尝试执行restclient请求时找不到合适的HttpMessageConverter [英] No suitable HttpMessageConverter found when trying to execute restclient request

问题描述

我正在尝试使用 Spring for Android rest client 来发送带有 http post 的数据，以避免创建和解析json数据。

I'm trying to use Spring for Android rest client to send data with an http post , to avoid creating and parsing the json data.

从他们的手册他们有以下方法：

From their manual they have the following method:

restTemplate.postForObject(url, m, String.class)

调用该方法后，我得到以下异常：

After the method is called I get the following exception:

No suitable HttpMessageConverter found when trying to execute restclient request

我的活动代码段是：

RestTemplate restTemplate = new RestTemplate();
restTemplate.getMessageConverters().add(new MappingJacksonHttpMessageConverter());
restTemplate.getMessageConverters().add(new StringHttpMessageConverter());
Message m = new Message();
m.setLibrary("1");
m.setPassword("1395");
m.setUserName("1395");
String result = restTemplate.postForObject(url, m, String.class);

Message对象是：

And the Message object is :

public class Message {
    private String UserName, Password, Library;

    public String getUserName() {
        return UserName;
    }

    public void setUserName(String userName) {
        UserName = userName;
    }

    public String getPassword() {
        return Password;
    }

    public void setPassword(String password) {
        Password = password;
    }

    public String getLibrary() {
        return Library;
    }

    public void setLibrary(String library) {
        Library = library;
    }
}

为什么不能将Message对象转换为JSON ？

推荐答案

可能有几个不同的原因导致这种情况发生。在我的情况下，我已经连接了RestTemplate，但仍然遇到此错误。事实证明，我必须添加对jackson-databind的依赖：

There could be a few different reasons why this can happen. In my case, i had the RestTemplate already wired in, but still got this error. Turns out, i had to add a dependency on "jackson-databind":

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
</dependency>

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