象
     * @param username
     * @return
     */
    public Users queryUserId(String userId);
}

• UserServiceImpl.java

package com.idig8.service;
import org.n3r.idworker.Sid;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.security.SecurityProperties.User;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
import com.idig8.mapper.UsersMapper;
import com.idig8.pojo.Users;
import com.idig8.utils.MD5Utils;
import tk.mybatis.mapper.entity.Example;
import tk.mybatis.mapper.entity.Example.Criteria;
@Service
public class UserServiceImpl implements UserService {
    @Autowired
    private UsersMapper usersMapper;
    @Autowired
    private Sid sid;
    @Transactional(propagation =Propagation.SUPPORTS)
    @Override
    public boolean queryUsernameIsExist(String username) {
        Users user = new Users();
        user.setUsername(username);
        Users result = usersMapper.selectOne(user);
        return result==null? false:true;
    }
    @Transactional(propagation =Propagation.REQUIRED)
    @Override
    public void saveUser(Users user) {
        String userId =sid.nextShort();
        user.setId(userId);
        usersMapper.insert(user);
    }
    @Transactional(propagation =Propagation.SUPPORTS)
    @Override
    public Users queryUserIsExist(Users user) {
        Example queryExample = new Example(Users.class);
        Criteria criteria = queryExample.createCriteria();
        criteria.andEqualTo("username",user.getUsername());
        try {
            criteria.andEqualTo("password",MD5Utils.getMD5Str(user.getPassword()));
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        Users userOne =  usersMapper.selectOneByExample(queryExample);
        return userOne;
    }
    @Transactional(propagation =Propagation.REQUIRED)
    @Override
    public void updateUser(Users user) {
        Example userExample = new Example(Users.class);
        Criteria criteria = userExample.createCriteria();
        criteria.andEqualTo("id", user.getId());
        usersMapper.updateByExampleSelective(user, userExample);
    }
    @Transactional(propagation =Propagation.SUPPORTS)
    @Override
    public Users queryUserId(String userId){
        Example queryExample = new Example(Users.class);
        Criteria criteria = queryExample.createCriteria();
        criteria.andEqualTo("id",userId);
        Users userOne =  usersMapper.selectOneByExample(queryExample);
        return userOne;
    }
}

• spring boot -api 中 在UserController中添加方法

增加controller 接口，传递user中的id参数

package com.idig8.controller;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import com.idig8.pojo.Users;
import com.idig8.pojo.vo.UsersVO;
import com.idig8.service.UserService;
import com.idig8.utils.JSONResult;
import com.idig8.utils.file.FileUtil;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiImplicitParam;
import io.swagger.annotations.ApiImplicitParams;
import io.swagger.annotations.ApiOperation;
@RestController
@Api(value="用户接口",tags={"用户的controller"})
@RequestMapping(value = "/user")
public class UserController extends BasicController{
    @Autowired
    private UserService userService;
    @Value("${server.face.path}")
    private String fileSpace;
    @ApiOperation(value="用户上传头像",notes="用户上传头像的接口")
    @ApiImplicitParams({
        @ApiImplicitParam(name="userId",value="用户id",required=true,dataType="String",paramType="query"),
        @ApiImplicitParam(name="file",value="文件上传",required=true,dataType="String",paramType="query"),
    })
    @PostMapping("/uploadFace")
    public JSONResult uploadFace(String userId,@RequestParam("file") MultipartFile file) {
        if (StringUtils.isBlank(userId)) {
            return JSONResult.errorMsg("用户id不能为空...");
        }
        // 文件保存的命名空间
        String fileName = file.getOriginalFilename();
        // 保存到数据库中的相对路径
        String path = "";
         try {
             path = FileUtil.uploadFile(file.getBytes(), fileSpace, fileName);
            } catch (Exception e) {
                e.getStackTrace();
                return JSONResult.errorMsg(e.getMessage());
            }
         Users user = new Users();
         user.setId(userId);
         user.setFaceImage(path);
         userService.updateUser(user);
        return JSONResult.ok(path);
    }
    @ApiOperation(value="通过用户Id获取用户信息",notes="通过用户Id获取用户信息的接口")
    @ApiImplicitParam(name="userId",value="用户id",required=true,dataType="String",paramType="query")
    @PostMapping("/queryByUserId")
    public JSONResult queryByUserId(String userId) {
        if (StringUtils.isBlank(userId)) {
            return JSONResult.errorMsg("用户id不能为空...");
        }
        Users user = userService.queryUserId(userId);
        UsersVO usersVO= new UsersVO();
        BeanUtils.copyProperties(user, usersVO);
        return JSONResult.ok(usersVO);
    }
}

• 运行后端项目，查看swagger2的效果

小程序开发

主要通过的是小程序生命周期中的onload方法，当进入页面的时候请求后台获取信息，用于页面的展示。

// pages/mine/mine.js
const app = getApp()
Page({
  /**
   * 页面的初始数据
   */
  data: {
    faceImage: "../../resource/images/noneface.png",
    nickname: "昵称",
    fansCounts: 0,
    followCounts: 0,
    receiveLikeCounts: 0,
  },
  /**
   * 用户注销
   */
  logout:function(e){
    var user = app.userInfo;
    wx.showLoading({
      title: '正在注销中。。。'
    });
    wx.request({
      url: app.serverUrl + "/logout?userId="+user.id,
      method: "POST",
      header: {
        'content-type': 'application/json' // 默认值
      },
      success: function (res) {
        console.log(res.data);
        var status = res.data.status;
        wx.hideLoading();
        if (status == 200) {
          wx.showToast({
            title: "用户注销成功~！",
            icon: 'none',
            duration: 3000
          })
          app.userInfo = null;
          wx.redirectTo({
            url: '../userRegister/userRegister',
          })
        } else if (status == 500) {
          wx.showToast({
            title: res.data.msg,
            icon: 'none',
            duration: 3000
          })
        }
      }
    })
  },
  /**
   * 头像上传
   */
  uploadFace:function(e){
    var user = app.userInfo;
    var me = this;
    wx.chooseImage({
      count: 1, // 默认9
      sizeType: ['compressed'], // 可以指定是原图还是压缩图，默认二者都有
      sourceType: ['album', 'camera'], // 可以指定来源是相册还是相机，默认二者都有
      success: function (res) {
        // 返回选定照片的本地文件路径列表，tempFilePath可以作为img标签的src属性显示图片
        var tempFilePaths = res.tempFilePaths
        if (tempFilePaths.length>0){
          console.log(tempFilePaths[0]);
              wx.uploadFile({
                url: app.serverUrl + "/user/uploadFace?userId=" + user.id, //仅为示例，非真实的接口地址
                filePath: tempFilePaths[0],
                name: 'file',
                success: function (res) {
                  var data = JSON.parse(res.data);
                  console.log(data);
                   wx.hideLoading();
                  if (data.status == 200) {
                    wx.showToast({
                      title: "用户上传成功~！",
                      icon: 'none',
                      duration: 3000
                    })
                    me.setData({
                      faceUrl: app.serverUrl+data.data
                    })
                  } else if (data.status == 500) {
                    wx.showToast({
                      title: data.msg,
                      icon: 'none',
                      duration: 3000
                    })
                  }
                }
              })
        }
      }
    })
  },
  /**
   * 生命周期函数--监听页面加载
   */
  onLoad: function (options) {
    var me = this;
    wx.showLoading({
      title: '正在获取用户信息。。。'
    });
    wx.request({
      url: app.serverUrl + "/user/queryByUserId?userId=" + app.userInfo.id,
      method: "POST",
      header: {
        'content-type': 'application/json' // 默认值
      },
      success: function (res) {
        console.log(res.data);
        var status = res.data.status;
        var userInfo = res.data.data;
        wx.hideLoading();
        var faceImage = me.data.faceUrl;
        if (userInfo.faceImage != null && userInfo.faceImage != '' && userInfo.faceImage!=undefined){
          faceImage = app.serverUrl +userInfo.faceImage;
        }
        me.setData({
          faceImage: faceImage,
          fansCounts: userInfo.fansCounts,
          followCounts: userInfo.followCounts,
          receiveLikeCounts: userInfo.receiveLikeCounts,
          nickname: userInfo.nickname
        })
      }
    })
  },
  /**
   * 生命周期函数--监听页面初次渲染完成
   */
  onReady: function () {
  },
  /**
   * 生命周期函数--监听页面显示
   */
  onShow: function () {
  },
  /**
   * 生命周期函数--监听页面隐藏
   */
  onHide: function () {
  },
  /**
   * 生命周期函数--监听页面卸载
   */
  onUnload: function () {
  },
  /**
   * 页面相关事件处理函数--监听用户下拉动作
   */
  onPullDownRefresh: function () {
  },
  /**
   * 页面上拉触底事件的处理函数
   */
  onReachBottom: function () {
  },
  /**
   * 用户点击右上角分享
   */
  onShareAppMessage: function () {
  }
})

PS：这个小程序获取用户信息和后端的一个联调。