http://www.51sjk.com/Upload/Articles/1/0/291/291724_20210728120045439.jpg，

  //1. url
    url url = new url("http://www.51sjk.com/Upload/Articles/1/0/291/291724_20210728120045439.jpg");
    //2. httpurlconnection
    httpurlconnection conn=(httpurlconnection)url.openconnection();
    //3. set(get)
    conn.setrequestmethod("get");
    //4. getinputstream
    inputstream is = conn.getinputstream();
    //5. 解析is，获取responsetext，这里用缓冲字符流
    bufferedreader reader = new bufferedreader(new inputstreamreader(is));
    stringbuilder sb = new stringbuilder();
    string line = null;
    while((line=reader.readline()) != null){
      sb.append(line);
    }
    //获取响应文本
    string responsetext = sb.tostring();

//1. url
    url url = new url("http://www.51sjk.com/Upload/Articles/1/0/291/291724_20210728120045455.jpg");
    //2. httpurlconnection
    httpurlconnection conn = (httpurlconnection)url.openconnection();
    //3. post
    conn.setrequestmethod("post");
    //4. content-type,这里是固定写法，发送内容的类型
    conn.setrequestproperty("content-type", "application/x-www-form-urlencoded");
    //5. output，这里要记得开启输出流，将自己要添加的参数用这个输出流写进去，传给服务端，这是socket的基本结构
    conn.setdooutput(true);
    outputstream os = conn.getoutputstream();
    string param = "tn=baiduimage&ipn=r&ct=201326592&cl=2&lm=-1&st=-1&fm=index&fr=&sf=1&fmq=&pv=&ic=0&nc=1&z=&se=1&showtab=0&fb=0&width=&height=&face=0&istype=2&ie=utf-8&word=%e5%8a%a8%e6%bc%ab";
    //一定要记得将自己的参数转换为字节，编码格式是utf-8
    os.write(param.getbytes("utf-8"));
    os.flush();
    //6. is
    inputstream is = conn.getinputstream();
    //7. 解析is，获取responsetext
    bufferedreader reader = new bufferedreader(new inputstreamreader(is));
    stringbuilder sb = new stringbuilder();
    string line = null;
    while((line=reader.readline()) != null){
      sb.append(line);
    }
    //获取响应文本
    string responsetext = sb.tostring();

  //1. 创建requestqueue,这是一个请求队列，相当于消息机制处理
  private requestqueue  mqueue = volley.newrequestqueue(this);
    //2. stringrequest
    string url = "http://www.51sjk.com/Upload/Articles/1/0/291/291724_20210728120045455.com";
    stringrequest req = new stringrequest(url, 
        new listener<string>() {
          //请求成功后回调 在主线程中执行
          public void onresponse(string responsetext) {
            //解析json 封装结果数据
            gson gson = new gson();
            //这里用的gson解析json字符串      
            user result=gson.fromjson(responsetext,requestresult.class);
                      }
        }, new errorlistener() {
          //请求出错时 执行回调 在主线程中执行
          public void onerrorresponse(volleyerror error) {
            error.printstacktrace();
          }
        });
  //把req 添加到 请求队列中，一定要记得这一步，不然就相当于没有发送请求
    mqueue.add(req);

private requestqueue mqueue; 
//post请求要用commonrequest请求实现
  string url="www.baidu.com";
  commonrequest request = new commonrequest(request.method.post,url,new response.listener<string>() {
      public void onresponse(string response) {
        try {
        //这里是请求成功后调用的接口，用json工具解析数据
          jsonobject obj = new jsonobject(response);
        } catch (jsonexception e) {
          e.printstacktrace();
        }
      }
    },new response.errorlistener() {
      public void onerrorresponse(volleyerror error) {
      }
    }){
      //如果用post请求，要添加参数，一定要重写这个方法来添加参数
      @override
      protected map<string, string> getparams() throws authfailureerror {
        map<string, string> resultmap = new hashmap<string, string>();
        //这里的添加的具体参数   resultmap.put("username",user.getname());
        resultmap.put("userage",user.getage());
        resultmap.put("usergender",user.getgender());
resultmap.put("userschool",user.getschool());
        return resultmap;
      }
    };
    mqueue.add(request);
  }

//第一步，新建一个请求参数对象
requestparams params=new requestparams("www.baidu.com?inm=2");
//直接调用x.http().get()方法，这里注意x是要用全局myapplication中初始化后才可以使用，初始化方法为x.ext.init(this)
    x.http().get(params, new callback.commoncallback<string>() {
      @override
      public void oncancelled(cancelledexception arg0) {
      }
      @override
      public void onerror(throwable arg0, boolean arg1) {
        log.i("hap.zhu", "http_on_error,请求网络数据失败");
      }
      @override
      public void onfinished() {
      }
      @override
      public void onsuccess(string result) {
        log.i("hap.zhu", "请求数据结果为:"+result);
        gson gson=new gson();
        result result=gson.fromjson(result,result.class);
        log.i("hap.zhu", "加载结果为:"+result.tostring());
    }
    });

//方法同get，就是这么简单，网络请求成功会回调监听器里的success接口，直接处理数据结果就行
  requestparams params=new requestparams("www.baidu.com");
    params.addbodyparameter("email", username);
    params.addbodyparameter("password", password);
    x.http().post(params, new commoncallback<string>() {
      @override
      public void oncancelled(cancelledexception arg0) {
      }
      @override
      public void onerror(throwable arg0, boolean arg1) {
        //网络错误也会提示错误
        callback.error(arg0.tostring());
      }
      @override
      public void onfinished() {
      }
      @override
      public void onsuccess(string result) {
        gson gson=new gson();
      loginresult loginresult=gson.fromjson(result, loginresult.class);