java - 当我使用spring boot maven项目mysql-connector并将数据作为发布请求插入数据库时,但不将数据保存在数据库中
问题描述
我收到了这个错误
2021-02-04 10:31:48.341 WARN 6496 --- [nio-8080-exec-8] .wsmsDefaultHandlerExceptionResolver:已解决 [org.springframework.http.converter.HttpMessageNotReadableException:JSON 解析错误:无法构造实例
com.sun.org.apache.xpath.internal.operations.String
(尽管在至少存在一个创建者):没有字符串参数构造函数/工厂方法可以从字符串值反序列化('springboot@gmail.com');嵌套异常是 com.fasterxml.jackson.databind.exc.MismatchedInputException:无法构造实例com.sun.org.apache.xpath.internal.operations.String
(尽管至少存在一个 Creator):没有从字符串值反序列化的字符串参数构造函数/工厂方法('springboot@gmail.com')在 [来源:(PushbackInputStream);line: 5, column: 13](通过引用链:com.sample.springbootdemo.domain.UserDTO["email"])
我的代码是,
<?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>2.4.2</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.sample</groupId>
<artifactId>springboot-demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>springboot-demo</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>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
我的域名是
package com.sample.springbootdemo.domain;
import com.sun.org.apache.xpath.internal.operations.String;
import javax.persistence.*;
@Entity // This tells Hibernate to make a table out of this class
@Table(name = "user")
public class UserDTO {
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
@Column(name = "user_id" )
private Integer id;
@Column(name = "first_name",columnDefinition = "varchar(255)")
private String firstName;
@Column(name = "last_name",columnDefinition = "varchar(255)")
private String lastName;
@Column(name = "age")
private Integer age;
@Column(name = "email",columnDefinition = "varchar(255)")
private String email;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
}
** 我的控制器是,**
package com.sample.springbootdemo.controllers;
import com.sample.springbootdemo.domain.UserDTO;
import com.sample.springbootdemo.services.UserServices;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.List;
@RestController
@RequestMapping(path="/user")
public class User {
@Autowired
private UserServices userServices;
@GetMapping("/all")
public List<UserDTO> allUsers(){
return userServices.findAllUsers();
}
@PostMapping(path = "/add")
public String addUser(@RequestBody UserDTO Userdata){
return userServices.saveUser(Userdata);
}
}
请帮我解决这个错误。
解决方案
“字符串”应该是 java 自带的。不要使用 import "com.sun.org.apache.xpath.internal.operations.String" 从您的 UserDTO 中删除该行。