json記點

jackson-all-1.9.0.jar

2.java2json
List<entity> list=null;
ObjectMapper mapper = new ObjectMapper();
mapper.writeValueAsString(list);
使用上述即可完成java到json的轉換，若想忽略entity的某些屬性值，只需在屬性聲明時加上@JsonIgnore


3.json2java
List<Entity>list=mapper.readValue(jsonStr,List.class);
Map m=mapper.readValue(jsonStr,Map.class);
Entity en=mapper.readValue(jsonStr,Entity.class)

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json-lib.2.4-jdk15.jar

1.2 java類2json
自定義processor處理類，並可通過style值返回不同的參數值
public class Advert implements java.io.Serializable {  
    private static final long serialVersionUID = -886134245592090495L;  

public class AdvertProcessor implements JsonBeanProcessor {  

使用方法:
JsonConfig config=new JsonConfig();  
           config.registerJsonBeanProcessor(Advert.class, new AdvertProcessor(1));  
           List<Advert>list=null;  
           JSONArray  ja=JSONArray.fromObject(list, config);  
           Advert advert=null;  
           JSONObject jo=JSONObject.fromObject(advert, config);  

1.3 json2java
針對 {“id”:"","url":"","width":"","height":""}

定義對應java類
public class JsonPosterVO {  
使用方法：
單個上述對象  
JSONObject jo=JSONObject .fromObject(jsonStr);  
JSONObject.toBean(programJsonObject, JsonPosterVO.class);  
[java] view plaincopy
json數組  
JsonArray ja=JsonArray.fromObject(jsonStr);  
JsonPosterVO[]  arr=(JsonPosterVO[])JSONArray.toArray(ja,JsonPosterVO.class)；  
  
List<JsonPosterVO>poster作爲一個對象的屬性  
Map<String, Class> mapClass = new HashMap<String, Class>();  
 mapClass.put("poster", JsonPosterVO.class);  
  JsonProgramVO[] array = (JsonProgramVO[])JSONArray.toArray(pArr, JsonProgramVO.class, mapClass);