Struts2的型別轉換器不起作用
阿新 • • 發佈：2018-12-12
看了書上關於struts2的型別轉換器後覺得挺明白，結果一試一大堆bug。發現使用模型驅動時區域性配置一直不起作用，先貼程式碼：
登錄檔單：
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> </head> <body> <form action="${pageContext.request.contextPath}/convert" method="post"> 使用者名稱：<input type="text" name="username"/><br/> 密碼：<input type="password" name="password"/><br/> 生日：<input type="text" name="birthday"/><br/> <input type="submit" value="submit"/> </form> </body> </html>
動作類：
package com.hncj.convert; import java.util.Date; import com.opensymphony.xwork2.ActionSupport; public class UserAction extends ActionSupport{ private Date birthday; private String password; private String username; //這裡將屬性直接寫入action public Date getBirthday() { return birthday; } public String getPassword() { return password; } public String getUsername() { return username; } public void setBirthday(Date birthday) { this.birthday = birthday; } public void setPassword(String password) { this.password = password; } public void setUsername(String username) { this.username = username; } public String doUser() { System.out.println(this.getBirthday()); System.out.println(this.username); System.out.println(this.password); return "success"; } }
轉換類：
package com.hncj.convert; import java.text.DateFormat; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Map; import org.apache.struts2.util.StrutsTypeConverter; public class DateConverter extends StrutsTypeConverter{ private DateFormat[] formats = new SimpleDateFormat[] { new SimpleDateFormat("yyyy-MM-dd"), new SimpleDateFormat("yyyy/MM/dd"), new SimpleDateFormat("yyyy.MM.dd"), new SimpleDateFormat("yyyy_MM_dd") }; @Override public Object convertFromString(Map context, String[] values, Class toClass) { String date = values[0]; for(int i = 0 ; i < formats.length ; i++) { try { return formats[i].parse(date); } catch (ParseException e) { continue; } } return null; } @Override public String convertToString(Map context, Object o) { return new SimpleDateFormat("yyyy-MM-dd").format(o); } }
struts.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
"http://struts.apache.org/dtds/struts-2.5.dtd">
<struts>
<constant name="struts.devMode" value="true"/>
<constant name="struts.enable.DynamicMethodInvocation" value="true"/>
<package name="myPack" extends="struts-default">
<global-results>
<result name="input">/error.jsp</result>
</global-results>
<action name="convert" class="com.hncj.convert.UserAction" method="doUser">
<result>/success.jsp</result>
</action>
</package>
</struts>轉換器配置方法有兩種：一、區域性配置 二、全域性配置
一、區域性配置檔案 UserAction-conversion.properties
birthday=com.hncj.convert.DateConverter二、全域性配置檔案 xwork-conversion.properties
java.util.Date=com.hncj.convert.DateConverter這種方式將屬性直接寫入action類中的方法，兩種配置都沒有問題。但使用模型驅動，將物件作為屬性放入action中時，區域性配置不起效果，很是鬱悶，無奈只好改成全域性配置，下面是程式碼，有沒有大神幫忙看一下？
其他頁面不變，action頁面如下：
package com.hncj.edu;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
public class TestAction extends ActionSupport implements ModelDriven<User>{
private User user = new User();
public String execute() throws Exception {
System.out.println(user.getBirthday());
return SUCCESS;
}
@Override
public User getModel() {
return user;
}
}
User實體類：
package com.hncj.edu;
import java.util.Date;
public class User {
private String username;
private String password;
private Date birthday;
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;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
}
無論區域性配置是這樣(TestAction-conversion.properties)：
birthday=com.hncj.edu.MyTypeConverter還是這樣:
user.birthday=com.hncj.edu.MyTypeConverter都不起作用,有沒有大佬解答一下？當然，全域性配置還是可以的。
後來又這樣試了一下，直接用模型傳值：
登錄檔單：
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="test" method="post">
<table>
<tr>
<td>姓名：</td>
<td><input type="text" name="user.username"></td>
</tr>
<tr>
<td>密碼：</td>
<td><input type="password" name="user.password"></td>
</tr>
<tr>
<td>生日：</td>
<td><input type="text" name="user.birthday"></td>
</tr>
<tr>
<td></td>
<td><input type="submit" value="提交"></td>
</tr>
</table>
</form>
</body>
</html>動作類：
package com.hncj.edu;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
public class TestAction extends ActionSupport{
private User user;
public String execute() throws Exception {
System.out.println(user.getBirthday());
return SUCCESS;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
}
成功檢視：
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<s:property value="user.birthday"/>//這裡可以呼叫convertToString方法
<s:debug></s:debug>
successfully
</body>
</html>struts.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
"http://struts.apache.org/dtds/struts-2.5.dtd">
<struts>
<constant name="struts.devMode" value="true"/>
<package name="default" extends="struts-default">
<action name="test" class="com.hncj.edu.TestAction">
<result>success.jsp</result>
<result name="input">index.jsp</result>
</action>
</package>
</struts>區域性配置：TestAction-conversion.properties
user.birthday=com.hncj.edu.MyTypeConverter全域性配置：xwork-conversion.properties
java.util.Date=com.hncj.edu.MyTypeConverter兩種都能起作用。
還有一個問題就是輸出型別轉換的屬性時，覆寫的StrutsTypeConverter方法中提供的convertToString一直未呼叫，後來發現在使用<s:property value="xx"/>標籤向頁面輸出時才呼叫了這個方法。