在android中通过http post方法传递数据，核心的包是：
java.net.HttpURLConnection
另外还有是http header的设置，以及post中参数的设置。
详细的可以参考下面的代码：
package com.rubenxiao.blog;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.Map;
/**
* Created by ruben on 18-9-18.
*/
public class HttpUtils {
public static String submitPostData(Map<String, String> params, String encode) throws MalformedURLException {
/**
* 发送POST请求到服务器并返回服务器信息
* @param params 请求体内容
* @param encode 编码格式
* @return 服务器返回信息
*/
byte[] data = getRequestData(params, encode).toString().getBytes();
URL url = new URL("http://172.16.1.226:5557/upload");
HttpURLConnection httpURLConnection = null;
try{
httpURLConnection = (HttpURLConnection)url.openConnection();
httpURLConnection.setConnectTimeout(3000); // 设置连接超时时间
httpURLConnection.setDoInput(true); // 打开输入流，以便从服务器获取数据
httpURLConnection.setDoOutput(true); // 打开输出流，以便向服务器提交数据
httpURLConnection.setRequestMethod("POST"); // 设置以POST方式提交数据
httpURLConnection.setUseCaches(false); // 使用POST方式不能使用缓存
// 设置请求体的类型是文本类型
httpURLConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
// 设置请求体的长度
httpURLConnection.setRequestProperty("Content-Length", String.valueOf(data.length));
// 获得输入流，向服务器写入数据
OutputStream outputStream = new BufferedOutputStream(httpURLConnection.getOutputStream());
outputStream.write(data);
outputStream.flush(); // 重要！flush()之后才会写入
int response = httpURLConnection.getResponseCode(); // 获得服务器响应码
if (response == HttpURLConnection.HTTP_OK) {
InputStream inputStream = httpURLConnection.getInputStream();
return dealResponseResult(inputStream); // 处理服务器响应结果
}
} catch (Exception e) {
e.printStackTrace();
} finally {
httpURLConnection.disconnect();
}
return "";
}
/**
* 封装请求体信息
* @param params 请求体内容
* @param encode 编码格式
* @return 请求体信息
*/
public static StringBuffer getRequestData(Map<String, String> params, String encode) {
StringBuffer stringBuffer = new StringBuffer(); //存储封装好的请求体信息
try {
for (Map.Entry<String, String> entry : params.entrySet()) {
stringBuffer.append(entry.getKey())
.append("=")
.append(URLEncoder.encode(entry.getValue(), encode))
.append("&");
}
stringBuffer.deleteCharAt(stringBuffer.length() - 1); // 删除最后一个"&"
} catch (Exception e) {
e.printStackTrace();
}
return stringBuffer;
}
/**
* 处理服务器的响应结果（将输入流转换成字符串)
* @param inputStream 服务器的响应输入流
* @return 服务器响应结果字符串
*/
public static String dealResponseResult(InputStream inputStream) {
String resultData = null;
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
byte[] data = new byte[1024];
int len = 0;
try {
while ((len = inputStream.read(data)) != -1) {
byteArrayOutputStream.write(data, 0, len);
}
} catch (Exception e) {
e.printStackTrace();
}
resultData = new String(byteArrayOutputStream.toByteArray());
return resultData;
}
}
使用方法：
String imgString = Base64.encodeToString(bytes, Base64.NO_WRAP);
Map<String, String> params = new HashMap<String, String>();
String post_result = null;
params.put("base64", imgString);
try {
post_result = HttpUtils.submitPostData(params, "utf-8");
Log.i("POST_RESULT", post_result);
} catch (MalformedURLException e) {
e.printStackTrace();
}