public class TestGetPost {
/**
* 向指定URL發送GET方法的請求
* @param url 發送請求的URL
* @param param 請求參數,請求參數應該是name1=value1&name2=value2的形式。
* @return URL所代表遠程資源的響應
*/
public static String sendGet(String url, String param) {
String result = "";
BufferedReader in = null;
try {
String urlName = url + "?" + param;
URL realUrl = new URL(urlName);
//打開和URL之間的連接
URLConnection conn = realUrl.openConnection();
//設置通用的請求屬性
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("user-agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");
//建立實際的連接
conn.connect();
//獲取所有響應頭字段
Map < String, List < String >> map = conn.getHeaderFields();
//遍歷所有的響應頭字段
for (String key: map.keySet()) {
System.out.println(key + "--->" + map.get(key));
}
//定義BufferedReader輸入流來讀取URL的響應
in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String line;
while ((line = in .readLine()) != null) {
result += "/n" + line;
}
} catch (Exception e) {
System.out.println("發送GET請求出現異常!" + e);
e.printStackTrace();
}
//使用finally塊來關閉輸入流
finally {
try {
if ( in != null) { in .close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
return result;
}
/**
* 向指定URL發送POST方法的請求
* @param url 發送請求的URL
* @param param 請求參數,請求參數應該是name1=value1&name2=value2的形式。
* @return URL所代表遠程資源的響應
*/
public static String sendPost(String url, String param) {
PrintWriter out = null;
BufferedReader in = null;
String result = "";
try {
URL realUrl = new URL(url);
//打開和URL之間的連接
URLConnection conn = realUrl.openConnection();
//設置通用的請求屬性
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("user-agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");
//發送POST請求必須設置如下兩行
conn.setDoOutput(true);
conn.setDoInput(true);
//獲取URLConnection對象對應的輸出流
out = new PrintWriter(conn.getOutputStream());
//發送請求參數
out.print(param);
//flush輸出流的緩衝
out.flush();
//定義BufferedReader輸入流來讀取URL的響應
in = new BufferedReader(
new InputStreamReader(conn.getInputStream()));
String line;
while ((line = in .readLine()) != null) {
result += "/n" + line;
}
} catch (Exception e) {
System.out.println("發送POST請求出現異常!" + e);
e.printStackTrace();
}
//使用finally塊來關閉輸出流、輸入流
finally {
try {
if (out != null) {
out.close();
}
if ( in != null) { in .close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
return result;
}
//提供主方法,測試發送GET請求和POST請求
public static void main(String args[]) {
//發送GET請求
String s = TestGetPost.sendGet("http://localhost:8888/abc/login.jsp", null);
System.out.println(s);
//發送POST請求
String s1 = TestGetPost.sendPost(http: //localhost:8888/abc/a.jsp ,
"user=李剛&pass=abc");
System.out.println(s1);
}
}
JAVA通過HTTP訪問:Post+Get方式
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