struts2_自定义对象设置

在struts2里面对八种基本数据类型和Date类型有自动的转换功能，也可以自定义类型转换.

主要步骤如下：

1. 编写自定义类型的类(JavaBean).
2. 编写自定义类型转换器(继承StrutsTypeConverter类或者DefaultTypeConverter类)
3. 编写Action(继承ActionSupport类)
4. 在Action的同一目录下建立ActionName-conversion.properties(ActionName是Action的类名，conversion.properties是固定后缀)

结构：

 

用登陆功能来分析:

JavaBean:User.java

package com.sunflower.bean;

public class User {
    private String username;
    private String password;

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

}

类型转换器:UserConvert.java

package com.sunflower.util;

import java.util.Map;

import org.apache.struts2.util.StrutsTypeConverter;

import com.sunflower.bean.User;

/**
 * 自定义类型转换类
 * 
 * @author hanyuan
 * @time 2012-6-2 下午06:12:13
 */
public class UserConvert extends StrutsTypeConverter {

    /**
     * 将前台字符类型数据转换为自定义类型
     */
    public Object convertFromString(Map arg0, String[] arg1, Class arg2) {

        String userinfo = arg1[0];
        String username = userinfo.split(":")[0];
        String password = userinfo.split(":")[1];

        User user = new User();
        user.setUsername(username);
        user.setPassword(password);

        return user;
    }

    /**
     * 将后台自定义类型数据转换为前台字符类型
     */
    public String convertToString(Map arg0, Object arg1) {
        User user = (User) arg1;

        String userinfo = "";
        if (user.getUsername().equals("yuan") && user.getPassword().equals("123"))
            userinfo = user.getUsername();
        else
            userinfo = "username:" + user.getUsername() + " password:" + user.getPassword();
        return userinfo;
    }

}

Action:LoginAction.java

package com.sunflower.action;

import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionSupport;
import com.sunflower.bean.User;

/**
 * 校验用户信息的Action
 * 
 * @author hanyuan
 * @time 2012-6-2 下午05:08:54
 */
public class LoginAction extends ActionSupport {

    private User user;

    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }

    public String execute() throws Exception {
        // 判断用户名和密码是否正确
        if (user.getUsername().equals("yuan") && user.getPassword().equals("123"))
            return Action.SUCCESS;
        else
            return Action.ERROR;
    }
}

Properties:LoginAction-conversion.properties

user是要对其进行转换的数据对象，com.sunflower.util.UserConvert是对应的类型转换器

struts.xml中的配置:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
    "http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>
    <package name="struts2" extends="struts-default">
        <action name="logintest" class="com.sunflower.action.LoginAction">
            <result name="success">/login.jsp</result>
            <result name="error">/failed.jsp</result>
        </action>
    </package>

</struts>