解释这段代码:for(String s:Server.hashSocket.keySet()) { if(name.equals(s)){ //如果有重名,就返回状态码1 isRename=true; sendMessage2Client(socket,"1"); System.out.println("发生了重名"); break; } }
时间: 2024-02-10 12:07:29 浏览: 27
这段代码是一个 foreach 循环,其目的是遍历一个 HashMap 类型的 Server.hashSocket。在循环内部,代码判断变量 name 是否与 HashMap 中的某个 key 相等,如果相等,则会将变量 isRename 赋值为 true,并向客户端发送状态码 1,表示重名。同时,程序会打印出一条消息,说明发生了重名。如果没有发现重名,则继续循环下一个 key,直到遍历完整个 HashMap。
相关问题
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("<p><a href='/%s'>%s</a></p>", plugName, plugName)); } sb.append("</body></html>"); return sb.toString(); } protected String report(PlugSim plug) { String name = plug.getName(); return String.format("<html><body>" +"<p>Plug %s is %s.</p>" +"<p>Power reading is %.3f.</p>" +"<p><a href='/%s?action=on'>Switch On</a></p>" +"<p><a href='/%s?action=off'>Switch Off</a></p>" +"<p><a href='/%s?action=toggle'>Toggle</a></p>" +"</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><p><a href='/Plug1'>Plug1</a></p><p><a href='/Plug2'>Plug2</a></p><p><a href='/Plug3'>Plug3</a></p></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><p>Plug TestPlug is on.</p><p>Power reading is 123.456.</p><p><a href='/TestPlug?action=on'>Switch On</a></p><p><a href='/TestPlug?action=off'>Switch Off</a></p><p><a href='/TestPlug?action=toggle'>Toggle</a></p></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><p><a href='/Plug1'>Plug1</a></p><p><a href='/Plug2'>Plug2</a></p><p><a href='/Plug3'>Plug3</a></p></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><p>Plug TestPlug is on.</p><p>Power reading is 123.456.</p><p><a href='/TestPlug?action=on'>Switch On</a></p><p><a href='/TestPlug?action=off'>Switch Off</a></p><p><a href='/TestPlug?action=toggle'>Toggle</a></p></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><p>Plug TestPlug is on.</p><p>Power reading is 0.000.</p><p><a href='/TestPlug?action=on'>Switch On</a></p><p><a href='/TestPlug?action=off'>Switch Off</a></p><p><a href='/TestPlug?action=toggle'>Toggle</a></p></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><p>Plug TestPlug is off.</p><p>Power reading is 0.000.</p><p><a href='/TestPlug?action=on'>Switch On</a></p><p><a href='/TestPlug?action=off'>Switch Off</a></p><p><a href='/TestPlug?action=toggle'>Toggle</a></p></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><p>Plug TestPlug is on.</p><p>Power reading is 0.000.</p><p><a href='/TestPlug?action=on'>Switch On</a></p><p><a href='/TestPlug?action=off'>Switch Off</a></p><p><a href='/TestPlug?action=toggle'>Toggle</a></p></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;
}
}
```
优化这段代码 vMap.put("tags", v.getTags().stream().map(TagDTO::mapping).collect(Collectors.toList())); v.getTags().forEach(t -> { if (t.getId() == 2 || t.getId() == 208) { vMap.put("earTag", t.getName()); } else if (t.getId() == 5) { vMap.put("iflytekTag", t.getName()); } }); if (valueByVersionMap.containsKey(v.getId())) { final Map<Integer, ValueEntity> valueMap = valueByVersionMap.get(v.getId()).stream() .collect(Collectors.toMap(ValueEntity::getPropertyId, value -> value)); valueMap.keySet().forEach(p -> { if (this.propertyMap.containsKey(p)) { final String value = this.getValue(valueMap.get(p).getVal(), this.propertyMap.get(p).getCategory()); if (StringUtils.isNotBlank(value)) { vMap.put(String.valueOf(p), value); } } if (p.equals(11)) { final String value = this.getValue(valueMap.get(p).getVal(), this.propertyMap.get(p).getCategory()); if (StringUtils.isNotBlank(value)) { vMap.put("license", value); } } }); }
这是给定的代码段:
```java
vMap.put("tags",
v.getTags().stream().map(TagDTO::mapping).collect(Collectors.toList()));
v.getTags().forEach(t -> {
if (t.getId() == 2 || t.getId() == 208) {
vMap.put("earTag", t.getName());
} else if (t.getId() == 5) {
vMap.put("iflytekTag", t.getName());
}
});
if (valueByVersionMap.containsKey(v.getId())) {
final Map<Integer, ValueEntity> valueMap = valueByVersionMap.get(v.getId()).stream()
.collect(Collectors.toMap(ValueEntity::getPropertyId, value -> value));
valueMap.keySet().forEach(p -> {
if (this.propertyMap.containsKey(p)) {
final String value = this.getValue(valueMap.get(p).getVal(),
this.propertyMap.get(p).getCategory());
if (StringUtils.isNotBlank(value)) {
vMap.put(String.valueOf(p), value);
}
}
if (p.equals(11)) {
final String value = this.getValue(valueMap.get(p).getVal(),
this.propertyMap.get(p).getCategory());
if (StringUtils.isNotBlank(value)) {
vMap.put("license", value);
}
}
});
}
```
为了优化这段代码,我们可以进行以下几个步骤:
1. 使用方法引用来简化 `v.getTags().stream().map(TagDTO::mapping)` 为 `v.getTags().stream().map(TagDTO::mapping)`。
2. 使用 `forEach` 循环替代多个 `if` 语句来处理 `tags`。
3. 将 `valueByVersionMap` 的值缓存到一个变量中,以提高性能。
4. 将 `valueMap.keySet().forEach` 替换为 `valueMap.forEach`,以简化代码。
以下是优化后的代码:
```java
vMap.put("tags",
v.getTags().stream().map(TagDTO::mapping).collect(Collectors.toList()));
v.getTags().forEach(t -> {
int id = t.getId();
String name = t.getName();
if (id == 2 || id == 208) {
vMap.put("earTag", name);
} else if (id == 5) {
vMap.put("iflytekTag", name);
}
});
if (valueByVersionMap.containsKey(v.getId())) {
Map<Integer, ValueEntity> valueMap = valueByVersionMap.get(v.getId()).stream()
.collect(Collectors.toMap(ValueEntity::getPropertyId, value -> value));
valueMap.forEach((p, value) -> {
if (propertyMap.containsKey(p)) {
String propertyCategory = propertyMap.get(p).getCategory();
String propertyValue = getValue(value.getVal(), propertyCategory);
if (StringUtils.isNotBlank(propertyValue)) {
vMap.put(String.valueOf(p), propertyValue);
}
}
if (p.equals(11)) {
String licenseValue = getValue(value.getVal(), propertyMap.get(p).getCategory());
if (StringUtils.isNotBlank(licenseValue)) {
vMap.put("license", licenseValue);
}
}
});
}
```
这样,代码就更简洁、可读性更高,并且在一些地方进行了性能优化。请注意,这只是一个基本的优化示例,具体的优化策略可能会因上下文而异。
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