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Android使用Volley实现上传文件功能

2019年07月30日  | 移动技术网IT编程  | 我要评论

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一个项目中用到的使用volley上传头像文件的例子，供大家参考，具体内容如下

/**
 * created by wangshihui on 2015/11/30.
 * 上传文件
 * url：.....
  method：post
  参数：file
  接口给的参数：file 就是表单的key，传给mfilepartname;
  这是个测试类，测试上传头像没有问题，适合只上传单个文件的场景
 */
public class multipartrequest extends request<jsonobject> {
  private string mheader;
  private map<string, string> mmap;
  private string cookiefromresp = "";
  private map<string, string> headermap = new hashmap<>();
  private multipartentity entity = new multipartentity();
  private final response.listener<jsonobject> mlistener;
  private final file mfilepart;
  private string mfilepartname;

  /**
   * @param url
   * @param listener
   * @param errorlistener
   * @param file_name
   * @param file
   */
  public multipartrequest(string url, response.listener<jsonobject> listener, response.errorlistener errorlistener, string file_name,file file)
  {
    super(method.post, url, errorlistener);
    mlistener = listener;
    mfilepart = file;
    mfilepartname=file_name;
    buildmultipartentity();
  }

  /**
   * 添加文件参数
   */
  private void buildmultipartentity()
  {
    entity.addpart(mfilepartname, new filebody(mfilepart));
  }

  @override
  public string getbodycontenttype()
  {
    return entity.getcontenttype().getvalue();
  }

  @override
  public byte[] getbody() throws authfailureerror
  {
    bytearrayoutputstream bos = new bytearrayoutputstream();
    try
    {
      entity.writeto(bos);
    }
    catch (ioexception e)
    {
      volleylog.e("ioexception writing to bytearrayoutputstream");
    }
    return bos.tobytearray();
  }

  /**
   * @param response
   * @return
   */
  @override
  protected response<jsonobject> parsenetworkresponse(networkresponse response)
  {
    try {
    jsonobject jsonobject;
    system.out.println(response.headers.tostring());
    if (response.data.length != 0) {
      string jsonstring = new string(response.data, httpheaderparser.parsecharset(response.headers));
      jsonobject = new jsonobject(jsonstring);
    } else {
      jsonobject = new jsonobject();
    }
    //获取数据头
    mheader = response.headers.tostring();
    //提取cookie(jsessionid)
    pattern pattern = pattern.compile("set-cookie=.*?;");
    matcher matcher = pattern.matcher(mheader);
    if (matcher.find()) {
      cookiefromresp = matcher.group();
      cookiefromresp = cookiefromresp.substring(11, cookiefromresp.length() - 1);
      system.out.println("cookie: " + cookiefromresp);
    }
    jsonobject.put("cookie", cookiefromresp);
    return response.success(jsonobject,
        httpheaderparser.parsecacheheaders(response));
  } catch (unsupportedencodingexception e) {
    return response.error(new parseerror(e));
  } catch (jsonexception je) {
    return response.error(new parseerror(je));
  }
  }

  /**
   * @param response
   */
  @override
  protected void deliverresponse(jsonobject response)
  {
    mlistener.onresponse(response);
  }

  @override
  protected map<string, string> getparams() throws authfailureerror {
    return mmap;
  }

  /**
   * @return
   * @throws authfailureerror
   */
  @override
  public map<string, string> getheaders() throws authfailureerror {
    return headermap;
  }

  /**
   * @return
   */
  @override
  public retrypolicy getretrypolicy() {
    retrypolicy retrypolicy = new defaultretrypolicy(5000, defaultretrypolicy.default_max_retries, defaultretrypolicy.default_backoff_mult);
    return retrypolicy;
  }

  /**
   * @param cookie
   */
  //将cookie加入数据头
  public void setsendcookie(string cookie) {
    headermap.put("cookie", cookie);
  }
}

调用方法如下：

//指定url路径
string url = "http://182.92.....";
multipartrequest multipartrequest = new multipartrequest(
    url, new response.listener<jsonobject>() {
  @override
  public void onresponse(jsonobject response) {
    savesessionid(response);    
  }
}, new response.errorlistener() {
  @override
  public void onerrorresponse(volleyerror e) {
    log.e(tag, e.getmessage(), e);
    try {
      byte[] htmlbodybytes = e.networkresponse.data;
      log.e(tag, new string(htmlbodybytes), e);
    } catch (exception e1) {
      e1.printstacktrace();
    }
    toastutil.showshorttoast(usercenteractivity.this, "网络连接异常");
  }
}, "file", mselectedpicturefile);
multipartrequest.setsendcookie(loadsessionid());
multipartrequest.settag(tag);
client.addtask(multipartrequest);

private file mselectedpicturefile;
mselectedpicturefile是一个file文件，参数名是file

通信成功保存cookie

savesessionid(response);  

发送请求上传cookie

multipartrequest.setsendcookie(loadsessionid());

client是一个volley的简单封装

protected asynhttpclient client;

public class asynhttpclient {

  //volley的请求队列
  private requestqueue requestqueue;
  //保证全局变量是单一的
  private static asynhttpclient instance;

  private context mcontext;

  private asynhttpclient(context context) {
    requestqueue = volley.newrequestqueue(context);
    this.mcontext = context;
  }
  /**
   * 单列模式，让asynhttpclient在整个项目中保持只有一个
   * @param context
   * @return
   */
  public static asynhttpclient getinstance(context context) {
    if (instance==null){
      synchronized (asynhttpclient.class){
        if (instance==null){
          instance=new asynhttpclient(context);
        }
      }
    }
    return instance;
  }

  /**
   * 添加任务到volley的请求队列中去，并不会立即执行
   * @param task
   */
  public void addtask(request task){
    requestqueue.add(task);
  }

  public requestqueue getrequestqueue() {
    return requestqueue;
  }
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持移动技术网。

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