Go语言视频零基础入门到精通

时间旅人

java代码 public class TestGetPost

{

/**

* 向指定URL发送GET方法的请求

* @param url 发送请求的URL

* @param param 请求参数，请求参数应该是name1=value1&name2=value2的形式。

* @return URL所代表远程资源的响应

*/

public static String sendGet(String url , String param)

{

String result = "";

BufferedReader in = null;

try

{

String urlName = url + "?" + param;

URL realUrl = new URL(urlName);

//打开和URL之间的连接

URLConnection conn = realUrl.openConnection();

//设置通用的请求属性

conn.setRequestProperty("accept", "*/*");

conn.setRequestProperty("connection", "Keep-Alive");

conn.setRequestProperty("user-agent",

"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");

//建立实际的连接

conn.connect();

//获取所有响应头字段

Map<String, List<String>> map = conn.getHeaderFields();

//遍历所有的响应头字段

for (String key : map.keySet())

{

System.out.println(key + "--->" + map.get(key));

}

//定义BufferedReader输入流来读取URL的响应

in = new BufferedReader(

new InputStreamReader(conn.getInputStream()));

String line;

while ((line = in.readLine())!= null)

{

esult += "n" + line;

}

}

catch(Exception e)

{

System.out.println("发送GET请求出现异常！" + e);

e.printStackTrace();

}

//使用finally块来关闭输入流

finally

{

try

{

if (in != null)

{

in.close();

}

}

catch (IOException ex)

{

ex.printStackTrace();

}

}

return result;

}

/**

* 向指定URL发送POST方法的请求

* @param url 发送请求的URL

* @param param 请求参数，请求参数应该是name1=value1&name2=value2的形式。

* @return URL所代表远程资源的响应

*/

public static String sendPost(String url,String param)

{

PrintWriter out = null;

BufferedReader in = null;

String result = "";

try

{

URL realUrl = new URL(url);

//打开和URL之间的连接

URLConnection conn = realUrl.openConnection();

//设置通用的请求属性

conn.setRequestProperty("accept", "*/*");

conn.setRequestProperty("connection", "Keep-Alive");

conn.setRequestProperty("user-agent",

"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");

//发送POST请求必须设置如下两行

conn.setDoOutput(true);

conn.setDoInput(true);

// 获取URLConnection对象对应的输出流

out = new PrintWriter(conn.getOutputStream());

//发送请求参数

out.print(param);

//flush 输出流的缓冲

out.flush();

//定义BufferedReader输入流来读取URL的响应

in = new BufferedReader(

new InputStreamReader(conn.getInputStream()));

String line;

while ((line = in.readLine())!= null)

{

result += "n" + line;

}

}

catch(Exception e)

{

System.out.println("发送POST 请求出现异常！" + e);

e.printStackTrace();

}

//使用finally块来关闭输出流、输入流

finally

{

try

{

if (out != null)

{

out.close();

}

if (in != null)

{

in.close();

}

}

catch (IOException ex)

{

ex.printStackTrace();

}

}

return result;

}

//提供主方法，测试发送GET请求和POST请求

public static void main(String args[])

{

//发送GET请求

String s = TestGetPost.sendGet("http://localhost:8888/abc/

login.jsp",null);

System.out.println(s);

// 发送POST请求

String s1 = TestGetPost.sendPost("http://localhost:8888/abc/a.jsp",

"user= 李刚&pass=abc");

System.out.println(s1);

}

}   
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