Question

我一直试图通过REST服务发送Java对象列表，但每当我尝试将其转换回Java数组时，我都会收到JSON解析错误：

2018-06-10 10:50:08.044  WARN 13680 --- [nio-8080-exec-3] .w.s.m.s.DefaultHandlerExceptionResolver : 
   Failed to read HTTP message: org.springframework.http.converter.HttpMessageNotReadableException: 
   JSON parse error: Can not deserialize instance of com.master.entity.Greeting[] out 
   of START_OBJECT token; nested exception is 
   com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize 
   instance of com.master.entity.Greeting[] out of START_OBJECT token
   at [Source: java.io.PushbackInputStream@1e32b2a; line: 1, column: 1]

这是Greeting类：

public class Greeting {

private final long id;
private final String content;

public Greeting() {
    id = 0;
    content = "something";
}

public Greeting(long id, String content) {
    this.id = id;
    this.content = content;
}

public long getId() {
    return id;
}

public String getContent() {
    return content;
}
}

REST响应方法：

@RequestMapping("/getlist")
public List<Greeting> getList(Model model) {
    List<Greeting> greetings = new ArrayList<>();
    greetings.add(new Greeting(1, "Something"));
    greetings.add(new Greeting(2, "Something"));
    greetings.add(new Greeting(3, "Something"));
    greetings.add(new Greeting(4, "Something"));
    return greetings;
}

我的请求方法：

public void restGet() {
    String url = "http://192.168.0.11:8080/greeting";
    RestTemplate restTemplate = new RestTemplate();
    restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter());

    ResponseEntity<Greeting[]> responseEntity = restTemplate.getForEntity(url, Greeting[].class);
    Greeting[] greeting = responseEntity.getBody();
    for (int i = 0; i < greeting.length; i++) {
        System.out.println("\n id: " + greeting[i].getId());
    }
}

这是JSON字符串：

[{"id":1,"content":"Something"},{"id":2,"content":"Something"},{"id":3,"content":"Something"},{"id":4,"content":"Something"}]

非常感谢任何帮助。谢谢！

Answer 1

我将URL更改为正确的URL，因为raiyan建议并且它现在正常工作。

Java Spring JSON解析转换为Java Array时出错

1 个答案: