Question

我的以下设置工作正常，并且按预期打印了以下JSON：

{
  "status" : {
    "status" : "SUCCESS",
    "message" : "  "
  },
  "employeeStatus" : [ {
    "ID" : 81,
    "Name" : "Jack"
  }, {
    "ID" : 88,
    "Name" : "Anthony"
  } ]
}

以下代码可以正常工作，并且可以在JSON上方打印：

@RequestMapping(value="/get_employee_details", method=RequestMethod.GET)
    public String updateemployee()
    {  
       MyJSON myJSON = new MyJSON("SUCCESS", "  ");
       myJSON.addEmployeeStatus(81, "Jack");
       myJSON.addEmployeeStatus(88, "Anthony");
       return myJSON;
    }


public class MyJSON {
    private MyStatus status;
    private List<EmployeeStatus> employeeStatus = new ArrayList<>();
    public MyJSON(String status, String message) {
        this.status = new MyStatus(status, message);
    }
    public void addEmployeeStatus(int id, String name) {
        this.employeeStatus.add(new EmployeeStatus(id, name));
    }
    public MyStatus getStatus() {
        return this.status;
    }
    public List<EmployeeStatus> getEmployeeStatus() {
        return this.employeeStatus;
    }
}

public class MyStatus {
    private String status;
    private String message;
    public MyStatus(String status, String message) {
        this.status = status;
        this.message = message;
    }
    public String getStatus() {
        return this.status;
    }
    public String getMessage() {
        return this.message;
    }
}


public class EmployeeStatus {
    private int id;
    private String name;
    public EmployeeStatus(int id, String name) {
        this.id = id;
        this.name = name;
    }
    @JsonProperty("ID")
    public int getId() {
        return this.id;
    }
    @JsonProperty("Name")
    public String getName() {
        return this.name;
    }
}

但是我还涉及其他一些事情，例如Hibernate 4.3.5，从那里我可以获得一些细节，因此我对上述代码进行了如下修改：

 @RequestMapping(value="/get_employee_details", method=RequestMethod.GET)
    public String updateemployee
    (
    @RequestParam(value="emp_id", defaultValue="0") Integer emp_id
    ) 
    {
       EmployeeDao empDao = (EmployeeDao)context.getBean("empDao");
       List<Employee> empList = empDao.findByEmId(emp_id);

       MyJSON myJSON = new MyJSON("SUCCESS", "  ");
       myJSON.addEmployeeStatus(empList);
       return myJSON;
   }


 public class MyJSON {
    private MyStatus status;
    private List<EmployeeStatus> employeeStatus = new ArrayList<>();
    public MyJSON(String status, String message) {
        this.status = new MyStatus(status, message);
    }
    public void addEmployeeStatus(List<Employee> empList) {
        this.employeeStatus.add(new EmployeeStatus(empList));
    }

    public MyStatus getStatus() {
        return this.status;
    }
    public List<EmployeeStatus> getEmployeeStatus() {
        return this.employeeStatus;
    }
}


public class EmployeeStatus {
    private int id;
    private String name;
    private List<Employee> empList;


    public EmployeeStatus(List<Employee> empList) {
        this.empList = empList;
    }

    @JsonProperty("ID")
    public int getId() {
        return this.id;
    }
    @JsonProperty("Name")                                           
    public String getName() {
        return this.name;
    }
}

对于上述内容，我正在获取以下JSON响应：

{
    "status": {
        "status": "SUCCESS",
        "message": "  "
    },
    "employeeStatus": [
        {
            "ID": 0,
            "Name": null
        }
    ]
}

如果有人想知道empList的输出是什么。从控制器的以下代码行中，我尝试像这样打印它：

List<Employee> empList = empDao.findByEmId(emp_id);

logger.info("Employee List Check " + empList);

它正像这样打印：

Employee List Check [abc.cde.myproject.orm.Employee@599eeded,abc.cde.myproject.orm.Employee@75ffa715,abc.cde.myproject.orm.Employee@152beb23 ]

有人可以告诉我我在上面做什么吗？我的意思是如何使用上述代码中的empList打印JSON中的所有ID和名称？谢谢

Answer 1

使用jakson，flexjson等任何库将Employee List<Employee> empList的列表转换为JSON。

创建如下所示的方法。

public String toJsonArray(Collection<Employee> collection) {
  return new JSONSerializer().transform(new DateTransformer("MM/dd/yyyy HH:mm:ss"), java.util.Date.class).include("ID","Name").exclude("*").serialize(empList);
}

注意：在pom / gradle文件中添加flexjson依赖项，以便一旦添加依赖项。导入将如下所示。

import flexjson.JSONDeserializer;
import flexjson.JSONSerializer;
import flexjson.transformer.DateTransformer;

使用Spring和Hibernate 4.3.5无法正确打印JSON

1 个答案: