目录：
1、post和get请求
2、使用HttpURLConnection请求multipart/form-data类型的form提交
1、post和get请求
public class HttpConnectionUtil {
public static HttpConnectionUtil http = new HttpConnectionUtil();
public static HttpConnectionUtil getHttp() {
return http;
}
public String getRequset(final String url) {
final StringBuilder sb = new StringBuilder();
FutureTask task = new FutureTask(new Callable() {
@Override
public String call() throws Exception {
HttpURLConnection connection = null;
BufferedReader reader = null;
try {
URL requestUrl = new URL(url);
connection = (HttpURLConnection) requestUrl.openConnection();
connection.setRequestMethod("GET");
connection.setConnectTimeout(8000);
connection.setReadTimeout(8000);
if (connection.getResponseCode() == 200) {
InputStream in = connection.getInputStream();
reader = new BufferedReader(new InputStreamReader(in));
String line;
while ((line = reader.readLine()) != null) {
sb.append(line);
}
System.out.println(sb);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (reader != null) {
reader.close();
}
if (connection != null) {
connection.disconnect();//断开连接，释放资源
}
}
return sb.toString();
}
});
new Thread(task).start();
String s = null;
try {
s = task.get();
} catch (Exception e) {
e.printStackTrace();
}
return s;
}
public String postRequset(final String url, final Map map) {
final StringBuilder sb = new StringBuilder();
FutureTask task = new FutureTask(new Callable() {
@Override
public String call() throws Exception {
HttpURLConnection connection = null;
BufferedReader reader = null;
try {
URL requestUrl = new URL(url);
connection = (HttpURLConnection) requestUrl.openConnection();
connection.setRequestMethod("POST");
connection.setConnectTimeout(8000);//链接超时
connection.setReadTimeout(8000);//读取超时
//发送post请求必须设置
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setUseCaches(false);
connection.setInstanceFollowRedirects(true);
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
DataOutputStream out = new DataOutputStream(connection
.getOutputStream());
StringBuilder request = new StringBuilder();
for (String key : map.keySet()) {
request.append(key + "=" + URLEncoder.encode(map.get(key), "UTF-8") + "&");
}
out.writeBytes(request.toString());//写入请求参数
out.flush();
out.close();
if (connection.getResponseCode() == 200) {
InputStream in = connection.getInputStream();
reader = new BufferedReader(new InputStreamReader(in));
String line;
while ((line = reader.readLine()) != null) {
sb.append(line);
}
System.out.println(sb);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (reader != null) {
reader.close();//关闭流
}
if (connection != null) {
connection.disconnect();//断开连接，释放资源
}
}
return sb.toString();
}
});
new Thread(task).start();
String s = null;
try {
s = task.get();
} catch (Exception e) {
e.printStackTrace();
}
return s;
}
}
2、multipart/form-data类型的form提交
/**
* Java原生的API可用于发送HTTP请求，即java.net.URL、java.net.URLConnection，这些API很好用、很常用，
* 但不够简便；
*
* 1.通过统一资源定位器（java.net.URL）获取连接器（java.net.URLConnection） 2.设置请求的参数 3.发送请求
* 4.以输入流的形式获取返回内容 5.关闭输入流
*
* @author H__D
*
*/
public class HttpConnectionFileUtils {
/**
* 多文件上传的方法
*
* @param actionUrl：上传的路径
* @param uploadFilePaths：需要上传的文件路径，数组
* @return
*/
@SuppressWarnings("finally")
public static String uploadFile(String actionUrl, String[] uploadFilePaths) {
String end = "\r\n";
String twoHyphens = "--";
String boundary = "abcdefghijk";
DataOutputStream ds = null;
InputStream inputStream = null;
InputStreamReader inputStreamReader = null;
BufferedReader reader = null;
StringBuffer resultBuffer = new StringBuffer();
String tempLine = null;
try {
// 统一资源
URL url = new URL(actionUrl);
// 连接类的父类，抽象类
URLConnection urlConnection = url.openConnection();
// http的连接类
HttpURLConnection httpURLConnection = (HttpURLConnection) urlConnection;
// 设置是否从httpUrlConnection读入，默认情况下是true;
httpURLConnection.setDoInput(true);
// 设置是否向httpUrlConnection输出
httpURLConnection.setDoOutput(true);
// Post 请求不能使用缓存
httpURLConnection.setUseCaches(false);
// 设定请求的方法，默认是GET
httpURLConnection.setRequestMethod("POST");
// 设置字符编码连接参数
httpURLConnection.setRequestProperty("Connection", "Keep-Alive");
// 设置字符编码
httpURLConnection.setRequestProperty("Charset", "UTF-8");
// 设置请求内容类型
httpURLConnection.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
// 设置DataOutputStream
ds = new DataOutputStream(httpURLConnection.getOutputStream());
ds.writeBytes(twoHyphens + boundary + end);
ds.writeBytes("Content-Disposition: form-data; name=\"accessToken\"");
ds.writeBytes(end);
ds.writeBytes("Content-Length:8");
ds.writeBytes(end);
ds.writeBytes(end);
ds.writeBytes("dengdeng");
ds.writeBytes(end);
StringBuilder sb = new StringBuilder();
for (int i = 0; i < uploadFilePaths.length; i++) {
String uploadFile = uploadFilePaths[i];
String filename = uploadFile.substring(uploadFile.lastIndexOf("//") + 1);
ds.writeBytes(twoHyphens + boundary + end);
ds.writeBytes("Content-Disposition: form-data; " + "name=\"file" + i + "\";filename=\"" + filename + "\"" + end);
ds.writeBytes(end);
FileInputStream fStream = new FileInputStream(uploadFile);
int bufferSize = 1024;
byte[] buffer = new byte[bufferSize];
int length = -1;
while ((length = fStream.read(buffer)) != -1) {
ds.write(buffer, 0, length);
}
ds.writeBytes(end);
/* close streams */
fStream.close();
}
ds.writeBytes(twoHyphens + boundary+twoHyphens + end);
/* close streams */
ds.flush();
Log.e("----------",twoHyphens + boundary + end);
if (httpURLConnection.getResponseCode() >= 300) {
throw new Exception(
"HTTP Request is not success, Response code is " + httpURLConnection.getResponseCode()+",message:"+httpURLConnection.getResponseMessage());
}
// Log.e("response code",httpURLConnection.getResponseMessage()+"---"+httpURLConnection.getResponseCode());
if (httpURLConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {
inputStream = httpURLConnection.getInputStream();
inputStreamReader = new InputStreamReader(inputStream);
reader = new BufferedReader(inputStreamReader);
tempLine = null;
resultBuffer = new StringBuffer();
while ((tempLine = reader.readLine()) != null) {
resultBuffer.append(tempLine);
resultBuffer.append("\n");
}
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if (ds != null) {
try {
ds.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (inputStreamReader != null) {
try {
inputStreamReader.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (inputStream != null) {
try {
inputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return resultBuffer.toString();
}
}
}
更多参阅
- 使用HttpURLConnection请求multipart/form-data类型的form提交
- https://www.w3.org/TR/html401/interact/forms.html#h-17.13.4.2
- http://www.blogjava.net/supercrsky/articles/247449.html