java web实现video播放

1.前端的实现

通过getQueryVariable获取url的参数（vid )

function getQueryVariable(variable){ 
   
    var query = window.location.search.substring(1); 
    var vars = query.split("&"); 
    for (var i=0;i<vars.length;i++){ 
   
        var pair = vars[i].split("="); 
        if(pair[0] == variable){ 
   return pair[1];}
     }
        return(false);
  }
     var data={ 
    vid:getQueryVariable("vid") };

在single播放页加入播放控件

<!--播放--> 
<video id ="video_iframe" src ="#"controls = "controls"style="..."class="video- grid-single-page-agileits"width="750" height="400"></video>

通过ajax上传获取的vid值和播放控件实现服务器的数据交换，实现网页布局更新

$.ajax({ 
   url:"/getvideobyid",
       type:"post",
       data:data,
       dataType:"json", 
       success:function (result) { 
   
            // 取id="video_iframe",调用后台反过来的videopath路径，实现播放功能 
            $("#video_iframe").attr("src","http://192.168.5.103/"+result.videopath);   
            $("#myname").html(result.name); } 
       });

在index页面实现跳转事件

<a href="single.html?vid=${movie.vid}" class="hvr-shutter-out-horizontal">

2.后台实现对数据的查询等交互功能

接收网页传过来的vid值

String vid = req.getParameter("vid");//1`

VideoDao实现：通过vid查找并返回数据库中的movie对象

public class VideoDao extends BaseDao { 
   
   public Movie queryVideo(String vid){ 
   
      String sql = "select * from video where vid = ?";
        List<Map<String,Object>> maps = super.queryAnything(sql,vid); 
        String name = String.valueOf(maps.get(0).get("name")); 
        String author = String.valueOf(maps.get(0).get("author"));
        String imagepath = String.valueOf(maps.get(0).get("imagepath")); 
        String videopath =String.valueOf(maps.get(0).get("videopath")); 
        Timestamp time =Timestamp.valueOf(maps.get(0).get("createtime").toString()); 
        String type= String.valueOf(maps.get(0).get("type"));

        Movie movie = new Movie(); 
        movie.setCreatetime(time);
        movie.setVideopath(videopath);
        movie.setImagepath(imagepath);
        movie.setType(type);
        movie.setAuthor(author);
        movie.setName(name);

        return movie; 
        } 
   }

在VideoService中定义

public interface VideoService { 
    
    public Movie queryMovieById(String vid); 
}

在VideoServiceImpl定义

//queryMovieById实现通过vid查找并返回相对应的movie对象 
public class VideoServiceImpl implements VideoService{ 
    
   @Override public Movie queryMovieById(String vid) { 
   
       VideoDao videoDao = new VideoDao(); 
       Movie movie = videoDao.queryVideo(vid); 
       return movie; 
       } 
   }

VideoPlayServlet实现返回查询结果（movie）给网页

public class VideoPlayServelet extends HttpServlet { 
   
   @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws   ServletException, IOException { 
    
    resp.setCharacterEncoding("utf-8");
    String vid = req.getParameter("vid");//1 
    VideoService videoService = new VideoServiceImpl(); 
    Movie movie = videoService.queryMovieById(vid); 
    //ajax json 数据在网络上传输都是字符串
    Gson gson = new Gson();
    String result = gson.toJson(movie); 
     //将数据返给客户
    resp.getWriter().write(result); 
    }
}