Android学习之使用HttpURLConnection同时上传文本和多个文件

原理是： 分析文件上传的数据格式，然后根据格式构造相应的发送给服务器的字符串。格式如下：这里的httppost123是我自己构造的字符串，可以是其他任何的字符串
----------httppost123 （\r\n）
Content-Disposition: form-data; name="img"; filename="t.txt" （\r\n）
Content-Type: application/octet-stream （\r\n）
（\r\n）
sdfsdfsdfsdfsdf （\r\n）
----------httppost123 （\r\n）
Content-Disposition: form-data; name="text" （\r\n）
（\r\n）
text tttt （\r\n）
----------httppost123-- （\r\n）
（\r\n）

       上面的（\r\n）表示各个数据必须以（\r\n）结尾。

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;

public class File_Text_UploadTest {

private static final String requestURL = "http://127.0.0.1:8080/BlogManager/blog/saveBlog_blogAction.action";

public static void main(String[] args) {
Map<String, String> params = new HashMap<String, String>();
params.put("title", "天气预报");
params.put("content", "今天有阵雪。。。");

Map<String, File> fileMap = new HashMap<String, File>();
fileMap.put("123.zip", new File("C:\\Users\\lzy\\Desktop\\CordovaDemo.zip"));
fileMap.put("audio.wav", new File("C:\\Users\\lzy\\Desktop\\audio.wav"));

try {
String code = post(requestURL, params, "attachment", fileMap);
System.out.println("----" + code);
} catch (IOException e) {
e.printStackTrace();
}
}

public static String post(String actionUrl, Map<String, String> params,
String fileReceiveKey,
Map<String, File> files) throws IOException {

final int MAX_BUFFER_SIZE = 16 * 1024;

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(actionUrl);
HttpURLConnection conn = (HttpURLConnection) uri.openConnection();
conn.setReadTimeout(5 * 1000);
conn.setDoInput(true);// 允许输入
conn.setDoOutput(true);// 允许输出
conn.setUseCaches(false);
conn.setRequestMethod("POST"); // Post方式
conn.setRequestProperty("connection", "keep-alive");
conn.setRequestProperty("Charsert", CHARSET);
conn.setRequestProperty("Content-Type", MULTIPART_FROM_DATA
+ ";boundary=" + BOUNDARY);

// 设置大文件分块上传
conn.setChunkedStreamingMode(MAX_BUFFER_SIZE);
// Although setChunkedStreamingMode sets this header, setting it explicitly here works
// around an OutOfMemoryException when using https.
conn.setRequestProperty("Transfer-Encoding", "chunked");

// 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=\"" + fileReceiveKey + "\"; filename=\""
+ file.getKey() + "\"" + 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();
InputStreamReader isReader = new InputStreamReader(in);
BufferedReader bufReader = new BufferedReader(isReader);
String line = null;
String data = "OK";

while ((line = bufReader.readLine()) == null)
data += line;

if (res == 200) {
int ch;
StringBuilder sb2 = new StringBuilder();
while ((ch = in.read()) != -1) {
sb2.append((char) ch);
}
}
outStream.close();
conn.disconnect();
return in.toString();
}
}