java中用ObjectMapper类实现Json与bean的转换示例

前言

objectmapper是jackson中的方法，本文主要给大家介绍了关于java中用objectmapper类实现json与bean转换的相关内容，分享出来供大家参考学习，下面话不多说了，来一起看看详细的介绍吧。

一、将json字符串转为bean

public class jsontojavabean {
 public static void main(string[] args) {
  string str="{\"student\":[{\"name\":\"leilei\",\"age\":23},{\"name\":\"leilei02\",\"age\":23}]}";
  student stu = null;
  list list = null;
  try {
   objectmapper objectmapper=new objectmapper();
 studentlist studentlist=objectmapper.readvalue(str,studentlist.class);
   list=studentlist.getstudent();
  } catch (exception e) {
   // todo auto-generated catch block
   e.printstacktrace();
   } 
  for(student s:list){
   system.out.println(s.getname()+" "+s.getage());
  }
 }
}

或者

@controller
public class ordercontroller extends basecontroller {
 @autowired
 private objectmapper objectmapper1;
 @requestmapping(value = "/order/searchorderimportbyitem")
 public responsedata searchorderimportbyitem(@requestparam("page") integer page,
   @requestparam("pagesize") integer pagesize, httpservletrequest request) {
  try {
   string formdata = request.getparameter("formdata");
   orderqueryrequest orderqueryrequest = null;
   if (stringutils.isnotblank(formdata)) {
    objectmapper1.setdateformat(new simpledateformat("yyyy-mm-dd hh:mm"));
    orderqueryrequest = objectmapper1.readvalue(formdata, orderqueryrequest.class);
   } else {
    return null;
   }
   pagehelper.startpage(page, pagesize);
   list<orderqueryrequest> list = orderservice.searchorderimportbyitem(orderqueryrequest);
   return new responsedata(list);
  } catch (exception e) {
   e.printstacktrace();
  }
  return null;
 }
}

二、将bean转为json

public static void main(string[] args) {
  arraylist list=new arraylist();
  student s1=new student();
  s1.setname("leilei");
  s1.setage(23);
  student s2=new student();
  s2.setname("leilei02");
  s2.setage(23);
  list.add(s1);
  list.add(s2);  
  stringwriter str=new stringwriter();  
  objectmapper objectmapper=new objectmapper();
  try {
   objectmapper.writevalue(str, list);
  } catch (exception e) {
   // todo auto-generated catch block
   e.printstacktrace();
  } 
  system.out.println(str);
 }

总结

以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作能带来一定的帮助，如果有疑问大家可以留言交流，谢谢大家对的支持。