这个应用程序应该从网页中获取有关冠状病毒的信息，并将其输出到我们自己网页上的一个漂亮的表中。
所有的表头都在那里，但列本身是空的。
Thymelaf不会在模型中显示传递给它的数据，尽管数据在控制器中正确传递。如果有任何意见，我将不胜感激。
LocationStats.java(已编辑(
package io.javabrains.coronavirustracker.models;
public class LocationStats
{
private String state;
private String country;
private int latestTotalCases;
public String getState() { return this.state; }
public void setState(String state) { this.state = state; }
public String getCountry() { return this.country; }
public void setCountry(String country) { this.country = country; }
public int getLatestTotalCases() { return this.latestTotalCases; }
public void setLatestTotalCases(int latestTotalCases) { this.latestTotalCases = latestTotalCases; }
@Override
public String toString()
{
return "LocationStats{" + "state='" + state + ''' + ", country='" + country + ''' + ", latestTotalCases=" + latestTotalCases + '}';
}
}
CoronaVirusDataService.java
package io.javabrains.coronavirustracker.services;
import io.javabrains.coronavirustracker.models.LocationStats;
import org.apache.commons.csv.CSVFormat;
import org.apache.commons.csv.CSVRecord;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Service;
import javax.annotation.PostConstruct;
import java.io.IOException;
import java.io.StringReader;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.util.ArrayList;
import java.util.List;
@Service
public class CoronaVirusDataService
{
private static String VIRUS_DATA_URL = "https://raw.githubusercontent.com/CSSEGISandData/COVID-19/master/csse_covid_19_data/csse_covid_19_time_series/time_series_covid19_confirmed_global.csv";
private List<LocationStats> allStats = new ArrayList<>();
public List<LocationStats> getAllStats() { return allStats; }
@PostConstruct
@Scheduled(cron = "* * 1 * * *")
public void fetchVirusData() throws IOException, InterruptedException
{
List<LocationStats> newStats = new ArrayList<>();
HttpClient client = HttpClient.newHttpClient();
HttpRequest request = HttpRequest.newBuilder().uri(URI.create(VIRUS_DATA_URL)).build();
HttpResponse<String> httpResponse = client.send(request, HttpResponse.BodyHandlers.ofString());
System.out.println(httpResponse.body()); // Prints all data as expected
StringReader csvBodyReader = new StringReader(httpResponse.body());
Iterable<CSVRecord> records = CSVFormat.DEFAULT.withFirstRecordAsHeader().parse(csvBodyReader);
for(CSVRecord record : records)
{
LocationStats locationStat = new LocationStats();
locationStat.setCountry(record.get("Country/Region"));
locationStat.setState(record.get("Province/State"));
locationStat.setLatestTotalCases(Integer.parseInt(record.get(record.size() - 1)));
newStats.add(locationStat);
System.out.println(locationStat); // Prints data as expected
}
this.allStats = newStats;
}
}
HomeController.java
package io.javabrains.coronavirustracker.controllers;
import io.javabrains.coronavirustracker.models.LocationStats;
import io.javabrains.coronavirustracker.services.CoronaVirusDataService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import java.util.List;
@Controller
public class HomeController
{
@Autowired
CoronaVirusDataService coronaVirusDataService;
@GetMapping("/")
public String home(Model model)
{
List<LocationStats> allStats = coronaVirusDataService.getAllStats();
int testNumber = 999; // For test attribute
model.addAttribute("locationStats", allStats); // Actual attribute
model.addAttribute("testInt", testNumber); // Test attribute
return "home";
}
}
home.html(已编辑(
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org">
<head>
<title>Corona Virus Tracker Application</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<h1 th:text="${testInt}">-1</h1>
<table>
<tr>
<th>State</th>
<th>Country</th>
<th>Total Cases</th>
</tr>
<tr th:each="locationStat : ${locationStats}">
<td th:text="${locationStat.state}"></td>
<td th:text="${locationStat.country}"></td>
<td th:text="${locationStat.latestTotalCases}">0</td>
</tr>
</table>
</body>
</html>
CoronavirusTrackerApplication.java
package io.javabrains.coronavirustracker;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableScheduling;
@SpringBootApplication
@EnableScheduling
public class CoronavirusTrackerApplication
{
public static void main(String[] args)
{
SpringApplication.run(CoronavirusTrackerApplication.class, args);
}
}
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.2.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>io.javabrains</groupId>
<artifactId>coronavirus-tracker</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>coronavirus-tracker</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>14</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-csv</artifactId>
<version>1.8</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>14</source>
<target>14</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
网页的当前状态
Thymelaf只能通过getter访问数据。将getter添加到LocationStats类中。
澄清：
当你用Thymelaf:写作时
<td th:text="${locationStat.state}"></td>
Thymelaf中的.state使用类中定义的getter来检索状态。没有getter=没有thymelaf表示。