HashMap<String, String> itemNameMap3 = new HashMap<String, String>(); // 办理流程 itemNameMap3.put("isUse", "1"); itemNameMap3.put("itemName", "无"); itemNameMap3.put("cnname", "办理流程"); itemNameMap3.put("enname", "itemName"); universalAnswers.add(itemNameMap3);

这段代码是在 Java 编程语言中创建了一个 HashMap 类型的对象 itemNameMap3，并且向其中添加了四个键值对。具体来说： 1. 第一行代码创建了一个 HashMap 对象，该对象的键类型是 String，值类型也是 String。 2. 接下来四行代码分别向 itemNameMap3 中添加了四个键值对，键分别是 "isUse"、"itemName"、"cnname"、"enname"，对应的值分别是 "1"、"无"、"办理流程"、"itemName"。 3. 最后一行代码将 itemNameMap3 添加到了一个名为 universalAnswers 的 List 对象中。这段代码的作用可能是将上述四个键值对作为通用答案加入到一个答案列表中，以便在后续的代码中使用。

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; } } ```

mybatisPlus Map<String, String>

MyBatis Plus is an enhanced version of the MyBatis framework, which is a popular persistence framework for Java. It simplifies the usage of MyBatis and provides additional features. In MyBatis Plus, you can use the `Map<String, String>` type to represent key-value pairs. This can be useful in scenarios where you want to pass dynamic parameters to a SQL query or store dynamic properties in a database column. Here's an example of how you can use `Map<String, String>` with MyBatis Plus: ```java import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper; import com.baomidou.mybatisplus.extension.service.additional.query.impl.QueryChainWrapper; import java.util.HashMap; import java.util.Map; public class MyBatisPlusExample { public static void main(String[] args) { // Create a map with key-value pairs Map<String, String> params = new HashMap<>(); params.put("name", "John"); params.put("age", "30"); // Create a query wrapper QueryWrapper<User> queryWrapper = new QueryWrapper<>(); // Add conditions using the map params.forEach((key, value) -> queryWrapper.eq(key, value)); // Execute the query UserMapper userMapper = new UserMapper(); List<User> userList = userMapper.selectList(queryWrapper); } } ``` In this example, we create a `Map<String, String>` called `params`, which contains key-value pairs representing the conditions we want to add to the query. We then iterate over the map using `forEach` and add each condition to the `QueryWrapper` using the `eq` method. Finally, we execute the query and retrieve the results. Note that this is just a basic example, and you can use `Map<String, Object>` if you need to handle values of different types. MyBatis Plus provides many other features and utilities that can simplify your database operations.

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HashMap<String, String> itemNameMap3 = new HashMap<String, String>(); // 办理流程 itemNameMap3.put("isUse", "1"); itemNameMap3.put("itemName", "无"); itemNameMap3.put("cnname", "办理流程"); itemNameMap3.put("enname", "itemName"); universalAnswers.add(itemNameMap3);

mybatisPlus Map<String, String>

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