1. 服务端
doPost(){
doGet(request,response);
}
2. Post方式不在URL后面加数据，而是用流的方式传递；GET在URL后传输数据
3. 是否传递—请求头：setRequestProperty();
MainActivity中：
-
public
void
doPost(View v) {
-
final
String userName = etUserName.getText().toString();
-
final
String password = etPassword.getText().toString();
-
-
new
Thread(
new
Runnable() {
-
@Override
-
public
void
run() {
-
final
String state = NetUtils.loginOfPost(userName, password);
-
// 执行任务在主线程中
-
runOnUiThread(
new
Runnable() {
-
@Override
-
public
void
run() {
-
// 就是在主线程中操作
-
Toast.makeText(MainActivity.
this
, state,
0
).show();
-
}
-
});
-
}
-
}).start();
-
}
loginOfPost方法：
-
/**
-
* 使用post的方式登录
-
* @param userName
-
* @param password
-
* @return
-
*/
-
public
static
String loginOfPost(String userName, String password) {
-
HttpURLConnection conn =
null
;
-
try
{
-
URL url =
new
URL(
“http://10.0.2.2:8080/ServerItheima28/servlet/LoginServlet”
);
-
-
conn = (HttpURLConnection) url.openConnection();
-
-
conn.setRequestMethod(
“POST”
);
-
conn.setConnectTimeout(
10000
);
// 连接的超时时间
-
conn.setReadTimeout(
5000
);
// 读数据的超时时间
-
conn.setDoOutput(
true
);
// 必须设置此方法, 允许输出****** 默认情况下, 系统不允许向服务器输出内容
-
/ conn.setRequestProperty(
“Content-Length”
,
234
);
// 设置请求头消息, 可以设置多个
-
-
// post请求的参数
-
String data =
“username=”
+ userName +
“&password=”
+ password;
-
-
// 获得一个输出流, 用于向服务器写数据, 默认情况下, 系统不允许向服务器输出内容
-
OutputStream out = conn.getOutputStream();
-
out.write(data.getBytes());
-
out.flush();
-
out.close();
-
-
int
responseCode = conn.getResponseCode();
-
if
(responseCode ==
200
) {
-
InputStream is = conn.getInputStream();
-
String state = getStringFromInputStream(is);
-
return
state;
-
}
else
{
-
Log.i(TAG,
“访问失败: ”
+ responseCode);
-
}
-
}
catch
(Exception e) {
-
e.printStackTrace();
-
}
finally
{
-
if
(conn !=
null
) {
-
conn.disconnect();
-
}
-
}
-
return
null
;
-
}
根据流返回一个字符串信息；
-
/**
-
* 根据流返回一个字符串信息
-
* @param is
-
* @return
-
* @throws IOException
-
*/
-
private
static
String getStringFromInputStream(InputStream is)
throws
IOException {
-
ByteArrayOutputStream baos =
new
ByteArrayOutputStream();
-
byte
[] buffer =
new
byte
[
1024
];
-
int
len = –
1
;
-
-
while
((len = is.read(buffer)) != –
1
) {
-
baos.write(buffer,
0
, len);
-
}
-
is.close();
-
-
String html = baos.toString();
// 把流中的数据转换成字符串, 采用的编码是: utf-8
-
-
// String html = new String(baos.toByteArray(), “GBK”);
-
-
baos.close();
-
return
html;
-
}