我正在使用 spring boot。我的 pom.xml 是:
<?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>2.2.1.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.ashwin</groupId>
<artifactId>spring_app_vemployee</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>spring_app_vemployee</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- https://mvnrepository.com/artifact/jstl/jstl -->
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>bootstrap</artifactId>
<version>3.3.6</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>jquery</artifactId>
<version>1.9.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.tomcat.embed/tomcat-embed-jasper -->
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<version>9.0.27</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>
</plugins>
</build>
</project>
我的 Controller 是:
@Controller
@SessionAttributes("name")
public class TodoController {
@Autowired
private ToDoService toDoService;
@RequestMapping(value="/add-todo",method= RequestMethod.GET)
public String showAddToDoPage(ModelMap model){
model.addAttribute("todo", new Todo(0, "abc", "Default Desc",
new Date(), false));
return "todo";
}
}
它要去的jsp是
todo.jsp .当我添加 Spring 表单时，我开始看到错误:<%@taglib uri="http://www.springframework.org/tags/form" prefix="form" %>
<html>
<head>
<title>First web app</title>
<link href="webjars/bootstrap/3.3.6/css/bootstrap.min.css"
rel="stylesheet">
</head>
<body>
<div class="container">
<form:form method="post" commandName="todo">
<fieldset class="form-group">
<form:label path="desc">Description</form:label>
<form:input path="desc" type="text" class="form-control" required="required"/>
</fieldset>
</form:form>
</div>
<script src="webjars/jquery/1.9.1/jquery.min.js"></script>
<script src="webjars/bootstrap/3.3.6/js/bootstrap.min.js"></script>
</body>
</html>
我试图在模型和 Controller 之间绑定(bind)的类是:
public class Todo {
private int id;
private String user;
private String desc;
private Date targetDate;
private boolean isDone;
public Todo() {
super();
}
public Todo(int id, String user, String desc, Date targetDate,
boolean isDone) {
super();
this.id = id;
this.user = user;
this.desc = desc;
this.targetDate = targetDate;
this.isDone = isDone;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUser() {
return user;
}
public void setUser(String user) {
this.user = user;
}
public String getDesc() {
return desc;
}
public void setDesc(String desc) {
this.desc = desc;
}
public Date getTargetDate() {
return targetDate;
}
public void setTargetDate(Date targetDate) {
this.targetDate = targetDate;
}
public boolean getDone() {
return isDone;
}
public void setDone(boolean isDone) {
this.isDone = isDone;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + id;
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
Todo other = (Todo) obj;
if (id != other.id) {
return false;
}
return true;
}
@Override
public String toString() {
return String.format(
"Todo [id=%s, user=%s, desc=%s, targetDate=%s, isDone=%s]", id,
user, desc, targetDate, isDone);
}
}
但我收到错误:
There was an unexpected error (type=Internal Server Error, status=500).
/WEB-INF/jsp/todo.jsp (line: [11], column: [0]) Unable to find setter method for attribute: [commandName]
org.apache.jasper.JasperException: /WEB-INF/jsp/todo.jsp (line: [11], column: [0]) Unable to find setter method for attribute: [commandName]
at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:42)
at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:292)
at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:115)
at org.apache.jasper.compiler.Generator$GenerateVisitor.evaluateAttribute(Generator.java:3015)
at org.apache.jasper.compiler.Generator$GenerateVisitor.generateSetters(Generator.java:3235)
最佳答案
尝试使用 modelAttribute而不是(已弃用)commandName在您的todo.jsp 中的表格中.那应该可以解决它。
关于java - 找不到属性 : Error in spring boot 的设置方法，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/58805047/