Json在android中使用restTemplate解析（BEGIN_ARRAY，但是BEGIN_OBJECT）

Question

我使用android rest模板解析我的android項目中的json服務。 當我嘗試解析json我有一些錯誤。

錯誤：

**org.springframework.http.converter.HttpMessageNotReadableExeption: 
Could not read JSON:java.lang.IllegalStateExeption: 
Exepted BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2; 
nested exception in com.google.gson.JsonSyntaxException:java** 

.......等

這裏是我的JSON：

{ 
    "kategorijaartikla": [ 
     { 
      "id": "1", 
      "kategorija": "kategorija1" 
     }, 
     { 
      "id": "2", 
      "kategorija": "kategorija2" 
     } 
    ] 
} 

這裏是我的RestTemplate代碼：

String url = "http://tomcat.fit.ba/asdf/rest/GetAllKategorije"; 
    HttpHeaders requestHeaders = new HttpHeaders(); 
    requestHeaders.setAccept(Collections.singletonList(new MediaType("application","json"))); 

    HttpEntity<?> requestEntity = new HttpEntity<Object>(requestHeaders);  
    GsonHttpMessageConverter messageConverter = new GsonHttpMessageConverter(); 
    List<HttpMessageConverter<?>> messageConverters = new ArrayList<HttpMessageConverter<?>>(); 

    messageConverters.add(messageConverter); 
    RestTemplate restTemplate = new RestTemplate(); 

    restTemplate.getMessageConverters().add(messageConverter); 
    restTemplate.getMessageConverters().add(new org.springframework.http.converter.json.GsonHttpMessageConverter()); 

    ResponseEntity<kategorijaartikla[]> responseEntity = restTemplate.exchange(url, HttpMethod.GET, requestEntity, kategorijaartikla[].class); 
    kategorijaartikla[] events = responseEntity.getBody(); 

kategorijaartikla.java

public class kategorijaartikla {

private Integer id; private String kategorija;

public kategorijaartikla() { }

public Integer getId() { return id; } public void setId(Integer newId) { this.id = newId; }

public String getKategorija() { return kategorija; }

public void setKategorija(String newKategorija) { this.kategorija = newKategorija; }

logcat的：

12-07 02:55:21.123: E/Trace(1043): error opening trace file: No such file or directory (2) 
12-07 02:55:22.693: D/libEGL(1043): loaded /system/lib/egl/libEGL_emulation.so 
12-07 02:55:22.702: D/(1043): HostConnection::get() New Host Connection established 0x2a0d9c80, tid 1043 
12-07 02:55:22.723: D/libEGL(1043): loaded /system/lib/egl/libGLESv1_CM_emulation.so 
12-07 02:55:22.754: D/libEGL(1043): loaded /system/lib/egl/libGLESv2_emulation.so 
12-07 02:55:22.903: W/EGL_emulation(1043): eglSurfaceAttrib not implemented 
12-07 02:55:22.963: D/OpenGLRenderer(1043): Enabling debug mode 0 
12-07 02:55:23.363: D/dalvikvm(1043): GC_CONCURRENT freed 231K, 6% free 6196K/6535K, paused 76ms+41ms, total 284ms 
12-07 02:57:16.873: W/EGL_emulation(1043): eglSurfaceAttrib not implemented 12-07 02:57:20.872: D/dalvikvm(1043): null clazz in OP_INSTANCE_OF, single-stepping 

Answer 1

試試這個， 所以你的結果是一個數組，而不是一個JSON對象。

[ 
    { 
     "id": "1", 
     "kategorija": "kategorija1" 
    }, 
    { 
     "id": "2", 
     "kategorija": "kategorija2" 
    } 
] 

這樣你就會收到一個json對象數組，而不是一個帶數組的json對象。