tomcat配置后，可以通过浏览器访问，但是java得HttpURLConnection访问总是失败。

2015-09-11 02:37:23 1.6k 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

宽容老好人 vs 严格完美主义者：HttpURLConnection 迁 HttpClient 的 4 个隐藏陷阱 4 个 HttpClient 迁移坑让本地编译通过的项目在生产环境连栽：Duration.ZERO 抛异常、5 个受限请求头不让设、302 不自动跟随、两端漏改。HttpURLConnection 是"宽容老好人"，HttpClient 是"严格完美主义者"——陷阱在默认值而非 API。阅读详情

如题。

代码如下：



        String path = "http://localhost:8080/aaa.xml";

//        String path = "http://www.baidu.com";

        URL url = new URL(path);

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

        conn.setDoInput(true);

        conn.setConnectTimeout(5000);

        conn.setRequestMethod("GET");

//        InputStream in = conn.getInputStream();  // error

conn.getInputStream()就会出错。
出错信息如下：



java.net.ConnectException: failed to connect to localhost/127.0.0.1 (port 8080) after 5000ms: isConnected failed: ECONNREFUSED (Connection refused)

at libcore.io.IoBridge.isConnected(IoBridge.java:223)

at libcore.io.IoBridge.connectErrno(IoBridge.java:161)

at libcore.io.IoBridge.connect(IoBridge.java:112)

at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)

at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)

at java.net.Socket.connect(Socket.java:843)

at com.android.okhttp.internal.Platform.connectSocket(Platform.java:152)

at com.android.okhttp.Connection.connect(Connection.java:101)

at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:294)

at com.android.okhttp.internal.http.HttpEngine.sendSocketRequest(HttpEngine.java:255)

at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:206)

at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:345)

at com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:296)

at com.android.okhttp.internal.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:179)

......