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java-Jsoup网站登录抛出未知异常

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I attempt to login to my school’s grade book website to display the HTML with the following code:

public class Connect {



public static void main(String[] args) {

    String pageURL = "https://parents.mtsd.k12.nj.us/genesis/parents?tab1=studentdata&action=form";
    String param1 = "&tab2=gradebook";
    String param2 = "&tab3=weeklysummary";
    String param3 = "&studentid=";
    Scanner input = new Scanner (System.in);
    String initURL = "https://parents.mtsd.k12.nj.us/genesis/parents?gohome=true";




    //System.out.print("Enter Student ID: ");
    //String sID = input.nextLine();
    String sID = "not shown";

    String URLF = pageURL + param1 + param2 + param3 + sID;

    connectTo(URLF);


    // write your code here
}

public static Document connectTo (String URLF){

    String loginURL = "https://parents.mtsd.k12.nj.us/genesis/parents/j_security_check";
    String userDataUrl = URLF;
    String username = "not shown";
    String password = "not shown";

    Connection.Response res = null;
    Document doc = null;

    try {

        res = Jsoup.connect(userDataUrl)
                .userAgent("Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.4 Safari/537.36")
                .header("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8")
                .timeout(500)
                .method(Connection.Method.GET)
                .execute();

    } catch (IOException io) {

        io.printStackTrace();

    }

    try {

        doc = Jsoup.connect(loginURL)
                .userAgent("Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.4 Safari/537.36")
                .referrer("https://parents.mtsd.k12.nj.us/genesis/parents?gohome=true")
                .cookies(res.cookies())
                .data("j_username", username)
                .data("j_password", password)
                .post();


    } catch (IOException ioe) {

        ioe.printStackTrace();

    }

    if (doc != null){
        System.out.print(doc.text());
    }
    return null;
}
}

However, when I run this, I get the following error:

javax.net.ssl.SSLHandshakeException:  sun.security.validator.ValidatorException: PKIX path building failed:  sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at sun.security.ssl.Alerts.getSSLException(Alerts.java:192)
at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1949)
at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:302)
at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:296)
at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1506)
at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:216)
at sun.security.ssl.Handshaker.processLoop(Handshaker.java:979)
at sun.security.ssl.Handshaker.process_record(Handshaker.java:914)
at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1062)
at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1375)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1403)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1387)
at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:559)
at  sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDele gateHttpsURLConnection.java:185)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:153)
at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:512)
at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:493)
at org.jsoup.helper.HttpConnection.execute(HttpConnection.java:205)
at com.gs.Connect.connectTo(Connect.java:58)
at com.gs.Connect.main(Connect.java:35)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at sun.security.provider.certpath.SunCertPathBuilder.build(SunCertPathBuilder.java:146)
at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:131)
at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:280)
at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:382)
... 26 more
Exception in thread "main" java.lang.NullPointerException
at com.gs.Connect.connectTo(Connect.java:71)
at com.gs.Connect.main(Connect.java:35)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)

Now, I am not sure why this is not working as I have been using this similar process (with Jsoup) to login/parse information from similar websites and I haven’t run into any issues. Any help is appreciated!

解决方法:

关于执行源无法找到到请求目标的有效证书路径的简短说明.

Java仅在信任证书的情况下才会通过SSL建立安全连接.信任的证书存储在信任库${JAVA_HOME} / lib / security / cacerts中.受托机构包含众所周知的证书颁发机构(CA)的列表.如果远程服务器的证书既不是由受托机构中的CA之一签名的,也不是远程服务器本身的证书位于受托机构中,则将不会信任该连接,并且会抛出SunCertPathBuilderException.

在这种情况下,该证书由GoDaddy.com签名,该证书不在Java trustore中.因此,必须在默认的Java trustore或单独的your_keystore.jks中手动添加服务器证书.

以下步骤说明了如何下载服务器证书并将其存储在separat密钥库中.然后,此密钥库将用于验证服务器证书.

默认情况下,不要对所有Java不信任连接执行此操作.在执行此操作之前,必须确保要连接的服务器是要连接的服务器.

首先,您需要下载该网页的证书.

例如.使用Chrome浏览器(针对Linux,Windows所述的步骤类似,OSX请检查以下注释)：

>打开网页https://parents.mtsd.k12.nj.us
>单击地址栏中的锁定图标(在https：//之前)
>在对话框中,单击连接选项卡
>单击链接证书信息
>在证书查看器中,单击选项卡详细信息
>单击按钮导出,并将证书以BASE 64编码的单个证书格式保存为owa.mtsd.us.b64文件(可以是任何其他文件名)


接下来创建密钥库文件(一个命令行)

keytool -import -noprompt -trustcacerts \
    -alias owa.mtsd.us -file owa.mtsd.us.b64 \
    -keystore your_keystore.jks -storepass YourPasswd

以下代码段成功建立了连接

// without setting your created keystore
// a sun.security.validator.ValidatorException will be thrown
System.setProperty("javax.net.ssl.trustStore", "your_keystore.jks");
String url = "https://parents.mtsd.k12.nj.us";
Document doc = Jsoup.connect(url).get();
System.out.println("doc = " + doc.text());

输出

doc = One Moment...

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