提供json與對象之間的基本轉換
public class JsonUtil {
/**
* 將對象轉換爲json字符串
*
* @param obj
* @return
* @throws Exception
*/
public static String obj2string(Object obj) {
StringWriter sw = new StringWriter();
ObjectMapper mapper = new ObjectMapper();
try {
mapper.writeValue(sw, obj);
} catch (Exception e) {
}
return sw.toString();
}
/**
* 將字符串轉list對象
*
* @param <T>
* @param jsonStr
* @param cls
* @return
*/
public static <T> List<T> str2list(String jsonStr, Class<T> cls) {
ObjectMapper mapper = new ObjectMapper();
List<T> objList = null;
try {
JavaType t = mapper.getTypeFactory().constructParametricType(
List.class, cls);
objList = mapper.readValue(jsonStr, t);
} catch (Exception e) {
}
return objList;
}
/**
* 將字符串轉爲對象
*
* @param <T>
* @param jsonStr
* @param cls
* @return
*/
public static <T> T str2obj(String jsonStr, Class<T> cls) {
ObjectMapper mapper = new ObjectMapper();
T obj = null;
try {
obj = mapper.readValue(jsonStr, cls);
} catch (Exception e) {
}
return obj;
}
/**
* 將字符串轉爲Page對象
*
* @param <T>
* @param jsonStr
* @param cls
* @return
*/
public static <T> Page<T> str2page(String jsonStr, Class<T> cls) {
ObjectMapper mapper = new ObjectMapper();
Page<T> objList = null;
try {
JavaType t = mapper.getTypeFactory().constructParametricType(
Page.class, cls);
objList = mapper.readValue(jsonStr, t);
} catch (Exception e) {
}
return objList;
}
/**
* 將字符串轉爲json節點
* @param jsonStr
* @return
*/
public static JsonNode str2node(String jsonStr) {
ObjectMapper mapper = new ObjectMapper();
try {
return mapper.readTree(jsonStr);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}使用方式：
public static void main(String[] args) {
List<TestObj> list = new ArrayList<TestObj>();
String listStr = JsonUtil.obj2string(list);
list = JsonUtil.str2list(listStr, TestObj.class);
}下面代碼因爲博客原因不能刪除，不可用
