JSON Object 没有被 Spring 引导正确反序列化

Question

I am trying to make a post request with Axios to my api, but the JSON is not being deserialized properly into a java object, despite adding the @ResponseBody annotation. object 的字段只是null 。

这是我的 Controller：

@RestController
class WordSearchController {

    private long count;

    @CrossOrigin(origins = "http://localhost:3000")
    @PostMapping(
        value = "/word",
        consumes = {MediaType.APPLICATION_JSON_VALUE}
    )
    public long Search (@RequestBody WordSearch wordsearch) {
        count = wordsearch.search();
        return count;
    }
}

这是我在句柄提交中的 axios.post 调用：

class SubmitForm extends Component {
state = {
    sentence: '',
    word: '',
};
handleSubmit = event => {
    event.preventDefault();
    console.log(this.state.sentence);
    const user = {
        sentence: this.state.sentence,
        word: this.state.word,
    }
    console.log(user)
    axios.post('http://localhost:8080/word', {user})
        .then(res=>{
            console.log(res);
            console.log(res);
        })
}

这是 WordSearch.java：

public class WordSearch {

@JsonProperty("sentence")
private String sentence;
@JsonProperty("word")
private String word; 

public void setSentence(String sentence) {
    this.sentence = sentence;
}

public void setWord(String word) {
    this.word = word;
}

public String getSentence() {
    return this.sentence;
}

public String getWord() {
    return this.word;
}

public long search() {
    Pattern word_pattern = Pattern.compile("\\b" + (this.word) + "\\b");
    Matcher countWord = word_pattern.matcher(this.sentence);
    long count = countWord.results().count();
    /* int count = 0;
    String [] words = (this.sentence).split(" ");
    for (int i = 0; i < words.length; i++) {
        if ((words[i]).equals(this.word)) {
            count++;
        }
    }
    */
    return count; 
}

}

有效载荷显示为{sentence: "hello", word: "world"}

Answer 1

不应该这样： axios.post('http://localhost:8080/word', {user})是这样的： axios.post('http://localhost:8080/word', user)

看起来用户 object 被包装到另一个用户中。

此外，您可以使用 postman 进行测试，看看问题出在客户端还是服务器端。