jackson使用

1.  序列化

   1. ObjectMapper mapper = new ObjectMapper();//可以单例,线程安全
      Object result=new Object();
      mapper.writeValue(response.getWriter(), result);

       
2. 反序列化

   1. ObjectMapper mapper = new ObjectMapper();
      Module m=mapper.readValue("{text: \"查询统计\" }", Module.class);
      System.out.println(m);

       
3. 出现 org.codehaus.jackson.JsonParseException: Unexpected character 异常
   1. 属性名称没有用""括起来 ,需要加上配置  mapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);(org.codehaus.jackson.JsonParseException: Unexpected character (')
   2. 如果属性名是用''括起来就要加上 mapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
      (org.codehaus.jackson.JsonParseException: Unexpected character (''' )
   3. 如果抛出org.codehaus.jackson.map.exc.UnrecognizedPropertyException:错误,
      那么需要....配置.configure(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES , false);