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struts2--自定义数组属性类型转换器（一定要理解对象数组的概念！）

2017-08-07 08:33 489 查看

实现如下：

1、index.jsp:

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib prefix = "s" uri = "/struts-tags"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>

<body>
<s:form action = "login" method = "get">
<s:textfield name = "user" label = "用户名及密码1"></s:textfield>
<s:textfield name = "user" label = "用户名及密码2"></s:textfield>
<s:textfield name = "user" label = "用户名及密码3"></s:textfield>
<s:submit value = "提交"></s:submit>
</s:form>
</body>
</html>

javabean:

package com.action;

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

public class LoginAction extends ActionSupport{
private User[] user;

public String execute() {
return SUCCESS;
}

public User[] getUser() {
return user;
}

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

}

LoginAction.java

package com.action;

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

public class LoginAction extends ActionSupport{
private User[] user;

public String execute() {
return SUCCESS;
}

public User[] getUser() {
return user;
}

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

}

类型转换器：

package com.converter;

import java.util.Map;

import org.apache.struts2.util.StrutsTypeConverter;

import com.bean.User;
import com.opensymphony.xwork2.conversion.impl.DefaultTypeConverter;

public class UserConverter extends StrutsTypeConverter{

@Override
public Object convertFromString(Map context, String[] values, Class toClass) {
User[] users = new User[values.length];
for (int i = 0; i < values.length; i++) {
String[] userValue = values[i].split(",");
users[i] = new User();  //必须new对象！
users[i].setUsername(userValue[0]);
users[i].setPassword(userValue[1]);
}
return users;
}

@Override
public String convertToString(Map context, Object values) {
if(values instanceof User[]){
User[] users = (User[])values;
String reStr = "";
for (int i = 0; i < users.length; i++) {
reStr += "用户名："+users[i].getUsername()+" 密码："+users[i].getPassword()+"\n";
}
return reStr;
}
else return null;
}

}

LoginAction-conversion.properties文件：

user=com.converter.UserConverter

ok.jsp页面：

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib prefix = "s" uri = "/struts-tags" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'ok.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->

</head>

<body>
<s:debug/>
<s:property value = "user"/>
</body>
</html>

深刻反思！

很简单的类型转换却找了很久的bug！究其原因出在了对象数组身上。

二：集合类型转换器

package com.converter;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

impor
e4ff
t org.apache.struts2.util.StrutsTypeConverter;

import com.bean.User;
import com.opensymphony.xwork2.conversion.impl.DefaultTypeConverter;

public class UserConverter extends StrutsTypeConverter{

@Override
public Object convertFromString(Map context, String[] values, Class toClass) {
List<User> users = new ArrayList<User>();
for (int i = 0; i < values.length; i++) {
String[] userValue = values[i].split(",");
User user = new User();
user.setUsername(userValue[0]);
user.setPassword(userValue[1]);
users.add(user);
}
return users;
}

@Override
public String convertToString(Map context, Object values) {
if(values instanceof List){
List<User> users = (List<User>)values;
String reStr = "";
for (int i = 0; i < users.size(); i++) {
reStr += "用户名："+users.get(i).getUsername()+" 密码："+users.get(i).getPassword()+"\n";
}
return reStr;
}
else return null;
}

}

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