javax.ws.rs.ProcessingException：找不到内容类型application / x-www-form-urlencoded类型的writer

Question

我正在 MediaType.APPLICATION_FORM_URLENCODED_TYPE 中使用“resteasy-client”库发送POST请求。

示例代码：

String serviceUrl = "URL";

    ConnectRequest connectRequest = new ConnectRequest();
    connectRequest.setUsername("");
    connectRequest.setPassword("");
    connectRequest.setScope("bearer");
    connectRequest.setGrant_type("");

    Entity<ConnectRequest> entity = Entity.entity(connectRequest,
                MediaType.APPLICATION_FORM_URLENCODED_TYPE);

    ResteasyClient client = new ResteasyClientBuilder().build();
    ResteasyWebTarget target = client.target(serviceUrl);

    Response response = target.request().post(entity);

    System.out.println("RESP : "+response.toString());

Maven Dependencies

    <properties>
    <java.version>1.7</java.version>
    <resteasy.version>3.0.4.Final</resteasy.version>
</properties>
<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.jboss.resteasy</groupId>
            <artifactId>resteasy-client</artifactId>
            <version>${resteasy.version}</version>
        </dependency>
        <dependency>
            <groupId>org.jboss.resteasy</groupId>
            <artifactId>resteasy-jackson-provider</artifactId>
            <version>${resteasy.version}</version>
        </dependency>
        <dependency>
            <groupId>org.jboss.resteasy</groupId>
            <artifactId>resteasy-servlet-initializer</artifactId>
            <version>${resteasy.version}</version>
        </dependency>
        <dependency>
            <groupId>org.jboss.resteasy</groupId>
            <artifactId>resteasy-jaxrs</artifactId>
            <version>${resteasy.version}</version>
        </dependency>
        <dependency>
            <groupId>org.jboss.resteasy</groupId>
            <artifactId>jaxrs-api</artifactId>
            <version>${resteasy.version}</version>
        </dependency>
        <dependency>
            <groupId>org.jboss.resteasy</groupId>
            <artifactId>resteasy-jaxb-provider</artifactId>
            <version>${resteasy.version}</version>
        </dependency>
        <dependency>
            <groupId>org.jboss.resteasy</groupId>
            <artifactId>resteasy-multipart-provider</artifactId>
            <version>${resteasy.version}</version>
        </dependency>
</dependencies>     

  

连接工作正常，同时发送正确的响应   请求使用POSTMAN

但在请求使用该程序后，它会将错误创建为

回应：

  

javax.ws.rs.ProcessingException：找不到编写器   content-type application / x-www-form-urlencoded type

请帮忙......

Answer 1

您无法使用POJO发送application/x-www-form-urlencoded。您需要使用javax.ws.rs.core.Form类。

Form connectRequest = new Form()
    .param("username", "...")
    .param("password", "...")
    .param("client_id")
    ...;

您也可以使用Entity.form(connectionRequest)，这是速记，因此您不必使用MediaType.APPLICATION_FORM_URLENCODED_TYPE。

另外，请参阅this also以解析响应。你不需要依赖。你已经有了RESTEasy的那个。

Answer 2

我创建了一组可以导入的读取器/写入器，它们可以处理将表单编码自动绑定到java对象：https://github.com/exabrial/form-binding比创建Form实例要容易一些。