Golang+Android基于HttpURLConnection实现的文件上传功能示例

本文实例讲述了golang+android基于httpurlconnection实现的文件上传功能。分享给大家供大家参考，具体如下：

这里要演示的是使用android程序作为客户端（使用httpurlconnection访问网络），golang程序作为服务器端，实现文件上传。

客户端代码：

public static string uploadfile(string uploadurl, string filepath) {
    log.v(tag, "url:" + uploadurl);
    log.v(tag, "filepath:" + filepath);
    string nextline = "\r\n";
    string dividerstart = "--";
    string boundary = "******";
    try {
      url url = new url(uploadurl);
      httpurlconnection connection = (httpurlconnection) url.openconnection();
      connection.setchunkedstreamingmode(1024 * 256);
      connection.setdoinput(true);
      connection.setdooutput(true);
      connection.setusecaches(false);
      connection.setrequestmethod("post");
      // 设置http请求头
      connection.setrequestproperty("connection", "keep-alive");
      connection.setrequestproperty("charset", "utf-8");
      //必须在content-type 请求头中指定分界符
      connection.setrequestproperty("content-type", "multipart/form-data;boundary=" + boundary);
      //定义数据写入流，准备上传文件
      dataoutputstream dos = new dataoutputstream(connection.getoutputstream());
      dos.writebytes(dividerstart + boundary + nextline);
      //设置与上传文件相关的信息
      dos.writebytes("content-disposition: form-data; name=\"file\"; filename=\""
          + filepath.substring(filepath.lastindexof("/") + 1) + "\"" + nextline);
      dos.writebytes(nextline);
      fileinputstream fis = new fileinputstream(filepath);
      byte[] buffer = new byte[1024 * 32];
      int count;
      // 读取文件内容，并写入outputstream对象
      while ((count = fis.read(buffer)) != -1) {
        dos.write(buffer, 0, count);
      }
      fis.close();
      dos.writebytes(nextline);
      dos.writebytes(dividerstart + boundary + dividerstart + nextline);
      dos.flush();
      // 开始读取从服务器传过来的信息
      inputstream is = connection.getinputstream();
      bufferedreader br = new bufferedreader(new inputstreamreader(is, "utf-8"));
      string result = br.readline();
      dos.close();
      is.close();
      connection.disconnect();
      return result;
    } catch (ioexception e) {
      e.printstacktrace();
    }
    return null;
}

服务器端代码：

package webserver
//接收客户端通过http上传的文件
//date: 2015-3-25 16:18:33
import (
    "fmt"
    "io/ioutil"
    "log"
    "net/http"
    "os"
)
func uploadbase() {
    fmt.println("this is uploadbase")
    http.handlefunc("/httpuploadfile", handleuploadfile)
    http.listenandserve(":8086", nil)
    if err != nil {
        fmt.println("listenandserve error: ", err.error())
    }
}
func handleuploadfile(w http.responsewriter, r *http.request) {
    fmt.println("client:", r.remoteaddr)
    file, fileheader, err := r.formfile("file")
    if err != nil {
        log.fatal("formfile:", err.error())
        return
    }
    defer func() {
        if err := file.close(); err != nil {
            log.fatal("close:", err.error())
            return
        }
    }()
    //文件名
    filename := fileheader.filename
    if filename == "" {
        log.fatal("param filename cannot be null.")
        return
    }
    //文件内容
    bytes, err := ioutil.readall(file)
    //写到服务端本地文件中
    outputfilepath := "/home/admin/桌面/" + filename
    err = ioutil.writefile(outputfilepath, bytes, os.modeperm)
    if err != nil {
        log.fatal("writefileerror:", err.error())
        return
    }
    w.write(([]byte)("上传文件成功！"))
}

更多关于android相关内容感兴趣的读者可查看本站专题：《android开发入门与进阶教程》、《android调试技巧与常见问题解决方法汇总》、《android基本组件用法总结》、《android视图view技巧总结》、《android布局layout技巧总结》及《android控件用法总结》

希望本文所述对大家android程序设计有所帮助。