The type com.fasterxml.jackson.core.JsonProcessingException异常解决
2017-08-23 14:59
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解决问题:The type com.fasterxml.jackson.core.JsonProcessingException异常解决
jackson系列jar包下载地址:http://download.csdn.net/download/hengji666/9946624,此资源中有4个关于jackson的包,建议导包的时候全部导入
在Stack Overflow看到的解决方法地址:https://stackoverflow.com/questions/25413842/the-type-com-fasterxml-jackson-core-jsongenerator-cannot-be-resolved-it-is-indi
上述代码在运行中可能会报错:
此时报错的原因:可参照此博客来。http://blog.csdn.net/jamesjxin/article/details/46606307
然后,在浏览的过程中发现,可能是由于自己少导包所致,于是将jackson的剩余annotation和jr-all包一起导入,然后重新运行,无误
项目导jar包可参照此博客:http://blog.csdn.net/mazhaojuan/article/details/21403717
package com.zyw; import java.io.IOException; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.List; import com.fasterxml.jackson.databind.ObjectMapper; /** * @ClassName:Json * @author zhangyanwei * @Description:json与Java互转 * @Date:2017年8月23号 */ public class Json { public static void main(String[] args) throws ParseException, IOException { User user = new User(); user.setName("小民"); user.setEmail("xiaomin@sina.com"); user.setAge(20); SimpleDateFormat dateformat = new SimpleDateFormat("yyyy-MM-dd"); user.setBirthday(dateformat.parse("1996-10-01")); /** * ObjectMapper是JSON操作的核心,Jackson的所有JSON操作都是在ObjectMapper中实现。 * ObjectMapper有多个JSON序列化的方法,可以把JSON字符串保存File、OutputStream等不同的介质中。 * writeValue(File arg0, Object arg1)把arg1转成json序列,并保存到arg0文件中。 * writeValue(OutputStream arg0, Object arg1)把arg1转成json序列,并保存到arg0输出流中。 * writeValueAsBytes(Object arg0)把arg0转成json序列,并把结果输出成字节数组。 * writeValueAsString(Object arg0)把arg0转成json序列,并把结果输出成字符串。 */ ObjectMapper mapper = new ObjectMapper(); //User类转JSON //输出结果:{"name":"小民","age":20,"birthday":844099200000,"email":"xiaomin@sina.com"} String json = mapper.writeValueAsString(user); System.out.println(json); //Java集合转JSON //输出结果:[{"name":"小民","age":20,"birthday":844099200000,"email":"xiaomin@sina.com"}] List<User> users = new ArrayList<User>(); users.add(user); String jsonlist = mapper.writeValueAsString(users); System.out.println(jsonlist); } }
mapper.writeValueAsString(user);这行代码报错:The type com.fasterxml.jackson.core.JsonProcessingException cannot be resolved. It is indirectly referenced from required .class files解决办法:导入jackson-core版本的jar包即可。
jackson系列jar包下载地址:http://download.csdn.net/download/hengji666/9946624,此资源中有4个关于jackson的包,建议导包的时候全部导入
在Stack Overflow看到的解决方法地址:https://stackoverflow.com/questions/25413842/the-type-com-fasterxml-jackson-core-jsongenerator-cannot-be-resolved-it-is-indi
上述代码在运行中可能会报错:
此时报错的原因:可参照此博客来。http://blog.csdn.net/jamesjxin/article/details/46606307
然后,在浏览的过程中发现,可能是由于自己少导包所致,于是将jackson的剩余annotation和jr-all包一起导入,然后重新运行,无误
项目导jar包可参照此博客:http://blog.csdn.net/mazhaojuan/article/details/21403717
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