Detailed explanation of how uploader uploads images to the server in seconds

This article mainly introduces the complete code of uploader to transfer pictures to the server in detail. It has certain reference value. Interested friends can refer to it. I hope it can help everyone.

Let’s take a look at the renderings first:

##js part of the page

var f1 = null; 
var picarr = new Array(); 
var basearr = new Array(); 
var lat = "", 
  longt = ""; 
var files = []; 
// 上传文件 
function upload() { 
   
   
  var wt = plus.nativeUI.showWaiting(); 
  var task = plus.uploader.createUpload(server + "?action=dynamicadd", { 
      method: "POST" 
    }, 
    function(t, status) { //上传完成 
      if (status == 200) { 
//           console.log("上传成功：" + t.responseText); 
        mui.toast("发表成功"); 
        //插入本地数据库 
        wt.close(); 
        mui.back(); 
      } else { 
        console.log("上传失败：" + status); 
        wt.close(); 
      } 
    } 
  ); 
  var title = $("#tbxtitle").val(); 
  if (title.length < 1) { 
    wt.close(); 
    mui.toast("内容不能为空"); 
  } else {  
    task.addData("title", title); 
    task.addData("uid", getUid()); 
    task.addData("userid", plus.storage.getItem("policeid")); 
    //task.addData("lat", lat.toString()); 
    //task.addData("longt", longt.toString()); 
//       console.log("准备上传"+files.length+"个图片"); 
    for (var i = 0; i < files.length; i++) { 
      var f = files[i]; 
//         console.log("准备上传的图片路径："+f.path); 
      task.addFile(f.path, { 
        key: f.name 
      }); 
    } 
    task.start(); 
  } 
   
} 
 
// 添加文件 
var index = 1; 
var newUrlAfterCompress; 
function appendFile(p) { 
  files.push({ 
    name: "uploadkey" + index,//这个值服务器会用到，作为file的key 
    path: p 
  }); 
  index++; 
} 
// 产生一个随机数 
function getUid() { 
  return Math.floor(Math.random() * 100000000 + 10000000).toString(); 
} 
 
function getposition() { 
  plus.geolocation.getCurrentPosition(function(p) { 
    var codns = p.coords; // 获取地理坐标信息； 
    lat = codns.latitude; //获取到当前位置的纬度； 
    longt = codns.longitude; //获取到当前位置的经度 
  }, function(e) { 
    //alert("获取百度定位位置信息失败：" + e.message); 
  }, { 
    provider: &#39;baidu&#39; 
  }); 
} 
 
function galleryImgs() { // 从相册中选择图片 
  plus.gallery.pick(function(e) { 
    $(".dynamic_images ul li").remove(".pickimg"); 
//       console.log("选择了"+e.files.length+"个图片"); 
    for (var i = 0; i < e.files.length; i++) { 
      if (i < 9) { 
        picarr[i] = e.files[i]; 
        $(".dynamic_images ul").prepend("<li class=&#39;pickimg&#39;><img src=&#39;" + e.files[i] + "&#39; /></li>"); 
        var dstname="_downloads/"+getUid()+".jpg";//设置压缩后图片的路径 
        newUrlAfterCompress=compressImage(e.files[i],dstname); 
        appendFile(dstname); 
        //console.log(e.files[i]); 
        //console.log(dstname); 
      } 
    } 
  }, function(e) { 
    console.log("取消选择图片"); 
  }, { 
    filter: "image", 
    multiple: true 
  }); 
} 
 
//压缩图片，这个比较变态的方法，无法return 
function compressImage(src,dstname) { 
  //var dstname="_downloads/"+getUid()+".jpg"; 
  plus.zip.compressImage({ 
      src: src, 
      dst: dstname, 
      overwrite:true, 
      quality: 20 
    }, 
    function(event) { 
      //console.log("Compress success:"+event.target); 
      return event.target; 
    }, 
    function(error) { 
      console.log(error); 
      return src; 
      //alert("Compress error!"); 
    }); 
   
} 
//旋转图片，本文没用到 
function rotateImage() { 
  plus.zip.compressImage({ 
      src: "_www/a.jpg", 
      dst: "_doc/a.jpg", 
      rotate: 90 // 旋转90度 
    }, 
    function() { 
      alert("Compress success!"); 
    }, 
    function(error) { 
      alert("Compress error!"); 
    }); 
} 
 
function showActionSheet() { 
  var bts = [{ 
    title: "拍照" 
  }, { 
    title: "从相册选择" 
  }]; 
  plus.nativeUI.actionSheet({ 
      cancel: "取消", 
      buttons: bts 
    }, 
    function(e) { 
      if (e.index == 1) { 
        getImage(); 
      } else if (e.index == 2) { 
        galleryImgs(); 
      } 
    } 
  ); 
} 
//拍照 
function getImage() { 
  var cmr = plus.camera.getCamera(); 
  cmr.captureImage(function(p) { 
    plus.io.resolveLocalFileSystemURL(p, function(entry) { 
      var localurl = entry.toLocalURL(); // 
      $(".dynamic_images ul li").remove(".pickimg"); 
      $(".dynamic_images ul").prepend("<li class=&#39;pickimg&#39;><img src=&#39;" + localurl + "&#39; /></li>"); 
    }); 
  }); 
}

Some operations for page initialization:

##

document.addEventListener("plusready", plusReady, false); 
 
function plusReady() { 
  document.getElementById("addnew").addEventListener("tap", function() { 
    showActionSheet();//拍照还是相册 
  }); 
  document.getElementById("fabiao").addEventListener("tap", function() { 
    upload();//上传文件 
  }); 
  plus.nativeUI.closeWaiting(); 
 
}

html layout, relatively simple, imitating WeChat:

<p class="dynamic_images"> 
  <ul> 
    <!--<li><img src="images/cbd.jpg"></li>--> 
    <li><img src="images/iconfont-tianjia.png" id="addnew"></li> 
    <!--<li><span class="mui-icon iconfont icon-jia2" style="font-size: 28px;"></span></li>--> 
 
  </ul> 
</p>

Server asp.net version

string file = ""; 
int count = Request.Files.Count; 
 
for (int i = 0; i < count; i++) 
{ 
  int l = Request.Files["uploadkey" + (i + 1)].ContentLength; 
  byte[] buffer = new byte[l]; 
  Stream s = Request.Files["uploadkey" + (i + 1)].InputStream; 
  System.Drawing.Bitmap image = new System.Drawing.Bitmap(s); 
  string imgname = Common.GetGuid() + ".jpg"; 
  string path = "Images/" + DateTime.Now.ToString("yyyyMMdd") + "/"; 
  if (!Directory.Exists(HttpContext.Current.Server.MapPath(path))) 
  { 
    System.IO.Directory.CreateDirectory(HttpContext.Current.Server.MapPath(path)); 
  } 
  image.Save(Server.MapPath(path + "/" + imgname)); 
}

The speed is very fast, tested , the speed will not drop significantly if it is not compressed, but considering the problem of loading during display, compression is still performed.

The CSS added later has no style:

<style type="text/css"> 
  .dynamic_images { 
    width: 100%; 
  } 
   
  .dynamic_images ul { 
    margin: 0; 
    padding: 0; 
  } 
   
  .dynamic_images ul li { 
    float: left; 
    list-style: none; 
    width: 25%; 
  } 
   
  .dynamic_images ul li img { 
    width: 98%; 
    height: 80px; 
  } 
</style>

The plus sign is the font: http://iconfont.cn/

Header The style is a secondary modification of the HB style. If you are not developing with HB, you can just write the CSS yourself.

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