Question

我正在编写一个程序，通过检查来自新URL的响应代码来测试设置的重定向是否有效。我遇到了一个问题，中途通过运行我得到以下错误：

java.net.ProtocolException: Server redirected too many  times (20)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at java.net.HttpURLConnection.getResponseCode(Unknown Source)
at Test.testredirects.AppTest.test(AppTest.java:79)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

有没有办法忽略此错误或提高允许的重定向次数？

以下是我正在运行的代码的主要部分：

public void test() throws Exception {



        String fails[] = new String[1000];
        JFileChooser fileChooser = new JFileChooser();
        fileChooser.setCurrentDirectory(new File(System
                .getProperty("user.home")));
        int result = fileChooser.showOpenDialog(null);
        String file;
        File selectedFile = null;

        if (result == JFileChooser.APPROVE_OPTION) {
            selectedFile = fileChooser.getSelectedFile();
            System.out.println("Selected file: "
                    + selectedFile.getAbsolutePath());
        } else {
            JOptionPane.showMessageDialog(null, "Error",
                    "Please choose a file", JOptionPane.ERROR_MESSAGE);
        }

        file = selectedFile.getAbsolutePath();

        BufferedReader CSVFile = new BufferedReader(new FileReader(file));

        String dataRow = CSVFile.readLine();

        int i = 0;

        while (dataRow != null) {

            String[] dataArray = dataRow.split(",");
            for (String item : dataArray) {

                URL url = new URL(item);
                HttpURLConnection connection = (HttpURLConnection) url
                        .openConnection();
                connection.setRequestMethod("GET");
                connection.connect();
                i++;
                int code = connection.getResponseCode();

                System.out.print(item + " " + code + "\n");

                if (code != 200) {
                    fails[i] = code + " " + item + "\n";
                }
            }

            // driver.get(item); // Print the data line.
            dataRow = CSVFile.readLine();

        }

        int a = 0;

        CSVFile.close();

        File resultsFile = new File("c://results.txt");
        FileWriter fw = new FileWriter(resultsFile.getAbsoluteFile());
        BufferedWriter bw = new BufferedWriter(fw);

        do {
            bw.write(fails[a]);
            a++;
        } while (a <= fails.length);

        bw.close();



}

Answer 1

即使你使用了以下内容，这在Servlet中也会有所帮助：

response.redirect(URL);

或

requestDispatcher.forward(request,response)

后续代码仍将在这些调用之后继续，修复是在这些调用之后使用return;。

尝试获取响应代码时，服务器重定向次数过多（20）

1 个答案: