本文实例讲述了android使用post方式上传图片到服务器的方法。分享给大家供大家参考，具体如下：
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/**
* 上传文件到服务器类
*
* @author tom
*/
public class uploadutil {
private static final string tag = "uploadfile";
private static final int time_out = 10 * 1000; // 超时时间
private static final string charset = "utf-8"; // 设置编码
/**
* android上传文件到服务端
*
* @param file 需要上传的文件
* @param requesturl 请求的rul
* @return 返回响应的内容
*/
public static string uploadfile(file file, string requesturl) {
string result = null;
string boundary = uuid.randomuuid().tostring(); // 边界标识 随机生成
string prefix = "--", line_end = "\r\n";
string content_type = "multipart/form-data"; // 内容类型
try {
url url = new url(requesturl);
httpurlconnection conn = (httpurlconnection) url.openconnection();
conn.setreadtimeout(time_out);
conn.setconnecttimeout(time_out);
conn.setdoinput(true); // 允许输入流
conn.setdooutput(true); // 允许输出流
conn.setusecaches(false); // 不允许使用缓存
conn.setrequestmethod("post"); // 请求方式
conn.setrequestproperty("charset", charset); // 设置编码
conn.setrequestproperty("connection", "keep-alive");
conn.setrequestproperty("content-type", content_type + ";boundary=" + boundary);
if (file != null) {
/**
* 当文件不为空，把文件包装并且上传
*/
dataoutputstream dos = new dataoutputstream(conn.getoutputstream());
stringbuffer sb = new stringbuffer();
sb.append(prefix);
sb.append(boundary);
sb.append(line_end);
/**
* 这里重点注意： name里面的值为服务端需要key 只有这个key 才可以得到对应的文件
* filename是文件的名字，包含后缀名的 比如:abc.png
*/
sb.append("content-disposition: form-data; name=\"uploadfile\"; filename=\""
+ file.getname() + "\"" + line_end);
sb.append("content-type: application/octet-stream; charset=" + charset + line_end);
sb.append(line_end);
dos.write(sb.tostring().getbytes());
inputstream is = new fileinputstream(file);
byte[] bytes = new byte[1024];
int len = 0;
while ((len = is.read(bytes)) != -1) {
dos.write(bytes, 0, len);
}
is.close();
dos.write(line_end.getbytes());
byte[] end_data = (prefix + boundary + prefix + line_end).getbytes();
dos.write(end_data);
dos.flush();
/**
* 获取响应码 200=成功 当响应成功，获取响应的流
*/
int res = conn.getresponsecode();
log.e(tag, "response code:" + res);
// if(res==200)
// {
log.e(tag, "request success");
inputstream input = conn.getinputstream();
stringbuffer sb1 = new stringbuffer();
int ss;
while ((ss = input.read()) != -1) {
sb1.append((char) ss);
}
result = sb1.tostring();
log.e(tag, "result : " + result);
// }
// else{
// log.e(tag, "request error");
// }
}
} catch (malformedurlexception e) {
e.printstacktrace();
} catch (ioexception e) {
e.printstacktrace();
}
return result;
}
/**
* 通过拼接的方式构造请求内容，实现参数传输以及文件传输
*
* @param url service net address
* @param params text content
* @param files pictures
* @return string result of service response
* @throws ioexception
*/
public static string post(string url, map<string, string> params, map<string, file> files)
throws ioexception {
string boundary = java.util.uuid.randomuuid().tostring();
string prefix = "--", linend = "\r\n";
string multipart_from_data = "multipart/form-data";
string charset = "utf-8";
url uri = new url(url);
httpurlconnection conn = (httpurlconnection) uri.openconnection();
conn.setreadtimeout(10 * 1000); // 缓存的最长时间
conn.setdoinput(true);// 允许输入
conn.setdooutput(true);// 允许输出
conn.setusecaches(false); // 不允许使用缓存
conn.setrequestmethod("post");
conn.setrequestproperty("connection", "keep-alive");
conn.setrequestproperty("charsert", "utf-8");
conn.setrequestproperty("content-type", multipart_from_data + ";boundary=" + boundary);
// 首先组拼文本类型的参数
stringbuilder sb = new stringbuilder();
for (map.entry<string, string> entry : params.entryset()) {
sb.append(prefix);
sb.append(boundary);
sb.append(linend);
sb.append("content-disposition: form-data; name=\"" + entry.getkey() + "\"" + linend);
sb.append("content-type: text/plain; charset=" + charset + linend);
sb.append("content-transfer-encoding: 8bit" + linend);
sb.append(linend);
sb.append(entry.getvalue());
sb.append(linend);
}
dataoutputstream outstream = new dataoutputstream(conn.getoutputstream());
outstream.write(sb.tostring().getbytes());
// 发送文件数据
if (files != null)
for (map.entry<string, file> file : files.entryset()) {
stringbuilder sb1 = new stringbuilder();
sb1.append(prefix);
sb1.append(boundary);
sb1.append(linend);
sb1.append("content-disposition: form-data; name=\"uploadfile\"; filename=\""
+ file.getvalue().getname() + "\"" + linend);
sb1.append("content-type: application/octet-stream; charset=" + charset + linend);
sb1.append(linend);
outstream.write(sb1.tostring().getbytes());
inputstream is = new fileinputstream(file.getvalue());
byte[] buffer = new byte[1024];
int len = 0;
while ((len = is.read(buffer)) != -1) {
outstream.write(buffer, 0, len);
}
is.close();
outstream.write(linend.getbytes());
}
// 请求结束标志
byte[] end_data = (prefix + boundary + prefix + linend).getbytes();
outstream.write(end_data);
outstream.flush();
// 得到响应码
int res = conn.getresponsecode();
inputstream in = conn.getinputstream();
stringbuilder sb2 = new stringbuilder();
if (res == 200) {
int ch;
while ((ch = in.read()) != -1) {
sb2.append((char) ch);
}
}
outstream.close();
conn.disconnect();
return sb2.tostring();
}
}
示例调用第二种方式上传：
final map<string, string> params = new hashmap<string, string>();
params.put("send_userid", string.valueof(id));
params.put("send_email", address);
params.put("send_name", name);
params.put("receive_email", emails);
final map<string, file> files = new hashmap<string, file>();
files.put("uploadfile", file);
final string request = uploadutil.post(requesturl, params, files);
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