Java Springboot:Localhost:8080导致白页错误，而不是显示内容
我试图用Springboot和Thymeleaf显示一个基因列表。数据库（基因、蛋白质等）和所有方法（如获取基因标识符）都存在并发挥作用。 项目结构为： 我的类/html文件是： 主要内容： 应用程序控制器：Java Springboot:Localhost:8080导致白页错误，而不是显示内容,java,spring-boot,intellij-idea,localhost,thymeleaf,Java,Spring Boot,Intellij Idea,Localhost,Thymeleaf,我试图用Springboot和Thymeleaf显示一个基因列表。数据库（基因、蛋白质等）和所有方法（如获取基因标识符）都存在并发挥作用。 项目结构为： 我的类/html文件是： 主要内容： 应用程序控制器： package gui.spring.controller; import db.admin.DatabaseQuery; import db.admin.local.DatabaseQueryLocal; import db.io.FileReader; import db.samp
package gui.spring.controller;
import db.admin.DatabaseQuery;
import db.admin.local.DatabaseQueryLocal;
import db.io.FileReader;
import db.sample.Gene;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import java.util.List;
@SpringBootApplication
@Controller
public class ApplicationController {
@RequestMapping(value = "/", method=RequestMethod.GET)
public String root(Model model){
DatabaseQuery query = new DatabaseQueryLocal();
new FileReader(query);
List<Gene> genes = query.getGenes();
model.addAttribute("genes", genes);
return "root";
}
}
包gui.spring.controller；
导入db.admin.DatabaseQuery；
导入db.admin.local.DatabaseQueryLocal；
导入db.io.FileReader；
导入db.sample.Gene；
导入org.springframework.boot.autoconfigure.springboot应用程序；
导入org.springframework.stereotype.Controller；
导入org.springframework.ui.Model；
导入org.springframework.web.bind.annotation.RequestMapping；
导入org.springframework.web.bind.annotation.RequestMethod；
导入java.util.List；
@SpringBoot应用程序
@控制器
公共类应用程序控制器{
@RequestMapping（value=“/”，method=RequestMethod.GET）
公共字符串根（模型）{
DatabaseQuery query=新建DatabaseQueryLocal（）；
新文件阅读器（查询）；
List genes=query.getGenes（）；
添加属性（“基因”，基因）；
返回“根”；
}
}
<!DOCTYPE html>
<html lang="en" xmlns:th="http://thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<th:block th:each="gene:${genes} ">
<p th:text="${gene.getIdentifier()}"></p>
</th:block>
</body>
</html>
标题
<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>1.0.0</modelVersion>
<groupId>SpringBoot</groupId>
<artifactId>biosampledb</artifactId>
<version>1.0-SNAPSHOT</version>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.3.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<type>jar</type>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
<version>1.4.6.RELEASE</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.7</version>
</dependency>
</dependencies>
</project>
1.0.0
弹簧靴
UPDATE2:DatabaseQuery和DatabaseQueryLocal
这是DatabaseQuery接口（已提供）
package db.admin；
导入db.sample.Assay；
导入db.sample.Gene；
导入db.sample.Protein；
导入org.apache.commons.lang3.*；
导入java.util.List；
导入java.util.Optional；
公共接口数据库查询{
列表
IntelliJ的执行日志。当
在浏览器中调用“localhost:8080”。之后使用停止按钮手动终止进程。模板的默认thymeleaf前缀（它是属性：spring.thymeleaf.prefix）是：classpath:/templates/
如果您将root.html移动到src/main/resources/templates，如果我没有遗漏任何其他内容，它应该可以工作。对于staters，请停止混合Spring启动版本（2.0.3和1.4.6）。其次，您的项目设置没有遵循所需的（和建议的）要求设置。首先，你的模板目录是错误的，db
包中的所有内容都被Spring Boot忽略了（因此，如果你在那里使用自动布线，它将不起作用）。谢谢你，我不想制造混乱。我在哪里混合它？你的百里香叶启动器来自1.4.6（只需删除版本就可以修复它）此外，这不是混淆，而是将不属于同一个版本的内容混合在一起。
<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>1.0.0</modelVersion>
<groupId>SpringBoot</groupId>
<artifactId>biosampledb</artifactId>
<version>1.0-SNAPSHOT</version>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.3.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<type>jar</type>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
<version>1.4.6.RELEASE</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.7</version>
</dependency>
</dependencies>
</project>
package db.admin;
import db.sample.Assay;
import db.sample.Gene;
import db.sample.Protein;
import org.apache.commons.lang3.*;
import java.util.List;
import java.util.Optional;
public interface DatabaseQuery {
List<Assay> getAssays();
List<Gene> getGenes();
List<Protein> getProteins();
void addAssay(Assay assay);
void addGene(Gene gene);
void addProtein(Protein protein);
/**
* Returns all Assays that used a Protein that is associated with the given gene.
*
* @param gene - gene to get the proteins
*
* @return list of associated assays
*/
List<Assay> getAssaysByGene(Gene gene);
/**
* Returns all Proteins that have a measurement above or equal to 'meas' in any Assay
*
* @param meas - threshold value
* @return A list of tuples (Pairs) where the Protein is left and the measured score from the assay is right
*/
List<Pair<Protein, Double>> getAssayResultsByMeas(Double meas);
/**
* Return all Scores and assoc. Assays for a given Protein
*
* @param protein - protein to look up
* @return List of Pairs of assays and results for the given protein on that assay
*/
List<Pair<Assay, Double>> getScores(Protein protein);
/**
* Returns a protein by given identifier. Returns Optinal.empty if there is no protein with this name
*
* @param identifier - id of the protein
* @return Optional protein
*/
Optional<Protein> getProteinByName(String identifier);
/**
* Returns a gene by given identifier. Returns Optinal.empty if there is no gene with this name
*
* @param name - id of a gene
* @return Optional protein
*/
Optional<Gene> getGeneByName(String name);
/**
* Returns a assay by given identifier. Returns Optinal.empty if there is no assay with this name
*
* @param name - id of a gene
* @return Optional protein
*/
Optional<Assay> getAssayByName(String name);
}
package db.admin.local;
import db.admin.DatabaseQuery;
import db.sample.Assay;
import db.sample.Gene;
import db.sample.Protein;
import org.apache.commons.lang3.*;
import org.apache.commons.lang3.tuple.ImmutablePair;
//import org.apache.commons.lang3.tuple.ImmutablePair;
//import org.apache.commons.lang3.tuple.Pair;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;
public class DatabaseQueryLocal implements DatabaseQuery {
private final DatabaseLocal db;
public DatabaseQueryLocal() {
this.db = DatabaseLocal.getInstance();
}
@Override
public List<Assay> getAssays(){
return db.assayList;
}
@Override
public List<Gene> getGenes(){
return db.geneList;
}
@Override
public List<Protein> getProteins(){
return db.proteinList;
}
@Override
public void addAssay(Assay assay){
db.assayList.add(assay);
}
@Override
public void addGene(Gene gene){
db.geneList.add(gene);
}
@Override
public void addProtein(Protein protein){
db.proteinList.add(protein);
}
/**
* Returns all Assays that used a Protein that is associated with the given gene.
*
* @param gene - gene to get the proteins
*
* @return list of associated assays
*/
@Override
public List<Assay> getAssaysByGene(Gene gene){
Protein protein = gene.getProtein();
return this.getAssays().stream()
.filter(assay -> assay.getUsedProteins().contains(protein))
.collect(Collectors.toList());
}
/**
* Returns all Proteins that have a measurement above or equal to 'meas' in any Assay
*
* @param meas - threshold value
* @return A list of pairs where the Protein is left and the measured score from the assay is right
*/
@Override
public List<Pair<Protein, Double>> getAssayResultsByMeas(Double meas){
List<Pair<Protein, Double>> results = new ArrayList<>();
for(Assay assay: getAssays()){
List<Double> measurements = assay.getMeasurements();
List<Protein> proteins = assay.getUsedProteins();
for (int i = 0; i < measurements.size(); i++) {
Double m = measurements.get(i);
if(m >= meas){
//results.add(new ImmutablePair<Protein,Double>(proteins.get(i), m));
results.add(new Pair<>(proteins.get(i), m));
}
}
}
return results;
}
/**
* Return all Scores and assoc. Assays for a given Protein
*
* @param protein - protein to look up
* @return List of Pairs of assays and results for the given protein on that assay
*/
@Override
public List<Pair<Assay, Double>> getScores(Protein protein) {
List<Pair<Assay, Double>> results = new ArrayList<>();
for (Assay assay : getAssays()) {
List<Double> measurements = assay.getMeasurements();
List<Protein> proteins = assay.getUsedProteins();
for (int i = 0; i < proteins.size(); i++) {
if (proteins.get(i).equals(protein)) {
results.add(new Pair<>(assay, measurements.get(i)));
//results.add(new ImmutablePair<Assay,Double>(assay, measurements.get(i)));
// http://www.javased.com/index.php?api=org.apache.commons.lang3.tuple.Pair
// https://www.programcreek.com/java-api-examples/?api=org.apache.commons.lang3.tuple.ImmutablePair
}
}
}
return results;
}
/**
* Returns a protein by given identifier. Returns Optional.empty if there is no protein with this name
*
* @param identifier - id of the protein
* @return Optional protein
*/
@Override
public Optional<Protein> getProteinByName(String identifier){
Optional<Protein> r = this.getProteins().stream().filter(p -> p.getIdentifier().equals(identifier)).findFirst();
if(!r.isPresent()){
System.err.println("DBQueryLocal: could not find protein by name: " + identifier);
}
return r;
}
/**
* Returns a gene by given identifier. Returns Optional.empty if there is no gene with this name
*
* @param name - id of a gene
* @return Optional protein
*/
@Override
public Optional<Gene> getGeneByName(String name){
return this.getGenes().stream().filter(p -> p.getIdentifier().equals(name)).findFirst();
}
/**
* Returns a assay by given identifier. Returns Optional.empty if there is no assay with this name
*
* @param name - id of a gene
* @return Optional protein
*/
@Override
public Optional<Assay> getAssayByName(String name){
return this.getAssays().stream().filter(p -> p.getName().equals(name)).findFirst();
}
}