通過InitBinder註解,做到全域性的格式化轉換

首先自定義一個格式轉換類(我們以Date格式為例)DateFormatEditor繼承自PropertiesEditor：

import java.text.ParseException;
import java.text.SimpleDateFormat;
import org.springframework.beans.propertyeditors.PropertiesEditor;
 
public class DateFormatEditor extends PropertiesEditor {
    // 日期是否允許為空
    private
 
 boolean isAllowEmpty;
    // 日期格式
    private String pattern;
 
    public DateFormatEditor() {
        super();
        this.isAllowEmpty = true;
        this.pattern = "yyyy-MM-dd";
    }
 
    public DateFormatEditor(String pattern, boolean isAllowEmpty) {
        super();
        this.isAllowEmpty = isAllowEmpty;
        
 
this.pattern = pattern;
    }
 
    public boolean isAllowEmpty() {
        return isAllowEmpty;
    }
 
    public void setAllowEmpty(boolean isAllowEmpty) {
        this.isAllowEmpty = isAllowEmpty;
    }
 
    public String getPattern() {
        return pattern;
    }
 
    public void setPattern(String pattern) {
        
 
this.pattern = pattern;
    }
 
    @Override
    public void setAsText(String text) throws IllegalArgumentException {
        try {
            if (text != null && !text.equals("")) {
                SimpleDateFormat format = new SimpleDateFormat(pattern);
                setValue(format.parse(text));
            } else {
                if (isAllowEmpty) {
                    setValue(null);
                }
            }
        } catch (ParseException e) {
            System.out.println("格式轉換失敗！");
            setValue(null);
        }
    }
}

定義完了還是不能用,這裡需要我們註冊：

由於需要全域性的格式化轉換所以我們定義一個BaseController類：

import java.util.Date;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.annotation.InitBinder;
import spring.util.DateFormatEditor;
 
@Controller
public class BaseController {
    @Autowired
    protected HttpServletRequest request;
    @Autowired
    protected HttpServletResponse response;
    @Autowired
    protected HttpSession session;
    @Autowired
    protected ServletContext application;
 
    @InitBinder
    protected void initDate(WebDataBinder binder) {
        binder.registerCustomEditor(Date.class, new DateFormatEditor("yyyy-MM-dd hh:mm:ss", true));
    }
}

首先自定義一個格式轉換類(我們以Date格式為例)DateFormatEditor繼承自PropertiesEditor：

1. import java.text.ParseException;
2. import java.text.SimpleDateFormat;
3. import org.springframework.beans.propertyeditors.PropertiesEditor;
5. public class DateFormatEditor extends PropertiesEditor {
6. // 日期是否允許為空
7. private boolean isAllowEmpty;
8. // 日期格式
9. private String pattern;
11. public DateFormatEditor() {
12. super();
13. this.isAllowEmpty = true;
14. this.pattern = "yyyy-MM-dd";
15. }
17. public DateFormatEditor(String pattern, boolean isAllowEmpty) {
18. super();
19. this.isAllowEmpty = isAllowEmpty;
20. this.pattern = pattern;
21. }
23. public boolean isAllowEmpty() {
24. return isAllowEmpty;
25. }
27. public void setAllowEmpty(boolean isAllowEmpty) {
28. this.isAllowEmpty = isAllowEmpty;
29. }
31. public String getPattern() {
32. return pattern;
33. }
35. public void setPattern(String pattern) {
36. this.pattern = pattern;
37. }
39. @Override
40. public void setAsText(String text) throws IllegalArgumentException {
41. try {
42. if (text != null && !text.equals("")) {
43. SimpleDateFormat format = new SimpleDateFormat(pattern);
44. setValue(format.parse(text));
45. } else {
46. if (isAllowEmpty) {
47. setValue(null);
48. }
49. }
50. } catch (ParseException e) {
51. System.out.println("格式轉換失敗！");
52. setValue(null);
53. }
54. }
55. }

定義完了還是不能用,這裡需要我們註冊：

由於需要全域性的格式化轉換所以我們定義一個BaseController類：

1. import java.util.Date;
2. import javax.servlet.ServletContext;
3. import javax.servlet.http.HttpServletRequest;
4. import javax.servlet.http.HttpServletResponse;
5. import javax.servlet.http.HttpSession;
6. import org.springframework.beans.factory.annotation.Autowired;
7. import org.springframework.stereotype.Controller;
8. import org.springframework.web.bind.WebDataBinder;
9. import org.springframework.web.bind.annotation.InitBinder;
10. import spring.util.DateFormatEditor;
12. @Controller
13. public class BaseController {
14. @Autowired
15. protected HttpServletRequest request;
16. @Autowired
17. protected HttpServletResponse response;
18. @Autowired
19. protected HttpSession session;
20. @Autowired
21. protected ServletContext application;
23. @InitBinder
24. protected void initDate(WebDataBinder binder) {
25. binder.registerCustomEditor(Date.class, new DateFormatEditor("yyyy-MM-dd hh:mm:ss", true));
26. }
27. }

這樣就把所有Date型別的引數全部攔截下來進行判斷和格式化。