Struts2类型转换

     假设有如下的输入界面：

    在上面输入abc,xyz模式的字符串，其中abc作为用户的用户名，xyz作为用户的密码，系统希望将上边的字符串转换成一个User实例。

     1、LoginAction.java

  1: package cc.openhome;

  2: import com.opensymphony.xwork2.Action;

  3: import com.opensymphony.xwork2.ActionSupport;

  4: public class LoginAction extends ActionSupport implements Action {

  5:   private User user;

  6:   private String tip;

  7:   

  8:   public User getUser() {

  9:     return user;

 10:   }

 11: 

 12:   public void setUser(User user) {

 13:     this.user = user;

 14:   }

 15: 

 16:   public String getTip() {

 17:     return tip;

 18:   }

 19: 

 20:   public void setTip(String tip) {

 21:     this.tip = tip;

 22:   }

 23: 

 24:   public String execute() throws Exception {

 25:     // TODO Auto-generated method stub

 26:     if(getUser().getName().equals("nihao") && getUser().getPass().equals("ni")){

 27:       setTip("转换成功");

 28:       return SUCCESS;

 29:     }else{

 30:       System.out.println("失败！");

 31:       setTip("失败成功");

 32:       return ERROR;

 33:     }

 34:   }

 35: }

    2、User.java

  1: package cc.openhome;

  2: public class User {

  3:   private String name;

  4:   private String pass;

  5:   public String getName() {

  6:     return name;

  7:   }

  8:   public void setName(String name) {

  9:     this.name = name;

 10:   }

 11:   public String getPass() {

 12:     return pass;

 13:   }

 14:   public void setPass(String pass) {

 15:     this.pass = pass;

 16:   }

 17: }

    3、实现类型转换器UserConverter.java

  1: package cc.openhome;

  2: import java.util.Map;

  3: import ognl.DefaultTypeConverter;

  4: public class UserConverter extends DefaultTypeConverter {  

  5:   //类型转换器必须重写convertValue的方法，该方法需要完成双向转换。

  6:   public Object convertFormString(Map context, String[] values, Class toType ){

  7:     System.out.println("此方法执行了、、、、、、");

  8:     //将需要将字符串向User类型转换时  

  9:     User user=new User();

 10:     String[] userValue= values[0].split(",");

 11:     user.setName(userValue[0]);

 12:     user.setPass(userValue[1]);

 13:     return user;  

 14:   }

 15:   public String convertToString(Map context, Object o){

 16:     User user=(User) o;

 17:     return "<"+user.getName()+","+user.getPass()+">";

 18:   }

 19: 

 20: }

 21: 

    4、定义一个局部类型转换器

        建立一个文件LoginAction-conversion.properties，该文件由key-value对组成。

  1: user=cc.openhome.UserConverter

    5、运行结果

    6、全局类型转换器

        假如输入页面变为如下：用户信息和客人信息要转换成User类型，生日参数要转换成Date类型。

     更新后的LoginAction.java

  1: package cc.openhome;

  2: 

  3: import java.util.Date;

  4: 

  5: import com.opensymphony.xwork2.Action;

  6: import com.opensymphony.xwork2.ActionSupport;

  7: public class LoginAction extends ActionSupport implements Action {

  8:   private User user;

  9:   private String tip;

 10:   private User customer;

 11:   private Date birth;  

 12:   public User getCustomer() {

 13:     return customer;

 14:   }

 15:   public void setCustomer(User customer) {

 16:     this.customer = customer;

 17:   }

 18:   public Date getBirth() {

 19:     return birth;

 20:   }

 21:   public void setBirth(Date birth) {

 22:     this.birth = birth;

 23:   }

 24:   public User getUser() {

 25:     return user;

 26:   }

 27:   public void setUser(User user) {

 28:     this.user = user;

 29:   }

 30:   public String getTip() {

 31:     return tip;

 32:   }

 33:   public void setTip(String tip) {

 34:     this.tip = tip;

 35:   }

 36:   public String execute() throws Exception {

 37:     // TODO Auto-generated method stub    

 38:     if(getUser().getName().equals("nihao") && getUser().getPass().equals("ni")){

 39:       setTip("转换成功");

 40:       return SUCCESS;

 41:     }else{

 42:       setTip("失败成功");

 43:       return ERROR;

 44:     }

 45:   }

 46: }

    7、提供全局转换器文件

    xwork-conversion.properties

  1: cc.openhome.User=cc.openhome.UserConverter

    8、运行结果

        用户信息框输入scott，tiger ，客人信息输入框输入”abc,xyz”，在生日框中输入”2003-02-12”,则