gson ajax 数字精度丢失问题的解决方法

/**   * 以Ajax方式输出常规操作结果   *   * @param status   *      返回状态，200表示成功, 500表示错误   * @param message   *      操作结果描述   * @param tag   *      附加数据   * @return   */  protected ActionResult ajaxResult(int status, final String message, Object tag) {    JsonObject json = new JsonObject();    json.addProperty("status", status);    json.addProperty("message", message);    String strJson = json.toString();    if (tag != null) {      StringBuffer sb = new StringBuffer();      sb.append(strJson.substring(0, strJson.length() - 1));      sb.append(",/"tag/":");      sb.append(GsonUtils.toJsonWithGson(tag));      sb.append("}");      strJson = sb.toString();    }    return writeJson(strJson);  }/**   * 向客户端输出文本信息   *   * @param message   * @return   */  protected ActionResult write(final String message) {    return new ActionResult() {      @Override      public void render(BeatContext arg0) throws Exception {        beat.getResponse().setCharacterEncoding("UTF-8");        beat.getResponse().setContentType("text/json;charset=UTF-8");        PrintWriter out = beat.getResponse().getWriter();        out.print(message);        out.close();      }    };  }  /**   * 向客户端输出文本信息   *   * @param message   * @return   */  protected ActionResult writeText(final String message) {    return new ActionResult() {      @Override      public void render(BeatContext arg0) throws Exception {        beat.getResponse().setCharacterEncoding("UTF-8");        beat.getResponse().setContentType("application/text");        PrintWriter out = beat.getResponse().getWriter();        out.print(message);        out.close();      }    };  }

package com.xxx.xxx.common.util.gson;import com.google.gson.*;import java.lang.reflect.Type;import java.util.ArrayList;import java.util.List;import java.util.Map;public class GsonUtils {  //private static Log logger = LogFactory.getLog(GsonUtils.class);  public static String toJsonWithGson(Object obj) {    Gson gson = createGson();  //new Gson();    return gson.toJson(obj);  }  public static String toJsonWithGson(Object obj, Type type) {    Gson gson = createGson();  //new Gson();    return gson.toJson(obj, type);  }  @SuppressWarnings("unchecked")  public static String toJsonWithGson(List list) {    Gson gson = createGson();  //new Gson();    return gson.toJson(list);  }  @SuppressWarnings("unchecked")  public static String toJsonWithGson(List list, Type type) {    Gson gson = createGson();  //new Gson();    return gson.toJson(list, type);  }  public static String toJsonWithGsonBuilder(Object obj) {    Gson gson = new GsonBuilder().setExclusionStrategies(new MyExclusionStrategy()).serializeNulls().create();    return gson.toJson(obj);  }  public static String toJsonWithGsonBuilder(Object obj, Type type) {    Gson gson = new GsonBuilder().setExclusionStrategies(new MyExclusionStrategy()).serializeNulls().create();    return gson.toJson(obj, type);  }  @SuppressWarnings("unchecked")  public static String toJsonWithGsonBuilder(List list) {    Gson gson = new GsonBuilder().setExclusionStrategies(new MyExclusionStrategy()).serializeNulls().create();    return gson.toJson(list);  }  @SuppressWarnings("unchecked")  public static String toJsonWithGsonBuilder(List list, Type type) {    Gson gson = new GsonBuilder().setExclusionStrategies(new MyExclusionStrategy()).serializeNulls().create();    return gson.toJson(list, type);  }  public static <T> Object fromJson(String json, Class<T> clazz) {    Object obj = null;    try {      Gson gson = new Gson();      obj = gson.fromJson(json, clazz);    } catch (Exception e) {      //logger.error("fromJson方法转换json串到实体类出错", e);    }    return obj;  }  /**   * 如果 Long 的数字超过15位，转换为String，在json中数字两边有引号   * @return   */  private static Gson createGson(){    GsonBuilder gsonBuilder = new GsonBuilder();    LongSerializer serializer = new LongSerializer();    gsonBuilder.registerTypeAdapter(Long.class, serializer);    gsonBuilder.registerTypeAdapter(long.class, serializer);    Gson gson = gsonBuilder.create();    return gson;  }  public static void main(String... args) throws Exception{//    long a = 12345678901234578L;////    GsonBuilder builder = new GsonBuilder();//    builder.registerTypeAdapter(Long.class, new LongSerializer());//    Gson gson2 = builder.create();//    System.out.println(gson2.toJson(a));////    Gson gson = new GsonBuilder().setExclusionStrategies(new MyExclusionStrategy()).serializeNulls().create();//    String str = gson.toJson(a);//    System.out.println(str);    TestVO vo = new TestVO();    vo.setId(618708732263538688L);    vo.setId2(918708732263538688L);    System.out.println(toJsonWithGson(vo));  }  static class LongSerializer implements JsonSerializer<Long> {    public JsonElement serialize(Long src, Type typeOfSrc, JsonSerializationContext context) {      if(src!=null){        String strSrc = src.toString();        if(strSrc.length()>15){          return new JsonPrimitive(strSrc);        }      }      return new JsonPrimitive(src);    }  }  static class TestVO {    public long getId() {      return id;    }    public void setId(long id) {      this.id = id;    }    private long id;    public Long getId2() {      return id2;    }    public void setId2(Long id2) {      this.id2 = id2;    }    private Long id2;  }}

package com.xxx.xxx.common.util.gson;import com.google.gson.ExclusionStrategy;import com.google.gson.FieldAttributes;public class MyExclusionStrategy implements ExclusionStrategy {    private final Class<?> typeToSkip;      public MyExclusionStrategy(){     this.typeToSkip=null;   }      public MyExclusionStrategy(Class<?> typeToSkip) {     this.typeToSkip = typeToSkip;   }      public boolean shouldSkipClass(Class<?> clazz) {     return (clazz == typeToSkip);   }    public boolean shouldSkipField(FieldAttributes f) {     return f.getAnnotation(NotSerialize.class) != null;   }  } 

package com.xxx.xxx.common.util.gson;import java.lang.annotation.ElementType;import java.lang.annotation.Retention;import java.lang.annotation.RetentionPolicy;import java.lang.annotation.Target;@Retention(RetentionPolicy.RUNTIME) @Target({ElementType.FIELD}) public @interface NotSerialize { }