json - Spring MVC @RequestBody 给出 415 错误

Question

无论我尝试什么，对调度程序 servlet 的请求都会返回 HTTP 415 错误。 Content-Type 在请求中设置为 application/json。

消息转换器似乎没有将请求映射到对象。

我的 POM 中有所有 Jackson 依赖项:

    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>${jackson-databind-version}</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.module</groupId>
        <artifactId>jackson-module-jaxb-annotations</artifactId>
        <version>2.4.1</version>
    </dependency>
    <dependency>
        <groupId>org.codehaus.jackson</groupId>
        <artifactId>jackson-mapper-asl</artifactId>
        <version>1.9.13</version>
    </dependency>
    <dependency>
        <groupId>com.sun.xml.bind</groupId>
        <artifactId>jaxb-impl</artifactId>
        <version>2.2.7</version>
    </dependency>
    <dependency>
        <groupId>org.apache.xbean</groupId>
        <artifactId>xbean-spring</artifactId>
        <version>3.7</version>
    </dependency>

Controller 类:

@RequestMapping(value = "/login", method = RequestMethod.POST, headers = {"Accept=application/json"}, consumes = MediaType.APPLICATION_JSON_VALUE, produces = MediaType.APPLICATION_JSON_VALUE)
@ResponseBody
public DriverLoginResponseDTO login(@RequestBody MyDTO dto)
{
    System.out.println("login method hit!");
    LoginResponseDTO resp = null;

    try {
        resp = loginService.processLogin(dto);
    }
    catch (Exception cde) {
        resp = new LoginResponseDTO();
        resp.setMessage("ERROR");
    }

    // Return response object
    return resp;
} // login

我尝试在@RequestMapping 中添加接受、消费、生产，但都无济于事。

我可以使用 HttpServletRequest 作为方法参数获得正确的 JSON 响应:

@RequestMapping(value = "/login3", method = RequestMethod.POST)
@ResponseBody
public DriverLoginResponseDTO login3(HttpServletRequest request)
{
    String line;
    StringBuilder sb = new StringBuilder();

    InputStream is;
    try {
        is = request.getInputStream();
        BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));
        while ((line = reader.readLine()) != null) {
            sb.append(line).append("\n");
        }
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    System.out.println("login3 method hit!");
    System.out.println("JSON string received: " + sb.toString());

    LoginResponseDTO resp = null;

    try {
        resp = loginService.processLogin(new MyDTO());
    }
    catch (Exception cde) {
        resp = new LoginResponseDTO();
        resp.setMessage("ERROR");
    }

    // Return response object
    return resp;
} // login

这一个在写入 System.out 时显示正确的 JSON 字符串。在上面的第一个“登录”方法中，有些东西没有将 JSON 请求映射到 RequestBody 对象，但我看不出缺少什么。

我不知道这是否相关，但 Websphere 也抛出以下错误:

SRVE8094W:警告:无法设置标题。响应已提交。

Answer 1

尝试在 @RequestMapping 中设置 consumes = "application/json" 而不是 headers = {"Accept=application/json"}