内容类型为application/x-www-form-urlencoded的HTTP Post请求在spring boot服务中不起作用

Question

我是一个新的spring boot最近，我试图做HTTP POST请求从一个android应用程序通过reverfit2 rest API库与application/x-www-form-url编码，但当我击中我的spring boot POST服务，它显示我以下错误

“状态”：415,“错误”：“不支持的媒体类型”,“异常”：“org.springframework.web.httpmediatypenotsupportedexception”,“消息”：“内容类型'application/x-www-form-urlencoded；charset=utf-8'不支持”,“路径”：“/api/login”

有人能知道怎么解决吗？

这里是我的代码Android代码示例

apiservice.java

public interface ApiService {
    @FormUrlEncoded
    @POST("/api/login")
    Call<LoginData> postLogIn(
            @Field("username") String username,
            @Field("password") String password);
}

apiHandler.java

    private static final String SERVER_URL = "http://192.168.0.12:8080/";
    private static final long CONNECTION_TIMEOUT = 30;
    public static Retrofit restAdapter;

    //public static final int CONNECTION_TIME_OUT = 120;
    private static Retrofit getRestAdapter() {
        if (restAdapter == null) {
            restAdapter = new Retrofit.Builder()
                    .baseUrl(SERVER_URL)
                    .addConverterFactory(GsonConverterFactory.create())
                    .client(getClient()).build();
        }
        return restAdapter;
    }

    private static OkHttpClient getClient() {
        OkHttpClient.Builder okClientBuilder = new OkHttpClient.Builder();
        HttpLoggingInterceptor httpLoggingInterceptor = new HttpLoggingInterceptor();
        httpLoggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
        okClientBuilder.addInterceptor(httpLoggingInterceptor);
        okClientBuilder.connectTimeout(CONNECTION_TIMEOUT, TimeUnit.SECONDS);
        okClientBuilder.readTimeout(CONNECTION_TIMEOUT, TimeUnit.SECONDS);
        okClientBuilder.writeTimeout(CONNECTION_TIMEOUT, TimeUnit.SECONDS);
        return okClientBuilder.build();
    }

postHandler.java

@Override
    public void callAPI(final Context context, final ApiClientResponse callback, Object arg0) {
        this.callback = callback;
        apiService.postLogIn(Login.username, Login.password).enqueue(new Callback<LoginData>() {
            @Override
            public void onResponse(Call<LoginData> call, Response<LoginData> response) {
                if (response.isSuccessful()) {
                    LoginData loginData = response.body();
                    successLoginData = loginData;
                    successCallBack();
                } else {
                    ApiErrorHandler.handleError(context, response, errorResponse);
                }
            }

            @Override
            public void onFailure(Call<LoginData> call, Throwable t) {
                ApiErrorHandler.handleError(context, t, errorResponse);
            }

            RetrofitErrorResponse errorResponse = new RetrofitErrorResponse() {
                @Override
                public void errorMessage(String errorMessage) {
                    failureCallBack(errorMessage);
                }

                @Override
                public void tSyncError() {

                }

                @Override
                public void invalidTokenError() {

                }
            };

        });
    }

LoginData.java模型类

@Generated("org.jsonschema2pojo")
public class LoginData {
    @SerializedName("access_token")
    @Expose
    private String accessToken;
    @SerializedName("token_type")
    @Expose
    private String tokenType;
    @SerializedName("refresh_token")
    @Expose
    private String refreshToken;
    @SerializedName("expires_in")
    @Expose
    private long expiresIn;
    @SerializedName("scope")
    @Expose
    private String scope;

    // getter setter 
}

下面是我的spring boot应用程序代码示例

MainApplicationClass.java

@SpringBootApplication
public class MainApplicationClass {
    public static void main(String[] args) {
        SpringApplication.run(MainApplicationClass.class, args);
    }
}

controller.java

@RestController
public class BlogController {
    @Autowired
    BlogRespository blogRespository;
    BlogMockedData blogMockedData = BlogMockedData.getInstance();

    @GetMapping("/blog")
    public List<Blog> index() {
        return blogMockedData.fetchBlogList();
    }

    @GetMapping("/blog/{id}")
    public Blog show(@PathVariable String id) {
        int blogId = Integer.parseInt(id);
        return blogMockedData.getBlogById(blogId);
    }

    @PostMapping(value = "/api/login",
            consumes = {MediaType.APPLICATION_JSON_VALUE, MediaType.APPLICATION_FORM_URLENCODED_VALUE},
            produces = {MediaType.APPLICATION_JSON_UTF8_VALUE, MediaType.APPLICATION_JSON_VALUE}
    )
    public LoginData postLogin(@RequestBody Map<String, String> body) {
        String userName = body.get("username");
        String password = body.get("password");
        return blogMockedData.getLoginToken(userName, password);
    }

注：如果我从邮递员那里点击spring boot邮政服务，我会得到以下结果

但如果我从我的android客户endpoint击POST服务，它就会给我带来错误

“状态”：415,“错误”：“不支持的媒体类型”,“异常”：“org.springframework.web.httpmediatypenotsupportedexception”,“消息”：“内容类型'application/x-www-form-urlencoded；charset=utf-8'不支持”,“路径”：“/api/login”

Answer 1

为了使spring正确加载表单编码数据，您需要将端点参数定义为：

public LoginData postLogin(@RequestBody MultiValueMap<String, String> body)

或

public LoginData postLogin(@RequestParam Map<String, String> body)

Answer 2

在使用application/x-www-form-urlencoded时，spring并不把它理解为RequestBody。因此，删除映射数据的参数列表中的@RequestBody注释，就像我在那里看到的那样。

请阅读这篇spring不懂应用程序/x-www-form-urlencoded