fix redirect bug

CHANGELOG.md

@@ -7,6 +7,7 @@
 
 ### 🐣新特性
 ### 🐞Bug修复
+* 【http   】     HttpUtil重定向次数失效问题（issue#I4O28Q@Gitee）
 
 -------------------------------------------------------------------------------------------------------------
 # 5.7.18 (2021-12-25)

hutool-http/src/main/java/cn/hutool/http/HttpGlobalConfig.java

@@ -20,9 +20,10 @@ import java.net.HttpURLConnection;
 public class HttpGlobalConfig implements Serializable {
 	private static final long serialVersionUID = 1L;
 
-	protected static int timeout = -1;
+	private static int timeout = -1;
 	private static boolean isAllowPatch = false;
 	private static String boundary = "--------------------Hutool_" + RandomUtil.randomString(16);
+	private static int maxRedirectCount = 0;
 
 	/**
 	 * 获取全局默认的超时时长
@@ -62,6 +63,28 @@ public class HttpGlobalConfig implements Serializable {
 		boundary = customBoundary;
 	}
 
+	/**
+	 * 获取全局默认的最大重定向次数，如设置0表示不重定向<br>
+	 * 如果设置为1，表示重定向一次，即请求两次
+	 *
+	 * @return 全局默认的最大重定向次数
+	 * @since 5.7.19
+	 */
+	public static int getMaxRedirectCount() {
+		return maxRedirectCount;
+	}
+
+	/**
+	 * 设置默认全局默认的最大重定向次数，如设置0表示不重定向<br>
+	 * 如果设置为1，表示重定向一次，即请求两次
+	 *
+	 * @param customMaxRedirectCount 全局默认的最大重定向次数
+	 * @since 5.7.19
+	 */
+	synchronized public static void setMaxRedirectCount(int customMaxRedirectCount) {
+		maxRedirectCount = customMaxRedirectCount;
+	}
+
 	/**
 	 * 获取Cookie管理器，用于自定义Cookie管理
 	 *
@@ -80,7 +103,7 @@ public class HttpGlobalConfig implements Serializable {
 	 * @since 4.5.14
 	 * @see GlobalCookieManager#setCookieManager(CookieManager)
 	 */
-	public static void setCookieManager(CookieManager customCookieManager) {
+	synchronized public static void setCookieManager(CookieManager customCookieManager) {
 		GlobalCookieManager.setCookieManager(customCookieManager);
 	}
 
@@ -90,7 +113,7 @@ public class HttpGlobalConfig implements Serializable {
 	 * @since 4.1.9
 	 * @see GlobalCookieManager#setCookieManager(CookieManager)
 	 */
-	public static void closeCookie() {
+	synchronized public static void closeCookie() {
 		GlobalCookieManager.setCookieManager(null);
 	}
 

hutool-http/src/main/java/cn/hutool/http/HttpRequest.java

@@ -206,11 +206,11 @@ public class HttpRequest extends HttpBase<HttpRequest> {
 	/**
 	 * 默认连接超时
 	 */
-	private int connectionTimeout = HttpGlobalConfig.timeout;
+	private int connectionTimeout = HttpGlobalConfig.getTimeout();
 	/**
 	 * 默认读取超时
 	 */
-	private int readTimeout = HttpGlobalConfig.timeout;
+	private int readTimeout = HttpGlobalConfig.getTimeout();
 	/**
 	 * 存储表单数据
 	 */
@@ -243,7 +243,7 @@ public class HttpRequest extends HttpBase<HttpRequest> {
 	/**
 	 * 最大重定向次数
 	 */
-	private int maxRedirectCount;
+	private int maxRedirectCount = HttpGlobalConfig.getMaxRedirectCount();
 	/**
 	 * Chuncked块大小，0或小于0表示不设置Chuncked模式
 	 */
@@ -1131,8 +1131,8 @@ public class HttpRequest extends HttpBase<HttpRequest> {
 				.setReadTimeout(this.readTimeout)//
 				.setMethod(this.method)//
 				.setHttpsInfo(this.hostnameVerifier, this.ssf)//
-				// 定义转发
+				// 关闭JDK自动转发，采用手动转发方式
-				.setInstanceFollowRedirects(this.maxRedirectCount > 0)
+				.setInstanceFollowRedirects(false)
 				// 流方式上传数据
 				.setChunkedStreamingMode(this.blockSize)
 				// 覆盖默认Header
@@ -1174,13 +1174,8 @@ public class HttpRequest extends HttpBase<HttpRequest> {
 	 * @return {@link HttpResponse}，无转发返回 {@code null}
 	 */
 	private HttpResponse sendRedirectIfPossible(boolean isAsync) {
-		if (this.maxRedirectCount < 1) {
-			// 不重定向
-			return null;
-		}
-
 		// 手动实现重定向
-		if (this.httpConnection.getHttpURLConnection().getInstanceFollowRedirects()) {
+		if (this.maxRedirectCount > 0) {
 			int responseCode;
 			try {
 				responseCode = httpConnection.responseCode();
@@ -1195,6 +1190,7 @@ public class HttpRequest extends HttpBase<HttpRequest> {
 					setUrl(httpConnection.header(Header.LOCATION));
 					if (redirectCount < this.maxRedirectCount) {
 						redirectCount++;
+						// 重定向不再走过滤器
 						return doExecute(isAsync, null);
 					}
 				}

hutool-http/src/main/java/cn/hutool/http/HttpUtil.java

@@ -130,7 +130,7 @@ public class HttpUtil {
 	 * @return 返回内容，如果只检查状态码，正常只返回 ""，不正常返回 null
 	 */
 	public static String get(String urlString) {
-		return get(urlString, HttpGlobalConfig.timeout);
+		return get(urlString, HttpGlobalConfig.getTimeout());
 	}
 
 	/**
@@ -177,7 +177,7 @@ public class HttpUtil {
 	 * @return 返回数据
 	 */
 	public static String post(String urlString, Map<String, Object> paramMap) {
-		return post(urlString, paramMap, HttpGlobalConfig.timeout);
+		return post(urlString, paramMap, HttpGlobalConfig.getTimeout());
 	}
 
 	/**
@@ -207,7 +207,7 @@ public class HttpUtil {
 	 * @return 返回数据
 	 */
 	public static String post(String urlString, String body) {
-		return post(urlString, body, HttpGlobalConfig.timeout);
+		return post(urlString, body, HttpGlobalConfig.getTimeout());
 	}
 
 	/**

hutool-http/src/test/java/cn/hutool/http/HttpRequestTest.java

@@ -149,4 +149,23 @@ public class HttpRequestTest {
 		Console.log(execute.body());
 	}
 
+	@Test
+	@Ignore
+	public void followRedirectsTest(){
+		// 从5.7.19开始关闭JDK的自动重定向功能，改为手动重定向
+		// 当有多层重定向时，JDK的重定向会失效，或者说只有最后一个重定向有效，因此改为手动更易控制次数
+		// 此链接有两次重定向，当设置次数为1时，表示最多执行一次重定向，即请求2次
+		String url = "http://api.rosysun.cn/sjtx/?type=2";
+//		String url = "https://api.btstu.cn/sjtx/api.php?lx=b1";
+
+		// 方式1：全局设置
+		HttpGlobalConfig.setMaxRedirectCount(1);
+		HttpResponse execute = HttpRequest.get(url).execute();
+		Console.log(execute.getStatus(), execute.header(Header.LOCATION));
+
+		// 方式2，单独设置
+		execute = HttpRequest.get(url).setMaxRedirectCount(1).execute();
+		Console.log(execute.getStatus(), execute.header(Header.LOCATION));
+	}
+
 }