google Gson 的用法

1 public class JsonTool {

private static Gson gson = null;

/**

* 创建谷歌json

* @return

*/

public static Gson createGson() {

if(gson == null)

{

GsonBuilder builder = new GsonBuilder();

builder.setDateFormat("yyyy-MM-dd HH:mm:ss"); //设置字符串的格式

builder.setPrettyPrinting();

builder.disableHtmlEscaping();

gson = builder.create();

}

return gson;

}

}

2 JsonTool.createGson().toJson(book)将对象转换成json

3 将json 转换成 model Book books =JsonTool.createGson().fromJson(JsonTool.createGson().toJson(book), Book.class);