Go语言视频零基础入门到精通

javalearner

本例讲述将表单中的字符串转换为Point类：
1，新建Point类：

2. package com.test.bean;
3. public class Point {
4. private int x;
5. private int y;
7. public int getX() {
8.   return x;
9. }
10. public void setX(int x) {
11.   this.x = x;
12. }
13. public int getY() {
14.   return y;
15. }
16. public void setY(int y) {
17.   this.y = y;
18. }
19. }

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2，新建转换类：

3. package com.test.converter;
4. import java.util.Map;
5. import com.test.bean.Point;
6. import ognl.DefaultTypeConverter;
7. public class PointConverter extends DefaultTypeConverter {
8. @Override
9. public Object convertValue(Map context, Object value, Class toType) {
10.   if(Point.class == toType){
11.    String[] str = (String[])value;
12.    
13.    String[] strParameters = str[0].split(",");
14.    
15.    Point point = new Point();
16.    
17.    int x = Integer.parseInt(strParameters[0]);
18.    int y = Integer.parseInt(strParameters[1]);
19.    
20.    point.setX(x);
21.    point.setY(y);
22.    
23.    return point;
24.   }
25.    
26.   if(String.class == toType){
27.    
28.    Point point = (Point)value;
29.    
30.    int x = point.getX();
31.    int y = point.getY();
32.    
33.    String result = "[x="+x+",y="+y+"]";
34.    
35.    return result;
36.   }
37.    
38.   return null;
39. }
40. }

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3，新建Action类继承ActionSupport类：

2. package com.test;
3. import java.util.Date;
4. import com.opensymphony.xwork2.ActionSupport;
5. import com.test.bean.Point;
6. public class PointAction extends ActionSupport {
7. private Point point;
8. private int age;
9. private String username;
10. private Date birthday;
11. public int getAge() {
12.   return age;
13. }
14. public void setAge(int age) {
15.   this.age = age;
16. }
17. public Date getBirthday() {
18.   return birthday;
19. }
20. public void setBirthday(Date birthday) {
21.   this.birthday = birthday;
22. }
23. public Point getPoint() {
24.   return point;
25. }
26. public void setPoint(Point point) {
27.   this.point = point;
28. }
29. public String getUsername() {
30.   return username;
31. }
32. public void setUsername(String username) {
33.   this.username = username;
34. }
36. @Override
37. public String execute() throws Exception {
38.   return SUCCESS;
39. }
43. }

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4，在struts.xml中配置action：

2.       <action name="pointConverter" class="com.test.PointAction">
3.         <result name="success">/output.jsp</result>
4.       </action>

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5，新建资源文件：PointAction-conversion.properties（前缀为action的名字后缀都是-conversion.properties）：

2. point=com.test.converter.PointConverter

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6，输入页面：input.jsp和结果页面：output.jsp：
input.jsp

2.    <s:form action="pointConverter">
3.      <s:textfield name="point" label="point"></s:textfield>
4.      <s:textfield name="age" label="age"></s:textfield>
5.      <s:textfield name="username" label="username"></s:textfield>
6.      <s:textfield name="birthday" label="birthday"></s:textfield>
7.      <s:submit label="submit"></s:submit>
8.    </s:form>

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output.jsp

2.   point:<s:property value="point"/><br/>
3.   age:<s:property value="age"/><br/>
4.   username:<s:property value="username"/><br/>
5.   birthday:<s:property value="birthday"/><br/>

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显示结果：

lwenw22

很好的例子。