Javascript删除不会触发Java后端
我正在开发一个带有React前端和Java后端(springboot)的应用程序。我在前端有一个按钮,用来删除我的实体。当我单击它时,它会将其从UI中删除,但它仍然存在于后端。当我刷新页面时,它只是再次出现。有人注意到我做错了什么吗 编辑:后端和前端反应的唯一位置是后端中有交叉原点的位置。每种方法都有这样的方法吗?或者我甚至不应该这样做?此外,我认为后端API功能正确。当通过邮递员进行测试时,一切都正常工作,但没有任何东西从react前端触发 编辑2:假设我通过一个id为3的邮递员邮寄了一瓶啤酒。因此,当我在remove函数的控制台中打印id时,它是3,但随后我得到了错误DELETE$%7BbeerId%7D/404(未找到)。为什么要将id从3转换为$%7BbeerId%7D?它们在技术上是一样的吗 Homebrews.jsJavascript删除不会触发Java后端,javascript,java,spring,reactjs,Javascript,Java,Spring,Reactjs,我正在开发一个带有React前端和Java后端(springboot)的应用程序。我在前端有一个按钮,用来删除我的实体。当我单击它时,它会将其从UI中删除,但它仍然存在于后端。当我刷新页面时,它只是再次出现。有人注意到我做错了什么吗 编辑:后端和前端反应的唯一位置是后端中有交叉原点的位置。每种方法都有这样的方法吗?或者我甚至不应该这样做?此外,我认为后端API功能正确。当通过邮递员进行测试时,一切都正常工作,但没有任何东西从react前端触发 编辑2:假设我通过一个id为3的邮递员邮寄了一瓶啤酒
import * as React from 'react';
import './Homebrews.css';
import { Button, ButtonGroup, Container, Table } from 'reactstrap';
class Homebrews extends React.Component{
constructor(props) {
super(props);
this.state = {
beers: [],
isLoading: false
};
this.remove = this.remove.bind(this);
}
componentDidMount() {
this.setState({isLoading: true});
fetch('http://localhost:8082/homebrews')
.then(response => response.json())
.then(data => this.setState({beers: data, isLoading: false}));
}
async remove(id) {
await fetch('/homebrews/${id}', {
method: 'DELETE',
headers: {
'Accept': 'application/json',
'Content-Type': 'application/json'
}
}).then(() => {
let updatedBeers = [...this.state.beers].filter(i => i.id !== id);
this.setState({beers: updatedBeers});
});
}
render() {
const {beers, isLoading} = this.state;
if (isLoading) {
return <p>Loading...</p>;
}
return (
<div className="Brew-Data">
<h2>Homebrew List</h2>
{beers.map((beer: Homebrews) =>
<div key={beer.id} className="Square">
<div key={beer.id} className="Data">
<h2>{beer.beerName}</h2>
<Button size="sm" color="danger" onClick={() => this.remove(beer.id)}>Delete</Button>
</div>
</div>
)}
</div>
);
}
}
export default Homebrews;
这里的语法不正确:
wait fetch('/homebrews/${id}'{
因此,将上述内容更改为:
wait fetch(`/homebrews/${id}`{
您的后端API成功删除记录了吗?您可以发布自制类吗?您也可以将id传递给删除函数您不必传递自制对象1。检查浏览器网络它调用正确的API url并返回200。2.您需要调试后端是否正常工作,并且删除值您还需要efine@Transactional for DAO层删除数据我的后端API工作正常,我已经用postman和它的fine对它进行了测试。但是当我尝试从前端删除时,它不工作。我现在也将发布自制类。我有点困惑,这不是我目前拥有的吗?对不起,只是想澄清一下!@alexaggs backquote是`,so这不是你目前拥有的。但是我真的不知道你为什么应该拥有,这可能不是问题所在。`/homebrews/${id}`,请注意引号中的小差异。这样模板参数将被替换。使用单引号不会发生这种情况。如果您将传入的id记录到服务器端,您将看到它可能是${id}
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
@RestController
public class HomebrewController {
@Autowired
private HomebrewService hbService;
@RequestMapping("/homebrews")
@CrossOrigin(origins = "http://localhost:3000")
public List<HomebrewBeer> getAllBeers() {
return hbService.getAllBeers();
}
@RequestMapping("/homebrews/{id}")
public HomebrewBeer getBeer(@PathVariable String id) {
return hbService.getBeer(id);
}
@RequestMapping(method = RequestMethod.POST, value="/homebrews")
public void addBeer(@RequestBody HomebrewBeer beer) {
hbService.addBeer(beer);
}
@RequestMapping(method = RequestMethod.PUT, value="/homebrews/{id}")
public void updateBeer(@RequestBody HomebrewBeer beer, @PathVariable String id) {
hbService.updateBeer(beer, id);
}
@RequestMapping(method = RequestMethod.DELETE, value="/homebrews/{id}")
public void deleteBeer(@PathVariable String id) {
hbService.deleteBeer(id);
}
import java.util.ArrayList;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class HomebrewService {
@Autowired
HomebrewRepository repository;
public List<HomebrewBeer> getAllBeers() {
List<HomebrewBeer> beers = new ArrayList<HomebrewBeer>();
repository.findAll().forEach(beers::add);
return beers;
}
public HomebrewBeer getBeer(String id) {
return repository.findOne(id);
}
public void addBeer(HomebrewBeer beer) {
repository.save(beer);
}
public void updateBeer(HomebrewBeer beer, String id) {
repository.save(beer);
}
public void deleteBeer(String id) {
repository.delete(getBeer(id));
}
}
import org.springframework.data.repository.CrudRepository;
public interface HomebrewRepository extends CrudRepository<HomebrewBeer,
String> {
}
import javax.persistence.Entity;
import javax.persistence.Id;
@Entity
public class HomebrewBeer {
@Id
private String beerId;
private String beerName;
private String beerStyle;
private String description;
private Boolean usedOnlineRecipe;
private double abv, originalGravity, finalGravity, specificGravity;
public HomebrewBeer() {}
public HomebrewBeer(String beerId, String beerName, String beerStyle, Boolean
usedOnlineRecipe, String description,
double abv, double originalGravity, double finalGravity,
double specificGravity) {
this.beerId = beerId;
this.beerName = beerName;
this.beerStyle = beerStyle;
this.usedOnlineRecipe = usedOnlineRecipe;
this.description = description;
this.abv = abv;
this.originalGravity = originalGravity;
this.finalGravity = finalGravity;
this.specificGravity = specificGravity;
}
public void setBeerId(String beerId) {
this.beerId = beerId;
}
public void setBeerName(String beerName) { this.beerName = beerName; };
public void setBeerStyle(String beerStyle) {
this.beerStyle = beerStyle;
}
public void setUsedOnlineRecipe(Boolean usedOnlineRecipe) {
this.usedOnlineRecipe = usedOnlineRecipe;
}
public void setDescription(String description) {
this.description = description;
}
public void setAbv(double abv) {
this.abv = abv;
}
public void setOriginalGravity(double originalGravity) {
this.originalGravity = originalGravity;
}
public void setFinalGravity(double finalGravity) {
this.finalGravity = finalGravity;
}
public void setSpecificGravity(double specificGravity) {
this.specificGravity = specificGravity;
}
public String getBeerId() {
return beerId;
}
public String getBeerName() { return beerName; };
public String getBeerStyle() {
return beerStyle;
}
public Boolean getUsedOnlineRecipe() {
return usedOnlineRecipe;
}
public String getDescription() {
return description;
}
public double getAbv() {
return abv;
}
public double getOriginalGravity() {
return originalGravity;
}
public double getFinalGravity() {
return finalGravity;
}
public double getSpecificGravity() {
return specificGravity;
}