java中用ObjectMapper类实现Json与bean的转换示例_Java教程

java中用ObjectMapper类实现Json与bean的转换示例

2020-12-19 13:59cc_yy_zh Java教程

这篇文章主要给大家介绍了关于在java中用ObjectMapper类实现Json与bean转换的相关资料，文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值，需要的朋友们下面跟着小编来一起学习学习吧。

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);

									 }