Java 純HTTP Get請求獲取響應內容，如果發生302重定向，繼而模擬請求域獲取重定向后的響應內容。

關鍵點：設置conn.setInstanceFollowRedirects為false即可

示例代碼

public static void main(String[] args) {

try {

StringBuffer buffer = new StringBuffer();

String url = "http://localhost:8080/istock/login?u=name&p=pass";

System.out.println("訪問地址:" + url);

//發送get請求

URL serverUrl = new URL(url);

HttpURLConnection conn = (HttpURLConnection) serverUrl.openConnection();

conn.setRequestMethod("GET");

//必須設置false，否則會自動redirect到重定向后的地址

conn.setInstanceFollowRedirects(false);

conn.addRequestProperty("Accept-Charset", "UTF-8;");

conn.addRequestProperty("User-Agent", "Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.2.8) Firefox/3.6.8");

conn.addRequestProperty("Referer", "http://matols.com/");

conn.connect();

//判定是否會進行302重定向

if (conn.getResponseCode() == 302) {

//如果會重定向，保存302重定向地址，以及Cookies,然后重新發送請求(模擬請求)

String location = conn.getHeaderField("Location");

String cookies = conn.getHeaderField("Set-Cookie");

serverUrl = new URL(location);

conn = (HttpURLConnection) serverUrl.openConnection();

conn.setRequestMethod("GET");

conn.setRequestProperty("Cookie", cookies);

conn.addRequestProperty("Accept-Charset", "UTF-8;");

conn.addRequestProperty("User-Agent","Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.2.8) Firefox/3.6.8");

conn.addRequestProperty("Referer", "http://matols.com/");

conn.connect();

System.out.println("跳轉地址:" + location);

}

//將返回的輸入流轉換成字符串

InputStream inputStream = conn.getInputStream();

InputStreamReader inputStreamReader = new InputStreamReader(inputStream,"utf-8");

BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

String str = null;

while ((str = bufferedReader.readLine()) != null) {

buffer.append(str);

}

bufferedReader.close();

inputStreamReader.close();

// 釋放資源

inputStream.close();

inputStream = null;

System.out.println(buffer.toString());

} catch (Exception e) {

e.printStackTrace();

}

}

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