/* * 第一种:在对象响应字段前加注解 * @JSONField(serialize=false) * private String name; */
/* * 第二种:在对象对应字段前面加transient,表示该字段不用序列化 * private transient String name; */
/* * 第三种 * PropertyFilter profilter = new PropertyFilter(){ @Override public boolean apply(Object object, String name, Object value) { if(name.equalsIgnoreCase("last")){ //false表示last字段将被排除在外 return false; } return true; } }; json = JSON.toJSONString(user, profilter); System.out.println(json); */
/* * 第四种,直接填写属性 * SimplePropertyPreFilter filter = new SimplePropertyPreFilter(TTown.class, "id","townname"); response.getWriter().write(JSONObject.toJSONString(townList,filter)); */
//第五种:深层次过滤 (限高版本) //TTown1对象中有属性名称为TTown2对象,只需要TTown1的id属性包括TTown2对象的id属性 SimplePropertyPreFilter filter1 = new SimplePropertyPreFilter(TTown1.class, "id","townname"); SimplePropertyPreFilter filter2 = new SimplePropertyPreFilter(TTown2.class, "id","townname"); SerializeFilter[] filters=new SerializeFilter[]{filter1,filter2}; System.out.println(JSONObject.toJSONString(result, filters));
//第六种:深层次过滤,实现PropertyPreFilter public class ComplexPropertyPreFilter implements PropertyPreFilter { private Map<Class<?>, String[]> includes = new HashMap<Class<?>, String[]>(); private Map<Class<?>, String[]> excludes = new HashMap<Class<?>, String[]>(); static { JSON.DEFAULT_GENERATE_FEATURE |= SerializerFeature.DisableCircularReferenceDetect.getMask(); } public ComplexPropertyPreFilter() { } public ComplexPropertyPreFilter(Map<Class<?>, String[]> includes) { super(); this.includes = includes; } @Override public boolean apply(JSONSerializer serializer, Object source, String name) { //对象为空。直接放行 if (source == null) { return true; } // 获取当前需要序列化的对象的类对象 Class<?> clazz = source.getClass(); // 无需序列的对象、寻找需要过滤的对象,可以提高查找层级 // 找到不需要的序列化的类型 for (Map.Entry<Class<?>, String[]> item : this.excludes.entrySet()) { // isAssignableFrom(),用来判断类型间是否有继承关系 if (item.getKey().isAssignableFrom(clazz)) { String[] strs = item.getValue(); // 该类型下 此 name 值无需序列化 if (isHave(strs, name)) { return false; } } } // 需要序列的对象集合为空 表示 全部需要序列化 if (this.includes.isEmpty()) { return true; } // 需要序列的对象 // 找到不需要的序列化的类型 for (Map.Entry<Class<?>, String[]> item : this.includes.entrySet()) { // isAssignableFrom(),用来判断类型间是否有继承关系 if (item.getKey().isAssignableFrom(clazz)) { String[] strs = item.getValue(); // 该类型下 此 name 值无需序列化 if (isHave(strs, name)) { return true; } } } return false; } /* * 此方法有两个参数,第一个是要查找的字符串数组,第二个是要查找的字符或字符串 */ public static boolean isHave(String[] strs, String s) { for (String str : strs) { // 循环查找字符串数组中的每个字符串中是否包含所有查找的内容 if (str.equals(s)) { // 查找到了就返回真,不在继续查询 return true; } } // 没找到返回false return false; } public Map<Class<?>, String[]> getIncludes() { return includes; } public void setIncludes(Map<Class<?>, String[]> includes) { this.includes = includes; } public Map<Class<?>, String[]> getExcludes() { return excludes; } public void setExcludes(Map<Class<?>, String[]> excludes) { this.excludes = excludes; } }