> Task :compileTestJava FAILED /home/ubuntu/iot_ece448/src/test/java/ece448/iot_sim/HTTPCommandsTests.java:16: error: unreported exception Exception; must be caught or declared to be thrown String ret = get("/xxxx"); ^

这个错误是由于你在调用 `get("/xxxx")` 方法时，该方法可能会抛出 `Exception` 异常，但是你没有在代码中处理这个异常。你需要使用 `try-catch` 块来处理这个异常，或者在方法的声明中使用 `throws Exception` 来声明该方法可能会抛出 `Exception` 异常。例如： ``` try { String ret = get("/xxxx"); // 处理返回值 } catch (Exception e) { // 处理异常 } ``` 或者在方法的声明中声明可能会抛出 `Exception` 异常： ``` public void someMethod() throws Exception { String ret = get("/xxxx"); // 处理返回值 } ``` 请注意，这只是一个示例，具体的处理方式取决于你的业务逻辑和代码结构。

package ece448.iot_sim; import java.util.List; import java.util.Map; import java.util.TreeMap; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import ece448.iot_sim.http_server.RequestHandler; public class HTTPCommands implements RequestHandler { // Use a map so we can search plugs by name. private final TreeMap<String, PlugSim> plugs = new TreeMap<>(); public HTTPCommands(List<PlugSim> plugs) { for (PlugSim plug: plugs) { this.plugs.put(plug.getName(), plug); } } @Override public String handleGet(String path, Map<String, String> params) { // list all: / // do switch: /plugName?action=on|off|toggle // just report: /plugName logger.info("HTTPCmd {}: {}", path, params); if (path.equals("/")) { return listPlugs(); } PlugSim plug = plugs.get(path.substring(1)); if (plug == null) return null; // no such plug String action = params.get("action"); if (action == null) return report(plug); // P2: add your code here, modify the next line if necessary if("toggle".equals(action)){ plug.toggle(); return report(plug); }else if("on".equals(action)){ plug.switchOn(); return report(plug); }else if("off".equals(action)){ plug.switchOff(); return report(plug); } return "<html><body></body></html>"; } protected String listPlugs() { StringBuilder sb = new StringBuilder(); sb.append("<html><body>"); for (String plugName: plugs.keySet()) { sb.append(String.format("<a href='/%s'>%s</a>", plugName, plugName)); } sb.append("</body></html>"); return sb.toString(); } protected String report(PlugSim plug) { String name = plug.getName(); return String.format("<html><body>" +"Plug %s is %s." +"Power reading is %.3f." +"<a href='/%s?action=on'>Switch On</a>" +"<a href='/%s?action=off'>Switch Off</a>" +"<a href='/%s?action=toggle'>Toggle</a>" +"</body></html>", name, plug.isOn()? "on": "off", plug.getPower(), name, name, name); }如何对上述代码全部功能进行测试呢？请提供测试代码。

以下是一个简单的测试代码，可以测试HTTPCommands类中的所有功能： ``` import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; public class HTTPCommandsTest { public static void main(String[] args) { // Create some plug simulations List<PlugSim> plugs = new ArrayList<>(); plugs.add(new PlugSim("Plug1")); plugs.add(new PlugSim("Plug2")); plugs.add(new PlugSim("Plug3")); // Create an HTTPCommands object and test its methods HTTPCommands commands = new HTTPCommands(plugs); testListPlugs(commands); testReport(commands); testHandleGet(commands); } private static void testListPlugs(HTTPCommands commands) { String expected = "<html><body><a href='/Plug1'>Plug1</a><a href='/Plug2'>Plug2</a><a href='/Plug3'>Plug3</a></body></html>"; String actual = commands.listPlugs(); assert expected.equals(actual) : "testListPlugs failed: expected " + expected + ", but got " + actual; } private static void testReport(HTTPCommands commands) { PlugSim plug = new PlugSim("TestPlug"); plug.switchOn(); plug.setPower(123.456); String expected = "<html><body>Plug TestPlug is on.Power reading is 123.456.<a href='/TestPlug?action=on'>Switch On</a><a href='/TestPlug?action=off'>Switch Off</a><a href='/TestPlug?action=toggle'>Toggle</a></body></html>"; String actual = commands.report(plug); assert expected.equals(actual) : "testReport failed: expected " + expected + ", but got " + actual; } private static void testHandleGet(HTTPCommands commands) { // Test listing all plugs String expected = "<html><body><a href='/Plug1'>Plug1</a><a href='/Plug2'>Plug2</a><a href='/Plug3'>Plug3</a></body></html>"; String actual = commands.handleGet("/", new HashMap<>()); assert expected.equals(actual) : "testHandleGet failed: expected " + expected + ", but got " + actual; // Test reporting a plug PlugSim plug = new PlugSim("TestPlug"); plug.switchOn(); plug.setPower(123.456); expected = "<html><body>Plug TestPlug is on.Power reading is 123.456.<a href='/TestPlug?action=on'>Switch On</a><a href='/TestPlug?action=off'>Switch Off</a><a href='/TestPlug?action=toggle'>Toggle</a></body></html>"; actual = commands.handleGet("/TestPlug", new HashMap<>()); assert expected.equals(actual) : "testHandleGet failed: expected " + expected + ", but got " + actual; // Test switching a plug on plug.switchOff(); expected = "<html><body>Plug TestPlug is on.Power reading is 0.000.<a href='/TestPlug?action=on'>Switch On</a><a href='/TestPlug?action=off'>Switch Off</a><a href='/TestPlug?action=toggle'>Toggle</a></body></html>"; actual = commands.handleGet("/TestPlug", Map.of("action", "on")); assert expected.equals(actual) : "testHandleGet failed: expected " + expected + ", but got " + actual; // Test switching a plug off plug.switchOn(); expected = "<html><body>Plug TestPlug is off.Power reading is 0.000.<a href='/TestPlug?action=on'>Switch On</a><a href='/TestPlug?action=off'>Switch Off</a><a href='/TestPlug?action=toggle'>Toggle</a></body></html>"; actual = commands.handleGet("/TestPlug", Map.of("action", "off")); assert expected.equals(actual) : "testHandleGet failed: expected " + expected + ", but got " + actual; // Test toggling a plug plug.switchOff(); expected = "<html><body>Plug TestPlug is on.Power reading is 0.000.<a href='/TestPlug?action=on'>Switch On</a><a href='/TestPlug?action=off'>Switch Off</a><a href='/TestPlug?action=toggle'>Toggle</a></body></html>"; actual = commands.handleGet("/TestPlug", Map.of("action", "toggle")); assert expected.equals(actual) : "testHandleGet failed: expected " + expected + ", but got " + actual; // Test handling a non-existent plug expected = null; actual = commands.handleGet("/NonExistentPlug", new HashMap<>()); assert expected == actual : "testHandleGet failed: expected " + expected + ", but got " + actual; } } ```

请逐句解释一下下面的代码import java.util.Arrays; import org.apache.http.client.fluent.Request; import ece448.iot_sim.SimConfig; import ece448.iot_sim.Main; public class GradeP2 { public static void main(String[] args) throws Exception { SimConfig config = new SimConfig( 8080, Arrays.asList("xxxx", "yyyy", "zzzz.789"), null, null, null); try (Main m = new Main(config)) { Grading.run(new GradeP2(), 10); } } private String get(String pathParams) throws Exception { return Request.Get("http://127.0.0.1:8080"+pathParams) .userAgent("Mozilla/5.0") .connectTimeout(1000) .socketTimeout(1000) .execute().returnContent().asString(); } public boolean testCase00() throws Exception { String ret = get("/xxxx"); return (ret.indexOf("xxxx is off") != -1) && (ret.indexOf("xxxx is on") == -1) && (ret.indexOf("Power reading is 0.000") != -1); } public boolean testCase01() throws Exception { String ret = get("/xxxx?action=on"); return (ret.indexOf("xxxx is on") != -1) && (ret.indexOf("xxxx is off") == -1); } public boolean testCase02() throws Exception { String ret = get("/xxxx?action=off"); return (ret.indexOf("xxxx is off") != -1) && (ret.indexOf("xxxx is on") == -1); } public boolean testCase03() throws Exception { String ret = get("/xxxx?action=on"); return (ret.indexOf("xxxx is on") != -1) && (ret.indexOf("xxxx is off") == -1); } public boolean testCase04() throws Exception { String ret = get("/xxxx?action=toggle"); return (ret.indexOf("xxxx is off") != -1) && (ret.indexOf("xxxx is on") == -1); } public boolean testCase05() throws Exception { String ret = get("/xxxx?action=toggle"); return (ret.indexOf("xxxx is on") != -1) && (ret.indexOf("xxxx is off") == -1); } public boolean testCase06() throws Exception { String ret = get("/yyyy"); return (ret.indexOf("yyyy is off") != -1) && (ret.indexOf("yyyy is on") == -1); } public boolean testCase07() throws Exception { String ret = get("/xxxx"); return (ret.indexOf("xxxx is on") != -1) && (ret.indexOf("xxxx is off") == -1); } public boolean testCase08() throws Exception { String ret = get("/zzzz.789"); return (ret.indexOf("Power reading is 0.000") != -1); } public boolean testCase09() throws Exception { get("/zzzz.789?action=on"); Thread.sleep(1500); String ret = get("/zzzz.789"); return (ret.indexOf("Power reading is 789.000") != -1); } } private static final Logger logger = LoggerFactory.getLogger(HTTPCommands.class); }

这段代码是一个 Java 程序，其中引入了几个包： - java.util.Arrays：提供了一系列操作数组的方法。 - org.apache.http.client.fluent.Request：提供了一种轻量级、简单易用的 HTTP 客户端库，可以用来发送 HTTP 请求。 - ece448.iot_sim.SimConfig：定义了一个类，用来配置 IoT 模拟器。 - ece448.iot_sim.Main：IoT 模拟器的主类。程序定义了一个名为 GradeP2 的类，其中包含了一个 main 方法。在 main 方法中，程序创建了一个 SimConfig 实例，并将其传递给 Main 类的构造函数。然后，程序调用 Grading.run 方法，该方法会运行 GradeP2 类中的测试用例。 GradeP2 类中还包含了一些方法，用来执行不同的测试用例。例如，testCase00 方法会向 IoT 模拟器发送一个请求，获取名为 "xxxx" 的设备的状态，并检查返回结果是否符合预期。程序还定义了一个名为 get 的私有方法，该方法用来发送 HTTP 请求并获取响应内容。最后，程序还定义了一个名为 logger 的 Logger 对象，用来记录日志。

> Task :compileTestJava FAILED /home/ubuntu/iot_ece448/src/test/java/ece448/iot_sim/HTTPCommandsTests.java:16: error: unreported exception Exception; must be caught or declared to be thrown String ret = get("/xxxx"); ^

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