如何自动格式化列表中的所有 bigdecimal 字段<object>带 spring 启动<div id="text_translate"><p>我的 Rest Api （由 Spring 引导）需要自动转换 ZA8Z6FDE6331BD59EB66AC 列表中的 BigDecimal 字段。</p><p> 前任：</p><pre> class EmployeeDTO { private String name; private BigDecimal salary; // 12345 --&gt; need to 12,345 } @PostMapping(path = "/get-list-employee") public ResponseEntity&lt;Object&gt; searchListEmployee(@RequestBody EmployeeDTO employeeDTO) throws JSONException { return new ResponseEntity&lt;Object&gt;(employeeService.searchListEmployee(employeeDTO).getBody(), HttpStatus.OK); }</pre><p> 并且需要每个员工有薪水的返回列表已经格式化。</p><p> 我找到了一些格式化方式，比如使用 PropertyEditorRegistrar 或 CustomNumberFormat，...</p><p> 但似乎，它不支持列表 object。</p><p> 有人告诉我如何格式化 object 列表中的所有 bigdecimal 字段吗？</p></div></object>

Question

My Rest Api (by Spring boot) need automatic convert BigDecimal fields in list of object with thousand format.

Ex:

class EmployeeDTO {
     private String name;

     private BigDecimal salary; // 12345 --> need to 12,345
 }

@PostMapping(path = "/get-list-employee")
public ResponseEntity<Object> searchListEmployee(@RequestBody EmployeeDTO employeeDTO)
        throws JSONException {
    return new ResponseEntity<Object>(employeeService
            .searchListEmployee(employeeDTO).getBody(),
            HttpStatus.OK);
}

and need return List which each Employee has salary has formatted.

I found some format ways, such as using PropertyEditorRegistrar or CustomNumberFormat, ...

but seem, it not support for list object.

Anyone show me how to format all bigdecimal fields in a list of object?

Answer 1

You can change the getter of the salary in EmployeeDTO to return a formatted value. Like this:

public String getSalary() {
    return NumberFormat.getCurrencyInstance().format(salary);
}

This will return a formatted value according to JVM's current default Locale like this: $12,345.00

You can also change this if you provide a custom formatter. Like this:

public String getSalary() {
    DecimalFormat df = new DecimalFormat("#,###.00");
    return df.format(salary);
}

It will return a formatted value like this: 12,345.00 .

Here is how I have tested it out:

List<EmployeeDTO> employees = new ArrayList<>();
employees.add(new EmployeeDTO("Emp1", BigDecimal.valueOf(12345)));
employees.add(new EmployeeDTO("Emp2", BigDecimal.valueOf(22134)));
employees.add(new EmployeeDTO("Emp3", BigDecimal.valueOf(44233)));

System.out.println(new ObjectMapper().writeValueAsString(employees)); // printing JSON

Output:

[
  {
    "name": "Emp1",
    "salary": "$12,345.00"
  },
  {
    "name": "Emp2",
    "salary": "$22,134.00"
  },
  {
    "name": "Emp3",
    "salary": "$44,233.00"
  }
]