// http://blog.csdn.net/woxueliuyun/article/details/43267365

package tool

class MyHttpUrlConn {

public static String cookieVal=""

public static void Get(String url_get,String str_param_url,String charset,String cookie) throws IOException {

// 拼湊get請(qǐng)求的URL字串，使用URLEncoder.encode對(duì)特殊和不可見(jiàn)字符進(jìn)行編碼

// String getURL = GET_URL + "?username=" + URLEncoder.encode("fat man", "utf-8");

String getURL = url_get + "?" + str_param_url

URL getUrl = new URL(getURL);

// 根據(jù)拼湊的URL，打開連接，URL.openConnection函數(shù)會(huì)根據(jù)URL的類型，

// 返回不同的URLConnection子類的對(duì)象，這里URL是一個(gè)http，因此實(shí)際返回的是HttpURLConnection

HttpURLConnection connection = (HttpURLConnection) getUrl

.openConnection();

if (cookie != null) {

//發(fā)送cookie信息上去，以表明自己的身份，否則會(huì)被認(rèn)為沒(méi)有權(quán)限

println("set cookieVal = [" + cookie + "]")

connection.setRequestProperty("Cookie", cookie);

}

// 進(jìn)行連接，但是實(shí)際上get request要在下一句的connection.getInputStream()函數(shù)中才會(huì)真正發(fā)到

// 服務(wù)器

connection.connect();

// 取得輸入流，并使用Reader讀取

BufferedReader reader = new BufferedReader(new InputStreamReader(

connection.getInputStream(),charset));

System.out.println("Contents of get request:");

String lines;

while ((lines = reader.readLine()) != null) {

System.out.println(lines);

}

println(" ")

reader.close();

// 斷開連接

connection.disconnect();

}

public static String Post(String url_post,String str_param_body,String charset,boolean b_flag,String cookies) throws IOException {

// Post請(qǐng)求的url，與get不同的是不需要帶參數(shù)

URL postUrl = new URL(url_post);

// 打開連接

HttpURLConnection connection = (HttpURLConnection) postUrl

.openConnection();

// Output to the connection. Default is

// false, set to true because post

// method must write something to the

// connection

// 設(shè)置是否向connection輸出，因?yàn)檫@個(gè)是post請(qǐng)求，參數(shù)要放在

// http正文內(nèi)，因此需要設(shè)為true

if("" != cookies){

connection.setRequestProperty("Cookie", cookies);

}

connection.setDoOutput(true);

// Read from the connection. Default is true.

connection.setDoInput(true);

// Set the post method. Default is GET

connection.setRequestMethod("POST");

// Post cannot use caches

// Post 請(qǐng)求不能使用緩存

connection.setUseCaches(false);

// This method takes effects to

// every instances of this class.

// URLConnection.setFollowRedirects是static函數(shù)，作用于所有的URLConnection對(duì)象。

// connection.setFollowRedirects(true);

// This methods only

// takes effacts to this

// instance.

// URLConnection.setInstanceFollowRedirects是成員函數(shù)，僅作用于當(dāng)前函數(shù)

connection.setInstanceFollowRedirects(b_flag);

// Set the content type to urlencoded,

// because we will write

// some URL-encoded content to the

// connection. Settings above must be set before connect!

// 配置本次連接的Content-type，配置為application/x-www-form-urlencoded的

// 意思是正文是urlencoded編碼過(guò)的form參數(shù)，下面我們可以看到我們對(duì)正文內(nèi)容使用URLEncoder.encode

// 進(jìn)行編碼

connection.setRequestProperty("Content-Type",

"application/x-www-form-urlencoded");

// 連接，從postUrl.openConnection()至此的配置必須要在connect之前完成，

// 要注意的是connection.getOutputStream會(huì)隱含的進(jìn)行connect。

connection.connect();

DataOutputStream out = new DataOutputStream(connection

.getOutputStream());

// The URL-encoded contend

// 正文，正文內(nèi)容其實(shí)跟get的URL中'?'后的參數(shù)字符串一致

// String content = "userName=" + URLEncoder.encode("console", "utf-8");

// content = content + "&password=" + URLEncoder.encode("12345678", "utf-8");

println("http param body = [" + str_param_body + "]")

// DataOutputStream.writeBytes將字符串中的16位的unicode字符以8位的字符形式寫道流里面

out.writeBytes(str_param_body);

out.flush();

// 取得cookie，相當(dāng)于記錄了身份，供下次訪問(wèn)時(shí)使用

// cookieVal = connection.getHeaderField("Set-Cookie").split(";")[0]

cookieVal = connection.getHeaderField("Set-Cookie")

println("get cookieVal = [" + cookieVal + "]")

out.close(); // flush and close

BufferedReader reader = new BufferedReader(new InputStreamReader(

connection.getInputStream(),charset));

String line;

System.out.println("Contents of post request:");

while ((line = reader.readLine()) != null) {

System.out.println(line);

}

println(" ")

reader.close();

connection.disconnect();

return cookieVal

}

}

用法：

String cookie_login = MyHttpUrlConn.Post(URL_LOGIN,"userName=admin&password=12345678","utf-8",false,"");

MyHttpUrlConn.Post(URL_POST_SAVE,"name=mxb&yearsold=6","utf-8",false,cookie_login);

MyHttpUrlConn.Get(URL_GET_VIEW,"name=mxb&yearsold=6","utf-8",cookie_login);

說(shuō)明：

向URL_POST_SAVE Post數(shù)據(jù)時(shí)，要帶上URL_LOGIN時(shí)生成的cookie，否則無(wú)法save數(shù)據(jù)。

同理Get也是。

總結(jié)

以上是生活随笔為你收集整理的java 登录牵手_Java: HttpURLConnection 模拟登录方法 (带cookie 的Post/Get)_20160908_七侠镇莫尛貝...的全部?jī)?nèi)容，希望文章能夠幫你解決所遇到的問(wèn)題。

如果覺(jué)得生活随笔網(wǎng)站內(nèi)容還不錯(cuò)，歡迎將生活随笔推薦給好友。